1// Vector implementation -*- C++ -*-
2
3// Copyright (C) 2001-2016 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/*
26 *
27 * Copyright (c) 1994
28 * Hewlett-Packard Company
29 *
30 * Permission to use, copy, modify, distribute and sell this software
31 * and its documentation for any purpose is hereby granted without fee,
32 * provided that the above copyright notice appear in all copies and
33 * that both that copyright notice and this permission notice appear
34 * in supporting documentation. Hewlett-Packard Company makes no
35 * representations about the suitability of this software for any
36 * purpose. It is provided "as is" without express or implied warranty.
37 *
38 *
39 * Copyright (c) 1996
40 * Silicon Graphics Computer Systems, Inc.
41 *
42 * Permission to use, copy, modify, distribute and sell this software
43 * and its documentation for any purpose is hereby granted without fee,
44 * provided that the above copyright notice appear in all copies and
45 * that both that copyright notice and this permission notice appear
46 * in supporting documentation. Silicon Graphics makes no
47 * representations about the suitability of this software for any
48 * purpose. It is provided "as is" without express or implied warranty.
49 */
50
51/** @file bits/stl_vector.h
52 * This is an internal header file, included by other library headers.
53 * Do not attempt to use it directly. @headername{vector}
54 */
55
56#ifndef _STL_VECTOR_H
57#define _STL_VECTOR_H 1
58
59#include <bits/stl_iterator_base_funcs.h>
60#include <bits/functexcept.h>
61#include <bits/concept_check.h>
62#if __cplusplus >= 201103L
63#include <initializer_list>
64#endif
65
66namespace std _GLIBCXX_VISIBILITY(default)
67{
68_GLIBCXX_BEGIN_NAMESPACE_CONTAINER
69
70 /// See bits/stl_deque.h's _Deque_base for an explanation.
71 template<typename _Tp, typename _Alloc>
72 struct _Vector_base
73 {
74 typedef typename __gnu_cxx::__alloc_traits<_Alloc>::template
75 rebind<_Tp>::other _Tp_alloc_type;
76 typedef typename __gnu_cxx::__alloc_traits<_Tp_alloc_type>::pointer
77 pointer;
78
79 struct _Vector_impl
80 : public _Tp_alloc_type
81 {
82 pointer _M_start;
83 pointer _M_finish;
84 pointer _M_end_of_storage;
85
86 _Vector_impl()
87 : _Tp_alloc_type(), _M_start(), _M_finish(), _M_end_of_storage()
88 { }
89
90 _Vector_impl(_Tp_alloc_type const& __a) _GLIBCXX_NOEXCEPT
91 : _Tp_alloc_type(__a), _M_start(), _M_finish(), _M_end_of_storage()
92 { }
93
94#if __cplusplus >= 201103L
95 _Vector_impl(_Tp_alloc_type&& __a) noexcept
96 : _Tp_alloc_type(std::move(__a)),
97 _M_start(), _M_finish(), _M_end_of_storage()
98 { }
99#endif
100
101 void _M_swap_data(_Vector_impl& __x) _GLIBCXX_NOEXCEPT
102 {
103 std::swap(_M_start, __x._M_start);
104 std::swap(_M_finish, __x._M_finish);
105 std::swap(_M_end_of_storage, __x._M_end_of_storage);
106 }
107 };
108
109 public:
110 typedef _Alloc allocator_type;
111
112 _Tp_alloc_type&
113 _M_get_Tp_allocator() _GLIBCXX_NOEXCEPT
114 { return *static_cast<_Tp_alloc_type*>(&this->_M_impl); }
115
116 const _Tp_alloc_type&
117 _M_get_Tp_allocator() const _GLIBCXX_NOEXCEPT
118 { return *static_cast<const _Tp_alloc_type*>(&this->_M_impl); }
119
120 allocator_type
121 get_allocator() const _GLIBCXX_NOEXCEPT
122 { return allocator_type(_M_get_Tp_allocator()); }
123
124 _Vector_base()
125 : _M_impl() { }
126
127 _Vector_base(const allocator_type& __a) _GLIBCXX_NOEXCEPT
128 : _M_impl(__a) { }
129
130 _Vector_base(size_t __n)
131 : _M_impl()
132 { _M_create_storage(__n); }
133
134 _Vector_base(size_t __n, const allocator_type& __a)
135 : _M_impl(__a)
136 { _M_create_storage(__n); }
137
138#if __cplusplus >= 201103L
139 _Vector_base(_Tp_alloc_type&& __a) noexcept
140 : _M_impl(std::move(__a)) { }
141
142 _Vector_base(_Vector_base&& __x) noexcept
143 : _M_impl(std::move(__x._M_get_Tp_allocator()))
144 { this->_M_impl._M_swap_data(__x._M_impl); }
145
146 _Vector_base(_Vector_base&& __x, const allocator_type& __a)
147 : _M_impl(__a)
148 {
149 if (__x.get_allocator() == __a)
150 this->_M_impl._M_swap_data(__x._M_impl);
151 else
152 {
153 size_t __n = __x._M_impl._M_finish - __x._M_impl._M_start;
154 _M_create_storage(__n);
155 }
156 }
157#endif
158
159 ~_Vector_base() _GLIBCXX_NOEXCEPT
160 { _M_deallocate(this->_M_impl._M_start, this->_M_impl._M_end_of_storage
161 - this->_M_impl._M_start); }
162
163 public:
164 _Vector_impl _M_impl;
165
166 pointer
167 _M_allocate(size_t __n)
168 {
169 typedef __gnu_cxx::__alloc_traits<_Tp_alloc_type> _Tr;
170 return __n != 0 ? _Tr::allocate(_M_impl, __n) : pointer();
171 }
172
173 void
174 _M_deallocate(pointer __p, size_t __n)
175 {
176 typedef __gnu_cxx::__alloc_traits<_Tp_alloc_type> _Tr;
177 if (__p)
178 _Tr::deallocate(_M_impl, __p, __n);
179 }
180
181 private:
182 void
183 _M_create_storage(size_t __n)
184 {
185 this->_M_impl._M_start = this->_M_allocate(__n);
186 this->_M_impl._M_finish = this->_M_impl._M_start;
187 this->_M_impl._M_end_of_storage = this->_M_impl._M_start + __n;
188 }
189 };
190
191
192 /**
193 * @brief A standard container which offers fixed time access to
194 * individual elements in any order.
