1// Components for manipulating sequences of characters -*- C++ -*-
2
3// Copyright (C) 1997-2015 Free Software Foundation, Inc.
4//
5// This file is part of the GNU ISO C++ Library. This library is free
6// software; you can redistribute it and/or modify it under the
7// terms of the GNU General Public License as published by the
8// Free Software Foundation; either version 3, or (at your option)
9// any later version.
10
11// This library is distributed in the hope that it will be useful,
12// but WITHOUT ANY WARRANTY; without even the implied warranty of
13// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14// GNU General Public License for more details.
15
16// Under Section 7 of GPL version 3, you are granted additional
17// permissions described in the GCC Runtime Library Exception, version
18// 3.1, as published by the Free Software Foundation.
19
20// You should have received a copy of the GNU General Public License and
21// a copy of the GCC Runtime Library Exception along with this program;
22// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
23// <http://www.gnu.org/licenses/>.
24
25/** @file bits/basic_string.h
26 * This is an internal header file, included by other library headers.
27 * Do not attempt to use it directly. @headername{string}
28 */
29
30//
31// ISO C++ 14882: 21 Strings library
32//
33
34#ifndef _BASIC_STRING_H
35#define _BASIC_STRING_H 1
36
37#pragma GCC system_header
38
39#include <ext/atomicity.h>
40#include <ext/alloc_traits.h>
41#include <debug/debug.h>
42#if __cplusplus >= 201103L
43#include <initializer_list>
44#endif
45
46namespace std _GLIBCXX_VISIBILITY(default)
47{
48_GLIBCXX_BEGIN_NAMESPACE_VERSION
49
50#if _GLIBCXX_USE_CXX11_ABI
51_GLIBCXX_BEGIN_NAMESPACE_CXX11
52 /**
53 * @class basic_string basic_string.h <string>
54 * @brief Managing sequences of characters and character-like objects.
55 *
56 * @ingroup strings
57 * @ingroup sequences
58 *
59 * @tparam _CharT Type of character
60 * @tparam _Traits Traits for character type, defaults to
61 * char_traits<_CharT>.
62 * @tparam _Alloc Allocator type, defaults to allocator<_CharT>.
63 *
64 * Meets the requirements of a <a href="tables.html#65">container</a>, a
65 * <a href="tables.html#66">reversible container</a>, and a
66 * <a href="tables.html#67">sequence</a>. Of the
67 * <a href="tables.html#68">optional sequence requirements</a>, only
68 * @c push_back, @c at, and @c %array access are supported.
69 */
70 template<typename _CharT, typename _Traits, typename _Alloc>
71 class basic_string
72 {
73 typedef typename __gnu_cxx::__alloc_traits<_Alloc>::template
74 rebind<_CharT>::other _Char_alloc_type;
75 typedef __gnu_cxx::__alloc_traits<_Char_alloc_type> _Alloc_traits;
76
77 // Types:
78 public:
79 typedef _Traits traits_type;
80 typedef typename _Traits::char_type value_type;
81 typedef _Char_alloc_type allocator_type;
82 typedef typename _Alloc_traits::size_type size_type;
83 typedef typename _Alloc_traits::difference_type difference_type;
84 typedef typename _Alloc_traits::reference reference;
85 typedef typename _Alloc_traits::const_reference const_reference;
86 typedef typename _Alloc_traits::pointer pointer;
87 typedef typename _Alloc_traits::const_pointer const_pointer;
88 typedef __gnu_cxx::__normal_iterator<pointer, basic_string> iterator;
89 typedef __gnu_cxx::__normal_iterator<const_pointer, basic_string>
90 const_iterator;
91 typedef std::reverse_iterator<const_iterator> const_reverse_iterator;
92 typedef std::reverse_iterator<iterator> reverse_iterator;
93
94 /// Value returned by various member functions when they fail.
95 static const size_type npos = static_cast<size_type>(-1);
96
97 private:
98 // type used for positions in insert, erase etc.
99#if __cplusplus < 201103L
100 typedef iterator __const_iterator;
101#else
102 typedef const_iterator __const_iterator;
103#endif
104
105 // Use empty-base optimization: http://www.cantrip.org/emptyopt.html
106 struct _Alloc_hider : allocator_type // TODO check __is_final
107 {
108 _Alloc_hider(pointer __dat, const _Alloc& __a = _Alloc())
109 : allocator_type(__a), _M_p(__dat) { }
110
111 pointer _M_p; // The actual data.
112 };
113
114 _Alloc_hider _M_dataplus;
115 size_type _M_string_length;
116
117 enum { _S_local_capacity = 15 / sizeof(_CharT) };
118
119 union
120 {
121 _CharT _M_local_buf[_S_local_capacity + 1];
122 size_type _M_allocated_capacity;
123 };
124
125 void
126 _M_data(pointer __p)
127 { _M_dataplus._M_p = __p; }
128
129 void
130 _M_length(size_type __length)
131 { _M_string_length = __length; }
132
133 pointer
134 _M_data() const
135 { return _M_dataplus._M_p; }
136
137 pointer
138 _M_local_data()
139 {
140#if __cplusplus >= 201103L
141 return std::pointer_traits<pointer>::pointer_to(*_M_local_buf);
142#else
143 return pointer(_M_local_buf);
144#endif
145 }
146
147 const_pointer
148 _M_local_data() const
149 {
150#if __cplusplus >= 201103L
151 return std::pointer_traits<const_pointer>::pointer_to(*_M_local_buf);
152#else
153 return const_pointer(_M_local_buf);
154#endif
155 }
156
157 void
158 _M_capacity(size_type __capacity)
159 { _M_allocated_capacity = __capacity; }
160
161 void
162 _M_set_length(size_type __n)
163 {
164 _M_length(__n);
165 traits_type::assign(_M_data()[__n], _CharT());
166 }
167
168 bool
169 _M_is_local() const
170 { return _M_data() == _M_local_data(); }
171
172 // Create & Destroy
173 pointer
174 _M_create(size_type&, size_type);
175
176 void
177 _M_dispose()
178 {
179 if (!_M_is_local())
180 _M_destroy(_M_allocated_capacity);
181 }
182
183 void
184 _M_destroy(size_type __size) throw()
185 { _Alloc_traits::deallocate(_M_get_allocator(), _M_data(), __size + 1); }
186
187 // _M_construct_aux is used to implement the 21.3.1 para 15 which
188 // requires special behaviour if _InIterator is an integral type
189 template<typename _InIterator>
190 void
191 _M_construct_aux(_InIterator __beg, _InIterator __end,
192 std::__false_type)
193 {
194 typedef typename iterator_traits<_InIterator>::iterator_category _Tag;
195 _M_construct(__beg, __end, _Tag());
196 }
197
198 // _GLIBCXX_RESOLVE_LIB_DEFECTS
199 // 438. Ambiguity in the "do the right thing" clause
200 template<typename _Integer>
201 void
202 _M_construct_aux(_Integer __beg, _Integer __end, std::__true_type)
203 { _M_construct_aux_2(static_cast<size_type>(__beg), __end); }
204
205 void
206 _M_construct_aux_2(size_type __req, _CharT __c)
207 { _M_construct(__req, __c); }
208
209 template<typename _InIterator>
210 void
211 _M_construct(_InIterator __beg, _InIterator __end)
212 {
213 typedef typename std::__is_integer<_InIterator>::__type _Integral;
214 _M_construct_aux(__beg, __end, _Integral());
215 }
216
217 // For Input Iterators, used in istreambuf_iterators, etc.
218 template<typename _InIterator>
219 void
220 _M_construct(_InIterator __beg, _InIterator __end,
221 std::input_iterator_tag);
222
223 // For forward_iterators up to random_access_iterators, used for
224 // string::iterator, _CharT*, etc.
225 template<typename _FwdIterator>
226 void
227 _M_construct(_FwdIterator __beg, _FwdIterator __end,
228 std::forward_iterator_tag);
229
230 void
231 _M_construct(size_type __req, _CharT __c);
232
233 allocator_type&
234 _M_get_allocator()
235 { return _M_dataplus; }
236
237 const allocator_type&
238 _M_get_allocator() const
239 { return _M_dataplus; }
240
241 private:
242
243#ifdef _GLIBCXX_DISAMBIGUATE_REPLACE_INST
244 // The explicit instantiations in misc-inst.cc require this due to
245 // https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64063
246 template<typename _Tp, bool _Requires =
247 !__are_same<_Tp, _CharT*>::__value
248 && !__are_same<_Tp, const _CharT*>::__value
249 && !__are_same<_Tp, iterator>::__value
250 && !__are_same<_Tp, const_iterator>::__value>
251 struct __enable_if_not_native_iterator
252 { typedef basic_string& __type; };
253 template<typename _Tp>
254 struct __enable_if_not_native_iterator<_Tp, false> { };
255#endif
256
257 size_type
258 _M_check(size_type __pos, const char* __s) const
259 {
260 if (__pos > this->size())
261 __throw_out_of_range_fmt(__N("%s: __pos (which is %zu) > "
262 "this->size() (which is %zu)"),
263 __s, __pos, this->size());
264 return __pos;
265 }
266
267 void
268 _M_check_length(size_type __n1, size_type __n2, const char* __s) const
269 {
270 if (this->max_size() - (this->size() - __n1) < __n2)
271 __throw_length_error(__N(__s));
272 }
273
274
275 // NB: _M_limit doesn't check for a bad __pos value.
276 size_type
277 _M_limit(size_type __pos, size_type __off) const _GLIBCXX_NOEXCEPT
278 {
279 const bool __testoff = __off < this->size() - __pos;
280 return __testoff ? __off : this->size() - __pos;
281 }
282
283 // True if _Rep and source do not overlap.
284 bool
285 _M_disjunct(const _CharT* __s) const _GLIBCXX_NOEXCEPT
286 {
287 return (less<const _CharT*>()(__s, _M_data())
288 || less<const _CharT*>()(_M_data() + this->size(), __s));
289 }
290
291 // When __n = 1 way faster than the general multichar
292 // traits_type::copy/move/assign.
293 static void
294 _S_copy(_CharT* __d, const _CharT* __s, size_type __n)
295 {
296 if (__n == 1)
297 traits_type::assign(*__d, *__s);
298 else
299 traits_type::copy(__d, __s, __n);
300 }
301
302 static void
303 _S_move(_CharT* __d, const _CharT* __s, size_type __n)
304 {
305 if (__n == 1)
306 traits_type::assign(*__d, *__s);
307 else
308 traits_type::move(__d, __s, __n);
309 }
310
311 static void
312 _S_assign(_CharT* __d, size_type __n, _CharT __c)
313 {
314 if (__n == 1)
315 traits_type::assign(*__d, __c);
316 else
317 traits_type::assign(__d, __n, __c);
318 }
319
320 // _S_copy_chars is a separate template to permit specialization
321 // to optimize for the common case of pointers as iterators.
322 template<class _Iterator>
323 static void
324 _S_copy_chars(_CharT* __p, _Iterator __k1, _Iterator __k2)
325 {
326 for (; __k1 != __k2; ++__k1, ++__p)
327 traits_type::assign(*__p, *__k1); // These types are off.
328 }
329
330 static void
331 _S_copy_chars(_CharT* __p, iterator __k1, iterator __k2) _GLIBCXX_NOEXCEPT
332 { _S_copy_chars(__p, __k1.base(), __k2.base()); }
333
334 static void
335 _S_copy_chars(_CharT* __p, const_iterator __k1, const_iterator __k2)
336 _GLIBCXX_NOEXCEPT
337 { _S_copy_chars(__p, __k1.base(), __k2.base()); }
338
339 static void
340 _S_copy_chars(_CharT* __p, _CharT* __k1, _CharT* __k2) _GLIBCXX_NOEXCEPT
341 { _S_copy(__p, __k1, __k2 - __k1); }
342
343 static void
344 _S_copy_chars(_CharT* __p, const _CharT* __k1, const _CharT* __k2)
345 _GLIBCXX_NOEXCEPT
346 { _S_copy(__p, __k1, __k2 - __k1); }
347
348 static int
349 _S_compare(size_type __n1, size_type __n2) _GLIBCXX_NOEXCEPT
350 {
351 const difference_type __d = difference_type(__n1 - __n2);
352
353 if (__d > __gnu_cxx::__numeric_traits<int>::__max)
354 return __gnu_cxx::__numeric_traits<int>::__max;
355 else if (__d < __gnu_cxx::__numeric_traits<int>::__min)
356 return __gnu_cxx::__numeric_traits<int>::__min;
357 else
358 return int(__d);
359 }
360
361 void
362 _M_assign(const basic_string& __rcs);
363
364 void
365 _M_mutate(size_type __pos, size_type __len1, const _CharT* __s,
366 size_type __len2);
367
368 void
369 _M_erase(size_type __pos, size_type __n);
370
371 public:
372 // Construct/copy/destroy:
373 // NB: We overload ctors in some cases instead of using default
374 // arguments, per 17.4.4.4 para. 2 item 2.
375
376 /**
377 * @brief Default constructor creates an empty string.
378 */
379 basic_string()
380#if __cplusplus >= 201103L
381 noexcept(is_nothrow_default_constructible<_Alloc>::value)
382#endif
383 : _M_dataplus(_M_local_data())
384 { _M_set_length(0); }
385
386 /**
387 * @brief Construct an empty string using allocator @a a.
388 */
389 explicit
390 basic_string(const _Alloc& __a)
391 : _M_dataplus(_M_local_data(), __a)
392 { _M_set_length(0); }
393
394 /**
395 * @brief Construct string with copy of value of @a __str.
396 * @param __str Source string.
397 */
398 basic_string(const basic_string& __str)
399 : _M_dataplus(_M_local_data(), __str._M_get_allocator()) // TODO A traits
400 { _M_construct(__str._M_data(), __str._M_data() + __str.length()); }
401
402 /**
403 * @brief Construct string as copy of a substring.
404 * @param __str Source string.
405 * @param __pos Index of first character to copy from.
406 * @param __n Number of characters to copy (default remainder).
407 */
408 // _GLIBCXX_RESOLVE_LIB_DEFECTS
409 // 2402. [this constructor] shouldn't use Allocator()
410 basic_string(const basic_string& __str, size_type __pos,
411 size_type __n = npos)
412 : _M_dataplus(_M_local_data())
413 {
414 const _CharT* __start = __str._M_data()
415 + __str._M_check(__pos, "basic_string::basic_string");
416 _M_construct(__start, __start + __str._M_limit(__pos, __n));
417 }
418
419 /**
420 * @brief Construct string as copy of a substring.
421 * @param __str Source string.
422 * @param __pos Index of first character to copy from.
423 * @param __n Number of characters to copy (default remainder).
424 * @param __a Allocator to use.
425 */
426 basic_string(const basic_string& __str, size_type __pos,
427 size_type __n, const _Alloc& __a)
428 : _M_dataplus(_M_local_data(), __a)
429 {
430 const _CharT* __start
431 = __str._M_data() + __str._M_check(__pos, "string::string");
432 _M_construct(__start, __start + __str._M_limit(__pos, __n));
433 }
434
435 /**
436 * @brief Construct string initialized by a character %array.
437 * @param __s Source character %array.
438 * @param __n Number of characters to copy.
439 * @param __a Allocator to use (default is default allocator).
440 *
441 * NB: @a __s must have at least @a __n characters, &apos;\\0&apos;
442 * has no special meaning.
443 */
444 basic_string(const _CharT* __s, size_type __n,
445 const _Alloc& __a = _Alloc())
446 : _M_dataplus(_M_local_data(), __a)
447 { _M_construct(__s, __s + __n); }
448
449 /**
450 * @brief Construct string as copy of a C string.
451 * @param __s Source C string.
452 * @param __a Allocator to use (default is default allocator).
453 */
454 basic_string(const _CharT* __s, const _Alloc& __a = _Alloc())
455 : _M_dataplus(_M_local_data(), __a)
456 { _M_construct(__s, __s ? __s + traits_type::length(__s) : __s+npos); }
457
458 /**
459 * @brief Construct string as multiple characters.
460 * @param __n Number of characters.
461 * @param __c Character to use.
462 * @param __a Allocator to use (default is default allocator).
463 */
464 basic_string(size_type __n, _CharT __c, const _Alloc& __a = _Alloc())
465 : _M_dataplus(_M_local_data(), __a)
466 { _M_construct(__n, __c); }
467
468#if __cplusplus >= 201103L
469 /**
470 * @brief Move construct string.
471 * @param __str Source string.
472 *
473 * The newly-created string contains the exact contents of @a __str.
474 * @a __str is a valid, but unspecified string.
475 **/
476 basic_string(basic_string&& __str) noexcept
477 : _M_dataplus(_M_local_data(), std::move(__str._M_get_allocator()))
478 {
479 if (__str._M_is_local())
480 {
481 traits_type::copy(_M_local_buf, __str._M_local_buf,
482 _S_local_capacity + 1);
483 }
484 else
485 {
486 _M_data(__str._M_data());
487 _M_capacity(__str._M_allocated_capacity);
488 }
489
490 // Must use _M_length() here not _M_set_length() because
491 // basic_stringbuf relies on writing into unallocated capacity so
492 // we mess up the contents if we put a '\0' in the string.
493 _M_length(__str.length());
494 __str._M_data(__str._M_local_data());
495 __str._M_set_length(0);
496 }
497
498 /**
499 * @brief Construct string from an initializer %list.
500 * @param __l std::initializer_list of characters.
501 * @param __a Allocator to use (default is default allocator).
502 */
503 basic_string(initializer_list<_CharT> __l, const _Alloc& __a = _Alloc())
504 : _M_dataplus(_M_local_data(), __a)
505 { _M_construct(__l.begin(), __l.end()); }
506
507 basic_string(const basic_string& __str, const _Alloc& __a)
508 : _M_dataplus(_M_local_data(), __a)
509 { _M_construct(__str.begin(), __str.end()); }
510
511 basic_string(basic_string&& __str, const _Alloc& __a)
512 : _M_dataplus(_M_local_data(), __a)
513 {
514 if (__str.get_allocator() == __a)
515 *this = std::move(__str);
516 else
517 _M_construct(__str.begin(), __str.end());
518 }
519
520#endif // C++11
521
522 /**
523 * @brief Construct string as copy of a range.
524 * @param __beg Start of range.
525 * @param __end End of range.
526 * @param __a Allocator to use (default is default allocator).
527 */
528#if __cplusplus >= 201103L
529 template<typename _InputIterator,
530 typename = std::_RequireInputIter<_InputIterator>>
531#else
532 template<typename _InputIterator>
533#endif
534 basic_string(_InputIterator __beg, _InputIterator __end,
535 const _Alloc& __a = _Alloc())
536 : _M_dataplus(_M_local_data(), __a)
537 { _M_construct(__beg, __end); }
538
539 /**
540 * @brief Destroy the string instance.
541 */
542 ~basic_string()
543 { _M_dispose(); }
544
545 /**
546 * @brief Assign the value of @a str to this string.
547 * @param __str Source string.
548 */
549 basic_string&
550 operator=(const basic_string& __str)
551 { return this->assign(__str); }
552
553 /**
554 * @brief Copy contents of @a s into this string.
555 * @param __s Source null-terminated string.
556 */
557 basic_string&
558 operator=(const _CharT* __s)
559 { return this->assign(__s); }
560
561 /**
562 * @brief Set value to string of length 1.
563 * @param __c Source character.
564 *
565 * Assigning to a character makes this string length 1 and
566 * (*this)[0] == @a c.
567 */
568 basic_string&
569 operator=(_CharT __c)
570 {
571 this->assign(1, __c);
572 return *this;
573 }
574
575#if __cplusplus >= 201103L
576 /**
577 * @brief Move assign the value of @a str to this string.
578 * @param __str Source string.
579 *
580 * The contents of @a str are moved into this string (without copying).
581 * @a str is a valid, but unspecified string.
582 **/
583 // PR 58265, this should be noexcept.
584 // _GLIBCXX_RESOLVE_LIB_DEFECTS
585 // 2063. Contradictory requirements for string move assignment
586 basic_string&
587 operator=(basic_string&& __str)
588 {
589 this->swap(__str);
590 return *this;
591 }
592
593 /**
594 * @brief Set value to string constructed from initializer %list.
595 * @param __l std::initializer_list.
596 */
597 basic_string&
598 operator=(initializer_list<_CharT> __l)
599 {
600 this->assign(__l.begin(), __l.size());
601 return *this;
602 }
603#endif // C++11
604
605 // Iterators:
606 /**
607 * Returns a read/write iterator that points to the first character in
608 * the %string.
609 */
610 iterator
611 begin() _GLIBCXX_NOEXCEPT
612 { return iterator(_M_data()); }
613
614 /**
615 * Returns a read-only (constant) iterator that points to the first
616 * character in the %string.
617 */
618 const_iterator
619 begin() const _GLIBCXX_NOEXCEPT
620 { return const_iterator(_M_data()); }
621
622 /**
623 * Returns a read/write iterator that points one past the last
624 * character in the %string.
625 */
626 iterator
627 end() _GLIBCXX_NOEXCEPT
628 { return iterator(_M_data() + this->size()); }
629
630 /**
631 * Returns a read-only (constant) iterator that points one past the
632 * last character in the %string.
633 */
634 const_iterator
635 end() const _GLIBCXX_NOEXCEPT
636 { return const_iterator(_M_data() + this->size()); }
637
638 /**
639 * Returns a read/write reverse iterator that points to the last
640 * character in the %string. Iteration is done in reverse element
641 * order.
642 */
643 reverse_iterator
644 rbegin() _GLIBCXX_NOEXCEPT
645 { return reverse_iterator(this->end()); }
646
647 /**
648 * Returns a read-only (constant) reverse iterator that points
649 * to the last character in the %string. Iteration is done in
650 * reverse element order.
651 */
652 const_reverse_iterator
653 rbegin() const _GLIBCXX_NOEXCEPT
654 { return const_reverse_iterator(this->end()); }
655
656 /**
657 * Returns a read/write reverse iterator that points to one before the
658 * first character in the %string. Iteration is done in reverse
659 * element order.
660 */
661 reverse_iterator
662 rend() _GLIBCXX_NOEXCEPT
663 { return reverse_iterator(this->begin()); }
664
665 /**
666 * Returns a read-only (constant) reverse iterator that points
667 * to one before the first character in the %string. Iteration
668 * is done in reverse element order.
669 */
670 const_reverse_iterator
671 rend() const _GLIBCXX_NOEXCEPT
672 { return const_reverse_iterator(this->begin()); }
673
674#if __cplusplus >= 201103L
675 /**
676 * Returns a read-only (constant) iterator that points to the first
677 * character in the %string.
678 */
679 const_iterator
680 cbegin() const noexcept
681 { return const_iterator(this->_M_data()); }
682
683 /**
684 * Returns a read-only (constant) iterator that points one past the
685 * last character in the %string.
686 */
687 const_iterator
688 cend() const noexcept
689 { return const_iterator(this->_M_data() + this->size()); }
690
691 /**
692 * Returns a read-only (constant) reverse iterator that points
693 * to the last character in the %string. Iteration is done in
694 * reverse element order.
695 */
696 const_reverse_iterator
697 crbegin() const noexcept
698 { return const_reverse_iterator(this->end()); }
699
700 /**
701 * Returns a read-only (constant) reverse iterator that points
702 * to one before the first character in the %string. Iteration
703 * is done in reverse element order.
704 */
705 const_reverse_iterator
706 crend() const noexcept
707 { return const_reverse_iterator(this->begin()); }
708#endif
709
710 public:
711 // Capacity:
712 /// Returns the number of characters in the string, not including any
713 /// null-termination.
714 size_type
715 size() const _GLIBCXX_NOEXCEPT
716 { return _M_string_length; }
717
718 /// Returns the number of characters in the string, not including any
719 /// null-termination.
720 size_type
721 length() const _GLIBCXX_NOEXCEPT
722 { return _M_string_length; }
723
724 /// Returns the size() of the largest possible %string.
725 size_type
726 max_size() const _GLIBCXX_NOEXCEPT
727 { return (_Alloc_traits::max_size(_M_get_allocator()) - 1) / 2; }
728
729 /**
730 * @brief Resizes the %string to the specified number of characters.
731 * @param __n Number of characters the %string should contain.
732 * @param __c Character to fill any new elements.
733 *
734 * This function will %resize the %string to the specified
735 * number of characters. If the number is smaller than the
736 * %string's current size the %string is truncated, otherwise
737 * the %string is extended and new elements are %set to @a __c.
738 */
739 void
740 resize(size_type __n, _CharT __c);
741
742 /**
743 * @brief Resizes the %string to the specified number of characters.
744 * @param __n Number of characters the %string should contain.
745 *
746 * This function will resize the %string to the specified length. If
747 * the new size is smaller than the %string's current size the %string
748 * is truncated, otherwise the %string is extended and new characters
749 * are default-constructed. For basic types such as char, this means
750 * setting them to 0.
751 */
752 void
753 resize(size_type __n)
754 { this->resize(__n, _CharT()); }
755
756#if __cplusplus >= 201103L
757 /// A non-binding request to reduce capacity() to size().
758 void
759 shrink_to_fit() noexcept
760 {
761#if __cpp_exceptions
762 if (capacity() > size())
763 {
764 try
765 { reserve(0); }
766 catch(...)
767 { }
768 }
769#endif
770 }
771#endif
772
773 /**
774 * Returns the total number of characters that the %string can hold
775 * before needing to allocate more memory.
776 */
777 size_type
778 capacity() const _GLIBCXX_NOEXCEPT
779 {
780 return _M_is_local() ? size_type(_S_local_capacity)
781 : _M_allocated_capacity;
782 }
783
784 /**
785 * @brief Attempt to preallocate enough memory for specified number of
786 * characters.
787 * @param __res_arg Number of characters required.
788 * @throw std::length_error If @a __res_arg exceeds @c max_size().
789 *
790 * This function attempts to reserve enough memory for the
791 * %string to hold the specified number of characters. If the
792 * number requested is more than max_size(), length_error is
793 * thrown.
794 *
795 * The advantage of this function is that if optimal code is a
796 * necessity and the user can determine the string length that will be
797 * required, the user can reserve the memory in %advance, and thus
798 * prevent a possible reallocation of memory and copying of %string
799 * data.