195 *
196 * @ingroup sequences
197 *
198 * @tparam _Tp Type of element.
199 * @tparam _Alloc Allocator type, defaults to allocator<_Tp>.
200 *
201 * Meets the requirements of a <a href="tables.html#65">container</a>, a
202 * <a href="tables.html#66">reversible container</a>, and a
203 * <a href="tables.html#67">sequence</a>, including the
204 * <a href="tables.html#68">optional sequence requirements</a> with the
205 * %exception of @c push_front and @c pop_front.
206 *
207 * In some terminology a %vector can be described as a dynamic
208 * C-style array, it offers fast and efficient access to individual
209 * elements in any order and saves the user from worrying about
210 * memory and size allocation. Subscripting ( @c [] ) access is
211 * also provided as with C-style arrays.
212 */
213 template<typename _Tp, typename _Alloc = std::allocator<_Tp> >
214 class vector : protected _Vector_base<_Tp, _Alloc>
215 {
216 // Concept requirements.
217 typedef typename _Alloc::value_type _Alloc_value_type;
218#if __cplusplus < 201103L
219 __glibcxx_class_requires(_Tp, _SGIAssignableConcept)
220#endif
221 __glibcxx_class_requires2(_Tp, _Alloc_value_type, _SameTypeConcept)
222
223 typedef _Vector_base<_Tp, _Alloc> _Base;
224 typedef typename _Base::_Tp_alloc_type _Tp_alloc_type;
225 typedef __gnu_cxx::__alloc_traits<_Tp_alloc_type> _Alloc_traits;
226
227 public:
228 typedef _Tp value_type;
229 typedef typename _Base::pointer pointer;
230 typedef typename _Alloc_traits::const_pointer const_pointer;
231 typedef typename _Alloc_traits::reference reference;
232 typedef typename _Alloc_traits::const_reference const_reference;
233 typedef __gnu_cxx::__normal_iterator<pointer, vector> iterator;
234 typedef __gnu_cxx::__normal_iterator<const_pointer, vector>
235 const_iterator;
236 typedef std::reverse_iterator<const_iterator> const_reverse_iterator;
237 typedef std::reverse_iterator<iterator> reverse_iterator;
238 typedef size_t size_type;
239 typedef ptrdiff_t difference_type;
240 typedef _Alloc allocator_type;
241
242 protected:
243 using _Base::_M_allocate;
244 using _Base::_M_deallocate;
245 using _Base::_M_impl;
246 using _Base::_M_get_Tp_allocator;
247
248 public:
249 // [23.2.4.1] construct/copy/destroy
250 // (assign() and get_allocator() are also listed in this section)
251
252 /**
253 * @brief Creates a %vector with no elements.
254 */
255 vector()
256#if __cplusplus >= 201103L
257 noexcept(is_nothrow_default_constructible<_Alloc>::value)
258#endif
259 : _Base() { }
260
261 /**
262 * @brief Creates a %vector with no elements.
263 * @param __a An allocator object.
264 */
265 explicit
266 vector(const allocator_type& __a) _GLIBCXX_NOEXCEPT
267 : _Base(__a) { }
268
269#if __cplusplus >= 201103L
270 /**
271 * @brief Creates a %vector with default constructed elements.
272 * @param __n The number of elements to initially create.
273 * @param __a An allocator.
274 *
275 * This constructor fills the %vector with @a __n default
276 * constructed elements.
277 */
278 explicit
279 vector(size_type __n, const allocator_type& __a = allocator_type())
280 : _Base(__n, __a)
281 { _M_default_initialize(__n); }
282
283 /**
284 * @brief Creates a %vector with copies of an exemplar element.
285 * @param __n The number of elements to initially create.
286 * @param __value An element to copy.
287 * @param __a An allocator.
288 *
289 * This constructor fills the %vector with @a __n copies of @a __value.
290 */
291 vector(size_type __n, const value_type& __value,
292 const allocator_type& __a = allocator_type())
293 : _Base(__n, __a)
294 { _M_fill_initialize(__n, __value); }
295#else
296 /**
297 * @brief Creates a %vector with copies of an exemplar element.
298 * @param __n The number of elements to initially create.
299 * @param __value An element to copy.
300 * @param __a An allocator.
301 *
302 * This constructor fills the %vector with @a __n copies of @a __value.
303 */
304 explicit
305 vector(size_type __n, const value_type& __value = value_type(),
306 const allocator_type& __a = allocator_type())
307 : _Base(__n, __a)
308 { _M_fill_initialize(__n, __value); }
309#endif
310
311 /**
312 * @brief %Vector copy constructor.
313 * @param __x A %vector of identical element and allocator types.
314 *
315 * The newly-created %vector uses a copy of the allocation
316 * object used by @a __x. All the elements of @a __x are copied,
317 * but any extra memory in
318 * @a __x (for fast expansion) will not be copied.
319 */
320 vector(const vector& __x)
321 : _Base(__x.size(),
322 _Alloc_traits::_S_select_on_copy(__x._M_get_Tp_allocator()))
323 { this->_M_impl._M_finish =
324 std::__uninitialized_copy_a(__x.begin(), __x.end(),
325 this->_M_impl._M_start,
326 _M_get_Tp_allocator());
327 }
328
329#if __cplusplus >= 201103L
330 /**
331 * @brief %Vector move constructor.
332 * @param __x A %vector of identical element and allocator types.
333 *
334 * The newly-created %vector contains the exact contents of @a __x.
335 * The contents of @a __x are a valid, but unspecified %vector.
336 */
337 vector(vector&& __x) noexcept
338 : _Base(std::move(__x)) { }
339
340 /// Copy constructor with alternative allocator
341 vector(const vector& __x, const allocator_type& __a)
342 : _Base(__x.size(), __a)
343 { this->_M_impl._M_finish =
344 std::__uninitialized_copy_a(__x.begin(), __x.end(),
345 this->_M_impl._M_start,
346 _M_get_Tp_allocator());
347 }
348
349 /// Move constructor with alternative allocator
350 vector(vector&& __rv, const allocator_type& __m)
351 noexcept(_Alloc_traits::_S_always_equal())
352 : _Base(std::move(__rv), __m)
353 {
354 if (__rv.get_allocator() != __m)
355 {
356 this->_M_impl._M_finish =
357 std::__uninitialized_move_a(__rv.begin(), __rv.end(),
358 this->_M_impl._M_start,
359 _M_get_Tp_allocator());
360 __rv.clear();
361 }
362 }
363
364 /**
365 * @brief Builds a %vector from an initializer list.