800 */
801 void
802 reserve(size_type __res_arg = 0);
803
804 /**
805 * Erases the string, making it empty.
806 */
807 void
808 clear() _GLIBCXX_NOEXCEPT
809 { _M_set_length(0); }
810
811 /**
812 * Returns true if the %string is empty. Equivalent to
813 * <code>*this == ""</code>.
814 */
815 bool
816 empty() const _GLIBCXX_NOEXCEPT
817 { return this->size() == 0; }
818
819 // Element access:
820 /**
821 * @brief Subscript access to the data contained in the %string.
822 * @param __pos The index of the character to access.
823 * @return Read-only (constant) reference to the character.
824 *
825 * This operator allows for easy, array-style, data access.
826 * Note that data access with this operator is unchecked and
827 * out_of_range lookups are not defined. (For checked lookups
828 * see at().)
829 */
830 const_reference
831 operator[] (size_type __pos) const _GLIBCXX_NOEXCEPT
832 {
833 _GLIBCXX_DEBUG_ASSERT(__pos <= size());
834 return _M_data()[__pos];
835 }
836
837 /**
838 * @brief Subscript access to the data contained in the %string.
839 * @param __pos The index of the character to access.
840 * @return Read/write reference to the character.
841 *
842 * This operator allows for easy, array-style, data access.
843 * Note that data access with this operator is unchecked and
844 * out_of_range lookups are not defined. (For checked lookups
845 * see at().)
846 */
847 reference
848 operator[](size_type __pos)
849 {
850 // Allow pos == size() both in C++98 mode, as v3 extension,
851 // and in C++11 mode.
852 _GLIBCXX_DEBUG_ASSERT(__pos <= size());
853 // In pedantic mode be strict in C++98 mode.
854 _GLIBCXX_DEBUG_PEDASSERT(__cplusplus >= 201103L || __pos < size());
855 return _M_data()[__pos];
856 }
857
858 /**
859 * @brief Provides access to the data contained in the %string.
860 * @param __n The index of the character to access.
861 * @return Read-only (const) reference to the character.
862 * @throw std::out_of_range If @a n is an invalid index.
863 *
864 * This function provides for safer data access. The parameter is
865 * first checked that it is in the range of the string. The function
866 * throws out_of_range if the check fails.
867 */
868 const_reference
869 at(size_type __n) const
870 {
871 if (__n >= this->size())
872 __throw_out_of_range_fmt(__N("basic_string::at: __n "
873 "(which is %zu) >= this->size() "
874 "(which is %zu)"),
875 __n, this->size());
876 return _M_data()[__n];
877 }
878
879 /**
880 * @brief Provides access to the data contained in the %string.
881 * @param __n The index of the character to access.
882 * @return Read/write reference to the character.
883 * @throw std::out_of_range If @a n is an invalid index.
884 *
885 * This function provides for safer data access. The parameter is
886 * first checked that it is in the range of the string. The function
887 * throws out_of_range if the check fails.
888 */
889 reference
890 at(size_type __n)
891 {
892 if (__n >= size())
893 __throw_out_of_range_fmt(__N("basic_string::at: __n "
894 "(which is %zu) >= this->size() "
895 "(which is %zu)"),
896 __n, this->size());
897 return _M_data()[__n];
898 }
899
900#if __cplusplus >= 201103L
901 /**
902 * Returns a read/write reference to the data at the first
903 * element of the %string.
904 */
905 reference
906 front() noexcept
907 { return operator[](0); }
908
909 /**
910 * Returns a read-only (constant) reference to the data at the first
911 * element of the %string.
912 */
913 const_reference
914 front() const noexcept
915 { return operator[](0); }
916
917 /**
918 * Returns a read/write reference to the data at the last
919 * element of the %string.
920 */
921 reference
922 back() noexcept
923 { return operator[](this->size() - 1); }
924
925 /**
926 * Returns a read-only (constant) reference to the data at the
927 * last element of the %string.
928 */
929 const_reference
930 back() const noexcept
931 { return operator[](this->size() - 1); }
932#endif
933
934 // Modifiers:
935 /**
936 * @brief Append a string to this string.
937 * @param __str The string to append.
938 * @return Reference to this string.
939 */
940 basic_string&
941 operator+=(const basic_string& __str)
942 { return this->append(__str); }
943
944 /**
945 * @brief Append a C string.
946 * @param __s The C string to append.
947 * @return Reference to this string.
948 */
949 basic_string&
950 operator+=(const _CharT* __s)
951 { return this->append(__s); }
952
953 /**
954 * @brief Append a character.
955 * @param __c The character to append.
956 * @return Reference to this string.
957 */
958 basic_string&
959 operator+=(_CharT __c)
960 {
961 this->push_back(__c);
962 return *this;
963 }
964
965#if __cplusplus >= 201103L
966 /**
967 * @brief Append an initializer_list of characters.
968 * @param __l The initializer_list of characters to be appended.
969 * @return Reference to this string.
970 */
971 basic_string&
972 operator+=(initializer_list<_CharT> __l)
973 { return this->append(__l.begin(), __l.size()); }
974#endif // C++11
975
976 /**
977 * @brief Append a string to this string.
978 * @param __str The string to append.
979 * @return Reference to this string.
980 */
981 basic_string&
982 append(const basic_string& __str)
983 { return _M_append(__str._M_data(), __str.size()); }
984
985 /**
986 * @brief Append a substring.
987 * @param __str The string to append.
988 * @param __pos Index of the first character of str to append.
989 * @param __n The number of characters to append.
990 * @return Reference to this string.
991 * @throw std::out_of_range if @a __pos is not a valid index.
992 *
993 * This function appends @a __n characters from @a __str
994 * starting at @a __pos to this string. If @a __n is is larger
995 * than the number of available characters in @a __str, the
996 * remainder of @a __str is appended.
997 */
998 basic_string&
999 append(const basic_string& __str, size_type __pos, size_type __n)
1000 { return _M_append(__str._M_data()
1001 + __str._M_check(__pos, "basic_string::append"),
1002 __str._M_limit(__pos, __n)); }
1003
1004 /**
1005 * @brief Append a C substring.
1006 * @param __s The C string to append.
1007 * @param __n The number of characters to append.
1008 * @return Reference to this string.
1009 */
1010 basic_string&
1011 append(const _CharT* __s, size_type __n)
1012 {
1013 __glibcxx_requires_string_len(__s, __n);
1014 _M_check_length(size_type(0), __n, "basic_string::append");
1015 return _M_append(__s, __n);
1016 }
1017
1018 /**
1019 * @brief Append a C string.
1020 * @param __s The C string to append.
1021 * @return Reference to this string.
1022 */
1023 basic_string&
1024 append(const _CharT* __s)
1025 {
1026 __glibcxx_requires_string(__s);
1027 const size_type __n = traits_type::length(__s);
1028 _M_check_length(size_type(0), __n, "basic_string::append");
1029 return _M_append(__s, __n);
1030 }
1031
1032 /**
1033 * @brief Append multiple characters.
1034 * @param __n The number of characters to append.
1035 * @param __c The character to use.
1036 * @return Reference to this string.
1037 *
1038 * Appends __n copies of __c to this string.
1039 */
1040 basic_string&
1041 append(size_type __n, _CharT __c)
1042 { return _M_replace_aux(this->size(), size_type(0), __n, __c); }
1043
1044#if __cplusplus >= 201103L
1045 /**
1046 * @brief Append an initializer_list of characters.
1047 * @param __l The initializer_list of characters to append.
1048 * @return Reference to this string.
1049 */
1050 basic_string&
1051 append(initializer_list<_CharT> __l)
1052 { return this->append(__l.begin(), __l.size()); }
1053#endif // C++11
1054
1055 /**
1056 * @brief Append a range of characters.
1057 * @param __first Iterator referencing the first character to append.
1058 * @param __last Iterator marking the end of the range.
1059 * @return Reference to this string.
1060 *
1061 * Appends characters in the range [__first,__last) to this string.
1062 */
1063#if __cplusplus >= 201103L
1064 template<class _InputIterator,
1065 typename = std::_RequireInputIter<_InputIterator>>
1066#else
1067 template<class _InputIterator>
1068#endif
1069 basic_string&
1070 append(_InputIterator __first, _InputIterator __last)
1071 { return this->replace(end(), end(), __first, __last); }
1072
1073 /**
1074 * @brief Append a single character.
1075 * @param __c Character to append.
1076 */
1077 void
1078 push_back(_CharT __c)
1079 {
1080 const size_type __size = this->size();
1081 if (__size + 1 > this->capacity())
1082 this->_M_mutate(__size, size_type(0), 0, size_type(1));
1083 traits_type::assign(this->_M_data()[__size], __c);
1084 this->_M_set_length(__size + 1);
1085 }
1086
1087 /**
1088 * @brief Set value to contents of another string.
1089 * @param __str Source string to use.
1090 * @return Reference to this string.
1091 */
1092 basic_string&
1093 assign(const basic_string& __str)
1094 {
1095 this->_M_assign(__str);
1096 return *this;
1097 }
1098
1099#if __cplusplus >= 201103L
1100 /**
1101 * @brief Set value to contents of another string.
1102 * @param __str Source string to use.
1103 * @return Reference to this string.
1104 *
1105 * This function sets this string to the exact contents of @a __str.
1106 * @a __str is a valid, but unspecified string.
1107 */
1108 basic_string&
1109 assign(basic_string&& __str)
1110 {
1111 // _GLIBCXX_RESOLVE_LIB_DEFECTS
1112 // 2063. Contradictory requirements for string move assignment
1113 return *this = std::move(__str);
1114 }
1115#endif // C++11
1116
1117 /**
1118 * @brief Set value to a substring of a string.
1119 * @param __str The string to use.
1120 * @param __pos Index of the first character of str.
1121 * @param __n Number of characters to use.
1122 * @return Reference to this string.
1123 * @throw std::out_of_range if @a pos is not a valid index.
1124 *
1125 * This function sets this string to the substring of @a __str
1126 * consisting of @a __n characters at @a __pos. If @a __n is
1127 * is larger than the number of available characters in @a
1128 * __str, the remainder of @a __str is used.
1129 */
1130 basic_string&
1131 assign(const basic_string& __str, size_type __pos, size_type __n)
1132 { return _M_replace(size_type(0), this->size(), __str._M_data()
1133 + __str._M_check(__pos, "basic_string::assign"),
1134 __str._M_limit(__pos, __n)); }
1135
1136 /**
1137 * @brief Set value to a C substring.
1138 * @param __s The C string to use.
1139 * @param __n Number of characters to use.
1140 * @return Reference to this string.
1141 *
1142 * This function sets the value of this string to the first @a __n
1143 * characters of @a __s. If @a __n is is larger than the number of
1144 * available characters in @a __s, the remainder of @a __s is used.
1145 */
1146 basic_string&
1147 assign(const _CharT* __s, size_type __n)
1148 {
1149 __glibcxx_requires_string_len(__s, __n);
1150 return _M_replace(size_type(0), this->size(), __s, __n);
1151 }
1152
1153 /**
1154 * @brief Set value to contents of a C string.
1155 * @param __s The C string to use.
1156 * @return Reference to this string.
1157 *
1158 * This function sets the value of this string to the value of @a __s.
1159 * The data is copied, so there is no dependence on @a __s once the
1160 * function returns.
1161 */
1162 basic_string&
1163 assign(const _CharT* __s)
1164 {
1165 __glibcxx_requires_string(__s);
1166 return _M_replace(size_type(0), this->size(), __s,
1167 traits_type::length(__s));
1168 }
1169
1170 /**
1171 * @brief Set value to multiple characters.
1172 * @param __n Length of the resulting string.
1173 * @param __c The character to use.
1174 * @return Reference to this string.
1175 *
1176 * This function sets the value of this string to @a __n copies of
1177 * character @a __c.
1178 */
1179 basic_string&
1180 assign(size_type __n, _CharT __c)
1181 { return _M_replace_aux(size_type(0), this->size(), __n, __c); }
1182
1183 /**
1184 * @brief Set value to a range of characters.
1185 * @param __first Iterator referencing the first character to append.
1186 * @param __last Iterator marking the end of the range.
1187 * @return Reference to this string.
1188 *
1189 * Sets value of string to characters in the range [__first,__last).
1190 */
1191#if __cplusplus >= 201103L
1192 template<class _InputIterator,
1193 typename = std::_RequireInputIter<_InputIterator>>
1194#else
1195 template<class _InputIterator>
1196#endif
1197 basic_string&
1198 assign(_InputIterator __first, _InputIterator __last)
1199 { return this->replace(begin(), end(), __first, __last); }
1200
1201#if __cplusplus >= 201103L
1202 /**
1203 * @brief Set value to an initializer_list of characters.
1204 * @param __l The initializer_list of characters to assign.
1205 * @return Reference to this string.
1206 */
1207 basic_string&
1208 assign(initializer_list<_CharT> __l)
1209 { return this->assign(__l.begin(), __l.size()); }
1210#endif // C++11
1211
1212#if __cplusplus >= 201103L
1213 /**
1214 * @brief Insert multiple characters.
1215 * @param __p Const_iterator referencing location in string to
1216 * insert at.
1217 * @param __n Number of characters to insert
1218 * @param __c The character to insert.
1219 * @return Iterator referencing the first inserted char.
1220 * @throw std::length_error If new length exceeds @c max_size().
1221 *
1222 * Inserts @a __n copies of character @a __c starting at the
1223 * position referenced by iterator @a __p. If adding
1224 * characters causes the length to exceed max_size(),
1225 * length_error is thrown. The value of the string doesn't
1226 * change if an error is thrown.
1227 */
1228 iterator
1229 insert(const_iterator __p, size_type __n, _CharT __c)
1230 {
1231 _GLIBCXX_DEBUG_PEDASSERT(__p >= begin() && __p <= end());
1232 const size_type __pos = __p - begin();
1233 this->replace(__p, __p, __n, __c);
1234 return iterator(this->_M_data() + __pos);
1235 }
1236#else
1237 /**
1238 * @brief Insert multiple characters.
1239 * @param __p Iterator referencing location in string to insert at.
1240 * @param __n Number of characters to insert
1241 * @param __c The character to insert.
1242 * @throw std::length_error If new length exceeds @c max_size().
1243 *
1244 * Inserts @a __n copies of character @a __c starting at the
1245 * position referenced by iterator @a __p. If adding
1246 * characters causes the length to exceed max_size(),
1247 * length_error is thrown. The value of the string doesn't
1248 * change if an error is thrown.
1249 */
1250 void
1251 insert(iterator __p, size_type __n, _CharT __c)
1252 { this->replace(__p, __p, __n, __c); }
1253#endif
1254
1255#if __cplusplus >= 201103L
1256 /**
1257 * @brief Insert a range of characters.
1258 * @param __p Const_iterator referencing location in string to
1259 * insert at.
1260 * @param __beg Start of range.
1261 * @param __end End of range.
1262 * @return Iterator referencing the first inserted char.
1263 * @throw std::length_error If new length exceeds @c max_size().
1264 *
1265 * Inserts characters in range [beg,end). If adding characters
1266 * causes the length to exceed max_size(), length_error is
1267 * thrown. The value of the string doesn't change if an error
1268 * is thrown.
1269 */
1270 template<class _InputIterator,
1271 typename = std::_RequireInputIter<_InputIterator>>
1272 iterator
1273 insert(const_iterator __p, _InputIterator __beg, _InputIterator __end)
1274 {
1275 _GLIBCXX_DEBUG_PEDASSERT(__p >= begin() && __p <= end());
1276 const size_type __pos = __p - begin();
1277 this->replace(__p, __p, __beg, __end);
1278 return iterator(this->_M_data() + __pos);
1279 }
1280#else
1281 /**
1282 * @brief Insert a range of characters.
1283 * @param __p Iterator referencing location in string to insert at.
1284 * @param __beg Start of range.
1285 * @param __end End of range.
1286 * @throw std::length_error If new length exceeds @c max_size().
1287 *
1288 * Inserts characters in range [__beg,__end). If adding
1289 * characters causes the length to exceed max_size(),
1290 * length_error is thrown. The value of the string doesn't
1291 * change if an error is thrown.
1292 */
1293 template<class _InputIterator>
1294 void
1295 insert(iterator __p, _InputIterator __beg, _InputIterator __end)
1296 { this->replace(__p, __p, __beg, __end); }
1297#endif
1298
1299#if __cplusplus >= 201103L
1300 /**
1301 * @brief Insert an initializer_list of characters.
1302 * @param __p Iterator referencing location in string to insert at.
1303 * @param __l The initializer_list of characters to insert.
1304 * @throw std::length_error If new length exceeds @c max_size().
1305 */
1306 void
1307 insert(iterator __p, initializer_list<_CharT> __l)
1308 {
1309 _GLIBCXX_DEBUG_PEDASSERT(__p >= begin() && __p <= end());
1310 this->insert(__p - begin(), __l.begin(), __l.size());
1311 }
1312#endif // C++11
1313
1314 /**
1315 * @brief Insert value of a string.
1316 * @param __pos1 Iterator referencing location in string to insert at.
1317 * @param __str The string to insert.
1318 * @return Reference to this string.
1319 * @throw std::length_error If new length exceeds @c max_size().
1320 *
1321 * Inserts value of @a __str starting at @a __pos1. If adding
1322 * characters causes the length to exceed max_size(),
1323 * length_error is thrown. The value of the string doesn't
1324 * change if an error is thrown.
1325 */
1326 basic_string&
1327 insert(size_type __pos1, const basic_string& __str)
1328 { return this->replace(__pos1, size_type(0),
1329 __str._M_data(), __str.size()); }
1330
1331 /**
1332 * @brief Insert a substring.
1333 * @param __pos1 Iterator referencing location in string to insert at.
1334 * @param __str The string to insert.
1335 * @param __pos2 Start of characters in str to insert.
1336 * @param __n Number of characters to insert.
1337 * @return Reference to this string.
1338 * @throw std::length_error If new length exceeds @c max_size().
1339 * @throw std::out_of_range If @a pos1 > size() or
1340 * @a __pos2 > @a str.size().
1341 *
1342 * Starting at @a pos1, insert @a __n character of @a __str
1343 * beginning with @a __pos2. If adding characters causes the
1344 * length to exceed max_size(), length_error is thrown. If @a
1345 * __pos1 is beyond the end of this string or @a __pos2 is
1346 * beyond the end of @a __str, out_of_range is thrown. The
1347 * value of the string doesn't change if an error is thrown.
1348 */
1349 basic_string&
1350 insert(size_type __pos1, const basic_string& __str,
1351 size_type __pos2, size_type __n)
1352 { return this->replace(__pos1, size_type(0), __str._M_data()
1353 + __str._M_check(__pos2, "basic_string::insert"),
1354 __str._M_limit(__pos2, __n)); }
1355
1356 /**
1357 * @brief Insert a C substring.
1358 * @param __pos Iterator referencing location in string to insert at.
1359 * @param __s The C string to insert.
1360 * @param __n The number of characters to insert.
1361 * @return Reference to this string.
1362 * @throw std::length_error If new length exceeds @c max_size().
1363 * @throw std::out_of_range If @a __pos is beyond the end of this
1364 * string.
1365 *
1366 * Inserts the first @a __n characters of @a __s starting at @a
1367 * __pos. If adding characters causes the length to exceed
1368 * max_size(), length_error is thrown. If @a __pos is beyond
1369 * end(), out_of_range is thrown. The value of the string
1370 * doesn't change if an error is thrown.
1371 */
1372 basic_string&
1373 insert(size_type __pos, const _CharT* __s, size_type __n)
1374 { return this->replace(__pos, size_type(0), __s, __n); }
1375
1376 /**
1377 * @brief Insert a C string.
1378 * @param __pos Iterator referencing location in string to insert at.
1379 * @param __s The C string to insert.
1380 * @return Reference to this string.
1381 * @throw std::length_error If new length exceeds @c max_size().
1382 * @throw std::out_of_range If @a pos is beyond the end of this
1383 * string.
1384 *
1385 * Inserts the first @a n characters of @a __s starting at @a __pos. If
1386 * adding characters causes the length to exceed max_size(),
1387 * length_error is thrown. If @a __pos is beyond end(), out_of_range is
1388 * thrown. The value of the string doesn't change if an error is
1389 * thrown.
1390 */
1391 basic_string&
1392 insert(size_type __pos, const _CharT* __s)
1393 {
1394 __glibcxx_requires_string(__s);
1395 return this->replace(__pos, size_type(0), __s,
1396 traits_type::length(__s));
1397 }
1398
1399 /**
1400 * @brief Insert multiple characters.
1401 * @param __pos Index in string to insert at.
1402 * @param __n Number of characters to insert
1403 * @param __c The character to insert.
1404 * @return Reference to this string.
1405 * @throw std::length_error If new length exceeds @c max_size().
1406 * @throw std::out_of_range If @a __pos is beyond the end of this
1407 * string.
1408 *
1409 * Inserts @a __n copies of character @a __c starting at index
1410 * @a __pos. If adding characters causes the length to exceed
1411 * max_size(), length_error is thrown. If @a __pos > length(),
1412 * out_of_range is thrown. The value of the string doesn't
1413 * change if an error is thrown.
1414 */
1415 basic_string&
1416 insert(size_type __pos, size_type __n, _CharT __c)
1417 { return _M_replace_aux(_M_check(__pos, "basic_string::insert"),
1418 size_type(0), __n, __c); }
1419
1420 /**
1421 * @brief Insert one character.
1422 * @param __p Iterator referencing position in string to insert at.
1423 * @param __c The character to insert.
1424 * @return Iterator referencing newly inserted char.
1425 * @throw std::length_error If new length exceeds @c max_size().
1426 *
1427 * Inserts character @a __c at position referenced by @a __p.
1428 * If adding character causes the length to exceed max_size(),
1429 * length_error is thrown. If @a __p is beyond end of string,
1430 * out_of_range is thrown. The value of the string doesn't
1431 * change if an error is thrown.
1432 */
1433 iterator
1434 insert(__const_iterator __p, _CharT __c)
1435 {
1436 _GLIBCXX_DEBUG_PEDASSERT(__p >= begin() && __p <= end());
1437 const size_type __pos = __p - begin();
1438 _M_replace_aux(__pos, size_type(0), size_type(1), __c);
1439 return iterator(_M_data() + __pos);
1440 }
1441
1442 /**
1443 * @brief Remove characters.
1444 * @param __pos Index of first character to remove (default 0).
1445 * @param __n Number of characters to remove (default remainder).
1446 * @return Reference to this string.
1447 * @throw std::out_of_range If @a pos is beyond the end of this
1448 * string.
1449 *
1450 * Removes @a __n characters from this string starting at @a
1451 * __pos. The length of the string is reduced by @a __n. If
1452 * there are < @a __n characters to remove, the remainder of
1453 * the string is truncated. If @a __p is beyond end of string,
1454 * out_of_range is thrown. The value of the string doesn't
1455 * change if an error is thrown.
1456 */
1457 basic_string&
1458 erase(size_type __pos = 0, size_type __n = npos)
1459 {
1460 this->_M_erase(_M_check(__pos, "basic_string::erase"),
1461 _M_limit(__pos, __n));
1462 return *this;
1463 }
1464
1465 /**
1466 * @brief Remove one character.
1467 * @param __position Iterator referencing the character to remove.
1468 * @return iterator referencing same location after removal.
1469 *
1470 * Removes the character at @a __position from this string. The value
1471 * of the string doesn't change if an error is thrown.
1472 */
1473 iterator
1474 erase(__const_iterator __position)
1475 {
1476 _GLIBCXX_DEBUG_PEDASSERT(__position >= begin()
1477 && __position < end());
1478 const size_type __pos = __position - begin();
1479 this->_M_erase(__pos, size_type(1));
1480 return iterator(_M_data() + __pos);
1481 }
1482
1483 /**
1484 * @brief Remove a range of characters.
1485 * @param __first Iterator referencing the first character to remove.
1486 * @param __last Iterator referencing the end of the range.
1487 * @return Iterator referencing location of first after removal.
1488 *
1489 * Removes the characters in the range [first,last) from this string.
1490 * The value of the string doesn't change if an error is thrown.
1491 */
1492 iterator
1493 erase(__const_iterator __first, __const_iterator __last)
1494 {
1495 _GLIBCXX_DEBUG_PEDASSERT(__first >= begin() && __first <= __last
1496 && __last <= end());
1497 const size_type __pos = __first - begin();
1498 this->_M_erase(__pos, __last - __first);
1499 return iterator(this->_M_data() + __pos);
1500 }
1501
1502#if __cplusplus >= 201103L
1503 /**
1504 * @brief Remove the last character.
1505 *
1506 * The string must be non-empty.
1507 */
1508 void
1509 pop_back() noexcept
1510 { _M_erase(size()-1, 1); }
1511#endif // C++11
1512
1513 /**
1514 * @brief Replace characters with value from another string.
1515 * @param __pos Index of first character to replace.
1516 * @param __n Number of characters to be replaced.
1517 * @param __str String to insert.
1518 * @return Reference to this string.
1519 * @throw std::out_of_range If @a pos is beyond the end of this
1520 * string.
1521 * @throw std::length_error If new length exceeds @c max_size().
1522 *
1523 * Removes the characters in the range [__pos,__pos+__n) from
1524 * this string. In place, the value of @a __str is inserted.
1525 * If @a __pos is beyond end of string, out_of_range is thrown.
1526 * If the length of the result exceeds max_size(), length_error
1527 * is thrown. The value of the string doesn't change if an
1528 * error is thrown.
1529 */
1530 basic_string&
1531 replace(size_type __pos, size_type __n, const basic_string& __str)
1532 { return this->replace(__pos, __n, __str._M_data(), __str.size()); }
1533
1534 /**
1535 * @brief Replace characters with value from another string.
1536 * @param __pos1 Index of first character to replace.
1537 * @param __n1 Number of characters to be replaced.
1538 * @param __str String to insert.
1539 * @param __pos2 Index of first character of str to use.
1540 * @param __n2 Number of characters from str to use.
1541 * @return Reference to this string.