366 * @param __l An initializer_list.
367 * @param __a An allocator.
368 *
369 * Create a %vector consisting of copies of the elements in the
370 * initializer_list @a __l.
371 *
372 * This will call the element type's copy constructor N times
373 * (where N is @a __l.size()) and do no memory reallocation.
374 */
375 vector(initializer_list<value_type> __l,
376 const allocator_type& __a = allocator_type())
377 : _Base(__a)
378 {
379 _M_range_initialize(__l.begin(), __l.end(),
380 random_access_iterator_tag());
381 }
382#endif
383
384 /**
385 * @brief Builds a %vector from a range.
386 * @param __first An input iterator.
387 * @param __last An input iterator.
388 * @param __a An allocator.
389 *
390 * Create a %vector consisting of copies of the elements from
391 * [first,last).
392 *
393 * If the iterators are forward, bidirectional, or
394 * random-access, then this will call the elements' copy
395 * constructor N times (where N is distance(first,last)) and do
396 * no memory reallocation. But if only input iterators are
397 * used, then this will do at most 2N calls to the copy
398 * constructor, and logN memory reallocations.
399 */
400#if __cplusplus >= 201103L
401 template<typename _InputIterator,
402 typename = std::_RequireInputIter<_InputIterator>>
403 vector(_InputIterator __first, _InputIterator __last,
404 const allocator_type& __a = allocator_type())
405 : _Base(__a)
406 { _M_initialize_dispatch(__first, __last, __false_type()); }
407#else
408 template<typename _InputIterator>
409 vector(_InputIterator __first, _InputIterator __last,
410 const allocator_type& __a = allocator_type())
411 : _Base(__a)
412 {
413 // Check whether it's an integral type. If so, it's not an iterator.
414 typedef typename std::__is_integer<_InputIterator>::__type _Integral;
415 _M_initialize_dispatch(__first, __last, _Integral());
416 }
417#endif
418
419 /**
420 * The dtor only erases the elements, and note that if the
421 * elements themselves are pointers, the pointed-to memory is
422 * not touched in any way. Managing the pointer is the user's
423 * responsibility.
424 */
425 ~vector() _GLIBCXX_NOEXCEPT
426 { std::_Destroy(this->_M_impl._M_start, this->_M_impl._M_finish,
427 _M_get_Tp_allocator()); }
428
429 /**
430 * @brief %Vector assignment operator.
431 * @param __x A %vector of identical element and allocator types.
432 *
433 * All the elements of @a __x are copied, but any extra memory in
434 * @a __x (for fast expansion) will not be copied. Unlike the
435 * copy constructor, the allocator object is not copied.
436 */
437 vector&
438 operator=(const vector& __x);
439
440#if __cplusplus >= 201103L
441 /**
442 * @brief %Vector move assignment operator.
443 * @param __x A %vector of identical element and allocator types.
444 *
445 * The contents of @a __x are moved into this %vector (without copying,
446 * if the allocators permit it).
447 * @a __x is a valid, but unspecified %vector.
448 */
449 vector&
450 operator=(vector&& __x) noexcept(_Alloc_traits::_S_nothrow_move())
451 {
452 constexpr bool __move_storage =
453 _Alloc_traits::_S_propagate_on_move_assign()
454 || _Alloc_traits::_S_always_equal();
455 _M_move_assign(std::move(__x), __bool_constant<__move_storage>());
456 return *this;
457 }
458
459 /**
460 * @brief %Vector list assignment operator.
461 * @param __l An initializer_list.
462 *
463 * This function fills a %vector with copies of the elements in the
464 * initializer list @a __l.
465 *
466 * Note that the assignment completely changes the %vector and
467 * that the resulting %vector's size is the same as the number
468 * of elements assigned. Old data may be lost.
469 */
470 vector&
471 operator=(initializer_list<value_type> __l)
472 {
473 this->assign(__l.begin(), __l.end());
474 return *this;
475 }
476#endif
477
478 /**
479 * @brief Assigns a given value to a %vector.
480 * @param __n Number of elements to be assigned.
481 * @param __val Value to be assigned.
482 *
483 * This function fills a %vector with @a __n copies of the given
484 * value. Note that the assignment completely changes the
485 * %vector and that the resulting %vector's size is the same as
486 * the number of elements assigned. Old data may be lost.
487 */
488 void
489 assign(size_type __n, const value_type& __val)
490 { _M_fill_assign(__n, __val); }
491
492 /**
493 * @brief Assigns a range to a %vector.
494 * @param __first An input iterator.
495 * @param __last An input iterator.
496 *
497 * This function fills a %vector with copies of the elements in the
498 * range [__first,__last).
499 *
500 * Note that the assignment completely changes the %vector and
501 * that the resulting %vector's size is the same as the number
502 * of elements assigned. Old data may be lost.
503 */
504#if __cplusplus >= 201103L
505 template<typename _InputIterator,
506 typename = std::_RequireInputIter<_InputIterator>>
507 void
508 assign(_InputIterator __first, _InputIterator __last)
509 { _M_assign_dispatch(__first, __last, __false_type()); }
510#else
511 template<typename _InputIterator>
512 void
513 assign(_InputIterator __first, _InputIterator __last)
514 {
515 // Check whether it's an integral type. If so, it's not an iterator.
516 typedef typename std::__is_integer<_InputIterator>::__type _Integral;
517 _M_assign_dispatch(__first, __last, _Integral());
518 }
519#endif
520
521#if __cplusplus >= 201103L
522 /**
523 * @brief Assigns an initializer list to a %vector.
524 * @param __l An initializer_list.
525 *
526 * This function fills a %vector with copies of the elements in the
527 * initializer list @a __l.
528 *
529 * Note that the assignment completely changes the %vector and
530 * that the resulting %vector's size is the same as the number
531 * of elements assigned. Old data may be lost.
532 */
533 void
534 assign(initializer_list<value_type> __l)
535 { this->assign(__l.begin(), __l.end()); }
536#endif
537
538 /// Get a copy of the memory allocation object.
539 using _Base::get_allocator;
540
541 // iterators
542 /**
543 * Returns a read/write iterator that points to the first
544 * element in the %vector. Iteration is done in ordinary
545 * element order.
546 */
547 iterator
548 begin() _GLIBCXX_NOEXCEPT
549 { return iterator(this->_M_impl._M_start); }
550
551 /**
552 * Returns a read-only (constant) iterator that points to the
553 * first element in the %vector. Iteration is done in ordinary
554 * element order.
555 */
556 const_iterator
557 begin() const _GLIBCXX_NOEXCEPT
558 { return const_iterator(this->_M_impl._M_start); }
559
560 /**
561 * Returns a read/write iterator that points one past the last
562 * element in the %vector. Iteration is done in ordinary
563 * element order.
564 */
565 iterator
566 end() _GLIBCXX_NOEXCEPT
567 { return iterator(this->_M_impl._M_finish); }
568
569 /**
570 * Returns a read-only (constant) iterator that points one past
571 * the last element in the %vector. Iteration is done in
572 * ordinary element order.
573 */
574 const_iterator
575 end() const _GLIBCXX_NOEXCEPT
576 { return const_iterator(this->_M_impl._M_finish); }
577
578 /**
579 * Returns a read/write reverse iterator that points to the
580 * last element in the %vector. Iteration is done in reverse
581 * element order.
582 */
583 reverse_iterator
584 rbegin() _GLIBCXX_NOEXCEPT
585 { return reverse_iterator(end()); }
586
587 /**
588 * Returns a read-only (constant) reverse iterator that points
589 * to the last element in the %vector. Iteration is done in
590 * reverse element order.
591 */
592 const_reverse_iterator
593 rbegin() const _GLIBCXX_NOEXCEPT
594 { return const_reverse_iterator(end()); }
595
596 /**
597 * Returns a read/write reverse iterator that points to one
598 * before the first element in the %vector. Iteration is done
599 * in reverse element order.
600 */
601 reverse_iterator
602 rend() _GLIBCXX_NOEXCEPT
603 { return reverse_iterator(begin()); }
604
605 /**
606 * Returns a read-only (constant) reverse iterator that points
607 * to one before the first element in the %vector. Iteration
608 * is done in reverse element order.
609 */
610 const_reverse_iterator
611 rend() const _GLIBCXX_NOEXCEPT
612 { return const_reverse_iterator(begin()); }
613
614#if __cplusplus >= 201103L
615 /**
616 * Returns a read-only (constant) iterator that points to the
617 * first element in the %vector. Iteration is done in ordinary
618 * element order.
619 */
620 const_iterator
621 cbegin() const noexcept
622 { return const_iterator(this->_M_impl._M_start); }
623
624 /**
625 * Returns a read-only (constant) iterator that points one past
626 * the last element in the %vector. Iteration is done in
627 * ordinary element order.
628 */
629 const_iterator
630 cend() const noexcept
631 { return const_iterator(this->_M_impl._M_finish); }
632
633 /**
634 * Returns a read-only (constant) reverse iterator that points
635 * to the last element in the %vector. Iteration is done in
636 * reverse element order.
637 */
638 const_reverse_iterator
639 crbegin() const noexcept
640 { return const_reverse_iterator(end()); }
641
642 /**
643 * Returns a read-only (constant) reverse iterator that points
644 * to one before the first element in the %vector. Iteration
645 * is done in reverse element order.
646 */
647 const_reverse_iterator
648 crend() const noexcept
649 { return const_reverse_iterator(begin()); }
650#endif
651
652 // [23.2.4.2] capacity
653 /** Returns the number of elements in the %vector. */
654 size_type
655 size() const _GLIBCXX_NOEXCEPT
656 { return size_type(this->_M_impl._M_finish - this->_M_impl._M_start); }
657
658 /** Returns the size() of the largest possible %vector. */
659 size_type
660 max_size() const _GLIBCXX_NOEXCEPT
661 { return _Alloc_traits::max_size(_M_get_Tp_allocator()); }
662
663#if __cplusplus >= 201103L
664 /**
665 * @brief Resizes the %vector to the specified number of elements.
666 * @param __new_size Number of elements the %vector should contain.
667 *
668 * This function will %resize the %vector to the specified
669 * number of elements. If the number is smaller than the
670 * %vector's current size the %vector is truncated, otherwise
671 * default constructed elements are appended.
672 */
673 void
674 resize(size_type __new_size)
675 {
676 if (__new_size > size())
677 _M_default_append(__new_size - size());
678 else if (__new_size < size())
679 _M_erase_at_end(this->_M_impl._M_start + __new_size);
680 }
681
682 /**
683 * @brief Resizes the %vector to the specified number of elements.
684 * @param __new_size Number of elements the %vector should contain.
685 * @param __x Data with which new elements should be populated.
686 *
687 * This function will %resize the %vector to the specified
688 * number of elements. If the number is smaller than the
689 * %vector's current size the %vector is truncated, otherwise
690 * the %vector is extended and new elements are populated with
691 * given data.
692 */
693 void
694 resize(size_type __new_size, const value_type& __x)
695 {
696 if (__new_size > size())
697 insert(end(), __new_size - size(), __x);
698 else if (__new_size < size())
699 _M_erase_at_end(this->_M_impl._M_start + __new_size);
700 }
701#else
702 /**
703 * @brief Resizes the %vector to the specified number of elements.
704 * @param __new_size Number of elements the %vector should contain.
705 * @param __x Data with which new elements should be populated.
706 *
707 * This function will %resize the %vector to the specified
708 * number of elements. If the number is smaller than the
709 * %vector's current size the %vector is truncated, otherwise
710 * the %vector is extended and new elements are populated with
711 * given data.
712 */
713 void
714 resize(size_type __new_size, value_type __x = value_type())
715 {
716 if (__new_size > size())
717 insert(end(), __new_size - size(), __x);
718 else if (__new_size < size())
719 _M_erase_at_end(this->_M_impl._M_start + __new_size);
720 }
721#endif
722
723#if __cplusplus >= 201103L
724 /** A non-binding request to reduce capacity() to size(). */
725 void
726 shrink_to_fit()
727 { _M_shrink_to_fit(); }
728#endif
729
730 /**
731 * Returns the total number of elements that the %vector can
732 * hold before needing to allocate more memory.