1542 * @throw std::out_of_range If @a __pos1 > size() or @a __pos2 >
1543 * __str.size().
1544 * @throw std::length_error If new length exceeds @c max_size().
1545 *
1546 * Removes the characters in the range [__pos1,__pos1 + n) from this
1547 * string. In place, the value of @a __str is inserted. If @a __pos is
1548 * beyond end of string, out_of_range is thrown. If the length of the
1549 * result exceeds max_size(), length_error is thrown. The value of the
1550 * string doesn't change if an error is thrown.
1551 */
1552 basic_string&
1553 replace(size_type __pos1, size_type __n1, const basic_string& __str,
1554 size_type __pos2, size_type __n2)
1555 { return this->replace(__pos1, __n1, __str._M_data()
1556 + __str._M_check(__pos2, "basic_string::replace"),
1557 __str._M_limit(__pos2, __n2)); }
1558
1559 /**
1560 * @brief Replace characters with value of a C substring.
1561 * @param __pos Index of first character to replace.
1562 * @param __n1 Number of characters to be replaced.
1563 * @param __s C string to insert.
1564 * @param __n2 Number of characters from @a s to use.
1565 * @return Reference to this string.
1566 * @throw std::out_of_range If @a pos1 > size().
1567 * @throw std::length_error If new length exceeds @c max_size().
1568 *
1569 * Removes the characters in the range [__pos,__pos + __n1)
1570 * from this string. In place, the first @a __n2 characters of
1571 * @a __s are inserted, or all of @a __s if @a __n2 is too large. If
1572 * @a __pos is beyond end of string, out_of_range is thrown. If
1573 * the length of result exceeds max_size(), length_error is
1574 * thrown. The value of the string doesn't change if an error
1575 * is thrown.
1576 */
1577 basic_string&
1578 replace(size_type __pos, size_type __n1, const _CharT* __s,
1579 size_type __n2)
1580 {
1581 __glibcxx_requires_string_len(__s, __n2);
1582 return _M_replace(_M_check(__pos, "basic_string::replace"),
1583 _M_limit(__pos, __n1), __s, __n2);
1584 }
1585
1586 /**
1587 * @brief Replace characters with value of a C string.
1588 * @param __pos Index of first character to replace.
1589 * @param __n1 Number of characters to be replaced.
1590 * @param __s C string to insert.
1591 * @return Reference to this string.
1592 * @throw std::out_of_range If @a pos > size().
1593 * @throw std::length_error If new length exceeds @c max_size().
1594 *
1595 * Removes the characters in the range [__pos,__pos + __n1)
1596 * from this string. In place, the characters of @a __s are
1597 * inserted. If @a __pos is beyond end of string, out_of_range
1598 * is thrown. If the length of result exceeds max_size(),
1599 * length_error is thrown. The value of the string doesn't
1600 * change if an error is thrown.
1601 */
1602 basic_string&
1603 replace(size_type __pos, size_type __n1, const _CharT* __s)
1604 {
1605 __glibcxx_requires_string(__s);
1606 return this->replace(__pos, __n1, __s, traits_type::length(__s));
1607 }
1608
1609 /**
1610 * @brief Replace characters with multiple characters.
1611 * @param __pos Index of first character to replace.
1612 * @param __n1 Number of characters to be replaced.
1613 * @param __n2 Number of characters to insert.
1614 * @param __c Character to insert.
1615 * @return Reference to this string.
1616 * @throw std::out_of_range If @a __pos > size().
1617 * @throw std::length_error If new length exceeds @c max_size().
1618 *
1619 * Removes the characters in the range [pos,pos + n1) from this
1620 * string. In place, @a __n2 copies of @a __c are inserted.
1621 * If @a __pos is beyond end of string, out_of_range is thrown.
1622 * If the length of result exceeds max_size(), length_error is
1623 * thrown. The value of the string doesn't change if an error
1624 * is thrown.
1625 */
1626 basic_string&
1627 replace(size_type __pos, size_type __n1, size_type __n2, _CharT __c)
1628 { return _M_replace_aux(_M_check(__pos, "basic_string::replace"),
1629 _M_limit(__pos, __n1), __n2, __c); }
1630
1631 /**
1632 * @brief Replace range of characters with string.
1633 * @param __i1 Iterator referencing start of range to replace.
1634 * @param __i2 Iterator referencing end of range to replace.
1635 * @param __str String value to insert.
1636 * @return Reference to this string.
1637 * @throw std::length_error If new length exceeds @c max_size().
1638 *
1639 * Removes the characters in the range [__i1,__i2). In place,
1640 * the value of @a __str is inserted. If the length of result
1641 * exceeds max_size(), length_error is thrown. The value of
1642 * the string doesn't change if an error is thrown.
1643 */
1644 basic_string&
1645 replace(__const_iterator __i1, __const_iterator __i2,
1646 const basic_string& __str)
1647 { return this->replace(__i1, __i2, __str._M_data(), __str.size()); }
1648
1649 /**
1650 * @brief Replace range of characters with C substring.
1651 * @param __i1 Iterator referencing start of range to replace.
1652 * @param __i2 Iterator referencing end of range to replace.
1653 * @param __s C string value to insert.
1654 * @param __n Number of characters from s to insert.
1655 * @return Reference to this string.
1656 * @throw std::length_error If new length exceeds @c max_size().
1657 *
1658 * Removes the characters in the range [__i1,__i2). In place,
1659 * the first @a __n characters of @a __s are inserted. If the
1660 * length of result exceeds max_size(), length_error is thrown.
1661 * The value of the string doesn't change if an error is
1662 * thrown.
1663 */
1664 basic_string&
1665 replace(__const_iterator __i1, __const_iterator __i2,
1666 const _CharT* __s, size_type __n)
1667 {
1668 _GLIBCXX_DEBUG_PEDASSERT(begin() <= __i1 && __i1 <= __i2
1669 && __i2 <= end());
1670 return this->replace(__i1 - begin(), __i2 - __i1, __s, __n);
1671 }
1672
1673 /**
1674 * @brief Replace range of characters with C string.
1675 * @param __i1 Iterator referencing start of range to replace.
1676 * @param __i2 Iterator referencing end of range to replace.
1677 * @param __s C string value to insert.
1678 * @return Reference to this string.
1679 * @throw std::length_error If new length exceeds @c max_size().
1680 *
1681 * Removes the characters in the range [__i1,__i2). In place,
1682 * the characters of @a __s are inserted. If the length of
1683 * result exceeds max_size(), length_error is thrown. The
1684 * value of the string doesn't change if an error is thrown.
1685 */
1686 basic_string&
1687 replace(__const_iterator __i1, __const_iterator __i2, const _CharT* __s)
1688 {
1689 __glibcxx_requires_string(__s);
1690 return this->replace(__i1, __i2, __s, traits_type::length(__s));
1691 }
1692
1693 /**
1694 * @brief Replace range of characters with multiple characters
1695 * @param __i1 Iterator referencing start of range to replace.
1696 * @param __i2 Iterator referencing end of range to replace.
1697 * @param __n Number of characters to insert.
1698 * @param __c Character to insert.
1699 * @return Reference to this string.
1700 * @throw std::length_error If new length exceeds @c max_size().
1701 *
1702 * Removes the characters in the range [__i1,__i2). In place,
1703 * @a __n copies of @a __c are inserted. If the length of
1704 * result exceeds max_size(), length_error is thrown. The
1705 * value of the string doesn't change if an error is thrown.
1706 */
1707 basic_string&
1708 replace(__const_iterator __i1, __const_iterator __i2, size_type __n,
1709 _CharT __c)
1710 {
1711 _GLIBCXX_DEBUG_PEDASSERT(begin() <= __i1 && __i1 <= __i2
1712 && __i2 <= end());
1713 return _M_replace_aux(__i1 - begin(), __i2 - __i1, __n, __c);
1714 }
1715
1716 /**
1717 * @brief Replace range of characters with range.
1718 * @param __i1 Iterator referencing start of range to replace.
1719 * @param __i2 Iterator referencing end of range to replace.
1720 * @param __k1 Iterator referencing start of range to insert.
1721 * @param __k2 Iterator referencing end of range to insert.
1722 * @return Reference to this string.
1723 * @throw std::length_error If new length exceeds @c max_size().
1724 *
1725 * Removes the characters in the range [__i1,__i2). In place,
1726 * characters in the range [__k1,__k2) are inserted. If the
1727 * length of result exceeds max_size(), length_error is thrown.
1728 * The value of the string doesn't change if an error is
1729 * thrown.
1730 */
1731#if __cplusplus >= 201103L
1732 template<class _InputIterator,
1733 typename = std::_RequireInputIter<_InputIterator>>
1734 basic_string&
1735 replace(const_iterator __i1, const_iterator __i2,
1736 _InputIterator __k1, _InputIterator __k2)
1737 {
1738 _GLIBCXX_DEBUG_PEDASSERT(begin() <= __i1 && __i1 <= __i2
1739 && __i2 <= end());
1740 __glibcxx_requires_valid_range(__k1, __k2);
1741 return this->_M_replace_dispatch(__i1, __i2, __k1, __k2,
1742 std::__false_type());
1743 }
1744#else
1745 template<class _InputIterator>
1746#ifdef _GLIBCXX_DISAMBIGUATE_REPLACE_INST
1747 typename __enable_if_not_native_iterator<_InputIterator>::__type
1748#else
1749 basic_string&
1750#endif
1751 replace(iterator __i1, iterator __i2,
1752 _InputIterator __k1, _InputIterator __k2)
1753 {
1754 _GLIBCXX_DEBUG_PEDASSERT(begin() <= __i1 && __i1 <= __i2
1755 && __i2 <= end());
1756 __glibcxx_requires_valid_range(__k1, __k2);
1757 typedef typename std::__is_integer<_InputIterator>::__type _Integral;
1758 return _M_replace_dispatch(__i1, __i2, __k1, __k2, _Integral());
1759 }
1760#endif
1761
1762 // Specializations for the common case of pointer and iterator:
1763 // useful to avoid the overhead of temporary buffering in _M_replace.
1764 basic_string&
1765 replace(__const_iterator __i1, __const_iterator __i2,
1766 _CharT* __k1, _CharT* __k2)
1767 {
1768 _GLIBCXX_DEBUG_PEDASSERT(begin() <= __i1 && __i1 <= __i2
1769 && __i2 <= end());
1770 __glibcxx_requires_valid_range(__k1, __k2);
1771 return this->replace(__i1 - begin(), __i2 - __i1,
1772 __k1, __k2 - __k1);
1773 }
1774
1775 basic_string&
1776 replace(__const_iterator __i1, __const_iterator __i2,
1777 const _CharT* __k1, const _CharT* __k2)
1778 {
1779 _GLIBCXX_DEBUG_PEDASSERT(begin() <= __i1 && __i1 <= __i2
1780 && __i2 <= end());
1781 __glibcxx_requires_valid_range(__k1, __k2);
1782 return this->replace(__i1 - begin(), __i2 - __i1,
1783 __k1, __k2 - __k1);
1784 }
1785
1786 basic_string&
1787 replace(__const_iterator __i1, __const_iterator __i2,
1788 iterator __k1, iterator __k2)
1789 {
1790 _GLIBCXX_DEBUG_PEDASSERT(begin() <= __i1 && __i1 <= __i2
1791 && __i2 <= end());
1792 __glibcxx_requires_valid_range(__k1, __k2);
1793 return this->replace(__i1 - begin(), __i2 - __i1,
1794 __k1.base(), __k2 - __k1);
1795 }
1796
1797 basic_string&
1798 replace(__const_iterator __i1, __const_iterator __i2,
1799 const_iterator __k1, const_iterator __k2)
1800 {
1801 _GLIBCXX_DEBUG_PEDASSERT(begin() <= __i1 && __i1 <= __i2
1802 && __i2 <= end());
1803 __glibcxx_requires_valid_range(__k1, __k2);
1804 return this->replace(__i1 - begin(), __i2 - __i1,
1805 __k1.base(), __k2 - __k1);
1806 }
1807
1808#if __cplusplus >= 201103L
1809 /**
1810 * @brief Replace range of characters with initializer_list.
1811 * @param __i1 Iterator referencing start of range to replace.
1812 * @param __i2 Iterator referencing end of range to replace.
1813 * @param __l The initializer_list of characters to insert.
1814 * @return Reference to this string.
1815 * @throw std::length_error If new length exceeds @c max_size().
1816 *
1817 * Removes the characters in the range [__i1,__i2). In place,
1818 * characters in the range [__k1,__k2) are inserted. If the
1819 * length of result exceeds max_size(), length_error is thrown.
1820 * The value of the string doesn't change if an error is
1821 * thrown.
1822 */
1823 basic_string& replace(const_iterator __i1, const_iterator __i2,
1824 initializer_list<_CharT> __l)
1825 { return this->replace(__i1, __i2, __l.begin(), __l.end()); }
1826#endif // C++11
1827
1828 private:
1829 template<class _Integer>
1830 basic_string&
1831 _M_replace_dispatch(const_iterator __i1, const_iterator __i2,
1832 _Integer __n, _Integer __val, __true_type)
1833 { return _M_replace_aux(__i1 - begin(), __i2 - __i1, __n, __val); }
1834
1835 template<class _InputIterator>
1836 basic_string&
1837 _M_replace_dispatch(const_iterator __i1, const_iterator __i2,
1838 _InputIterator __k1, _InputIterator __k2,
1839 __false_type);
1840
1841 basic_string&
1842 _M_replace_aux(size_type __pos1, size_type __n1, size_type __n2,
1843 _CharT __c);
1844
1845 basic_string&
1846 _M_replace(size_type __pos, size_type __len1, const _CharT* __s,
1847 const size_type __len2);
1848
1849 basic_string&
1850 _M_append(const _CharT* __s, size_type __n);
1851
1852 public:
1853
1854 /**
1855 * @brief Copy substring into C string.
1856 * @param __s C string to copy value into.
1857 * @param __n Number of characters to copy.
1858 * @param __pos Index of first character to copy.
1859 * @return Number of characters actually copied
1860 * @throw std::out_of_range If __pos > size().
1861 *
1862 * Copies up to @a __n characters starting at @a __pos into the
1863 * C string @a __s. If @a __pos is %greater than size(),
1864 * out_of_range is thrown.
1865 */
1866 size_type
1867 copy(_CharT* __s, size_type __n, size_type __pos = 0) const;
1868
1869 /**
1870 * @brief Swap contents with another string.
1871 * @param __s String to swap with.
1872 *
1873 * Exchanges the contents of this string with that of @a __s in constant
1874 * time.
1875 */
1876 void
1877 swap(basic_string& __s) _GLIBCXX_NOEXCEPT;
1878
1879 // String operations:
1880 /**
1881 * @brief Return const pointer to null-terminated contents.
1882 *
1883 * This is a handle to internal data. Do not modify or dire things may
1884 * happen.
1885 */
1886 const _CharT*
1887 c_str() const _GLIBCXX_NOEXCEPT
1888 { return _M_data(); }
1889
1890 /**
1891 * @brief Return const pointer to contents.
1892 *
1893 * This is a handle to internal data. Do not modify or dire things may
1894 * happen.
1895 */
1896 const _CharT*
1897 data() const _GLIBCXX_NOEXCEPT
1898 { return _M_data(); }
1899
1900 /**
1901 * @brief Return copy of allocator used to construct this string.
1902 */
1903 allocator_type
1904 get_allocator() const _GLIBCXX_NOEXCEPT
1905 { return _M_get_allocator(); }
1906
1907 /**
1908 * @brief Find position of a C substring.
1909 * @param __s C string to locate.
1910 * @param __pos Index of character to search from.
1911 * @param __n Number of characters from @a s to search for.
1912 * @return Index of start of first occurrence.
1913 *
1914 * Starting from @a __pos, searches forward for the first @a
1915 * __n characters in @a __s within this string. If found,
1916 * returns the index where it begins. If not found, returns
1917 * npos.
1918 */
1919 size_type
1920 find(const _CharT* __s, size_type __pos, size_type __n) const;
1921
1922 /**
1923 * @brief Find position of a string.
1924 * @param __str String to locate.
1925 * @param __pos Index of character to search from (default 0).
1926 * @return Index of start of first occurrence.
1927 *
1928 * Starting from @a __pos, searches forward for value of @a __str within
1929 * this string. If found, returns the index where it begins. If not
1930 * found, returns npos.
1931 */
1932 size_type
1933 find(const basic_string& __str, size_type __pos = 0) const
1934 _GLIBCXX_NOEXCEPT
1935 { return this->find(__str.data(), __pos, __str.size()); }
1936
1937 /**
1938 * @brief Find position of a C string.
1939 * @param __s C string to locate.
1940 * @param __pos Index of character to search from (default 0).
1941 * @return Index of start of first occurrence.
1942 *
1943 * Starting from @a __pos, searches forward for the value of @a
1944 * __s within this string. If found, returns the index where
1945 * it begins. If not found, returns npos.
1946 */
1947 size_type
1948 find(const _CharT* __s, size_type __pos = 0) const
1949 {
1950 __glibcxx_requires_string(__s);
1951 return this->find(__s, __pos, traits_type::length(__s));
1952 }
1953
1954 /**
1955 * @brief Find position of a character.
1956 * @param __c Character to locate.
1957 * @param __pos Index of character to search from (default 0).
1958 * @return Index of first occurrence.
1959 *
1960 * Starting from @a __pos, searches forward for @a __c within
1961 * this string. If found, returns the index where it was
1962 * found. If not found, returns npos.
1963 */
1964 size_type
1965 find(_CharT __c, size_type __pos = 0) const _GLIBCXX_NOEXCEPT;
1966
1967 /**
1968 * @brief Find last position of a string.
1969 * @param __str String to locate.
1970 * @param __pos Index of character to search back from (default end).
1971 * @return Index of start of last occurrence.
1972 *
1973 * Starting from @a __pos, searches backward for value of @a
1974 * __str within this string. If found, returns the index where
1975 * it begins. If not found, returns npos.
1976 */
1977 size_type
1978 rfind(const basic_string& __str, size_type __pos = npos) const
1979 _GLIBCXX_NOEXCEPT
1980 { return this->rfind(__str.data(), __pos, __str.size()); }
1981
1982 /**
1983 * @brief Find last position of a C substring.
1984 * @param __s C string to locate.
1985 * @param __pos Index of character to search back from.
1986 * @param __n Number of characters from s to search for.
1987 * @return Index of start of last occurrence.
1988 *
1989 * Starting from @a __pos, searches backward for the first @a
1990 * __n characters in @a __s within this string. If found,
1991 * returns the index where it begins. If not found, returns
1992 * npos.
1993 */
1994 size_type
1995 rfind(const _CharT* __s, size_type __pos, size_type __n) const;
1996
1997 /**
1998 * @brief Find last position of a C string.
1999 * @param __s C string to locate.
2000 * @param __pos Index of character to start search at (default end).
2001 * @return Index of start of last occurrence.
2002 *
2003 * Starting from @a __pos, searches backward for the value of
2004 * @a __s within this string. If found, returns the index
2005 * where it begins. If not found, returns npos.
2006 */
2007 size_type
2008 rfind(const _CharT* __s, size_type __pos = npos) const
2009 {
2010 __glibcxx_requires_string(__s);
2011 return this->rfind(__s, __pos, traits_type::length(__s));
2012 }
2013
2014 /**
2015 * @brief Find last position of a character.
2016 * @param __c Character to locate.
2017 * @param __pos Index of character to search back from (default end).
2018 * @return Index of last occurrence.
2019 *
2020 * Starting from @a __pos, searches backward for @a __c within
2021 * this string. If found, returns the index where it was
2022 * found. If not found, returns npos.
2023 */
2024 size_type
2025 rfind(_CharT __c, size_type __pos = npos) const _GLIBCXX_NOEXCEPT;
2026
2027 /**
2028 * @brief Find position of a character of string.
2029 * @param __str String containing characters to locate.
2030 * @param __pos Index of character to search from (default 0).
2031 * @return Index of first occurrence.
2032 *
2033 * Starting from @a __pos, searches forward for one of the
2034 * characters of @a __str within this string. If found,
2035 * returns the index where it was found. If not found, returns
2036 * npos.
2037 */
2038 size_type
2039 find_first_of(const basic_string& __str, size_type __pos = 0) const
2040 _GLIBCXX_NOEXCEPT
2041 { return this->find_first_of(__str.data(), __pos, __str.size()); }
2042
2043 /**
2044 * @brief Find position of a character of C substring.
2045 * @param __s String containing characters to locate.
2046 * @param __pos Index of character to search from.
2047 * @param __n Number of characters from s to search for.
2048 * @return Index of first occurrence.
2049 *
2050 * Starting from @a __pos, searches forward for one of the
2051 * first @a __n characters of @a __s within this string. If
2052 * found, returns the index where it was found. If not found,
2053 * returns npos.
2054 */
2055 size_type
2056 find_first_of(const _CharT* __s, size_type __pos, size_type __n) const;
2057
2058 /**
2059 * @brief Find position of a character of C string.
2060 * @param __s String containing characters to locate.
2061 * @param __pos Index of character to search from (default 0).
2062 * @return Index of first occurrence.
2063 *
2064 * Starting from @a __pos, searches forward for one of the
2065 * characters of @a __s within this string. If found, returns
2066 * the index where it was found. If not found, returns npos.
2067 */
2068 size_type
2069 find_first_of(const _CharT* __s, size_type __pos = 0) const
2070 {
2071 __glibcxx_requires_string(__s);
2072 return this->find_first_of(__s, __pos, traits_type::length(__s));
2073 }
2074
2075 /**
2076 * @brief Find position of a character.
2077 * @param __c Character to locate.
2078 * @param __pos Index of character to search from (default 0).
2079 * @return Index of first occurrence.
2080 *
2081 * Starting from @a __pos, searches forward for the character
2082 * @a __c within this string. If found, returns the index
2083 * where it was found. If not found, returns npos.
2084 *
2085 * Note: equivalent to find(__c, __pos).
2086 */
2087 size_type
2088 find_first_of(_CharT __c, size_type __pos = 0) const _GLIBCXX_NOEXCEPT
2089 { return this->find(__c, __pos); }
2090
2091 /**
2092 * @brief Find last position of a character of string.
2093 * @param __str String containing characters to locate.
2094 * @param __pos Index of character to search back from (default end).
2095 * @return Index of last occurrence.
2096 *
2097 * Starting from @a __pos, searches backward for one of the
2098 * characters of @a __str within this string. If found,
2099 * returns the index where it was found. If not found, returns
2100 * npos.
2101 */
2102 size_type
2103 find_last_of(const basic_string& __str, size_type __pos = npos) const
2104 _GLIBCXX_NOEXCEPT
2105 { return this->find_last_of(__str.data(), __pos, __str.size()); }
2106
2107 /**
2108 * @brief Find last position of a character of C substring.
2109 * @param __s C string containing characters to locate.
2110 * @param __pos Index of character to search back from.
2111 * @param __n Number of characters from s to search for.
2112 * @return Index of last occurrence.
2113 *
2114 * Starting from @a __pos, searches backward for one of the
2115 * first @a __n characters of @a __s within this string. If
2116 * found, returns the index where it was found. If not found,
2117 * returns npos.
2118 */
2119 size_type
2120 find_last_of(const _CharT* __s, size_type __pos, size_type __n) const;
2121
2122 /**
2123 * @brief Find last position of a character of C string.
2124 * @param __s C string containing characters to locate.
2125 * @param __pos Index of character to search back from (default end).
2126 * @return Index of last occurrence.
2127 *
2128 * Starting from @a __pos, searches backward for one of the
2129 * characters of @a __s within this string. If found, returns
2130 * the index where it was found. If not found, returns npos.
2131 */
2132 size_type
2133 find_last_of(const _CharT* __s, size_type __pos = npos) const
2134 {
2135 __glibcxx_requires_string(__s);
2136 return this->find_last_of(__s, __pos, traits_type::length(__s));
2137 }
2138
2139 /**
2140 * @brief Find last position of a character.
2141 * @param __c Character to locate.
2142 * @param __pos Index of character to search back from (default end).
2143 * @return Index of last occurrence.
2144 *
2145 * Starting from @a __pos, searches backward for @a __c within
2146 * this string. If found, returns the index where it was
2147 * found. If not found, returns npos.
2148 *
2149 * Note: equivalent to rfind(__c, __pos).
2150 */
2151 size_type
2152 find_last_of(_CharT __c, size_type __pos = npos) const _GLIBCXX_NOEXCEPT
2153 { return this->rfind(__c, __pos); }
2154
2155 /**
2156 * @brief Find position of a character not in string.
2157 * @param __str String containing characters to avoid.
2158 * @param __pos Index of character to search from (default 0).
2159 * @return Index of first occurrence.
2160 *
2161 * Starting from @a __pos, searches forward for a character not contained
2162 * in @a __str within this string. If found, returns the index where it
2163 * was found. If not found, returns npos.
2164 */
2165 size_type
2166 find_first_not_of(const basic_string& __str, size_type __pos = 0) const
2167 _GLIBCXX_NOEXCEPT
2168 { return this->find_first_not_of(__str.data(), __pos, __str.size()); }
2169
2170 /**
2171 * @brief Find position of a character not in C substring.
2172 * @param __s C string containing characters to avoid.
2173 * @param __pos Index of character to search from.
2174 * @param __n Number of characters from __s to consider.
2175 * @return Index of first occurrence.
2176 *
2177 * Starting from @a __pos, searches forward for a character not
2178 * contained in the first @a __n characters of @a __s within
2179 * this string. If found, returns the index where it was
2180 * found. If not found, returns npos.
2181 */
2182 size_type
2183 find_first_not_of(const _CharT* __s, size_type __pos,
2184 size_type __n) const;
2185
2186 /**
2187 * @brief Find position of a character not in C string.
2188 * @param __s C string containing characters to avoid.
2189 * @param __pos Index of character to search from (default 0).
2190 * @return Index of first occurrence.
2191 *
2192 * Starting from @a __pos, searches forward for a character not
2193 * contained in @a __s within this string. If found, returns
2194 * the index where it was found. If not found, returns npos.