733 */
734 size_type
735 capacity() const _GLIBCXX_NOEXCEPT
736 { return size_type(this->_M_impl._M_end_of_storage
737 - this->_M_impl._M_start); }
738
739 /**
740 * Returns true if the %vector is empty. (Thus begin() would
741 * equal end().)
742 */
743 bool
744 empty() const _GLIBCXX_NOEXCEPT
745 { return begin() == end(); }
746
747 /**
748 * @brief Attempt to preallocate enough memory for specified number of
749 * elements.
750 * @param __n Number of elements required.
751 * @throw std::length_error If @a n exceeds @c max_size().
752 *
753 * This function attempts to reserve enough memory for the
754 * %vector to hold the specified number of elements. If the
755 * number requested is more than max_size(), length_error is
756 * thrown.
757 *
758 * The advantage of this function is that if optimal code is a
759 * necessity and the user can determine the number of elements
760 * that will be required, the user can reserve the memory in
761 * %advance, and thus prevent a possible reallocation of memory
762 * and copying of %vector data.
763 */
764 void
765 reserve(size_type __n);
766
767 // element access
768 /**
769 * @brief Subscript access to the data contained in the %vector.
770 * @param __n The index of the element for which data should be
771 * accessed.
772 * @return Read/write reference to data.
773 *
774 * This operator allows for easy, array-style, data access.
775 * Note that data access with this operator is unchecked and
776 * out_of_range lookups are not defined. (For checked lookups
777 * see at().)
778 */
779 reference
780 operator[](size_type __n) _GLIBCXX_NOEXCEPT
781 { return *(this->_M_impl._M_start + __n); }
782
783 /**
784 * @brief Subscript access to the data contained in the %vector.
785 * @param __n The index of the element for which data should be
786 * accessed.
787 * @return Read-only (constant) reference to data.
788 *
789 * This operator allows for easy, array-style, data access.
790 * Note that data access with this operator is unchecked and
791 * out_of_range lookups are not defined. (For checked lookups
792 * see at().)
793 */
794 const_reference
795 operator[](size_type __n) const _GLIBCXX_NOEXCEPT
796 { return *(this->_M_impl._M_start + __n); }
797
798 protected:
799 /// Safety check used only from at().
800 void
801 _M_range_check(size_type __n) const
802 {
803 if (__n >= this->size())
804 __throw_out_of_range_fmt(__N("vector::_M_range_check: __n "
805 "(which is %zu) >= this->size() "
806 "(which is %zu)"),
807 __n, this->size());
808 }
809
810 public:
811 /**
812 * @brief Provides access to the data contained in the %vector.
813 * @param __n The index of the element for which data should be
814 * accessed.
815 * @return Read/write reference to data.
816 * @throw std::out_of_range If @a __n is an invalid index.
817 *
818 * This function provides for safer data access. The parameter
819 * is first checked that it is in the range of the vector. The
820 * function throws out_of_range if the check fails.
821 */
822 reference
823 at(size_type __n)
824 {
825 _M_range_check(__n);
826 return (*this)[__n];
827 }
828
829 /**
830 * @brief Provides access to the data contained in the %vector.
831 * @param __n The index of the element for which data should be
832 * accessed.
833 * @return Read-only (constant) reference to data.
834 * @throw std::out_of_range If @a __n is an invalid index.
835 *
836 * This function provides for safer data access. The parameter
837 * is first checked that it is in the range of the vector. The
838 * function throws out_of_range if the check fails.
839 */
840 const_reference
841 at(size_type __n) const
842 {
843 _M_range_check(__n);
844 return (*this)[__n];
845 }
846
847 /**
848 * Returns a read/write reference to the data at the first
849 * element of the %vector.
850 */
851 reference
852 front() _GLIBCXX_NOEXCEPT
853 { return *begin(); }
854
855 /**
856 * Returns a read-only (constant) reference to the data at the first
857 * element of the %vector.
858 */
859 const_reference
860 front() const _GLIBCXX_NOEXCEPT
861 { return *begin(); }
862
863 /**
864 * Returns a read/write reference to the data at the last
865 * element of the %vector.
866 */
867 reference
868 back() _GLIBCXX_NOEXCEPT
869 { return *(end() - 1); }
870
871 /**
872 * Returns a read-only (constant) reference to the data at the
873 * last element of the %vector.
874 */
875 const_reference
876 back() const _GLIBCXX_NOEXCEPT
877 { return *(end() - 1); }
878
879 // _GLIBCXX_RESOLVE_LIB_DEFECTS
880 // DR 464. Suggestion for new member functions in standard containers.
881 // data access
882 /**
883 * Returns a pointer such that [data(), data() + size()) is a valid
884 * range. For a non-empty %vector, data() == &front().
885 */
886#if __cplusplus >= 201103L
887 _Tp*
888#else
889 pointer
890#endif
891 data() _GLIBCXX_NOEXCEPT
892 { return _M_data_ptr(this->_M_impl._M_start); }
893
894#if __cplusplus >= 201103L
895 const _Tp*
896#else
897 const_pointer
898#endif
899 data() const _GLIBCXX_NOEXCEPT
900 { return _M_data_ptr(this->_M_impl._M_start); }
901
902 // [23.2.4.3] modifiers
903 /**
904 * @brief Add data to the end of the %vector.
905 * @param __x Data to be added.
906 *
907 * This is a typical stack operation. The function creates an
908 * element at the end of the %vector and assigns the given data
909 * to it. Due to the nature of a %vector this operation can be
910 * done in constant time if the %vector has preallocated space
911 * available.
912 */
913 void
914 push_back(const value_type& __x)
915 {
916 if (this->_M_impl._M_finish != this->_M_impl._M_end_of_storage)
917 {
918 _Alloc_traits::construct(this->_M_impl, this->_M_impl._M_finish,
919 __x);
920 ++this->_M_impl._M_finish;
921 }
922 else
923#if __cplusplus >= 201103L
924 _M_emplace_back_aux(__x);
925#else
926 _M_insert_aux(end(), __x);
927#endif
928 }
929
930#if __cplusplus >= 201103L
931 void
932 push_back(value_type&& __x)
933 { emplace_back(std::move(__x)); }
934
935 template<typename... _Args>
936 void
937 emplace_back(_Args&&... __args);
938#endif
939
940 /**
941 * @brief Removes last element.
942 *
943 * This is a typical stack operation. It shrinks the %vector by one.
944 *
945 * Note that no data is returned, and if the last element's
946 * data is needed, it should be retrieved before pop_back() is
947 * called.
948 */
949 void
950 pop_back() _GLIBCXX_NOEXCEPT
951 {
952 --this->_M_impl._M_finish;
953 _Alloc_traits::destroy(this->_M_impl, this->_M_impl._M_finish);
954 }
955
956#if __cplusplus >= 201103L
957 /**
958 * @brief Inserts an object in %vector before specified iterator.
959 * @param __position A const_iterator into the %vector.
960 * @param __args Arguments.
961 * @return An iterator that points to the inserted data.
962 *
963 * This function will insert an object of type T constructed
964 * with T(std::forward<Args>(args)...) before the specified location.
965 * Note that this kind of operation could be expensive for a %vector
966 * and if it is frequently used the user should consider using
967 * std::list.
968 */
969 template<typename... _Args>
970 iterator
971 emplace(const_iterator __position, _Args&&... __args);
972
973 /**
974 * @brief Inserts given value into %vector before specified iterator.
975 * @param __position A const_iterator into the %vector.
976 * @param __x Data to be inserted.
977 * @return An iterator that points to the inserted data.
978 *
979 * This function will insert a copy of the given value before
980 * the specified location. Note that this kind of operation
981 * could be expensive for a %vector and if it is frequently
982 * used the user should consider using std::list.
983 */
984 iterator
985 insert(const_iterator __position, const value_type& __x);
986#else
987 /**
988 * @brief Inserts given value into %vector before specified iterator.
989 * @param __position An iterator into the %vector.
990 * @param __x Data to be inserted.
991 * @return An iterator that points to the inserted data.
992 *
993 * This function will insert a copy of the given value before
994 * the specified location. Note that this kind of operation
995 * could be expensive for a %vector and if it is frequently
996 * used the user should consider using std::list.
997 */
998 iterator
999 insert(iterator __position, const value_type& __x);
1000#endif
1001
1002#if __cplusplus >= 201103L
1003 /**
1004 * @brief Inserts given rvalue into %vector before specified iterator.
1005 * @param __position A const_iterator into the %vector.
1006 * @param __x Data to be inserted.
1007 * @return An iterator that points to the inserted data.
1008 *
1009 * This function will insert a copy of the given rvalue before
1010 * the specified location. Note that this kind of operation
1011 * could be expensive for a %vector and if it is frequently
1012 * used the user should consider using std::list.
1013 */
1014 iterator
1015 insert(const_iterator __position, value_type&& __x)
1016 { return emplace(__position, std::move(__x)); }
1017
1018 /**
1019 * @brief Inserts an initializer_list into the %vector.
1020 * @param __position An iterator into the %vector.
1021 * @param __l An initializer_list.
1022 *
1023 * This function will insert copies of the data in the
1024 * initializer_list @a l into the %vector before the location
1025 * specified by @a position.
1026 *
1027 * Note that this kind of operation could be expensive for a
1028 * %vector and if it is frequently used the user should
1029 * consider using std::list.
1030 */
1031 iterator
1032 insert(const_iterator __position, initializer_list<value_type> __l)
1033 { return this->insert(__position, __l.begin(), __l.end()); }
1034#endif
1035
1036#if __cplusplus >= 201103L
1037 /**
1038 * @brief Inserts a number of copies of given data into the %vector.
1039 * @param __position A const_iterator into the %vector.
1040 * @param __n Number of elements to be inserted.
1041 * @param __x Data to be inserted.
1042 * @return An iterator that points to the inserted data.
1043 *
1044 * This function will insert a specified number of copies of
1045 * the given data before the location specified by @a position.
1046 *
1047 * Note that this kind of operation could be expensive for a
1048 * %vector and if it is frequently used the user should
1049 * consider using std::list.
1050 */
1051 iterator
1052 insert(const_iterator __position, size_type __n, const value_type& __x)
1053 {
1054 difference_type __offset = __position - cbegin();
1055 _M_fill_insert(begin() + __offset, __n, __x);
1056 return begin() + __offset;
1057 }
1058#else
1059 /**
1060 * @brief Inserts a number of copies of given data into the %vector.
1061 * @param __position An iterator into the %vector.
1062 * @param __n Number of elements to be inserted.
1063 * @param __x Data to be inserted.
1064 *
1065 * This function will insert a specified number of copies of
1066 * the given data before the location specified by @a position.
1067 *
1068 * Note that this kind of operation could be expensive for a
1069 * %vector and if it is frequently used the user should
1070 * consider using std::list.
1071 */
1072 void
1073 insert(iterator __position, size_type __n, const value_type& __x)
1074 { _M_fill_insert(__position, __n, __x); }
1075#endif
1076
1077#if __cplusplus >= 201103L
1078 /**
1079 * @brief Inserts a range into the %vector.
1080 * @param __position A const_iterator into the %vector.
1081 * @param __first An input iterator.
1082 * @param __last An input iterator.
1083 * @return An iterator that points to the inserted data.
1084 *
1085 * This function will insert copies of the data in the range
1086 * [__first,__last) into the %vector before the location specified
1087 * by @a pos.
1088 *
1089 * Note that this kind of operation could be expensive for a
1090 * %vector and if it is frequently used the user should
1091 * consider using std::list.
1092 */
1093 template<typename _InputIterator,
1094 typename = std::_RequireInputIter<_InputIterator>>
1095 iterator
1096 insert(const_iterator __position, _InputIterator __first,
1097 _InputIterator __last)
1098 {
1099 difference_type __offset = __position - cbegin();
1100 _M_insert_dispatch(begin() + __offset,
1101 __first, __last, __false_type());
1102 return begin() + __offset;
1103 }
1104#else
1105 /**
1106 * @brief Inserts a range into the %vector.
1107 * @param __position An iterator into the %vector.
1108 * @param __first An input iterator.
1109 * @param __last An input iterator.
1110 *
1111 * This function will insert copies of the data in the range
1112 * [__first,__last) into the %vector before the location specified
1113 * by @a pos.