2195 */
2196 size_type
2197 find_first_not_of(const _CharT* __s, size_type __pos = 0) const
2198 {
2199 __glibcxx_requires_string(__s);
2200 return this->find_first_not_of(__s, __pos, traits_type::length(__s));
2201 }
2202
2203 /**
2204 * @brief Find position of a different character.
2205 * @param __c Character to avoid.
2206 * @param __pos Index of character to search from (default 0).
2207 * @return Index of first occurrence.
2208 *
2209 * Starting from @a __pos, searches forward for a character
2210 * other than @a __c within this string. If found, returns the
2211 * index where it was found. If not found, returns npos.
2212 */
2213 size_type
2214 find_first_not_of(_CharT __c, size_type __pos = 0) const
2215 _GLIBCXX_NOEXCEPT;
2216
2217 /**
2218 * @brief Find last position of a character not in string.
2219 * @param __str String containing characters to avoid.
2220 * @param __pos Index of character to search back from (default end).
2221 * @return Index of last occurrence.
2222 *
2223 * Starting from @a __pos, searches backward for a character
2224 * not contained in @a __str within this string. If found,
2225 * returns the index where it was found. If not found, returns
2226 * npos.
2227 */
2228 size_type
2229 find_last_not_of(const basic_string& __str, size_type __pos = npos) const
2230 _GLIBCXX_NOEXCEPT
2231 { return this->find_last_not_of(__str.data(), __pos, __str.size()); }
2232
2233 /**
2234 * @brief Find last position of a character not in C substring.
2235 * @param __s C string containing characters to avoid.
2236 * @param __pos Index of character to search back from.
2237 * @param __n Number of characters from s to consider.
2238 * @return Index of last occurrence.
2239 *
2240 * Starting from @a __pos, searches backward for a character not
2241 * contained in the first @a __n characters of @a __s within this string.
2242 * If found, returns the index where it was found. If not found,
2243 * returns npos.
2244 */
2245 size_type
2246 find_last_not_of(const _CharT* __s, size_type __pos,
2247 size_type __n) const;
2248 /**
2249 * @brief Find last position of a character not in C string.
2250 * @param __s C string containing characters to avoid.
2251 * @param __pos Index of character to search back from (default end).
2252 * @return Index of last occurrence.
2253 *
2254 * Starting from @a __pos, searches backward for a character
2255 * not contained in @a __s within this string. If found,
2256 * returns the index where it was found. If not found, returns
2257 * npos.
2258 */
2259 size_type
2260 find_last_not_of(const _CharT* __s, size_type __pos = npos) const
2261 {
2262 __glibcxx_requires_string(__s);
2263 return this->find_last_not_of(__s, __pos, traits_type::length(__s));
2264 }
2265
2266 /**
2267 * @brief Find last position of a different character.
2268 * @param __c Character to avoid.
2269 * @param __pos Index of character to search back from (default end).
2270 * @return Index of last occurrence.
2271 *
2272 * Starting from @a __pos, searches backward for a character other than
2273 * @a __c within this string. If found, returns the index where it was
2274 * found. If not found, returns npos.
2275 */
2276 size_type
2277 find_last_not_of(_CharT __c, size_type __pos = npos) const
2278 _GLIBCXX_NOEXCEPT;
2279
2280 /**
2281 * @brief Get a substring.
2282 * @param __pos Index of first character (default 0).
2283 * @param __n Number of characters in substring (default remainder).
2284 * @return The new string.
2285 * @throw std::out_of_range If __pos > size().
2286 *
2287 * Construct and return a new string using the @a __n
2288 * characters starting at @a __pos. If the string is too
2289 * short, use the remainder of the characters. If @a __pos is
2290 * beyond the end of the string, out_of_range is thrown.
2291 */
2292 basic_string
2293 substr(size_type __pos = 0, size_type __n = npos) const
2294 { return basic_string(*this,
2295 _M_check(__pos, "basic_string::substr"), __n); }
2296
2297 /**
2298 * @brief Compare to a string.
2299 * @param __str String to compare against.
2300 * @return Integer < 0, 0, or > 0.
2301 *
2302 * Returns an integer < 0 if this string is ordered before @a
2303 * __str, 0 if their values are equivalent, or > 0 if this
2304 * string is ordered after @a __str. Determines the effective
2305 * length rlen of the strings to compare as the smallest of
2306 * size() and str.size(). The function then compares the two
2307 * strings by calling traits::compare(data(), str.data(),rlen).
2308 * If the result of the comparison is nonzero returns it,
2309 * otherwise the shorter one is ordered first.
2310 */
2311 int
2312 compare(const basic_string& __str) const
2313 {
2314 const size_type __size = this->size();
2315 const size_type __osize = __str.size();
2316 const size_type __len = std::min(__size, __osize);
2317
2318 int __r = traits_type::compare(_M_data(), __str.data(), __len);
2319 if (!__r)
2320 __r = _S_compare(__size, __osize);
2321 return __r;
2322 }
2323
2324 /**
2325 * @brief Compare substring to a string.
2326 * @param __pos Index of first character of substring.
2327 * @param __n Number of characters in substring.
2328 * @param __str String to compare against.
2329 * @return Integer < 0, 0, or > 0.
2330 *
2331 * Form the substring of this string from the @a __n characters
2332 * starting at @a __pos. Returns an integer < 0 if the
2333 * substring is ordered before @a __str, 0 if their values are
2334 * equivalent, or > 0 if the substring is ordered after @a
2335 * __str. Determines the effective length rlen of the strings
2336 * to compare as the smallest of the length of the substring
2337 * and @a __str.size(). The function then compares the two
2338 * strings by calling
2339 * traits::compare(substring.data(),str.data(),rlen). If the
2340 * result of the comparison is nonzero returns it, otherwise
2341 * the shorter one is ordered first.
2342 */
2343 int
2344 compare(size_type __pos, size_type __n, const basic_string& __str) const;
2345
2346 /**
2347 * @brief Compare substring to a substring.
2348 * @param __pos1 Index of first character of substring.
2349 * @param __n1 Number of characters in substring.
2350 * @param __str String to compare against.
2351 * @param __pos2 Index of first character of substring of str.
2352 * @param __n2 Number of characters in substring of str.
2353 * @return Integer < 0, 0, or > 0.
2354 *
2355 * Form the substring of this string from the @a __n1
2356 * characters starting at @a __pos1. Form the substring of @a
2357 * __str from the @a __n2 characters starting at @a __pos2.
2358 * Returns an integer < 0 if this substring is ordered before
2359 * the substring of @a __str, 0 if their values are equivalent,
2360 * or > 0 if this substring is ordered after the substring of
2361 * @a __str. Determines the effective length rlen of the
2362 * strings to compare as the smallest of the lengths of the
2363 * substrings. The function then compares the two strings by
2364 * calling
2365 * traits::compare(substring.data(),str.substr(pos2,n2).data(),rlen).
2366 * If the result of the comparison is nonzero returns it,
2367 * otherwise the shorter one is ordered first.
2368 */
2369 int
2370 compare(size_type __pos1, size_type __n1, const basic_string& __str,
2371 size_type __pos2, size_type __n2) const;
2372
2373 /**
2374 * @brief Compare to a C string.
2375 * @param __s C string to compare against.
2376 * @return Integer < 0, 0, or > 0.
2377 *
2378 * Returns an integer < 0 if this string is ordered before @a __s, 0 if
2379 * their values are equivalent, or > 0 if this string is ordered after
2380 * @a __s. Determines the effective length rlen of the strings to
2381 * compare as the smallest of size() and the length of a string
2382 * constructed from @a __s. The function then compares the two strings
2383 * by calling traits::compare(data(),s,rlen). If the result of the
2384 * comparison is nonzero returns it, otherwise the shorter one is
2385 * ordered first.
2386 */
2387 int
2388 compare(const _CharT* __s) const;
2389
2390 // _GLIBCXX_RESOLVE_LIB_DEFECTS
2391 // 5 String::compare specification questionable
2392 /**
2393 * @brief Compare substring to a C string.
2394 * @param __pos Index of first character of substring.
2395 * @param __n1 Number of characters in substring.
2396 * @param __s C string to compare against.
2397 * @return Integer < 0, 0, or > 0.
2398 *
2399 * Form the substring of this string from the @a __n1
2400 * characters starting at @a pos. Returns an integer < 0 if
2401 * the substring is ordered before @a __s, 0 if their values
2402 * are equivalent, or > 0 if the substring is ordered after @a
2403 * __s. Determines the effective length rlen of the strings to
2404 * compare as the smallest of the length of the substring and
2405 * the length of a string constructed from @a __s. The
2406 * function then compares the two string by calling
2407 * traits::compare(substring.data(),__s,rlen). If the result of
2408 * the comparison is nonzero returns it, otherwise the shorter
2409 * one is ordered first.
2410 */
2411 int
2412 compare(size_type __pos, size_type __n1, const _CharT* __s) const;
2413
2414 /**
2415 * @brief Compare substring against a character %array.
2416 * @param __pos Index of first character of substring.
2417 * @param __n1 Number of characters in substring.
2418 * @param __s character %array to compare against.
2419 * @param __n2 Number of characters of s.
2420 * @return Integer < 0, 0, or > 0.
2421 *
2422 * Form the substring of this string from the @a __n1
2423 * characters starting at @a __pos. Form a string from the
2424 * first @a __n2 characters of @a __s. Returns an integer < 0
2425 * if this substring is ordered before the string from @a __s,
2426 * 0 if their values are equivalent, or > 0 if this substring
2427 * is ordered after the string from @a __s. Determines the
2428 * effective length rlen of the strings to compare as the
2429 * smallest of the length of the substring and @a __n2. The
2430 * function then compares the two strings by calling
2431 * traits::compare(substring.data(),s,rlen). If the result of
2432 * the comparison is nonzero returns it, otherwise the shorter
2433 * one is ordered first.
2434 *
2435 * NB: s must have at least n2 characters, &apos;\\0&apos; has
2436 * no special meaning.
2437 */
2438 int
2439 compare(size_type __pos, size_type __n1, const _CharT* __s,
2440 size_type __n2) const;
2441 };
2442_GLIBCXX_END_NAMESPACE_CXX11
2443#else // !_GLIBCXX_USE_CXX11_ABI
2444 // Reference-counted COW string implentation
2445
2446 /**
2447 * @class basic_string basic_string.h <string>
2448 * @brief Managing sequences of characters and character-like objects.
2449 *
2450 * @ingroup strings
2451 * @ingroup sequences
2452 *
2453 * @tparam _CharT Type of character
2454 * @tparam _Traits Traits for character type, defaults to
2455 * char_traits<_CharT>.
2456 * @tparam _Alloc Allocator type, defaults to allocator<_CharT>.
2457 *
2458 * Meets the requirements of a <a href="tables.html#65">container</a>, a
2459 * <a href="tables.html#66">reversible container</a>, and a
2460 * <a href="tables.html#67">sequence</a>. Of the
2461 * <a href="tables.html#68">optional sequence requirements</a>, only
2462 * @c push_back, @c at, and @c %array access are supported.
2463 *
2464 * @doctodo
2465 *
2466 *
2467 * Documentation? What's that?
2468 * Nathan Myers <ncm@cantrip.org>.
2469 *
2470 * A string looks like this:
2471 *
2472 * @code
2473 * [_Rep]
2474 * _M_length
2475 * [basic_string<char_type>] _M_capacity
2476 * _M_dataplus _M_refcount
2477 * _M_p ----------------> unnamed array of char_type
2478 * @endcode
2479 *
2480 * Where the _M_p points to the first character in the string, and
2481 * you cast it to a pointer-to-_Rep and subtract 1 to get a
2482 * pointer to the header.
2483 *
2484 * This approach has the enormous advantage that a string object
2485 * requires only one allocation. All the ugliness is confined
2486 * within a single %pair of inline functions, which each compile to
2487 * a single @a add instruction: _Rep::_M_data(), and
2488 * string::_M_rep(); and the allocation function which gets a
2489 * block of raw bytes and with room enough and constructs a _Rep
2490 * object at the front.
2491 *
2492 * The reason you want _M_data pointing to the character %array and
2493 * not the _Rep is so that the debugger can see the string
2494 * contents. (Probably we should add a non-inline member to get
2495 * the _Rep for the debugger to use, so users can check the actual
2496 * string length.)
2497 *
2498 * Note that the _Rep object is a POD so that you can have a
2499 * static <em>empty string</em> _Rep object already @a constructed before
2500 * static constructors have run. The reference-count encoding is
2501 * chosen so that a 0 indicates one reference, so you never try to
2502 * destroy the empty-string _Rep object.
2503 *
2504 * All but the last paragraph is considered pretty conventional
2505 * for a C++ string implementation.
2506 */
2507 // 21.3 Template class basic_string
2508 template<typename _CharT, typename _Traits, typename _Alloc>
2509 class basic_string
2510 {
2511 typedef typename _Alloc::template rebind<_CharT>::other _CharT_alloc_type;
2512
2513 // Types:
2514 public:
2515 typedef _Traits traits_type;
2516 typedef typename _Traits::char_type value_type;
2517 typedef _Alloc allocator_type;
2518 typedef typename _CharT_alloc_type::size_type size_type;
2519 typedef typename _CharT_alloc_type::difference_type difference_type;
2520 typedef typename _CharT_alloc_type::reference reference;
2521 typedef typename _CharT_alloc_type::const_reference const_reference;
2522 typedef typename _CharT_alloc_type::pointer pointer;
2523 typedef typename _CharT_alloc_type::const_pointer const_pointer;
2524 typedef __gnu_cxx::__normal_iterator<pointer, basic_string> iterator;
2525 typedef __gnu_cxx::__normal_iterator<const_pointer, basic_string>
2526 const_iterator;
2527 typedef std::reverse_iterator<const_iterator> const_reverse_iterator;
2528 typedef std::reverse_iterator<iterator> reverse_iterator;
2529
2530 private:
2531 // _Rep: string representation
2532 // Invariants:
2533 // 1. String really contains _M_length + 1 characters: due to 21.3.4
2534 // must be kept null-terminated.
2535 // 2. _M_capacity >= _M_length
2536 // Allocated memory is always (_M_capacity + 1) * sizeof(_CharT).
2537 // 3. _M_refcount has three states:
2538 // -1: leaked, one reference, no ref-copies allowed, non-const.
2539 // 0: one reference, non-const.
2540 // n>0: n + 1 references, operations require a lock, const.
2541 // 4. All fields==0 is an empty string, given the extra storage
2542 // beyond-the-end for a null terminator; thus, the shared
2543 // empty string representation needs no constructor.
2544
2545 struct _Rep_base
2546 {
2547 size_type _M_length;
2548 size_type _M_capacity;
2549 _Atomic_word _M_refcount;
2550 };
2551
2552 struct _Rep : _Rep_base
2553 {
2554 // Types:
2555 typedef typename _Alloc::template rebind<char>::other _Raw_bytes_alloc;
2556
2557 // (Public) Data members:
2558
2559 // The maximum number of individual char_type elements of an
2560 // individual string is determined by _S_max_size. This is the
2561 // value that will be returned by max_size(). (Whereas npos
2562 // is the maximum number of bytes the allocator can allocate.)
2563 // If one was to divvy up the theoretical largest size string,
2564 // with a terminating character and m _CharT elements, it'd
2565 // look like this:
2566 // npos = sizeof(_Rep) + (m * sizeof(_CharT)) + sizeof(_CharT)
2567 // Solving for m:
2568 // m = ((npos - sizeof(_Rep))/sizeof(CharT)) - 1
2569 // In addition, this implementation quarters this amount.
2570 static const size_type _S_max_size;
2571 static const _CharT _S_terminal;
2572
2573 // The following storage is init'd to 0 by the linker, resulting
2574 // (carefully) in an empty string with one reference.
2575 static size_type _S_empty_rep_storage[];
2576
2577 static _Rep&
2578 _S_empty_rep() _GLIBCXX_NOEXCEPT
2579 {
2580 // NB: Mild hack to avoid strict-aliasing warnings. Note that
2581 // _S_empty_rep_storage is never modified and the punning should
2582 // be reasonably safe in this case.
2583 void* __p = reinterpret_cast<void*>(&_S_empty_rep_storage);
2584 return *reinterpret_cast<_Rep*>(__p);
2585 }
2586
2587 bool
2588 _M_is_leaked() const _GLIBCXX_NOEXCEPT
2589 { return this->_M_refcount < 0; }
2590
2591 bool
2592 _M_is_shared() const _GLIBCXX_NOEXCEPT
2593 { return this->_M_refcount > 0; }
2594
2595 void
2596 _M_set_leaked() _GLIBCXX_NOEXCEPT
2597 { this->_M_refcount = -1; }
2598
2599 void
2600 _M_set_sharable() _GLIBCXX_NOEXCEPT
2601 { this->_M_refcount = 0; }
2602
2603 void
2604 _M_set_length_and_sharable(size_type __n) _GLIBCXX_NOEXCEPT
2605 {
2606#if _GLIBCXX_FULLY_DYNAMIC_STRING == 0
2607 if (__builtin_expect(this != &_S_empty_rep(), false))
2608#endif
2609 {
2610 this->_M_set_sharable(); // One reference.
2611 this->_M_length = __n;
2612 traits_type::assign(this->_M_refdata()[__n], _S_terminal);
2613 // grrr. (per 21.3.4)
2614 // You cannot leave those LWG people alone for a second.
2615 }
2616 }
2617
2618 _CharT*
2619 _M_refdata() throw()
2620 { return reinterpret_cast<_CharT*>(this + 1); }
2621
2622 _CharT*
2623 _M_grab(const _Alloc& __alloc1, const _Alloc& __alloc2)
2624 {
2625 return (!_M_is_leaked() && __alloc1 == __alloc2)
2626 ? _M_refcopy() : _M_clone(__alloc1);
2627 }
2628
2629 // Create & Destroy
2630 static _Rep*
2631 _S_create(size_type, size_type, const _Alloc&);
2632
2633 void
2634 _M_dispose(const _Alloc& __a) _GLIBCXX_NOEXCEPT
2635 {
2636#if _GLIBCXX_FULLY_DYNAMIC_STRING == 0
2637 if (__builtin_expect(this != &_S_empty_rep(), false))
2638#endif
2639 {
2640 // Be race-detector-friendly. For more info see bits/c++config.
2641 _GLIBCXX_SYNCHRONIZATION_HAPPENS_BEFORE(&this->_M_refcount);
2642 if (__gnu_cxx::__exchange_and_add_dispatch(&this->_M_refcount,
2643 -1) <= 0)
2644 {
2645 _GLIBCXX_SYNCHRONIZATION_HAPPENS_AFTER(&this->_M_refcount);
2646 _M_destroy(__a);
2647 }
2648 }
2649 } // XXX MT
2650
2651 void
2652 _M_destroy(const _Alloc&) throw();
2653
2654 _CharT*
2655 _M_refcopy() throw()
2656 {
2657#if _GLIBCXX_FULLY_DYNAMIC_STRING == 0
2658 if (__builtin_expect(this != &_S_empty_rep(), false))
2659#endif
2660 __gnu_cxx::__atomic_add_dispatch(&this->_M_refcount, 1);
2661 return _M_refdata();
2662 } // XXX MT
2663
2664 _CharT*
2665 _M_clone(const _Alloc&, size_type __res = 0);
2666 };
2667
2668 // Use empty-base optimization: http://www.cantrip.org/emptyopt.html
2669 struct _Alloc_hider : _Alloc
2670 {
2671 _Alloc_hider(_CharT* __dat, const _Alloc& __a) _GLIBCXX_NOEXCEPT
2672 : _Alloc(__a), _M_p(__dat) { }
2673
2674 _CharT* _M_p; // The actual data.
2675 };
2676
2677 public:
2678 // Data Members (public):
2679 // NB: This is an unsigned type, and thus represents the maximum
2680 // size that the allocator can hold.
2681 /// Value returned by various member functions when they fail.
2682 static const size_type npos = static_cast<size_type>(-1);
2683
2684 private:
2685 // Data Members (private):
2686 mutable _Alloc_hider _M_dataplus;
2687
2688 _CharT*
2689 _M_data() const _GLIBCXX_NOEXCEPT
2690 { return _M_dataplus._M_p; }
2691
2692 _CharT*
2693 _M_data(_CharT* __p) _GLIBCXX_NOEXCEPT
2694 { return (_M_dataplus._M_p = __p); }
2695
2696 _Rep*
2697 _M_rep() const _GLIBCXX_NOEXCEPT
2698 { return &((reinterpret_cast<_Rep*> (_M_data()))[-1]); }
2699
2700 // For the internal use we have functions similar to `begin'/`end'
2701 // but they do not call _M_leak.
2702 iterator
2703 _M_ibegin() const _GLIBCXX_NOEXCEPT
2704 { return iterator(_M_data()); }
2705
2706 iterator
2707 _M_iend() const _GLIBCXX_NOEXCEPT
2708 { return iterator(_M_data() + this->size()); }
2709
2710 void
2711 _M_leak() // for use in begin() & non-const op[]
2712 {
2713 if (!_M_rep()->_M_is_leaked())
2714 _M_leak_hard();
2715 }
2716
2717 size_type
2718 _M_check(size_type __pos, const char* __s) const
2719 {
2720 if (__pos > this->size())
2721 __throw_out_of_range_fmt(__N("%s: __pos (which is %zu) > "
2722 "this->size() (which is %zu)"),
2723 __s, __pos, this->size());
2724 return __pos;
2725 }
2726
2727 void
2728 _M_check_length(size_type __n1, size_type __n2, const char* __s) const
2729 {
2730 if (this->max_size() - (this->size() - __n1) < __n2)
2731 __throw_length_error(__N(__s));
2732 }
2733
2734 // NB: _M_limit doesn't check for a bad __pos value.
2735 size_type
2736 _M_limit(size_type __pos, size_type __off) const _GLIBCXX_NOEXCEPT
2737 {
2738 const bool __testoff = __off < this->size() - __pos;
2739 return __testoff ? __off : this->size() - __pos;
2740 }
2741
2742 // True if _Rep and source do not overlap.
2743 bool
2744 _M_disjunct(const _CharT* __s) const _GLIBCXX_NOEXCEPT
2745 {
2746 return (less<const _CharT*>()(__s, _M_data())
2747 || less<const _CharT*>()(_M_data() + this->size(), __s));
2748 }
2749
2750 // When __n = 1 way faster than the general multichar
2751 // traits_type::copy/move/assign.
2752 static void
2753 _M_copy(_CharT* __d, const _CharT* __s, size_type __n) _GLIBCXX_NOEXCEPT
2754 {
2755 if (__n == 1)
2756 traits_type::assign(*__d, *__s);
2757 else
2758 traits_type::copy(__d, __s, __n);
2759 }
2760
2761 static void
2762 _M_move(_CharT* __d, const _CharT* __s, size_type __n) _GLIBCXX_NOEXCEPT
2763 {
2764 if (__n == 1)
2765 traits_type::assign(*__d, *__s);
2766 else
2767 traits_type::move(__d, __s, __n);
2768 }
2769
2770 static void
2771 _M_assign(_CharT* __d, size_type __n, _CharT __c) _GLIBCXX_NOEXCEPT
2772 {
2773 if (__n == 1)
2774 traits_type::assign(*__d, __c);
2775 else
2776 traits_type::assign(__d, __n, __c);
2777 }
2778
2779 // _S_copy_chars is a separate template to permit specialization
2780 // to optimize for the common case of pointers as iterators.
2781 template<class _Iterator>
2782 static void
2783 _S_copy_chars(_CharT* __p, _Iterator __k1, _Iterator __k2)
2784 {
2785 for (; __k1 != __k2; ++__k1, ++__p)
2786 traits_type::assign(*__p, *__k1); // These types are off.
2787 }
2788
2789 static void
2790 _S_copy_chars(_CharT* __p, iterator __k1, iterator __k2) _GLIBCXX_NOEXCEPT
2791 { _S_copy_chars(__p, __k1.base(), __k2.base()); }
2792
2793 static void
2794 _S_copy_chars(_CharT* __p, const_iterator __k1, const_iterator __k2)
2795 _GLIBCXX_NOEXCEPT
2796 { _S_copy_chars(__p, __k1.base(), __k2.base()); }
2797
2798 static void
2799 _S_copy_chars(_CharT* __p, _CharT* __k1, _CharT* __k2) _GLIBCXX_NOEXCEPT
2800 { _M_copy(__p, __k1, __k2 - __k1); }
2801
2802 static void
2803 _S_copy_chars(_CharT* __p, const _CharT* __k1, const _CharT* __k2)
2804 _GLIBCXX_NOEXCEPT
2805 { _M_copy(__p, __k1, __k2 - __k1); }
2806
2807 static int
2808 _S_compare(size_type __n1, size_type __n2) _GLIBCXX_NOEXCEPT
2809 {
2810 const difference_type __d = difference_type(__n1 - __n2);
2811
2812 if (__d > __gnu_cxx::__numeric_traits<int>::__max)
2813 return __gnu_cxx::__numeric_traits<int>::__max;
2814 else if (__d < __gnu_cxx::__numeric_traits<int>::__min)
2815 return __gnu_cxx::__numeric_traits<int>::__min;
2816 else
2817 return int(__d);
2818 }
2819
2820 void
2821 _M_mutate(size_type __pos, size_type __len1, size_type __len2);
2822
2823 void
2824 _M_leak_hard();
2825
2826 static _Rep&
2827 _S_empty_rep() _GLIBCXX_NOEXCEPT
2828 { return _Rep::_S_empty_rep(); }
2829
2830 public:
2831 // Construct/copy/destroy:
2832 // NB: We overload ctors in some cases instead of using default
2833 // arguments, per 17.4.4.4 para. 2 item 2.
2834
2835 /**
2836 * @brief Default constructor creates an empty string.
2837 */
2838 basic_string()
2839#if _GLIBCXX_FULLY_DYNAMIC_STRING == 0
2840 : _M_dataplus(_S_empty_rep()._M_refdata(), _Alloc()) { }
2841#else
2842 : _M_dataplus(_S_construct(size_type(), _CharT(), _Alloc()), _Alloc()){ }
2843#endif
2844
2845 /**
2846 * @brief Construct an empty string using allocator @a a.
2847 */
2848 explicit
2849 basic_string(const _Alloc& __a);
2850
2851 // NB: per LWG issue 42, semantics different from IS:
2852 /**
2853 * @brief Construct string with copy of value of @a str.
2854 * @param __str Source string.
2855 */
2856 basic_string(const basic_string& __str);
2857 /**
2858 * @brief Construct string as copy of a substring.
2859 * @param __str Source string.
2860 * @param __pos Index of first character to copy from.
2861 * @param __n Number of characters to copy (default remainder).
2862 */
2863 basic_string(const basic_string& __str, size_type __pos,
2864 size_type __n = npos);
2865 /**
2866 * @brief Construct string as copy of a substring.
2867 * @param __str Source string.
2868 * @param __pos Index of first character to copy from.
2869 * @param __n Number of characters to copy.
2870 * @param __a Allocator to use.
2871 */
2872 basic_string(const basic_string& __str, size_type __pos,
2873 size_type __n, const _Alloc& __a);
2874
2875 /**
2876 * @brief Construct string initialized by a character %array.
2877 * @param __s Source character %array.
2878 * @param __n Number of characters to copy.
2879 * @param __a Allocator to use (default is default allocator).
2880 *
2881 * NB: @a __s must have at least @a __n characters, &apos;\\0&apos;
2882 * has no special meaning.
2883 */
2884 basic_string(const _CharT* __s, size_type __n,
2885 const _Alloc& __a = _Alloc());
2886 /**
2887 * @brief Construct string as copy of a C string.
2888 * @param __s Source C string.
2889 * @param __a Allocator to use (default is default allocator).
2890 */
2891 basic_string(const _CharT* __s, const _Alloc& __a = _Alloc());
2892 /**
2893 * @brief Construct string as multiple characters.
2894 * @param __n Number of characters.
2895 * @param __c Character to use.
2896 * @param __a Allocator to use (default is default allocator).
2897 */
2898 basic_string(size_type __n, _CharT __c, const _Alloc& __a = _Alloc());
2899
2900#if __cplusplus >= 201103L
2901 /**
2902 * @brief Move construct string.
2903 * @param __str Source string.
2904 *
2905 * The newly-created string contains the exact contents of @a __str.
2906 * @a __str is a valid, but unspecified string.
2907 **/
2908 basic_string(basic_string&& __str)
2909#if _GLIBCXX_FULLY_DYNAMIC_STRING == 0
2910 noexcept // FIXME C++11: should always be noexcept.
2911#endif
2912 : _M_dataplus(__str._M_dataplus)
2913 {
2914#if _GLIBCXX_FULLY_DYNAMIC_STRING == 0
2915 __str._M_data(_S_empty_rep()._M_refdata());
2916#else
2917 __str._M_data(_S_construct(size_type(), _CharT(), get_allocator()));
2918#endif
2919 }
2920
2921 /**
2922 * @brief Construct string from an initializer %list.
2923 * @param __l std::initializer_list of characters.
2924 * @param __a Allocator to use (default is default allocator).
2925 */
2926 basic_string(initializer_list<_CharT> __l, const _Alloc& __a = _Alloc());
2927#endif // C++11
2928
2929 /**
2930 * @brief Construct string as copy of a range.
2931 * @param __beg Start of range.
2932 * @param __end End of range.
2933 * @param __a Allocator to use (default is default allocator).
2934 */
2935 template<class _InputIterator>
2936 basic_string(_InputIterator __beg, _InputIterator __end,
2937 const _Alloc& __a = _Alloc());
2938
2939 /**
2940 * @brief Destroy the string instance.
2941 */
2942 ~basic_string() _GLIBCXX_NOEXCEPT
2943 { _M_rep()->_M_dispose(this->get_allocator()); }
2944
2945 /**
2946 * @brief Assign the value of @a str to this string.
2947 * @param __str Source string.
2948 */
2949 basic_string&
2950 operator=(const basic_string& __str)
2951 { return this->assign(__str); }
2952
2953 /**
2954 * @brief Copy contents of @a s into this string.
2955 * @param __s Source null-terminated string.
2956 */
2957 basic_string&
2958 operator=(const _CharT* __s)
2959 { return this->assign(__s); }
2960
2961 /**
2962 * @brief Set value to string of length 1.
2963 * @param __c Source character.
2964 *
2965 * Assigning to a character makes this string length 1 and
2966 * (*this)[0] == @a c.
2967 */
2968 basic_string&
2969 operator=(_CharT __c)
2970 {
2971 this->assign(1, __c);
2972 return *this;
2973 }
2974
2975#if __cplusplus >= 201103L
2976 /**
2977 * @brief Move assign the value of @a str to this string.
2978 * @param __str Source string.
2979 *
2980 * The contents of @a str are moved into this string (without copying).
2981 * @a str is a valid, but unspecified string.
2982 **/
2983 // PR 58265, this should be noexcept.
2984 basic_string&
2985 operator=(basic_string&& __str)
2986 {
2987 // NB: DR 1204.
2988 this->swap(__str);
2989 return *this;
2990 }
2991
2992 /**
2993 * @brief Set value to string constructed from initializer %list.
2994 * @param __l std::initializer_list.
2995 */
2996 basic_string&
2997 operator=(initializer_list<_CharT> __l)
2998 {
2999 this->assign(__l.begin(), __l.size());
3000 return *this;
3001 }
3002#endif // C++11
3003
3004 // Iterators:
3005 /**
3006 * Returns a read/write iterator that points to the first character in
3007 * the %string. Unshares the string.
3008 */
3009 iterator
3010 begin() // FIXME C++11: should be noexcept.
3011 {
3012 _M_leak();
3013 return iterator(_M_data());
3014 }
3015
3016 /**
3017 * Returns a read-only (constant) iterator that points to the first
3018 * character in the %string.
3019 */
3020 const_iterator
3021 begin() const _GLIBCXX_NOEXCEPT
3022 { return const_iterator(_M_data()); }
3023
3024 /**
3025 * Returns a read/write iterator that points one past the last
3026 * character in the %string. Unshares the string.
3027 */
3028 iterator
3029 end() // FIXME C++11: should be noexcept.
3030 {
3031 _M_leak();
3032 return iterator(_M_data() + this->size());
3033 }
3034
3035 /**
3036 * Returns a read-only (constant) iterator that points one past the
3037 * last character in the %string.
3038 */
3039 const_iterator
3040 end() const _GLIBCXX_NOEXCEPT
3041 { return const_iterator(_M_data() + this->size()); }
3042
3043 /**
3044 * Returns a read/write reverse iterator that points to the last
3045 * character in the %string. Iteration is done in reverse element
3046 * order. Unshares the string.
3047 */
3048 reverse_iterator
3049 rbegin() // FIXME C++11: should be noexcept.
3050 { return reverse_iterator(this->end()); }
3051
3052 /**
3053 * Returns a read-only (constant) reverse iterator that points
3054 * to the last character in the %string. Iteration is done in
3055 * reverse element order.
3056 */
3057 const_reverse_iterator
3058 rbegin() const _GLIBCXX_NOEXCEPT
3059 { return const_reverse_iterator(this->end()); }
3060
3061 /**
3062 * Returns a read/write reverse iterator that points to one before the
3063 * first character in the %string. Iteration is done in reverse
3064 * element order. Unshares the string.
3065 */
3066 reverse_iterator
3067 rend() // FIXME C++11: should be noexcept.
3068 { return reverse_iterator(this->begin()); }
3069
3070 /**
3071 * Returns a read-only (constant) reverse iterator that points
3072 * to one before the first character in the %string. Iteration
3073 * is done in reverse element order.
3074 */
3075 const_reverse_iterator
3076 rend() const _GLIBCXX_NOEXCEPT
3077 { return const_reverse_iterator(this->begin()); }
3078
3079#if __cplusplus >= 201103L
3080 /**
3081 * Returns a read-only (constant) iterator that points to the first
3082 * character in the %string.
3083 */
3084 const_iterator
3085 cbegin() const noexcept
3086 { return const_iterator(this->_M_data()); }
3087
3088 /**
3089 * Returns a read-only (constant) iterator that points one past the
3090 * last character in the %string.
3091 */
3092 const_iterator
3093 cend() const noexcept
3094 { return const_iterator(this->_M_data() + this->size()); }
3095
3096 /**
3097 * Returns a read-only (constant) reverse iterator that points
3098 * to the last character in the %string. Iteration is done in
3099 * reverse element order.
3100 */
3101 const_reverse_iterator
3102 crbegin() const noexcept
3103 { return const_reverse_iterator(this->end()); }
3104
3105 /**
3106 * Returns a read-only (constant) reverse iterator that points
3107 * to one before the first character in the %string. Iteration
3108 * is done in reverse element order.
3109 */
3110 const_reverse_iterator
3111 crend() const noexcept
3112 { return const_reverse_iterator(this->begin()); }
3113#endif
3114
3115 public:
3116 // Capacity:
3117 /// Returns the number of characters in the string, not including any
3118 /// null-termination.
3119 size_type
3120 size() const _GLIBCXX_NOEXCEPT
3121 { return _M_rep()->_M_length; }
3122
3123 /// Returns the number of characters in the string, not including any
3124 /// null-termination.
3125 size_type
3126 length() const _GLIBCXX_NOEXCEPT
3127 { return _M_rep()->_M_length; }
3128
3129 /// Returns the size() of the largest possible %string.
3130 size_type
3131 max_size() const _GLIBCXX_NOEXCEPT
3132 { return _Rep::_S_max_size; }
3133
3134 /**
3135 * @brief Resizes the %string to the specified number of characters.
3136 * @param __n Number of characters the %string should contain.
3137 * @param __c Character to fill any new elements.
3138 *
3139 * This function will %resize the %string to the specified
3140 * number of characters. If the number is smaller than the
3141 * %string's current size the %string is truncated, otherwise
3142 * the %string is extended and new elements are %set to @a __c.
3143 */
3144 void
3145 resize(size_type __n, _CharT __c);
3146
3147 /**
3148 * @brief Resizes the %string to the specified number of characters.
3149 * @param __n Number of characters the %string should contain.
3150 *
3151 * This function will resize the %string to the specified length. If
3152 * the new size is smaller than the %string's current size the %string
3153 * is truncated, otherwise the %string is extended and new characters
3154 * are default-constructed. For basic types such as char, this means
3155 * setting them to 0.
3156 */
3157 void
3158 resize(size_type __n)
3159 { this->resize(__n, _CharT()); }
3160
3161#if __cplusplus >= 201103L
3162 /// A non-binding request to reduce capacity() to size().
3163 void
3164 shrink_to_fit() _GLIBCXX_NOEXCEPT
3165 {
3166#if __cpp_exceptions
3167 if (capacity() > size())
3168 {
3169 try
3170 { reserve(0); }
3171 catch(...)
3172 { }
3173 }
3174#endif
3175 }
3176#endif
3177
3178 /**
3179 * Returns the total number of characters that the %string can hold
3180 * before needing to allocate more memory.
3181 */
3182 size_type
3183 capacity() const _GLIBCXX_NOEXCEPT
3184 { return _M_rep()->_M_capacity; }
3185
3186 /**
3187 * @brief Attempt to preallocate enough memory for specified number of
3188 * characters.
3189 * @param __res_arg Number of characters required.
3190 * @throw std::length_error If @a __res_arg exceeds @c max_size().
3191 *
3192 * This function attempts to reserve enough memory for the
3193 * %string to hold the specified number of characters. If the
3194 * number requested is more than max_size(), length_error is
3195 * thrown.
3196 *
3197 * The advantage of this function is that if optimal code is a
3198 * necessity and the user can determine the string length that will be
3199 * required, the user can reserve the memory in %advance, and thus
3200 * prevent a possible reallocation of memory and copying of %string
3201 * data.
3202 */
3203 void
3204 reserve(size_type __res_arg = 0);
3205
3206 /**
3207 * Erases the string, making it empty.
3208 */
3209 // PR 56166: this should not throw.
3210 void
3211 clear()
3212 { _M_mutate(0, this->size(), 0); }
3213
3214 /**
3215 * Returns true if the %string is empty. Equivalent to
3216 * <code>*this == ""</code>.
3217 */
3218 bool
3219 empty() const _GLIBCXX_NOEXCEPT
3220 { return this->size() == 0; }
3221
3222 // Element access:
3223 /**
3224 * @brief Subscript access to the data contained in the %string.
3225 * @param __pos The index of the character to access.
3226 * @return Read-only (constant) reference to the character.
3227 *
3228 * This operator allows for easy, array-style, data access.
3229 * Note that data access with this operator is unchecked and
3230 * out_of_range lookups are not defined. (For checked lookups
3231 * see at().)
3232 */
3233 const_reference
3234 operator[] (size_type __pos) const _GLIBCXX_NOEXCEPT
3235 {
3236 _GLIBCXX_DEBUG_ASSERT(__pos <= size());
3237 return _M_data()[__pos];
3238 }
3239
3240 /**
3241 * @brief Subscript access to the data contained in the %string.
3242 * @param __pos The index of the character to access.
3243 * @return Read/write reference to the character.
3244 *
3245 * This operator allows for easy, array-style, data access.
3246 * Note that data access with this operator is unchecked and
3247 * out_of_range lookups are not defined. (For checked lookups
3248 * see at().) Unshares the string.
3249 */
3250 reference
3251 operator[](size_type __pos)
3252 {
3253 // Allow pos == size() both in C++98 mode, as v3 extension,
3254 // and in C++11 mode.
3255 _GLIBCXX_DEBUG_ASSERT(__pos <= size());
3256 // In pedantic mode be strict in C++98 mode.
3257 _GLIBCXX_DEBUG_PEDASSERT(__cplusplus >= 201103L || __pos < size());
3258 _M_leak();
3259 return _M_data()[__pos];
3260 }
3261
3262 /**
3263 * @brief Provides access to the data contained in the %string.
3264 * @param __n The index of the character to access.
3265 * @return Read-only (const) reference to the character.
3266 * @throw std::out_of_range If @a n is an invalid index.
3267 *
3268 * This function provides for safer data access. The parameter is
3269 * first checked that it is in the range of the string. The function
3270 * throws out_of_range if the check fails.
3271 */
3272 const_reference
3273 at(size_type __n) const
3274 {
3275 if (__n >= this->size())
3276 __throw_out_of_range_fmt(__N("basic_string::at: __n "
3277 "(which is %zu) >= this->size() "
3278 "(which is %zu)"),
3279 __n, this->size());
3280 return _M_data()[__n];
3281 }
3282
3283 /**
3284 * @brief Provides access to the data contained in the %string.
3285 * @param __n The index of the character to access.
3286 * @return Read/write reference to the character.
3287 * @throw std::out_of_range If @a n is an invalid index.
3288 *
3289 * This function provides for safer data access. The parameter is
3290 * first checked that it is in the range of the string. The function
3291 * throws out_of_range if the check fails. Success results in
3292 * unsharing the string.
3293 */
3294 reference
3295 at(size_type __n)
3296 {
3297 if (__n >= size())
3298 __throw_out_of_range_fmt(__N("basic_string::at: __n "
3299 "(which is %zu) >= this->size() "
3300 "(which is %zu)"),
3301 __n, this->size());
3302 _M_leak();
3303 return _M_data()[__n];
3304 }
3305
3306#if __cplusplus >= 201103L
3307 /**
3308 * Returns a read/write reference to the data at the first
3309 * element of the %string.
3310 */
3311 reference
3312 front()
3313 { return operator[](0); }
3314
3315 /**
3316 * Returns a read-only (constant) reference to the data at the first
3317 * element of the %string.
3318 */
3319 const_reference
3320 front() const _GLIBCXX_NOEXCEPT
3321 { return operator[](0); }
3322
3323 /**
3324 * Returns a read/write reference to the data at the last
3325 * element of the %string.
3326 */
3327 reference
3328 back()
3329 { return operator[](this->size() - 1); }
3330
3331 /**
3332 * Returns a read-only (constant) reference to the data at the
3333 * last element of the %string.
3334 */
3335 const_reference
3336 back() const _GLIBCXX_NOEXCEPT
3337 { return operator[](this->size() - 1); }
3338#endif
3339
3340 // Modifiers:
3341 /**
3342 * @brief Append a string to this string.
3343 * @param __str The string to append.
3344 * @return Reference to this string.
3345 */
3346 basic_string&
3347 operator+=(const basic_string& __str)
3348 { return this->append(__str); }
3349
3350 /**
3351 * @brief Append a C string.
3352 * @param __s The C string to append.
3353 * @return Reference to this string.
3354 */
3355 basic_string&
3356 operator+=(const _CharT* __s)
3357 { return this->append(__s); }
3358
3359 /**
3360 * @brief Append a character.
3361 * @param __c The character to append.
3362 * @return Reference to this string.
3363 */
3364 basic_string&
3365 operator+=(_CharT __c)
3366 {
3367 this->push_back(__c);
3368 return *this;
3369 }
3370
3371#if __cplusplus >= 201103L
3372 /**
3373 * @brief Append an initializer_list of characters.
3374 * @param __l The initializer_list of characters to be appended.
3375 * @return Reference to this string.
3376 */
3377 basic_string&
3378 operator+=(initializer_list<_CharT> __l)
3379 { return this->append(__l.begin(), __l.size()); }
3380#endif // C++11
3381
3382 /**
3383 * @brief Append a string to this string.
3384 * @param __str The string to append.
3385 * @return Reference to this string.
3386 */
3387 basic_string&
3388 append(const basic_string& __str);
3389
3390 /**
3391 * @brief Append a substring.
3392 * @param __str The string to append.
3393 * @param __pos Index of the first character of str to append.
3394 * @param __n The number of characters to append.
3395 * @return Reference to this string.
3396 * @throw std::out_of_range if @a __pos is not a valid index.
3397 *
3398 * This function appends @a __n characters from @a __str
3399 * starting at @a __pos to this string. If @a __n is is larger
3400 * than the number of available characters in @a __str, the
3401 * remainder of @a __str is appended.
3402 */
3403 basic_string&
3404 append(const basic_string& __str, size_type __pos, size_type __n);
3405
3406 /**
3407 * @brief Append a C substring.
3408 * @param __s The C string to append.
3409 * @param __n The number of characters to append.
3410 * @return Reference to this string.
3411 */
3412 basic_string&
3413 append(const _CharT* __s, size_type __n);
3414
3415 /**
3416 * @brief Append a C string.
3417 * @param __s The C string to append.
3418 * @return Reference to this string.
3419 */
3420 basic_string&
3421 append(const _CharT* __s)
3422 {
3423 __glibcxx_requires_string(__s);
3424 return this->append(__s, traits_type::length(__s));
3425 }
3426
3427 /**
3428 * @brief Append multiple characters.
3429 * @param __n The number of characters to append.
3430 * @param __c The character to use.
3431 * @return Reference to this string.
3432 *
3433 * Appends __n copies of __c to this string.
3434 */
3435 basic_string&
3436 append(size_type __n, _CharT __c);
3437
3438#if __cplusplus >= 201103L
3439 /**
3440 * @brief Append an initializer_list of characters.
3441 * @param __l The initializer_list of characters to append.
3442 * @return Reference to this string.
3443 */
3444 basic_string&
3445 append(initializer_list<_CharT> __l)
3446 { return this->append(__l.begin(), __l.size()); }
3447#endif // C++11
3448
3449 /**
3450 * @brief Append a range of characters.
3451 * @param __first Iterator referencing the first character to append.
3452 * @param __last Iterator marking the end of the range.
3453 * @return Reference to this string.
3454 *
3455 * Appends characters in the range [__first,__last) to this string.
3456 */
3457 template<class _InputIterator>
3458 basic_string&
3459 append(_InputIterator __first, _InputIterator __last)
3460 { return this->replace(_M_iend(), _M_iend(), __first, __last); }
3461
3462 /**
3463 * @brief Append a single character.
3464 * @param __c Character to append.
3465 */
3466 void
3467 push_back(_CharT __c)
3468 {
3469 const size_type __len = 1 + this->size();
3470 if (__len > this->capacity() || _M_rep()->_M_is_shared())
3471 this->reserve(__len);
3472 traits_type::assign(_M_data()[this->size()], __c);
3473 _M_rep()->_M_set_length_and_sharable(__len);
3474 }
3475
3476 /**
3477 * @brief Set value to contents of another string.
3478 * @param __str Source string to use.
3479 * @return Reference to this string.
3480 */
3481 basic_string&
3482 assign(const basic_string& __str);
3483
3484#if __cplusplus >= 201103L
3485 /**
3486 * @brief Set value to contents of another string.
3487 * @param __str Source string to use.
3488 * @return Reference to this string.
3489 *
3490 * This function sets this string to the exact contents of @a __str.
3491 * @a __str is a valid, but unspecified string.
3492 */
3493 // PR 58265, this should be noexcept.
3494 basic_string&
3495 assign(basic_string&& __str)
3496 {
3497 this->swap(__str);
3498 return *this;
3499 }
3500#endif // C++11
3501
3502 /**
3503 * @brief Set value to a substring of a string.
3504 * @param __str The string to use.
3505 * @param __pos Index of the first character of str.
3506 * @param __n Number of characters to use.
3507 * @return Reference to this string.
3508 * @throw std::out_of_range if @a pos is not a valid index.
3509 *
3510 * This function sets this string to the substring of @a __str
3511 * consisting of @a __n characters at @a __pos. If @a __n is
3512 * is larger than the number of available characters in @a
3513 * __str, the remainder of @a __str is used.
3514 */
3515 basic_string&
3516 assign(const basic_string& __str, size_type __pos, size_type __n)
3517 { return this->assign(__str._M_data()
3518 + __str._M_check(__pos, "basic_string::assign"),
3519 __str._M_limit(__pos, __n)); }
3520
3521 /**
3522 * @brief Set value to a C substring.
3523 * @param __s The C string to use.
3524 * @param __n Number of characters to use.
3525 * @return Reference to this string.
3526 *
3527 * This function sets the value of this string to the first @a __n
3528 * characters of @a __s. If @a __n is is larger than the number of
3529 * available characters in @a __s, the remainder of @a __s is used.
3530 */
3531 basic_string&
3532 assign(const _CharT* __s, size_type __n);
3533
3534 /**
3535 * @brief Set value to contents of a C string.
3536 * @param __s The C string to use.
3537 * @return Reference to this string.
3538 *
3539 * This function sets the value of this string to the value of @a __s.
3540 * The data is copied, so there is no dependence on @a __s once the
3541 * function returns.
3542 */
3543 basic_string&
3544 assign(const _CharT* __s)
3545 {
3546 __glibcxx_requires_string(__s);
3547 return this->assign(__s, traits_type::length(__s));
3548 }
3549
3550 /**
3551 * @brief Set value to multiple characters.
3552 * @param __n Length of the resulting string.
3553 * @param __c The character to use.
3554 * @return Reference to this string.
3555 *
3556 * This function sets the value of this string to @a __n copies of
3557 * character @a __c.
3558 */
3559 basic_string&
3560 assign(size_type __n, _CharT __c)
3561 { return _M_replace_aux(size_type(0), this->size(), __n, __c); }
3562
3563 /**
3564 * @brief Set value to a range of characters.
3565 * @param __first Iterator referencing the first character to append.
3566 * @param __last Iterator marking the end of the range.
3567 * @return Reference to this string.
3568 *
3569 * Sets value of string to characters in the range [__first,__last).
3570 */
3571 template<class _InputIterator>
3572 basic_string&
3573 assign(_InputIterator __first, _InputIterator __last)
3574 { return this->replace(_M_ibegin(), _M_iend(), __first, __last); }
3575
3576#if __cplusplus >= 201103L
3577 /**
3578 * @brief Set value to an initializer_list of characters.
3579 * @param __l The initializer_list of characters to assign.
3580 * @return Reference to this string.
3581 */
3582 basic_string&
3583 assign(initializer_list<_CharT> __l)
3584 { return this->assign(__l.begin(), __l.size()); }
3585#endif // C++11
3586
3587 /**
3588 * @brief Insert multiple characters.
3589 * @param __p Iterator referencing location in string to insert at.
3590 * @param __n Number of characters to insert
3591 * @param __c The character to insert.
3592 * @throw std::length_error If new length exceeds @c max_size().
3593 *
3594 * Inserts @a __n copies of character @a __c starting at the
3595 * position referenced by iterator @a __p. If adding
3596 * characters causes the length to exceed max_size(),
3597 * length_error is thrown. The value of the string doesn't
3598 * change if an error is thrown.
3599 */
3600 void
3601 insert(iterator __p, size_type __n, _CharT __c)
3602 { this->replace(__p, __p, __n, __c); }
3603
3604 /**
3605 * @brief Insert a range of characters.
3606 * @param __p Iterator referencing location in string to insert at.
3607 * @param __beg Start of range.
3608 * @param __end End of range.
3609 * @throw std::length_error If new length exceeds @c max_size().
3610 *
3611 * Inserts characters in range [__beg,__end). If adding
3612 * characters causes the length to exceed max_size(),
3613 * length_error is thrown. The value of the string doesn't
3614 * change if an error is thrown.
3615 */
3616 template<class _InputIterator>
3617 void
3618 insert(iterator __p, _InputIterator __beg, _InputIterator __end)
3619 { this->replace(__p, __p, __beg, __end); }
3620
3621#if __cplusplus >= 201103L
3622 /**
3623 * @brief Insert an initializer_list of characters.
3624 * @param __p Iterator referencing location in string to insert at.
3625 * @param __l The initializer_list of characters to insert.
3626 * @throw std::length_error If new length exceeds @c max_size().
3627 */
3628 void
3629 insert(iterator __p, initializer_list<_CharT> __l)
3630 {
3631 _GLIBCXX_DEBUG_PEDASSERT(__p >= _M_ibegin() && __p <= _M_iend());
3632 this->insert(__p - _M_ibegin(), __l.begin(), __l.size());
3633 }
3634#endif // C++11
3635
3636 /**
3637 * @brief Insert value of a string.
3638 * @param __pos1 Iterator referencing location in string to insert at.
3639 * @param __str The string to insert.
3640 * @return Reference to this string.
3641 * @throw std::length_error If new length exceeds @c max_size().