1114 *
1115 * Note that this kind of operation could be expensive for a
1116 * %vector and if it is frequently used the user should
1117 * consider using std::list.
1118 */
1119 template<typename _InputIterator>
1120 void
1121 insert(iterator __position, _InputIterator __first,
1122 _InputIterator __last)
1123 {
1124 // Check whether it's an integral type. If so, it's not an iterator.
1125 typedef typename std::__is_integer<_InputIterator>::__type _Integral;
1126 _M_insert_dispatch(__position, __first, __last, _Integral());
1127 }
1128#endif
1129
1130 /**
1131 * @brief Remove element at given position.
1132 * @param __position Iterator pointing to element to be erased.
1133 * @return An iterator pointing to the next element (or end()).
1134 *
1135 * This function will erase the element at the given position and thus
1136 * shorten the %vector by one.
1137 *
1138 * Note This operation could be expensive and if it is
1139 * frequently used the user should consider using std::list.
1140 * The user is also cautioned that this function only erases
1141 * the element, and that if the element is itself a pointer,
1142 * the pointed-to memory is not touched in any way. Managing
1143 * the pointer is the user's responsibility.
1144 */
1145 iterator
1146#if __cplusplus >= 201103L
1147 erase(const_iterator __position)
1148 { return _M_erase(begin() + (__position - cbegin())); }
1149#else
1150 erase(iterator __position)
1151 { return _M_erase(__position); }
1152#endif
1153
1154 /**
1155 * @brief Remove a range of elements.
1156 * @param __first Iterator pointing to the first element to be erased.
1157 * @param __last Iterator pointing to one past the last element to be
1158 * erased.
1159 * @return An iterator pointing to the element pointed to by @a __last
1160 * prior to erasing (or end()).
1161 *
1162 * This function will erase the elements in the range
1163 * [__first,__last) and shorten the %vector accordingly.
1164 *
1165 * Note This operation could be expensive and if it is
1166 * frequently used the user should consider using std::list.
1167 * The user is also cautioned that this function only erases
1168 * the elements, and that if the elements themselves are
1169 * pointers, the pointed-to memory is not touched in any way.
1170 * Managing the pointer is the user's responsibility.
1171 */
1172 iterator
1173#if __cplusplus >= 201103L
1174 erase(const_iterator __first, const_iterator __last)
1175 {
1176 const auto __beg = begin();
1177 const auto __cbeg = cbegin();
1178 return _M_erase(__beg + (__first - __cbeg), __beg + (__last - __cbeg));
1179 }
1180#else
1181 erase(iterator __first, iterator __last)
1182 { return _M_erase(__first, __last); }
1183#endif
1184
1185 /**
1186 * @brief Swaps data with another %vector.
1187 * @param __x A %vector of the same element and allocator types.
1188 *
1189 * This exchanges the elements between two vectors in constant time.
1190 * (Three pointers, so it should be quite fast.)
1191 * Note that the global std::swap() function is specialized such that
1192 * std::swap(v1,v2) will feed to this function.
1193 */
1194 void
1195 swap(vector& __x) _GLIBCXX_NOEXCEPT
1196 {
1197 this->_M_impl._M_swap_data(__x._M_impl);
1198 _Alloc_traits::_S_on_swap(_M_get_Tp_allocator(),
1199 __x._M_get_Tp_allocator());
1200 }
1201
1202 /**
1203 * Erases all the elements. Note that this function only erases the
1204 * elements, and that if the elements themselves are pointers, the
1205 * pointed-to memory is not touched in any way. Managing the pointer is
1206 * the user's responsibility.
1207 */
1208 void
1209 clear() _GLIBCXX_NOEXCEPT
1210 { _M_erase_at_end(this->_M_impl._M_start); }
1211
1212 protected:
1213 /**
1214 * Memory expansion handler. Uses the member allocation function to
1215 * obtain @a n bytes of memory, and then copies [first,last) into it.
1216 */
1217 template<typename _ForwardIterator>
1218 pointer
1219 _M_allocate_and_copy(size_type __n,
1220 _ForwardIterator __first, _ForwardIterator __last)
1221 {
1222 pointer __result = this->_M_allocate(__n);
1223 __try
1224 {
1225 std::__uninitialized_copy_a(__first, __last, __result,
1226 _M_get_Tp_allocator());
1227 return __result;
1228 }
1229 __catch(...)
1230 {
1231 _M_deallocate(__result, __n);
1232 __throw_exception_again;
1233 }
1234 }
1235
1236
1237 // Internal constructor functions follow.
1238
1239 // Called by the range constructor to implement [23.1.1]/9
1240
1241 // _GLIBCXX_RESOLVE_LIB_DEFECTS
1242 // 438. Ambiguity in the "do the right thing" clause
1243 template<typename _Integer>
1244 void
1245 _M_initialize_dispatch(_Integer __n, _Integer __value, __true_type)
1246 {
1247 this->_M_impl._M_start = _M_allocate(static_cast<size_type>(__n));
1248 this->_M_impl._M_end_of_storage =
1249 this->_M_impl._M_start + static_cast<size_type>(__n);
1250 _M_fill_initialize(static_cast<size_type>(__n), __value);
1251 }
1252
1253 // Called by the range constructor to implement [23.1.1]/9
1254 template<typename _InputIterator>
1255 void
1256 _M_initialize_dispatch(_InputIterator __first, _InputIterator __last,
1257 __false_type)
1258 {
1259 typedef typename std::iterator_traits<_InputIterator>::
1260 iterator_category _IterCategory;
1261 _M_range_initialize(__first, __last, _IterCategory());
1262 }
1263
1264 // Called by the second initialize_dispatch above
1265 template<typename _InputIterator>
1266 void
1267 _M_range_initialize(_InputIterator __first,
1268 _InputIterator __last, std::input_iterator_tag)
1269 {
1270 for (; __first != __last; ++__first)
1271#if __cplusplus >= 201103L
1272 emplace_back(*__first);
1273#else
1274 push_back(*__first);
1275#endif
1276 }
1277
1278 // Called by the second initialize_dispatch above
1279 template<typename _ForwardIterator>
1280 void
1281 _M_range_initialize(_ForwardIterator __first,
1282 _ForwardIterator __last, std::forward_iterator_tag)
1283 {
1284 const size_type __n = std::distance(__first, __last);
1285 this->_M_impl._M_start = this->_M_allocate(__n);
1286 this->_M_impl._M_end_of_storage = this->_M_impl._M_start + __n;
1287 this->_M_impl._M_finish =
1288 std::__uninitialized_copy_a(__first, __last,
1289 this->_M_impl._M_start,
1290 _M_get_Tp_allocator());
1291 }
1292
1293 // Called by the first initialize_dispatch above and by the
1294 // vector(n,value,a) constructor.