3642 *
3643 * Inserts value of @a __str starting at @a __pos1. If adding
3644 * characters causes the length to exceed max_size(),
3645 * length_error is thrown. The value of the string doesn't
3646 * change if an error is thrown.
3647 */
3648 basic_string&
3649 insert(size_type __pos1, const basic_string& __str)
3650 { return this->insert(__pos1, __str, size_type(0), __str.size()); }
3651
3652 /**
3653 * @brief Insert a substring.
3654 * @param __pos1 Iterator referencing location in string to insert at.
3655 * @param __str The string to insert.
3656 * @param __pos2 Start of characters in str to insert.
3657 * @param __n Number of characters to insert.
3658 * @return Reference to this string.
3659 * @throw std::length_error If new length exceeds @c max_size().
3660 * @throw std::out_of_range If @a pos1 > size() or
3661 * @a __pos2 > @a str.size().
3662 *
3663 * Starting at @a pos1, insert @a __n character of @a __str
3664 * beginning with @a __pos2. If adding characters causes the
3665 * length to exceed max_size(), length_error is thrown. If @a
3666 * __pos1 is beyond the end of this string or @a __pos2 is
3667 * beyond the end of @a __str, out_of_range is thrown. The
3668 * value of the string doesn't change if an error is thrown.
3669 */
3670 basic_string&
3671 insert(size_type __pos1, const basic_string& __str,
3672 size_type __pos2, size_type __n)
3673 { return this->insert(__pos1, __str._M_data()
3674 + __str._M_check(__pos2, "basic_string::insert"),
3675 __str._M_limit(__pos2, __n)); }
3676
3677 /**
3678 * @brief Insert a C substring.
3679 * @param __pos Iterator referencing location in string to insert at.
3680 * @param __s The C string to insert.
3681 * @param __n The number of characters to insert.
3682 * @return Reference to this string.
3683 * @throw std::length_error If new length exceeds @c max_size().
3684 * @throw std::out_of_range If @a __pos is beyond the end of this
3685 * string.
3686 *
3687 * Inserts the first @a __n characters of @a __s starting at @a
3688 * __pos. If adding characters causes the length to exceed
3689 * max_size(), length_error is thrown. If @a __pos is beyond
3690 * end(), out_of_range is thrown. The value of the string
3691 * doesn't change if an error is thrown.
3692 */
3693 basic_string&
3694 insert(size_type __pos, const _CharT* __s, size_type __n);
3695
3696 /**
3697 * @brief Insert a C string.
3698 * @param __pos Iterator referencing location in string to insert at.
3699 * @param __s The C string to insert.
3700 * @return Reference to this string.
3701 * @throw std::length_error If new length exceeds @c max_size().
3702 * @throw std::out_of_range If @a pos is beyond the end of this
3703 * string.
3704 *
3705 * Inserts the first @a n characters of @a __s starting at @a __pos. If
3706 * adding characters causes the length to exceed max_size(),
3707 * length_error is thrown. If @a __pos is beyond end(), out_of_range is
3708 * thrown. The value of the string doesn't change if an error is
3709 * thrown.
3710 */
3711 basic_string&
3712 insert(size_type __pos, const _CharT* __s)
3713 {
3714 __glibcxx_requires_string(__s);
3715 return this->insert(__pos, __s, traits_type::length(__s));
3716 }
3717
3718 /**
3719 * @brief Insert multiple characters.
3720 * @param __pos Index in string to insert at.
3721 * @param __n Number of characters to insert
3722 * @param __c The character to insert.
3723 * @return Reference to this string.
3724 * @throw std::length_error If new length exceeds @c max_size().
3725 * @throw std::out_of_range If @a __pos is beyond the end of this
3726 * string.
3727 *
3728 * Inserts @a __n copies of character @a __c starting at index
3729 * @a __pos. If adding characters causes the length to exceed
3730 * max_size(), length_error is thrown. If @a __pos > length(),
3731 * out_of_range is thrown. The value of the string doesn't
3732 * change if an error is thrown.
3733 */
3734 basic_string&
3735 insert(size_type __pos, size_type __n, _CharT __c)
3736 { return _M_replace_aux(_M_check(__pos, "basic_string::insert"),
3737 size_type(0), __n, __c); }
3738
3739 /**
3740 * @brief Insert one character.
3741 * @param __p Iterator referencing position in string to insert at.
3742 * @param __c The character to insert.
3743 * @return Iterator referencing newly inserted char.
3744 * @throw std::length_error If new length exceeds @c max_size().
3745 *
3746 * Inserts character @a __c at position referenced by @a __p.
3747 * If adding character causes the length to exceed max_size(),
3748 * length_error is thrown. If @a __p is beyond end of string,
3749 * out_of_range is thrown. The value of the string doesn't
3750 * change if an error is thrown.
3751 */
3752 iterator
3753 insert(iterator __p, _CharT __c)
3754 {
3755 _GLIBCXX_DEBUG_PEDASSERT(__p >= _M_ibegin() && __p <= _M_iend());
3756 const size_type __pos = __p - _M_ibegin();
3757 _M_replace_aux(__pos, size_type(0), size_type(1), __c);
3758 _M_rep()->_M_set_leaked();
3759 return iterator(_M_data() + __pos);
3760 }
3761
3762 /**
3763 * @brief Remove characters.
3764 * @param __pos Index of first character to remove (default 0).
3765 * @param __n Number of characters to remove (default remainder).
3766 * @return Reference to this string.
3767 * @throw std::out_of_range If @a pos is beyond the end of this
3768 * string.
3769 *
3770 * Removes @a __n characters from this string starting at @a
3771 * __pos. The length of the string is reduced by @a __n. If
3772 * there are < @a __n characters to remove, the remainder of
3773 * the string is truncated. If @a __p is beyond end of string,
3774 * out_of_range is thrown. The value of the string doesn't
3775 * change if an error is thrown.
3776 */
3777 basic_string&
3778 erase(size_type __pos = 0, size_type __n = npos)
3779 {
3780 _M_mutate(_M_check(__pos, "basic_string::erase"),
3781 _M_limit(__pos, __n), size_type(0));
3782 return *this;
3783 }
3784
3785 /**
3786 * @brief Remove one character.
3787 * @param __position Iterator referencing the character to remove.
3788 * @return iterator referencing same location after removal.
3789 *
3790 * Removes the character at @a __position from this string. The value
3791 * of the string doesn't change if an error is thrown.
3792 */
3793 iterator
3794 erase(iterator __position)
3795 {
3796 _GLIBCXX_DEBUG_PEDASSERT(__position >= _M_ibegin()
3797 && __position < _M_iend());
3798 const size_type __pos = __position - _M_ibegin();
3799 _M_mutate(__pos, size_type(1), size_type(0));
3800 _M_rep()->_M_set_leaked();
3801 return iterator(_M_data() + __pos);
3802 }
3803
3804 /**
3805 * @brief Remove a range of characters.
3806 * @param __first Iterator referencing the first character to remove.
3807 * @param __last Iterator referencing the end of the range.
3808 * @return Iterator referencing location of first after removal.
3809 *
3810 * Removes the characters in the range [first,last) from this string.
3811 * The value of the string doesn't change if an error is thrown.
3812 */
3813 iterator
3814 erase(iterator __first, iterator __last);
3815
3816#if __cplusplus >= 201103L
3817 /**
3818 * @brief Remove the last character.
3819 *
3820 * The string must be non-empty.
3821 */
3822 void
3823 pop_back() // FIXME C++11: should be noexcept.
3824 { erase(size()-1, 1); }
3825#endif // C++11
3826
3827 /**
3828 * @brief Replace characters with value from another string.
3829 * @param __pos Index of first character to replace.
3830 * @param __n Number of characters to be replaced.
3831 * @param __str String to insert.
3832 * @return Reference to this string.
3833 * @throw std::out_of_range If @a pos is beyond the end of this
3834 * string.
3835 * @throw std::length_error If new length exceeds @c max_size().
3836 *
3837 * Removes the characters in the range [__pos,__pos+__n) from
3838 * this string. In place, the value of @a __str is inserted.
3839 * If @a __pos is beyond end of string, out_of_range is thrown.
3840 * If the length of the result exceeds max_size(), length_error
3841 * is thrown. The value of the string doesn't change if an
3842 * error is thrown.
3843 */
3844 basic_string&
3845 replace(size_type __pos, size_type __n, const basic_string& __str)
3846 { return this->replace(__pos, __n, __str._M_data(), __str.size()); }
3847
3848 /**
3849 * @brief Replace characters with value from another string.
3850 * @param __pos1 Index of first character to replace.
3851 * @param __n1 Number of characters to be replaced.
3852 * @param __str String to insert.
3853 * @param __pos2 Index of first character of str to use.
3854 * @param __n2 Number of characters from str to use.
3855 * @return Reference to this string.
3856 * @throw std::out_of_range If @a __pos1 > size() or @a __pos2 >
3857 * __str.size().
3858 * @throw std::length_error If new length exceeds @c max_size().
3859 *
3860 * Removes the characters in the range [__pos1,__pos1 + n) from this
3861 * string. In place, the value of @a __str is inserted. If @a __pos is
3862 * beyond end of string, out_of_range is thrown. If the length of the
3863 * result exceeds max_size(), length_error is thrown. The value of the
3864 * string doesn't change if an error is thrown.
3865 */
3866 basic_string&
3867 replace(size_type __pos1, size_type __n1, const basic_string& __str,
3868 size_type __pos2, size_type __n2)
3869 { return this->replace(__pos1, __n1, __str._M_data()
3870 + __str._M_check(__pos2, "basic_string::replace"),
3871 __str._M_limit(__pos2, __n2)); }
3872
3873 /**
3874 * @brief Replace characters with value of a C substring.
3875 * @param __pos Index of first character to replace.
3876 * @param __n1 Number of characters to be replaced.
3877 * @param __s C string to insert.
3878 * @param __n2 Number of characters from @a s to use.
3879 * @return Reference to this string.
3880 * @throw std::out_of_range If @a pos1 > size().
3881 * @throw std::length_error If new length exceeds @c max_size().
3882 *
3883 * Removes the characters in the range [__pos,__pos + __n1)
3884 * from this string. In place, the first @a __n2 characters of
3885 * @a __s are inserted, or all of @a __s if @a __n2 is too large. If
3886 * @a __pos is beyond end of string, out_of_range is thrown. If
3887 * the length of result exceeds max_size(), length_error is
3888 * thrown. The value of the string doesn't change if an error
3889 * is thrown.
3890 */
3891 basic_string&
3892 replace(size_type __pos, size_type __n1, const _CharT* __s,
3893 size_type __n2);
3894
3895 /**
3896 * @brief Replace characters with value of a C string.
3897 * @param __pos Index of first character to replace.
3898 * @param __n1 Number of characters to be replaced.
3899 * @param __s C string to insert.
3900 * @return Reference to this string.
3901 * @throw std::out_of_range If @a pos > size().
3902 * @throw std::length_error If new length exceeds @c max_size().
3903 *
3904 * Removes the characters in the range [__pos,__pos + __n1)
3905 * from this string. In place, the characters of @a __s are
3906 * inserted. If @a __pos is beyond end of string, out_of_range
3907 * is thrown. If the length of result exceeds max_size(),
3908 * length_error is thrown. The value of the string doesn't
3909 * change if an error is thrown.
3910 */
3911 basic_string&
3912 replace(size_type __pos, size_type __n1, const _CharT* __s)
3913 {
3914 __glibcxx_requires_string(__s);
3915 return this->replace(__pos, __n1, __s, traits_type::length(__s));
3916 }
3917
3918 /**
3919 * @brief Replace characters with multiple characters.
3920 * @param __pos Index of first character to replace.
3921 * @param __n1 Number of characters to be replaced.
3922 * @param __n2 Number of characters to insert.
3923 * @param __c Character to insert.
3924 * @return Reference to this string.
3925 * @throw std::out_of_range If @a __pos > size().
3926 * @throw std::length_error If new length exceeds @c max_size().
3927 *
3928 * Removes the characters in the range [pos,pos + n1) from this
3929 * string. In place, @a __n2 copies of @a __c are inserted.
3930 * If @a __pos is beyond end of string, out_of_range is thrown.
3931 * If the length of result exceeds max_size(), length_error is
3932 * thrown. The value of the string doesn't change if an error
3933 * is thrown.
3934 */
3935 basic_string&
3936 replace(size_type __pos, size_type __n1, size_type __n2, _CharT __c)
3937 { return _M_replace_aux(_M_check(__pos, "basic_string::replace"),
3938 _M_limit(__pos, __n1), __n2, __c); }
3939
3940 /**
3941 * @brief Replace range of characters with string.
3942 * @param __i1 Iterator referencing start of range to replace.
3943 * @param __i2 Iterator referencing end of range to replace.
3944 * @param __str String value to insert.
3945 * @return Reference to this string.
3946 * @throw std::length_error If new length exceeds @c max_size().
3947 *
3948 * Removes the characters in the range [__i1,__i2). In place,
3949 * the value of @a __str is inserted. If the length of result
3950 * exceeds max_size(), length_error is thrown. The value of
3951 * the string doesn't change if an error is thrown.
3952 */
3953 basic_string&
3954 replace(iterator __i1, iterator __i2, const basic_string& __str)
3955 { return this->replace(__i1, __i2, __str._M_data(), __str.size()); }
3956
3957 /**
3958 * @brief Replace range of characters with C substring.
3959 * @param __i1 Iterator referencing start of range to replace.
3960 * @param __i2 Iterator referencing end of range to replace.
3961 * @param __s C string value to insert.
3962 * @param __n Number of characters from s to insert.
3963 * @return Reference to this string.
3964 * @throw std::length_error If new length exceeds @c max_size().
3965 *
3966 * Removes the characters in the range [__i1,__i2). In place,
3967 * the first @a __n characters of @a __s are inserted. If the
3968 * length of result exceeds max_size(), length_error is thrown.
3969 * The value of the string doesn't change if an error is
3970 * thrown.
3971 */
3972 basic_string&
3973 replace(iterator __i1, iterator __i2, const _CharT* __s, size_type __n)
3974 {
3975 _GLIBCXX_DEBUG_PEDASSERT(_M_ibegin() <= __i1 && __i1 <= __i2
3976 && __i2 <= _M_iend());
3977 return this->replace(__i1 - _M_ibegin(), __i2 - __i1, __s, __n);
3978 }
3979
3980 /**
3981 * @brief Replace range of characters with C string.
3982 * @param __i1 Iterator referencing start of range to replace.
3983 * @param __i2 Iterator referencing end of range to replace.
3984 * @param __s C string value to insert.
3985 * @return Reference to this string.
3986 * @throw std::length_error If new length exceeds @c max_size().
3987 *
3988 * Removes the characters in the range [__i1,__i2). In place,
3989 * the characters of @a __s are inserted. If the length of
3990 * result exceeds max_size(), length_error is thrown. The
3991 * value of the string doesn't change if an error is thrown.
3992 */
3993 basic_string&
3994 replace(iterator __i1, iterator __i2, const _CharT* __s)
3995 {
3996 __glibcxx_requires_string(__s);
3997 return this->replace(__i1, __i2, __s, traits_type::length(__s));
3998 }
3999
4000 /**
4001 * @brief Replace range of characters with multiple characters
4002 * @param __i1 Iterator referencing start of range to replace.
4003 * @param __i2 Iterator referencing end of range to replace.
4004 * @param __n Number of characters to insert.
4005 * @param __c Character to insert.
4006 * @return Reference to this string.
4007 * @throw std::length_error If new length exceeds @c max_size().
4008 *
4009 * Removes the characters in the range [__i1,__i2). In place,
4010 * @a __n copies of @a __c are inserted. If the length of
4011 * result exceeds max_size(), length_error is thrown. The
4012 * value of the string doesn't change if an error is thrown.
4013 */
4014 basic_string&
4015 replace(iterator __i1, iterator __i2, size_type __n, _CharT __c)
4016 {
4017 _GLIBCXX_DEBUG_PEDASSERT(_M_ibegin() <= __i1 && __i1 <= __i2
4018 && __i2 <= _M_iend());
4019 return _M_replace_aux(__i1 - _M_ibegin(), __i2 - __i1, __n, __c);
4020 }
4021
4022 /**
4023 * @brief Replace range of characters with range.
4024 * @param __i1 Iterator referencing start of range to replace.
4025 * @param __i2 Iterator referencing end of range to replace.
4026 * @param __k1 Iterator referencing start of range to insert.
4027 * @param __k2 Iterator referencing end of range to insert.
4028 * @return Reference to this string.
4029 * @throw std::length_error If new length exceeds @c max_size().
4030 *
4031 * Removes the characters in the range [__i1,__i2). In place,
4032 * characters in the range [__k1,__k2) are inserted. If the
4033 * length of result exceeds max_size(), length_error is thrown.
4034 * The value of the string doesn't change if an error is
4035 * thrown.
4036 */
4037 template<class _InputIterator>
4038 basic_string&
4039 replace(iterator __i1, iterator __i2,
4040 _InputIterator __k1, _InputIterator __k2)
4041 {
4042 _GLIBCXX_DEBUG_PEDASSERT(_M_ibegin() <= __i1 && __i1 <= __i2
4043 && __i2 <= _M_iend());
4044 __glibcxx_requires_valid_range(__k1, __k2);
4045 typedef typename std::__is_integer<_InputIterator>::__type _Integral;
4046 return _M_replace_dispatch(__i1, __i2, __k1, __k2, _Integral());
4047 }
4048
4049 // Specializations for the common case of pointer and iterator:
4050 // useful to avoid the overhead of temporary buffering in _M_replace.
4051 basic_string&
4052 replace(iterator __i1, iterator __i2, _CharT* __k1, _CharT* __k2)
4053 {
4054 _GLIBCXX_DEBUG_PEDASSERT(_M_ibegin() <= __i1 && __i1 <= __i2
4055 && __i2 <= _M_iend());
4056 __glibcxx_requires_valid_range(__k1, __k2);
4057 return this->replace(__i1 - _M_ibegin(), __i2 - __i1,
4058 __k1, __k2 - __k1);
4059 }
4060
4061 basic_string&
4062 replace(iterator __i1, iterator __i2,
4063 const _CharT* __k1, const _CharT* __k2)
4064 {
4065 _GLIBCXX_DEBUG_PEDASSERT(_M_ibegin() <= __i1 && __i1 <= __i2
4066 && __i2 <= _M_iend());
4067 __glibcxx_requires_valid_range(__k1, __k2);
4068 return this->replace(__i1 - _M_ibegin(), __i2 - __i1,
4069 __k1, __k2 - __k1);
4070 }
4071
4072 basic_string&
4073 replace(iterator __i1, iterator __i2, iterator __k1, iterator __k2)
4074 {
4075 _GLIBCXX_DEBUG_PEDASSERT(_M_ibegin() <= __i1 && __i1 <= __i2
4076 && __i2 <= _M_iend());
4077 __glibcxx_requires_valid_range(__k1, __k2);
4078 return this->replace(__i1 - _M_ibegin(), __i2 - __i1,
4079 __k1.base(), __k2 - __k1);
4080 }
4081
4082 basic_string&
4083 replace(iterator __i1, iterator __i2,
4084 const_iterator __k1, const_iterator __k2)
4085 {
4086 _GLIBCXX_DEBUG_PEDASSERT(_M_ibegin() <= __i1 && __i1 <= __i2
4087 && __i2 <= _M_iend());
4088 __glibcxx_requires_valid_range(__k1, __k2);
4089 return this->replace(__i1 - _M_ibegin(), __i2 - __i1,
4090 __k1.base(), __k2 - __k1);
4091 }
4092
4093#if __cplusplus >= 201103L
4094 /**
4095 * @brief Replace range of characters with initializer_list.
4096 * @param __i1 Iterator referencing start of range to replace.
4097 * @param __i2 Iterator referencing end of range to replace.
4098 * @param __l The initializer_list of characters to insert.
4099 * @return Reference to this string.
4100 * @throw std::length_error If new length exceeds @c max_size().
4101 *
4102 * Removes the characters in the range [__i1,__i2). In place,
4103 * characters in the range [__k1,__k2) are inserted. If the
4104 * length of result exceeds max_size(), length_error is thrown.
4105 * The value of the string doesn't change if an error is
4106 * thrown.
4107 */
4108 basic_string& replace(iterator __i1, iterator __i2,
4109 initializer_list<_CharT> __l)
4110 { return this->replace(__i1, __i2, __l.begin(), __l.end()); }
4111#endif // C++11
4112
4113 private:
4114 template<class _Integer>
4115 basic_string&
4116 _M_replace_dispatch(iterator __i1, iterator __i2, _Integer __n,
4117 _Integer __val, __true_type)
4118 { return _M_replace_aux(__i1 - _M_ibegin(), __i2 - __i1, __n, __val); }
4119
4120 template<class _InputIterator>
4121 basic_string&
4122 _M_replace_dispatch(iterator __i1, iterator __i2, _InputIterator __k1,
4123 _InputIterator __k2, __false_type);
4124
4125 basic_string&
4126 _M_replace_aux(size_type __pos1, size_type __n1, size_type __n2,
4127 _CharT __c);
4128
4129 basic_string&
4130 _M_replace_safe(size_type __pos1, size_type __n1, const _CharT* __s,
4131 size_type __n2);
4132
4133 // _S_construct_aux is used to implement the 21.3.1 para 15 which
4134 // requires special behaviour if _InIter is an integral type
4135 template<class _InIterator>
4136 static _CharT*
4137 _S_construct_aux(_InIterator __beg, _InIterator __end,
4138 const _Alloc& __a, __false_type)
4139 {
4140 typedef typename iterator_traits<_InIterator>::iterator_category _Tag;
4141 return _S_construct(__beg, __end, __a, _Tag());
4142 }
4143
4144 // _GLIBCXX_RESOLVE_LIB_DEFECTS
4145 // 438. Ambiguity in the "do the right thing" clause
4146 template<class _Integer>
4147 static _CharT*
4148 _S_construct_aux(_Integer __beg, _Integer __end,
4149 const _Alloc& __a, __true_type)
4150 { return _S_construct_aux_2(static_cast<size_type>(__beg),
4151 __end, __a); }
4152
4153 static _CharT*
4154 _S_construct_aux_2(size_type __req, _CharT __c, const _Alloc& __a)
4155 { return _S_construct(__req, __c, __a); }
4156
4157 template<class _InIterator>
4158 static _CharT*
4159 _S_construct(_InIterator __beg, _InIterator __end, const _Alloc& __a)
4160 {
4161 typedef typename std::__is_integer<_InIterator>::__type _Integral;
4162 return _S_construct_aux(__beg, __end, __a, _Integral());
4163 }
4164
4165 // For Input Iterators, used in istreambuf_iterators, etc.
4166 template<class _InIterator>
4167 static _CharT*
4168 _S_construct(_InIterator __beg, _InIterator __end, const _Alloc& __a,
4169 input_iterator_tag);
4170
4171 // For forward_iterators up to random_access_iterators, used for
4172 // string::iterator, _CharT*, etc.
4173 template<class _FwdIterator>
4174 static _CharT*
4175 _S_construct(_FwdIterator __beg, _FwdIterator __end, const _Alloc& __a,
4176 forward_iterator_tag);
4177
4178 static _CharT*
4179 _S_construct(size_type __req, _CharT __c, const _Alloc& __a);
4180
4181 public:
4182
4183 /**
4184 * @brief Copy substring into C string.
4185 * @param __s C string to copy value into.
4186 * @param __n Number of characters to copy.
4187 * @param __pos Index of first character to copy.
4188 * @return Number of characters actually copied
4189 * @throw std::out_of_range If __pos > size().
4190 *
4191 * Copies up to @a __n characters starting at @a __pos into the
4192 * C string @a __s. If @a __pos is %greater than size(),
4193 * out_of_range is thrown.
4194 */
4195 size_type
4196 copy(_CharT* __s, size_type __n, size_type __pos = 0) const;
4197
4198 /**
4199 * @brief Swap contents with another string.
4200 * @param __s String to swap with.
4201 *
4202 * Exchanges the contents of this string with that of @a __s in constant
4203 * time.
4204 */
4205 // PR 58265, this should be noexcept.
4206 void
4207 swap(basic_string& __s);
4208
4209 // String operations:
4210 /**
4211 * @brief Return const pointer to null-terminated contents.
4212 *
4213 * This is a handle to internal data. Do not modify or dire things may
4214 * happen.
4215 */
4216 const _CharT*
4217 c_str() const _GLIBCXX_NOEXCEPT
4218 { return _M_data(); }
4219
4220 /**
4221 * @brief Return const pointer to contents.
4222 *
4223 * This is a handle to internal data. Do not modify or dire things may
4224 * happen.
4225 */
4226 const _CharT*
4227 data() const _GLIBCXX_NOEXCEPT
4228 { return _M_data(); }
4229
4230 /**
4231 * @brief Return copy of allocator used to construct this string.
4232 */
4233 allocator_type
4234 get_allocator() const _GLIBCXX_NOEXCEPT
4235 { return _M_dataplus; }
4236
4237 /**
4238 * @brief Find position of a C substring.
4239 * @param __s C string to locate.
4240 * @param __pos Index of character to search from.
4241 * @param __n Number of characters from @a s to search for.
4242 * @return Index of start of first occurrence.
4243 *
4244 * Starting from @a __pos, searches forward for the first @a
4245 * __n characters in @a __s within this string. If found,
4246 * returns the index where it begins. If not found, returns
4247 * npos.
4248 */
4249 size_type
4250 find(const _CharT* __s, size_type __pos, size_type __n) const;
4251
4252 /**
4253 * @brief Find position of a string.
4254 * @param __str String to locate.
4255 * @param __pos Index of character to search from (default 0).
4256 * @return Index of start of first occurrence.
4257 *
4258 * Starting from @a __pos, searches forward for value of @a __str within
4259 * this string. If found, returns the index where it begins. If not
4260 * found, returns npos.
4261 */
4262 size_type
4263 find(const basic_string& __str, size_type __pos = 0) const
4264 _GLIBCXX_NOEXCEPT
4265 { return this->find(__str.data(), __pos, __str.size()); }
4266
4267 /**
4268 * @brief Find position of a C string.
4269 * @param __s C string to locate.
4270 * @param __pos Index of character to search from (default 0).
4271 * @return Index of start of first occurrence.
4272 *
4273 * Starting from @a __pos, searches forward for the value of @a
4274 * __s within this string. If found, returns the index where
4275 * it begins. If not found, returns npos.
4276 */
4277 size_type
4278 find(const _CharT* __s, size_type __pos = 0) const
4279 {
4280 __glibcxx_requires_string(__s);
4281 return this->find(__s, __pos, traits_type::length(__s));
4282 }
4283
4284 /**
4285 * @brief Find position of a character.
4286 * @param __c Character to locate.
4287 * @param __pos Index of character to search from (default 0).
4288 * @return Index of first occurrence.
4289 *
4290 * Starting from @a __pos, searches forward for @a __c within
4291 * this string. If found, returns the index where it was
4292 * found. If not found, returns npos.
4293 */
4294 size_type
4295 find(_CharT __c, size_type __pos = 0) const _GLIBCXX_NOEXCEPT;
4296
4297 /**
4298 * @brief Find last position of a string.
4299 * @param __str String to locate.
4300 * @param __pos Index of character to search back from (default end).
4301 * @return Index of start of last occurrence.
4302 *
4303 * Starting from @a __pos, searches backward for value of @a
4304 * __str within this string. If found, returns the index where
4305 * it begins. If not found, returns npos.
4306 */
4307 size_type
4308 rfind(const basic_string& __str, size_type __pos = npos) const
4309 _GLIBCXX_NOEXCEPT
4310 { return this->rfind(__str.data(), __pos, __str.size()); }
4311
4312 /**
4313 * @brief Find last position of a C substring.
4314 * @param __s C string to locate.
4315 * @param __pos Index of character to search back from.
4316 * @param __n Number of characters from s to search for.
4317 * @return Index of start of last occurrence.
4318 *
4319 * Starting from @a __pos, searches backward for the first @a
4320 * __n characters in @a __s within this string. If found,
4321 * returns the index where it begins. If not found, returns
4322 * npos.
4323 */
4324 size_type
4325 rfind(const _CharT* __s, size_type __pos, size_type __n) const;
4326
4327 /**
4328 * @brief Find last position of a C string.
4329 * @param __s C string to locate.
4330 * @param __pos Index of character to start search at (default end).
4331 * @return Index of start of last occurrence.
4332 *
4333 * Starting from @a __pos, searches backward for the value of
4334 * @a __s within this string. If found, returns the index
4335 * where it begins. If not found, returns npos.
4336 */
4337 size_type
4338 rfind(const _CharT* __s, size_type __pos = npos) const
4339 {
4340 __glibcxx_requires_string(__s);
4341 return this->rfind(__s, __pos, traits_type::length(__s));
4342 }
4343
4344 /**
4345 * @brief Find last position of a character.
4346 * @param __c Character to locate.
4347 * @param __pos Index of character to search back from (default end).
4348 * @return Index of last occurrence.
4349 *
4350 * Starting from @a __pos, searches backward for @a __c within
4351 * this string. If found, returns the index where it was
4352 * found. If not found, returns npos.
4353 */
4354 size_type
4355 rfind(_CharT __c, size_type __pos = npos) const _GLIBCXX_NOEXCEPT;
4356
4357 /**
4358 * @brief Find position of a character of string.
4359 * @param __str String containing characters to locate.
4360 * @param __pos Index of character to search from (default 0).
4361 * @return Index of first occurrence.
4362 *
4363 * Starting from @a __pos, searches forward for one of the
4364 * characters of @a __str within this string. If found,
4365 * returns the index where it was found. If not found, returns
4366 * npos.
4367 */
4368 size_type
4369 find_first_of(const basic_string& __str, size_type __pos = 0) const
4370 _GLIBCXX_NOEXCEPT
4371 { return this->find_first_of(__str.data(), __pos, __str.size()); }
4372
4373 /**
4374 * @brief Find position of a character of C substring.
4375 * @param __s String containing characters to locate.
4376 * @param __pos Index of character to search from.
4377 * @param __n Number of characters from s to search for.
4378 * @return Index of first occurrence.
4379 *
4380 * Starting from @a __pos, searches forward for one of the
4381 * first @a __n characters of @a __s within this string. If
4382 * found, returns the index where it was found. If not found,
4383 * returns npos.
4384 */
4385 size_type
4386 find_first_of(const _CharT* __s, size_type __pos, size_type __n) const;
4387
4388 /**
4389 * @brief Find position of a character of C string.
4390 * @param __s String containing characters to locate.
4391 * @param __pos Index of character to search from (default 0).
4392 * @return Index of first occurrence.
4393 *
4394 * Starting from @a __pos, searches forward for one of the
4395 * characters of @a __s within this string. If found, returns
4396 * the index where it was found. If not found, returns npos.
4397 */
4398 size_type
4399 find_first_of(const _CharT* __s, size_type __pos = 0) const
4400 {
4401 __glibcxx_requires_string(__s);
4402 return this->find_first_of(__s, __pos, traits_type::length(__s));
4403 }
4404
4405 /**
4406 * @brief Find position of a character.
4407 * @param __c Character to locate.
4408 * @param __pos Index of character to search from (default 0).
4409 * @return Index of first occurrence.
4410 *
4411 * Starting from @a __pos, searches forward for the character
4412 * @a __c within this string. If found, returns the index
4413 * where it was found. If not found, returns npos.
4414 *
4415 * Note: equivalent to find(__c, __pos).
4416 */
4417 size_type
4418 find_first_of(_CharT __c, size_type __pos = 0) const _GLIBCXX_NOEXCEPT
4419 { return this->find(__c, __pos); }
4420
4421 /**
4422 * @brief Find last position of a character of string.
4423 * @param __str String containing characters to locate.
4424 * @param __pos Index of character to search back from (default end).
4425 * @return Index of last occurrence.
4426 *
4427 * Starting from @a __pos, searches backward for one of the
4428 * characters of @a __str within this string. If found,
4429 * returns the index where it was found. If not found, returns
4430 * npos.
4431 */
4432 size_type
4433 find_last_of(const basic_string& __str, size_type __pos = npos) const
4434 _GLIBCXX_NOEXCEPT
4435 { return this->find_last_of(__str.data(), __pos, __str.size()); }
4436
4437 /**
4438 * @brief Find last position of a character of C substring.
4439 * @param __s C string containing characters to locate.
4440 * @param __pos Index of character to search back from.
4441 * @param __n Number of characters from s to search for.
4442 * @return Index of last occurrence.
4443 *
4444 * Starting from @a __pos, searches backward for one of the
4445 * first @a __n characters of @a __s within this string. If
4446 * found, returns the index where it was found. If not found,
4447 * returns npos.
4448 */
4449 size_type
4450 find_last_of(const _CharT* __s, size_type __pos, size_type __n) const;
4451
4452 /**
4453 * @brief Find last position of a character of C string.
4454 * @param __s C string containing characters to locate.
4455 * @param __pos Index of character to search back from (default end).
4456 * @return Index of last occurrence.
4457 *
4458 * Starting from @a __pos, searches backward for one of the
4459 * characters of @a __s within this string. If found, returns
4460 * the index where it was found. If not found, returns npos.
4461 */
4462 size_type
4463 find_last_of(const _CharT* __s, size_type __pos = npos) const
4464 {
4465 __glibcxx_requires_string(__s);
4466 return this->find_last_of(__s, __pos, traits_type::length(__s));
4467 }
4468
4469 /**
4470 * @brief Find last position of a character.
4471 * @param __c Character to locate.
4472 * @param __pos Index of character to search back from (default end).
4473 * @return Index of last occurrence.
4474 *
4475 * Starting from @a __pos, searches backward for @a __c within
4476 * this string. If found, returns the index where it was
4477 * found. If not found, returns npos.
4478 *
4479 * Note: equivalent to rfind(__c, __pos).
4480 */
4481 size_type
4482 find_last_of(_CharT __c, size_type __pos = npos) const _GLIBCXX_NOEXCEPT
4483 { return this->rfind(__c, __pos); }
4484
4485 /**
4486 * @brief Find position of a character not in string.
4487 * @param __str String containing characters to avoid.
4488 * @param __pos Index of character to search from (default 0).
4489 * @return Index of first occurrence.
4490 *
4491 * Starting from @a __pos, searches forward for a character not contained
4492 * in @a __str within this string. If found, returns the index where it
4493 * was found. If not found, returns npos.
4494 */
4495 size_type
4496 find_first_not_of(const basic_string& __str, size_type __pos = 0) const
4497 _GLIBCXX_NOEXCEPT
4498 { return this->find_first_not_of(__str.data(), __pos, __str.size()); }
4499
4500 /**
4501 * @brief Find position of a character not in C substring.
4502 * @param __s C string containing characters to avoid.
4503 * @param __pos Index of character to search from.
4504 * @param __n Number of characters from __s to consider.
4505 * @return Index of first occurrence.
4506 *
4507 * Starting from @a __pos, searches forward for a character not
4508 * contained in the first @a __n characters of @a __s within
4509 * this string. If found, returns the index where it was
4510 * found. If not found, returns npos.
4511 */
4512 size_type
4513 find_first_not_of(const _CharT* __s, size_type __pos,
4514 size_type __n) const;
4515
4516 /**
4517 * @brief Find position of a character not in C string.
4518 * @param __s C string containing characters to avoid.
4519 * @param __pos Index of character to search from (default 0).
4520 * @return Index of first occurrence.
4521 *
4522 * Starting from @a __pos, searches forward for a character not
4523 * contained in @a __s within this string. If found, returns
4524 * the index where it was found. If not found, returns npos.
4525 */
4526 size_type
4527 find_first_not_of(const _CharT* __s, size_type __pos = 0) const
4528 {
4529 __glibcxx_requires_string(__s);
4530 return this->find_first_not_of(__s, __pos, traits_type::length(__s));
4531 }
4532
4533 /**
4534 * @brief Find position of a different character.
4535 * @param __c Character to avoid.
4536 * @param __pos Index of character to search from (default 0).
4537 * @return Index of first occurrence.
4538 *
4539 * Starting from @a __pos, searches forward for a character
4540 * other than @a __c within this string. If found, returns the
4541 * index where it was found. If not found, returns npos.
4542 */
4543 size_type
4544 find_first_not_of(_CharT __c, size_type __pos = 0) const
4545 _GLIBCXX_NOEXCEPT;
4546
4547 /**
4548 * @brief Find last position of a character not in string.
4549 * @param __str String containing characters to avoid.
4550 * @param __pos Index of character to search back from (default end).
4551 * @return Index of last occurrence.
4552 *
4553 * Starting from @a __pos, searches backward for a character
4554 * not contained in @a __str within this string. If found,
4555 * returns the index where it was found. If not found, returns
4556 * npos.
4557 */
4558 size_type
4559 find_last_not_of(const basic_string& __str, size_type __pos = npos) const
4560 _GLIBCXX_NOEXCEPT
4561 { return this->find_last_not_of(__str.data(), __pos, __str.size()); }
4562
4563 /**
4564 * @brief Find last position of a character not in C substring.
4565 * @param __s C string containing characters to avoid.
4566 * @param __pos Index of character to search back from.
4567 * @param __n Number of characters from s to consider.
4568 * @return Index of last occurrence.
4569 *
4570 * Starting from @a __pos, searches backward for a character not
4571 * contained in the first @a __n characters of @a __s within this string.
4572 * If found, returns the index where it was found. If not found,
4573 * returns npos.
4574 */
4575 size_type
4576 find_last_not_of(const _CharT* __s, size_type __pos,
4577 size_type __n) const;
4578 /**
4579 * @brief Find last position of a character not in C string.
4580 * @param __s C string containing characters to avoid.
4581 * @param __pos Index of character to search back from (default end).
4582 * @return Index of last occurrence.
4583 *
4584 * Starting from @a __pos, searches backward for a character
4585 * not contained in @a __s within this string. If found,
4586 * returns the index where it was found. If not found, returns
4587 * npos.
4588 */
4589 size_type
4590 find_last_not_of(const _CharT* __s, size_type __pos = npos) const
4591 {
4592 __glibcxx_requires_string(__s);
4593 return this->find_last_not_of(__s, __pos, traits_type::length(__s));
4594 }
4595
4596 /**
4597 * @brief Find last position of a different character.
4598 * @param __c Character to avoid.
4599 * @param __pos Index of character to search back from (default end).
4600 * @return Index of last occurrence.
4601 *
4602 * Starting from @a __pos, searches backward for a character other than
4603 * @a __c within this string. If found, returns the index where it was
4604 * found. If not found, returns npos.
4605 */
4606 size_type
4607 find_last_not_of(_CharT __c, size_type __pos = npos) const
4608 _GLIBCXX_NOEXCEPT;
4609
4610 /**
4611 * @brief Get a substring.
4612 * @param __pos Index of first character (default 0).
4613 * @param __n Number of characters in substring (default remainder).
4614 * @return The new string.
4615 * @throw std::out_of_range If __pos > size().
4616 *
4617 * Construct and return a new string using the @a __n
4618 * characters starting at @a __pos. If the string is too
4619 * short, use the remainder of the characters. If @a __pos is
4620 * beyond the end of the string, out_of_range is thrown.
4621 */
4622 basic_string
4623 substr(size_type __pos = 0, size_type __n = npos) const
4624 { return basic_string(*this,
4625 _M_check(__pos, "basic_string::substr"), __n); }
4626
4627 /**
4628 * @brief Compare to a string.
4629 * @param __str String to compare against.
4630 * @return Integer < 0, 0, or > 0.
4631 *
4632 * Returns an integer < 0 if this string is ordered before @a
4633 * __str, 0 if their values are equivalent, or > 0 if this
4634 * string is ordered after @a __str. Determines the effective
4635 * length rlen of the strings to compare as the smallest of
4636 * size() and str.size(). The function then compares the two
4637 * strings by calling traits::compare(data(), str.data(),rlen).
4638 * If the result of the comparison is nonzero returns it,
4639 * otherwise the shorter one is ordered first.
4640 */
4641 int
4642 compare(const basic_string& __str) const
4643 {
4644 const size_type __size = this->size();
4645 const size_type __osize = __str.size();
4646 const size_type __len = std::min(__size, __osize);
4647
4648 int __r = traits_type::compare(_M_data(), __str.data(), __len);
4649 if (!__r)
4650 __r = _S_compare(__size, __osize);
4651 return __r;
4652 }
4653
4654 /**
4655 * @brief Compare substring to a string.
4656 * @param __pos Index of first character of substring.
4657 * @param __n Number of characters in substring.
4658 * @param __str String to compare against.
4659 * @return Integer < 0, 0, or > 0.
4660 *
4661 * Form the substring of this string from the @a __n characters
4662 * starting at @a __pos. Returns an integer < 0 if the
4663 * substring is ordered before @a __str, 0 if their values are
4664 * equivalent, or > 0 if the substring is ordered after @a
4665 * __str. Determines the effective length rlen of the strings
4666 * to compare as the smallest of the length of the substring
4667 * and @a __str.size(). The function then compares the two
4668 * strings by calling
4669 * traits::compare(substring.data(),str.data(),rlen). If the
4670 * result of the comparison is nonzero returns it, otherwise
4671 * the shorter one is ordered first.
4672 */
4673 int
4674 compare(size_type __pos, size_type __n, const basic_string& __str) const;
4675
4676 /**
4677 * @brief Compare substring to a substring.
4678 * @param __pos1 Index of first character of substring.
4679 * @param __n1 Number of characters in substring.
4680 * @param __str String to compare against.
4681 * @param __pos2 Index of first character of substring of str.
4682 * @param __n2 Number of characters in substring of str.
4683 * @return Integer < 0, 0, or > 0.
4684 *
4685 * Form the substring of this string from the @a __n1
4686 * characters starting at @a __pos1. Form the substring of @a
4687 * __str from the @a __n2 characters starting at @a __pos2.
4688 * Returns an integer < 0 if this substring is ordered before
4689 * the substring of @a __str, 0 if their values are equivalent,
4690 * or > 0 if this substring is ordered after the substring of
4691 * @a __str. Determines the effective length rlen of the
4692 * strings to compare as the smallest of the lengths of the
4693 * substrings. The function then compares the two strings by
4694 * calling
4695 * traits::compare(substring.data(),str.substr(pos2,n2).data(),rlen).
4696 * If the result of the comparison is nonzero returns it,
4697 * otherwise the shorter one is ordered first.
4698 */
4699 int
4700 compare(size_type __pos1, size_type __n1, const basic_string& __str,
4701 size_type __pos2, size_type __n2) const;
4702
4703 /**
4704 * @brief Compare to a C string.
4705 * @param __s C string to compare against.
4706 * @return Integer < 0, 0, or > 0.
4707 *
4708 * Returns an integer < 0 if this string is ordered before @a __s, 0 if
4709 * their values are equivalent, or > 0 if this string is ordered after
4710 * @a __s. Determines the effective length rlen of the strings to
4711 * compare as the smallest of size() and the length of a string
4712 * constructed from @a __s. The function then compares the two strings
4713 * by calling traits::compare(data(),s,rlen). If the result of the
4714 * comparison is nonzero returns it, otherwise the shorter one is
4715 * ordered first.
4716 */
4717 int
4718 compare(const _CharT* __s) const;
4719
4720 // _GLIBCXX_RESOLVE_LIB_DEFECTS
4721 // 5 String::compare specification questionable
4722 /**
4723 * @brief Compare substring to a C string.
4724 * @param __pos Index of first character of substring.
4725 * @param __n1 Number of characters in substring.
4726 * @param __s C string to compare against.
4727 * @return Integer < 0, 0, or > 0.
4728 *
4729 * Form the substring of this string from the @a __n1
4730 * characters starting at @a pos. Returns an integer < 0 if
4731 * the substring is ordered before @a __s, 0 if their values
4732 * are equivalent, or > 0 if the substring is ordered after @a
4733 * __s. Determines the effective length rlen of the strings to
4734 * compare as the smallest of the length of the substring and
4735 * the length of a string constructed from @a __s. The
4736 * function then compares the two string by calling
4737 * traits::compare(substring.data(),__s,rlen). If the result of
4738 * the comparison is nonzero returns it, otherwise the shorter
4739 * one is ordered first.
4740 */
4741 int
4742 compare(size_type __pos, size_type __n1, const _CharT* __s) const;
4743
4744 /**
4745 * @brief Compare substring against a character %array.
4746 * @param __pos Index of first character of substring.
4747 * @param __n1 Number of characters in substring.
4748 * @param __s character %array to compare against.
4749 * @param __n2 Number of characters of s.
4750 * @return Integer < 0, 0, or > 0.
4751 *
4752 * Form the substring of this string from the @a __n1
4753 * characters starting at @a __pos. Form a string from the
4754 * first @a __n2 characters of @a __s. Returns an integer < 0
4755 * if this substring is ordered before the string from @a __s,
4756 * 0 if their values are equivalent, or > 0 if this substring
4757 * is ordered after the string from @a __s. Determines the
4758 * effective length rlen of the strings to compare as the
4759 * smallest of the length of the substring and @a __n2. The
4760 * function then compares the two strings by calling
4761 * traits::compare(substring.data(),s,rlen). If the result of
4762 * the comparison is nonzero returns it, otherwise the shorter
4763 * one is ordered first.
4764 *
4765 * NB: s must have at least n2 characters, &apos;\\0&apos; has
4766 * no special meaning.
4767 */
4768 int
4769 compare(size_type __pos, size_type __n1, const _CharT* __s,
4770 size_type __n2) const;
4771 };
4772#endif // !_GLIBCXX_USE_CXX11_ABI
4773
4774 // operator+
4775 /**
4776 * @brief Concatenate two strings.
4777 * @param __lhs First string.
4778 * @param __rhs Last string.
4779 * @return New string with value of @a __lhs followed by @a __rhs.
4780 */
4781 template<typename _CharT, typename _Traits, typename _Alloc>
4782 basic_string<_CharT, _Traits, _Alloc>
4783 operator+(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
4784 const basic_string<_CharT, _Traits, _Alloc>& __rhs)
4785 {
4786 basic_string<_CharT, _Traits, _Alloc> __str(__lhs);
4787 __str.append(__rhs);
4788 return __str;
4789 }
4790
4791 /**
4792 * @brief Concatenate C string and string.
4793 * @param __lhs First string.
4794 * @param __rhs Last string.
4795 * @return New string with value of @a __lhs followed by @a __rhs.
4796 */
4797 template<typename _CharT, typename _Traits, typename _Alloc>
4798 basic_string<_CharT,_Traits,_Alloc>
4799 operator+(const _CharT* __lhs,
4800 const basic_string<_CharT,_Traits,_Alloc>& __rhs);
4801
4802 /**
4803 * @brief Concatenate character and string.
4804 * @param __lhs First string.
4805 * @param __rhs Last string.
4806 * @return New string with @a __lhs followed by @a __rhs.
4807 */
4808 template<typename _CharT, typename _Traits, typename _Alloc>
4809 basic_string<_CharT,_Traits,_Alloc>
4810 operator+(_CharT __lhs, const basic_string<_CharT,_Traits,_Alloc>& __rhs);
4811
4812 /**
4813 * @brief Concatenate string and C string.
4814 * @param __lhs First string.
4815 * @param __rhs Last string.
4816 * @return New string with @a __lhs followed by @a __rhs.
4817 */
4818 template<typename _CharT, typename _Traits, typename _Alloc>
4819 inline basic_string<_CharT, _Traits, _Alloc>
4820 operator+(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
4821 const _CharT* __rhs)
4822 {
4823 basic_string<_CharT, _Traits, _Alloc> __str(__lhs);
4824 __str.append(__rhs);
4825 return __str;
4826 }
4827
4828 /**
4829 * @brief Concatenate string and character.
4830 * @param __lhs First string.
4831 * @param __rhs Last string.
4832 * @return New string with @a __lhs followed by @a __rhs.
4833 */
4834 template<typename _CharT, typename _Traits, typename _Alloc>
4835 inline basic_string<_CharT, _Traits, _Alloc>
4836 operator+(const basic_string<_CharT, _Traits, _Alloc>& __lhs, _CharT __rhs)
4837 {
4838 typedef basic_string<_CharT, _Traits, _Alloc> __string_type;
4839 typedef typename __string_type::size_type __size_type;
4840 __string_type __str(__lhs);
4841 __str.append(__size_type(1), __rhs);
4842 return __str;
4843 }
4844
4845#if __cplusplus >= 201103L
4846 template<typename _CharT, typename _Traits, typename _Alloc>
4847 inline basic_string<_CharT, _Traits, _Alloc>
4848 operator+(basic_string<_CharT, _Traits, _Alloc>&& __lhs,
4849 const basic_string<_CharT, _Traits, _Alloc>& __rhs)
4850 { return std::move(__lhs.append(__rhs)); }
4851
4852 template<typename _CharT, typename _Traits, typename _Alloc>
4853 inline basic_string<_CharT, _Traits, _Alloc>
4854 operator+(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
4855 basic_string<_CharT, _Traits, _Alloc>&& __rhs)
4856 { return std::move(__rhs.insert(0, __lhs)); }
4857
4858 template<typename _CharT, typename _Traits, typename _Alloc>
4859 inline basic_string<_CharT, _Traits, _Alloc>
4860 operator+(basic_string<_CharT, _Traits, _Alloc>&& __lhs,
4861 basic_string<_CharT, _Traits, _Alloc>&& __rhs)
4862 {
4863 const auto __size = __lhs.size() + __rhs.size();
4864 const bool __cond = (__size > __lhs.capacity()
4865 && __size <= __rhs.capacity());
4866 return __cond ? std::move(__rhs.insert(0, __lhs))
4867 : std::move(__lhs.append(__rhs));
4868 }
4869
4870 template<typename _CharT, typename _Traits, typename _Alloc>
4871 inline basic_string<_CharT, _Traits, _Alloc>
4872 operator+(const _CharT* __lhs,
4873 basic_string<_CharT, _Traits, _Alloc>&& __rhs)
4874 { return std::move(__rhs.insert(0, __lhs)); }
4875
4876 template<typename _CharT, typename _Traits, typename _Alloc>
4877 inline basic_string<_CharT, _Traits, _Alloc>
4878 operator+(_CharT __lhs,
4879 basic_string<_CharT, _Traits, _Alloc>&& __rhs)
4880 { return std::move(__rhs.insert(0, 1, __lhs)); }
4881
4882 template<typename _CharT, typename _Traits, typename _Alloc>
4883 inline basic_string<_CharT, _Traits, _Alloc>
4884 operator+(basic_string<_CharT, _Traits, _Alloc>&& __lhs,
4885 const _CharT* __rhs)
4886 { return std::move(__lhs.append(__rhs)); }
4887
4888 template<typename _CharT, typename _Traits, typename _Alloc>
4889 inline basic_string<_CharT, _Traits, _Alloc>
4890 operator+(basic_string<_CharT, _Traits, _Alloc>&& __lhs,
4891 _CharT __rhs)
4892 { return std::move(__lhs.append(1, __rhs)); }
4893#endif
4894
4895 // operator ==
4896 /**
4897 * @brief Test equivalence of two strings.
4898 * @param __lhs First string.
4899 * @param __rhs Second string.
4900 * @return True if @a __lhs.compare(@a __rhs) == 0. False otherwise.
4901 */
4902 template<typename _CharT, typename _Traits, typename _Alloc>
4903 inline bool
4904 operator==(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
4905 const basic_string<_CharT, _Traits, _Alloc>& __rhs)
4906 { return __lhs.compare(__rhs) == 0; }
4907
4908 template<typename _CharT>
4909 inline
4910 typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value, bool>::__type
4911 operator==(const basic_string<_CharT>& __lhs,
4912 const basic_string<_CharT>& __rhs)
4913 { return (__lhs.size() == __rhs.size()
4914 && !std::char_traits<_CharT>::compare(__lhs.data(), __rhs.data(),
4915 __lhs.size())); }
4916
4917 /**
4918 * @brief Test equivalence of C string and string.
4919 * @param __lhs C string.
4920 * @param __rhs String.
4921 * @return True if @a __rhs.compare(@a __lhs) == 0. False otherwise.
4922 */
4923 template<typename _CharT, typename _Traits, typename _Alloc>
4924 inline bool
4925 operator==(const _CharT* __lhs,
4926 const basic_string<_CharT, _Traits, _Alloc>& __rhs)
4927 { return __rhs.compare(__lhs) == 0; }
4928
4929 /**
4930 * @brief Test equivalence of string and C string.
4931 * @param __lhs String.
4932 * @param __rhs C string.
4933 * @return True if @a __lhs.compare(@a __rhs) == 0. False otherwise.
4934 */
4935 template<typename _CharT, typename _Traits, typename _Alloc>
4936 inline bool
4937 operator==(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
4938 const _CharT* __rhs)
4939 { return __lhs.compare(__rhs) == 0; }
4940
4941 // operator !=
4942 /**
4943 * @brief Test difference of two strings.
4944 * @param __lhs First string.
4945 * @param __rhs Second string.
4946 * @return True if @a __lhs.compare(@a __rhs) != 0. False otherwise.
4947 */
4948 template<typename _CharT, typename _Traits, typename _Alloc>
4949 inline bool
4950 operator!=(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
4951 const basic_string<_CharT, _Traits, _Alloc>& __rhs)
4952 { return !(__lhs == __rhs); }
4953
4954 /**
4955 * @brief Test difference of C string and string.
4956 * @param __lhs C string.
4957 * @param __rhs String.
4958 * @return True if @a __rhs.compare(@a __lhs) != 0. False otherwise.
4959 */
4960 template<typename _CharT, typename _Traits, typename _Alloc>
4961 inline bool
4962 operator!=(const _CharT* __lhs,
4963 const basic_string<_CharT, _Traits, _Alloc>& __rhs)
4964 { return !(__lhs == __rhs); }
4965
4966 /**
4967 * @brief Test difference of string and C string.
4968 * @param __lhs String.
4969 * @param __rhs C string.
4970 * @return True if @a __lhs.compare(@a __rhs) != 0. False otherwise.
4971 */
4972 template<typename _CharT, typename _Traits, typename _Alloc>
4973 inline bool
4974 operator!=(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
4975 const _CharT* __rhs)
4976 { return !(__lhs == __rhs); }
4977
4978 // operator <
4979 /**
4980 * @brief Test if string precedes string.
4981 * @param __lhs First string.
4982 * @param __rhs Second string.
4983 * @return True if @a __lhs precedes @a __rhs. False otherwise.
4984 */
4985 template<typename _CharT, typename _Traits, typename _Alloc>
4986 inline bool
4987 operator<(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
4988 const basic_string<_CharT, _Traits, _Alloc>& __rhs)
4989 { return __lhs.compare(__rhs) < 0; }
4990
4991 /**
4992 * @brief Test if string precedes C string.
4993 * @param __lhs String.
4994 * @param __rhs C string.
4995 * @return True if @a __lhs precedes @a __rhs. False otherwise.
4996 */
4997 template<typename _CharT, typename _Traits, typename _Alloc>
4998 inline bool
4999 operator<(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
5000 const _CharT* __rhs)
5001 { return __lhs.compare(__rhs) < 0; }
5002
5003 /**
5004 * @brief Test if C string precedes string.
5005 * @param __lhs C string.
5006 * @param __rhs String.
5007 * @return True if @a __lhs precedes @a __rhs. False otherwise.
5008 */
5009 template<typename _CharT, typename _Traits, typename _Alloc>
5010 inline bool
5011 operator<(const _CharT* __lhs,
5012 const basic_string<_CharT, _Traits, _Alloc>& __rhs)
5013 { return __rhs.compare(__lhs) > 0; }
5014
5015 // operator >
5016 /**
5017 * @brief Test if string follows string.
5018 * @param __lhs First string.
5019 * @param __rhs Second string.
5020 * @return True if @a __lhs follows @a __rhs. False otherwise.
5021 */
5022 template<typename _CharT, typename _Traits, typename _Alloc>
5023 inline bool
5024 operator>(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
5025 const basic_string<_CharT, _Traits, _Alloc>& __rhs)
5026 { return __lhs.compare(__rhs) > 0; }
5027
5028 /**
5029 * @brief Test if string follows C string.
5030 * @param __lhs String.
5031 * @param __rhs C string.
5032 * @return True if @a __lhs follows @a __rhs. False otherwise.
5033 */
5034 template<typename _CharT, typename _Traits, typename _Alloc>
5035 inline bool
5036 operator>(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
5037 const _CharT* __rhs)
5038 { return __lhs.compare(__rhs) > 0; }
5039
5040 /**
5041 * @brief Test if C string follows string.
5042 * @param __lhs C string.
5043 * @param __rhs String.
5044 * @return True if @a __lhs follows @a __rhs. False otherwise.
5045 */
5046 template<typename _CharT, typename _Traits, typename _Alloc>
5047 inline bool
5048 operator>(const _CharT* __lhs,
5049 const basic_string<_CharT, _Traits, _Alloc>& __rhs)
5050 { return __rhs.compare(__lhs) < 0; }
5051
5052 // operator <=
5053 /**
5054 * @brief Test if string doesn't follow string.
5055 * @param __lhs First string.
5056 * @param __rhs Second string.
5057 * @return True if @a __lhs doesn't follow @a __rhs. False otherwise.
5058 */
5059 template<typename _CharT, typename _Traits, typename _Alloc>
5060 inline bool
5061 operator<=(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
5062 const basic_string<_CharT, _Traits, _Alloc>& __rhs)
5063 { return __lhs.compare(__rhs) <= 0; }
5064
5065 /**
5066 * @brief Test if string doesn't follow C string.
5067 * @param __lhs String.
5068 * @param __rhs C string.
5069 * @return True if @a __lhs doesn't follow @a __rhs. False otherwise.
5070 */
5071 template<typename _CharT, typename _Traits, typename _Alloc>
5072 inline bool
5073 operator<=(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
5074 const _CharT* __rhs)
5075 { return __lhs.compare(__rhs) <= 0; }
5076
5077 /**
5078 * @brief Test if C string doesn't follow string.
5079 * @param __lhs C string.
5080 * @param __rhs String.
5081 * @return True if @a __lhs doesn't follow @a __rhs. False otherwise.
5082 */
5083 template<typename _CharT, typename _Traits, typename _Alloc>
5084 inline bool
5085 operator<=(const _CharT* __lhs,
5086 const basic_string<_CharT, _Traits, _Alloc>& __rhs)
5087 { return __rhs.compare(__lhs) >= 0; }
5088
5089 // operator >=
5090 /**
5091 * @brief Test if string doesn't precede string.
5092 * @param __lhs First string.
5093 * @param __rhs Second string.
5094 * @return True if @a __lhs doesn't precede @a __rhs. False otherwise.
5095 */
5096 template<typename _CharT, typename _Traits, typename _Alloc>
5097 inline bool
5098 operator>=(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
5099 const basic_string<_CharT, _Traits, _Alloc>& __rhs)
5100 { return __lhs.compare(__rhs) >= 0; }
5101
5102 /**
5103 * @brief Test if string doesn't precede C string.
5104 * @param __lhs String.
5105 * @param __rhs C string.
5106 * @return True if @a __lhs doesn't precede @a __rhs. False otherwise.
5107 */
5108 template<typename _CharT, typename _Traits, typename _Alloc>
5109 inline bool
5110 operator>=(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
5111 const _CharT* __rhs)
5112 { return __lhs.compare(__rhs) >= 0; }
5113
5114 /**
5115 * @brief Test if C string doesn't precede string.
5116 * @param __lhs C string.
5117 * @param __rhs String.
5118 * @return True if @a __lhs doesn't precede @a __rhs. False otherwise.
5119 */
5120 template<typename _CharT, typename _Traits, typename _Alloc>
5121 inline bool
5122 operator>=(const _CharT* __lhs,
5123 const basic_string<_CharT, _Traits, _Alloc>& __rhs)
5124 { return __rhs.compare(__lhs) <= 0; }
5125
5126 /**
5127 * @brief Swap contents of two strings.
5128 * @param __lhs First string.
5129 * @param __rhs Second string.
5130 *
5131 * Exchanges the contents of @a __lhs and @a __rhs in constant time.
5132 */
5133 template<typename _CharT, typename _Traits, typename _Alloc>
5134 inline void
5135 swap(basic_string<_CharT, _Traits, _Alloc>& __lhs,
5136 basic_string<_CharT, _Traits, _Alloc>& __rhs)
5137 { __lhs.swap(__rhs); }
5138
5139
5140 /**
5141 * @brief Read stream into a string.
5142 * @param __is Input stream.
5143 * @param __str Buffer to store into.
5144 * @return Reference to the input stream.
5145 *
5146 * Stores characters from @a __is into @a __str until whitespace is
5147 * found, the end of the stream is encountered, or str.max_size()
5148 * is reached. If is.width() is non-zero, that is the limit on the
5149 * number of characters stored into @a __str. Any previous
5150 * contents of @a __str are erased.
5151 */
5152 template<typename _CharT, typename _Traits, typename _Alloc>
5153 basic_istream<_CharT, _Traits>&
5154 operator>>(basic_istream<_CharT, _Traits>& __is,
5155 basic_string<_CharT, _Traits, _Alloc>& __str);
5156
5157 template<>
5158 basic_istream<char>&
5159 operator>>(basic_istream<char>& __is, basic_string<char>& __str);
5160
5161 /**
5162 * @brief Write string to a stream.
5163 * @param __os Output stream.
5164 * @param __str String to write out.
5165 * @return Reference to the output stream.
5166 *
5167 * Output characters of @a __str into os following the same rules as for
5168 * writing a C string.
5169 */
5170 template<typename _CharT, typename _Traits, typename _Alloc>
5171 inline basic_ostream<_CharT, _Traits>&
5172 operator<<(basic_ostream<_CharT, _Traits>& __os,
5173 const basic_string<_CharT, _Traits, _Alloc>& __str)
5174 {
5175 // _GLIBCXX_RESOLVE_LIB_DEFECTS
5176 // 586. string inserter not a formatted function
5177 return __ostream_insert(__os, __str.data(), __str.size());
5178 }
5179
5180 /**
5181 * @brief Read a line from stream into a string.
5182 * @param __is Input stream.
5183 * @param __str Buffer to store into.
5184 * @param __delim Character marking end of line.
5185 * @return Reference to the input stream.
5186 *
5187 * Stores characters from @a __is into @a __str until @a __delim is
5188 * found, the end of the stream is encountered, or str.max_size()
5189 * is reached. Any previous contents of @a __str are erased. If
5190 * @a __delim is encountered, it is extracted but not stored into
5191 * @a __str.
5192 */
5193 template<typename _CharT, typename _Traits, typename _Alloc>
5194 basic_istream<_CharT, _Traits>&
5195 getline(basic_istream<_CharT, _Traits>& __is,
5196 basic_string<_CharT, _Traits, _Alloc>& __str, _CharT __delim);
5197
5198 /**
5199 * @brief Read a line from stream into a string.
5200 * @param __is Input stream.
5201 * @param __str Buffer to store into.
5202 * @return Reference to the input stream.
5203 *
5204 * Stores characters from is into @a __str until &apos;\n&apos; is
5205 * found, the end of the stream is encountered, or str.max_size()
5206 * is reached. Any previous contents of @a __str are erased. If
5207 * end of line is encountered, it is extracted but not stored into
5208 * @a __str.
5209 */
5210 template<typename _CharT, typename _Traits, typename _Alloc>
5211 inline basic_istream<_CharT, _Traits>&
5212 getline(basic_istream<_CharT, _Traits>& __is,
5213 basic_string<_CharT, _Traits, _Alloc>& __str)
5214 { return std::getline(__is, __str, __is.widen('\n')); }
5215
5216#if __cplusplus >= 201103L
5217 /// Read a line from an rvalue stream into a string.
5218 template<typename _CharT, typename _Traits, typename _Alloc>
5219 inline basic_istream<_CharT, _Traits>&
5220 getline(basic_istream<_CharT, _Traits>&& __is,
5221 basic_string<_CharT, _Traits, _Alloc>& __str, _CharT __delim)
5222 { return std::getline(__is, __str, __delim); }
5223
5224 /// Read a line from an rvalue stream into a string.
5225 template<typename _CharT, typename _Traits, typename _Alloc>
5226 inline basic_istream<_CharT, _Traits>&
5227 getline(basic_istream<_CharT, _Traits>&& __is,
5228 basic_string<_CharT, _Traits, _Alloc>& __str)
5229 { return std::getline(__is, __str); }
5230#endif
5231
5232 template<>
5233 basic_istream<char>&
5234 getline(basic_istream<char>& __in, basic_string<char>& __str,
5235 char __delim);
5236
5237#ifdef _GLIBCXX_USE_WCHAR_T
5238 template<>
5239 basic_istream<wchar_t>&
5240 getline(basic_istream<wchar_t>& __in, basic_string<wchar_t>& __str,
5241 wchar_t __delim);
5242#endif
5243
5244_GLIBCXX_END_NAMESPACE_VERSION
5245} // namespace
5246
5247#if __cplusplus >= 201103L && defined(_GLIBCXX_USE_C99)
5248
5249#include <ext/string_conversions.h>
5250
5251namespace std _GLIBCXX_VISIBILITY(default)
5252{
5253_GLIBCXX_BEGIN_NAMESPACE_VERSION
5254_GLIBCXX_BEGIN_NAMESPACE_CXX11
5255
5256 // 21.4 Numeric Conversions [string.conversions].
5257 inline int
5258 stoi(const string& __str, size_t* __idx = 0, int __base = 10)
5259 { return __gnu_cxx::__stoa<long, int>(&std::strtol, "stoi", __str.c_str(),
5260 __idx, __base); }
5261
5262 inline long
5263 stol(const string& __str, size_t* __idx = 0, int __base = 10)
5264 { return __gnu_cxx::__stoa(&std::strtol, "stol", __str.c_str(),
5265 __idx, __base); }
5266
5267 inline unsigned long
5268 stoul(const string& __str, size_t* __idx = 0, int __base = 10)
5269 { return __gnu_cxx::__stoa(&std::strtoul, "stoul", __str.c_str(),
5270 __idx, __base); }
5271
5272 inline long long
5273 stoll(const string& __str, size_t* __idx = 0, int __base = 10)
5274 { return __gnu_cxx::__stoa(&std::strtoll, "stoll", __str.c_str(),
5275 __idx, __base); }
5276
5277 inline unsigned long long
5278 stoull(const string& __str, size_t* __idx = 0, int __base = 10)
5279 { return __gnu_cxx::__stoa(&std::strtoull, "stoull", __str.c_str(),
5280 __idx, __base); }
5281
5282 // NB: strtof vs strtod.
5283 inline float
5284 stof(const string& __str, size_t* __idx = 0)
5285 { return __gnu_cxx::__stoa(&std::strtof, "stof", __str.c_str(), __idx); }
5286
5287 inline double
5288 stod(const string& __str, size_t* __idx = 0)
5289 { return __gnu_cxx::__stoa(&std::strtod, "stod", __str.c_str(), __idx); }
5290
5291 inline long double
5292 stold(const string& __str, size_t* __idx = 0)
5293 { return __gnu_cxx::__stoa(&std::strtold, "stold", __str.c_str(), __idx); }
5294
5295 // NB: (v)snprintf vs sprintf.
5296
5297 // DR 1261.
5298 inline string
5299 to_string(int __val)
5300 { return __gnu_cxx::__to_xstring<string>(&std::vsnprintf, 4 * sizeof(int),
5301 "%d", __val); }
5302
5303 inline string
5304 to_string(unsigned __val)
5305 { return __gnu_cxx::__to_xstring<string>(&std::vsnprintf,
5306 4 * sizeof(unsigned),
5307 "%u", __val); }
5308
5309 inline string
5310 to_string(long __val)
5311 { return __gnu_cxx::__to_xstring<string>(&std::vsnprintf, 4 * sizeof(long),
5312 "%ld", __val); }
5313
5314 inline string
5315 to_string(unsigned long __val)
5316 { return __gnu_cxx::__to_xstring<string>(&std::vsnprintf,
5317 4 * sizeof(unsigned long),
5318 "%lu", __val); }
5319
5320 inline string
5321 to_string(long long __val)
5322 { return __gnu_cxx::__to_xstring<string>(&std::vsnprintf,
5323 4 * sizeof(long long),
5324 "%lld", __val); }
5325
5326 inline string
5327 to_string(unsigned long long __val)
5328 { return __gnu_cxx::__to_xstring<string>(&std::vsnprintf,
5329 4 * sizeof(unsigned long long),
5330 "%llu", __val); }
5331
5332 inline string
5333 to_string(float __val)
5334 {
5335 const int __n =
5336 __gnu_cxx::__numeric_traits<float>::__max_exponent10 + 20;
5337 return __gnu_cxx::__to_xstring<string>(&std::vsnprintf, __n,
5338 "%f", __val);
5339 }
5340
5341 inline string
5342 to_string(double __val)
5343 {
5344 const int __n =
5345 __gnu_cxx::__numeric_traits<double>::__max_exponent10 + 20;
5346 return __gnu_cxx::__to_xstring<string>(&std::vsnprintf, __n,
5347 "%f", __val);
5348 }
5349
5350 inline string
5351 to_string(long double __val)
5352 {
5353 const int __n =
5354 __gnu_cxx::__numeric_traits<long double>::__max_exponent10 + 20;
5355 return __gnu_cxx::__to_xstring<string>(&std::vsnprintf, __n,
5356 "%Lf", __val);
5357 }
5358
5359#ifdef _GLIBCXX_USE_WCHAR_T
5360 inline int
5361 stoi(const wstring& __str, size_t* __idx = 0, int __base = 10)
5362 { return __gnu_cxx::__stoa<long, int>(&std::wcstol, "stoi", __str.c_str(),
5363 __idx, __base); }
5364
5365 inline long
5366 stol(const wstring& __str, size_t* __idx = 0, int __base = 10)
5367 { return __gnu_cxx::__stoa(&std::wcstol, "stol", __str.c_str(),
5368 __idx, __base); }
5369
5370 inline unsigned long
5371 stoul(const wstring& __str, size_t* __idx = 0, int __base = 10)
5372 { return __gnu_cxx::__stoa(&std::wcstoul, "stoul", __str.c_str(),
5373 __idx, __base); }
5374
5375 inline long long
5376 stoll(const wstring& __str, size_t* __idx = 0, int __base = 10)
5377 { return __gnu_cxx::__stoa(&std::wcstoll, "stoll", __str.c_str(),
5378 __idx, __base); }
5379
5380 inline unsigned long long
5381 stoull(const wstring& __str, size_t* __idx = 0, int __base = 10)
5382 { return __gnu_cxx::__stoa(&std::wcstoull, "stoull", __str.c_str(),
5383 __idx, __base); }
5384
5385 // NB: wcstof vs wcstod.
5386 inline float
5387 stof(const wstring& __str, size_t* __idx = 0)
5388 { return __gnu_cxx::__stoa(&std::wcstof, "stof", __str.c_str(), __idx); }
5389
5390 inline double
5391 stod(const wstring& __str, size_t* __idx = 0)
5392 { return __gnu_cxx::__stoa(&std::wcstod, "stod", __str.c_str(), __idx); }
5393
5394 inline long double
5395 stold(const wstring& __str, size_t* __idx = 0)
5396 { return __gnu_cxx::__stoa(&std::wcstold, "stold", __str.c_str(), __idx); }
5397
5398#ifndef _GLIBCXX_HAVE_BROKEN_VSWPRINTF
5399 // DR 1261.
5400 inline wstring
5401 to_wstring(int __val)
5402 { return __gnu_cxx::__to_xstring<wstring>(&std::vswprintf, 4 * sizeof(int),
5403 L"%d", __val); }
5404
5405 inline wstring
5406 to_wstring(unsigned __val)
5407 { return __gnu_cxx::__to_xstring<wstring>(&std::vswprintf,
5408 4 * sizeof(unsigned),
5409 L"%u", __val); }
5410
5411 inline wstring
5412 to_wstring(long __val)
5413 { return __gnu_cxx::__to_xstring<wstring>(&std::vswprintf, 4 * sizeof(long),
5414 L"%ld", __val); }
5415
5416 inline wstring
5417 to_wstring(unsigned long __val)
5418 { return __gnu_cxx::__to_xstring<wstring>(&std::vswprintf,
5419 4 * sizeof(unsigned long),
5420 L"%lu", __val); }
5421
5422 inline wstring
5423 to_wstring(long long __val)
5424 { return __gnu_cxx::__to_xstring<wstring>(&std::vswprintf,
5425 4 * sizeof(long long),
5426 L"%lld", __val); }
5427
5428 inline wstring
5429 to_wstring(unsigned long long __val)
5430 { return __gnu_cxx::__to_xstring<wstring>(&std::vswprintf,
5431 4 * sizeof(unsigned long long),
5432 L"%llu", __val); }
5433
5434 inline wstring
5435 to_wstring(float __val)
5436 {
5437 const int __n =
5438 __gnu_cxx::__numeric_traits<float>::__max_exponent10 + 20;
5439 return __gnu_cxx::__to_xstring<wstring>(&std::vswprintf, __n,
5440 L"%f", __val);
5441 }
5442
5443 inline wstring
5444 to_wstring(double __val)
5445 {
5446 const int __n =
5447 __gnu_cxx::__numeric_traits<double>::__max_exponent10 + 20;
5448 return __gnu_cxx::__to_xstring<wstring>(&std::vswprintf, __n,
5449 L"%f", __val);
5450 }
5451
5452 inline wstring
5453 to_wstring(long double __val)
5454 {
5455 const int __n =
5456 __gnu_cxx::__numeric_traits<long double>::__max_exponent10 + 20;
5457 return __gnu_cxx::__to_xstring<wstring>(&std::vswprintf, __n,
5458 L"%Lf", __val);
5459 }
5460#endif // _GLIBCXX_HAVE_BROKEN_VSWPRINTF
5461#endif
5462
5463_GLIBCXX_END_NAMESPACE_CXX11
5464_GLIBCXX_END_NAMESPACE_VERSION
5465} // namespace
5466
5467#endif /* C++11 && _GLIBCXX_USE_C99 ... */
5468
5469#if __cplusplus >= 201103L
5470
5471#include <bits/functional_hash.h>
5472
5473namespace std _GLIBCXX_VISIBILITY(default)
5474{
5475_GLIBCXX_BEGIN_NAMESPACE_VERSION
5476
5477 // DR 1182.
5478
5479#ifndef _GLIBCXX_COMPATIBILITY_CXX0X
5480 /// std::hash specialization for string.
5481 template<>
5482 struct hash<string>
5483 : public __hash_base<size_t, string>
5484 {
5485 size_t
5486 operator()(const string& __s) const noexcept
5487 { return std::_Hash_impl::hash(__s.data(), __s.length()); }
5488 };
5489
5490 template<>
5491 struct __is_fast_hash<hash<string>> : std::false_type
5492 { };
5493
5494#ifdef _GLIBCXX_USE_WCHAR_T
5495 /// std::hash specialization for wstring.
5496 template<>
5497 struct hash<wstring>
5498 : public __hash_base<size_t, wstring>
5499 {
5500 size_t
5501 operator()(const wstring& __s) const noexcept
5502 { return std::_Hash_impl::hash(__s.data(),
5503 __s.length() * sizeof(wchar_t)); }
5504 };
5505
5506 template<>
5507 struct __is_fast_hash<hash<wstring>> : std::false_type
5508 { };
5509#endif
5510#endif /* _GLIBCXX_COMPATIBILITY_CXX0X */
5511
5512#ifdef _GLIBCXX_USE_C99_STDINT_TR1
5513 /// std::hash specialization for u16string.
5514 template<>
5515 struct hash<u16string>
5516 : public __hash_base<size_t, u16string>
5517 {
5518 size_t
5519 operator()(const u16string& __s) const noexcept
5520 { return std::_Hash_impl::hash(__s.data(),
5521 __s.length() * sizeof(char16_t)); }
5522 };
5523
5524 template<>
5525 struct __is_fast_hash<hash<u16string>> : std::false_type
5526 { };
5527
5528 /// std::hash specialization for u32string.
5529 template<>
5530 struct hash<u32string>
5531 : public __hash_base<size_t, u32string>
5532 {
5533 size_t
5534 operator()(const u32string& __s) const noexcept
5535 { return std::_Hash_impl::hash(__s.data(),
5536 __s.length() * sizeof(char32_t)); }
5537 };
5538
5539 template<>
5540 struct __is_fast_hash<hash<u32string>> : std::false_type
5541 { };
5542#endif
5543
5544#if __cplusplus > 201103L
5545
5546#define __cpp_lib_string_udls 201304
5547
5548 inline namespace literals
5549 {
5550 inline namespace string_literals
5551 {
5552
5553 _GLIBCXX_DEFAULT_ABI_TAG
5554 inline basic_string<char>
5555 operator""s(const char* __str, size_t __len)
5556 { return basic_string<char>{__str, __len}; }
5557
5558#ifdef _GLIBCXX_USE_WCHAR_T
5559 _GLIBCXX_DEFAULT_ABI_TAG
5560 inline basic_string<wchar_t>
5561 operator""s(const wchar_t* __str, size_t __len)
5562 { return basic_string<wchar_t>{__str, __len}; }
5563#endif
5564
5565#ifdef _GLIBCXX_USE_C99_STDINT_TR1
5566 _GLIBCXX_DEFAULT_ABI_TAG
5567 inline basic_string<char16_t>
5568 operator""s(const char16_t* __str, size_t __len)
5569 { return basic_string<char16_t>{__str, __len}; }
5570
5571 _GLIBCXX_DEFAULT_ABI_TAG
5572 inline basic_string<char32_t>
5573 operator""s(const char32_t* __str, size_t __len)
5574 { return basic_string<char32_t>{__str, __len}; }
5575#endif
5576
5577 } // inline namespace string_literals
5578 } // inline namespace literals
5579
5580#endif // __cplusplus > 201103L
5581
5582_GLIBCXX_END_NAMESPACE_VERSION
5583} // namespace std
5584
5585#endif // C++11
5586
5587#endif /* _BASIC_STRING_H */
5588