1295 void
1296 _M_fill_initialize(size_type __n, const value_type& __value)
1297 {
1298 this->_M_impl._M_finish =
1299 std::__uninitialized_fill_n_a(this->_M_impl._M_start, __n, __value,
1300 _M_get_Tp_allocator());
1301 }
1302
1303#if __cplusplus >= 201103L
1304 // Called by the vector(n) constructor.
1305 void
1306 _M_default_initialize(size_type __n)
1307 {
1308 this->_M_impl._M_finish =
1309 std::__uninitialized_default_n_a(this->_M_impl._M_start, __n,
1310 _M_get_Tp_allocator());
1311 }
1312#endif
1313
1314 // Internal assign functions follow. The *_aux functions do the actual
1315 // assignment work for the range versions.
1316
1317 // Called by the range assign to implement [23.1.1]/9
1318
1319 // _GLIBCXX_RESOLVE_LIB_DEFECTS
1320 // 438. Ambiguity in the "do the right thing" clause
1321 template<typename _Integer>
1322 void
1323 _M_assign_dispatch(_Integer __n, _Integer __val, __true_type)
1324 { _M_fill_assign(__n, __val); }
1325
1326 // Called by the range assign to implement [23.1.1]/9
1327 template<typename _InputIterator>
1328 void
1329 _M_assign_dispatch(_InputIterator __first, _InputIterator __last,
1330 __false_type)
1331 {
1332 typedef typename std::iterator_traits<_InputIterator>::
1333 iterator_category _IterCategory;
1334 _M_assign_aux(__first, __last, _IterCategory());
1335 }
1336
1337 // Called by the second assign_dispatch above
1338 template<typename _InputIterator>
1339 void
1340 _M_assign_aux(_InputIterator __first, _InputIterator __last,
1341 std::input_iterator_tag);
1342
1343 // Called by the second assign_dispatch above
1344 template<typename _ForwardIterator>
1345 void
1346 _M_assign_aux(_ForwardIterator __first, _ForwardIterator __last,
1347 std::forward_iterator_tag);
1348
1349 // Called by assign(n,t), and the range assign when it turns out
1350 // to be the same thing.
1351 void
1352 _M_fill_assign(size_type __n, const value_type& __val);
1353
1354
1355 // Internal insert functions follow.
1356
1357 // Called by the range insert to implement [23.1.1]/9
1358
1359 // _GLIBCXX_RESOLVE_LIB_DEFECTS
1360 // 438. Ambiguity in the "do the right thing" clause
1361 template<typename _Integer>
1362 void
1363 _M_insert_dispatch(iterator __pos, _Integer __n, _Integer __val,
1364 __true_type)
1365 { _M_fill_insert(__pos, __n, __val); }
1366
1367 // Called by the range insert to implement [23.1.1]/9
1368 template<typename _InputIterator>
1369 void
1370 _M_insert_dispatch(iterator __pos, _InputIterator __first,
1371 _InputIterator __last, __false_type)
1372 {
1373 typedef typename std::iterator_traits<_InputIterator>::
1374 iterator_category _IterCategory;
1375 _M_range_insert(__pos, __first, __last, _IterCategory());
1376 }
1377
1378 // Called by the second insert_dispatch above
1379 template<typename _InputIterator>
1380 void
1381 _M_range_insert(iterator __pos, _InputIterator __first,
1382 _InputIterator __last, std::input_iterator_tag);
1383
1384 // Called by the second insert_dispatch above
1385 template<typename _ForwardIterator>
1386 void
1387 _M_range_insert(iterator __pos, _ForwardIterator __first,
1388 _ForwardIterator __last, std::forward_iterator_tag);
1389
1390 // Called by insert(p,n,x), and the range insert when it turns out to be
1391 // the same thing.
1392 void
1393 _M_fill_insert(iterator __pos, size_type __n, const value_type& __x);
1394
1395#if __cplusplus >= 201103L
1396 // Called by resize(n).
1397 void
1398 _M_default_append(size_type __n);
1399
1400 bool
1401 _M_shrink_to_fit();
1402#endif
1403
1404 // Called by insert(p,x)
1405#if __cplusplus < 201103L
1406 void
1407 _M_insert_aux(iterator __position, const value_type& __x);
1408#else
1409 template<typename... _Args>
1410 void
1411 _M_insert_aux(iterator __position, _Args&&... __args);
1412
1413 template<typename... _Args>
1414 void
1415 _M_emplace_back_aux(_Args&&... __args);
1416#endif
1417
1418 // Called by the latter.
1419 size_type
1420 _M_check_len(size_type __n, const char* __s) const
1421 {
1422 if (max_size() - size() < __n)
1423 __throw_length_error(__N(__s));
1424
1425 const size_type __len = size() + std::max(size(), __n);
1426 return (__len < size() || __len > max_size()) ? max_size() : __len;
1427 }
1428
1429 // Internal erase functions follow.
1430
1431 // Called by erase(q1,q2), clear(), resize(), _M_fill_assign,
1432 // _M_assign_aux.
1433 void
1434 _M_erase_at_end(pointer __pos) _GLIBCXX_NOEXCEPT
1435 {
1436 std::_Destroy(__pos, this->_M_impl._M_finish, _M_get_Tp_allocator());
1437 this->_M_impl._M_finish = __pos;
1438 }
1439
1440 iterator
1441 _M_erase(iterator __position);
1442
1443 iterator
1444 _M_erase(iterator __first, iterator __last);
1445
1446#if __cplusplus >= 201103L
1447 private:
1448 // Constant-time move assignment when source object's memory can be
1449 // moved, either because the source's allocator will move too
1450 // or because the allocators are equal.
1451 void
1452 _M_move_assign(vector&& __x, std::true_type) noexcept
1453 {
1454 vector __tmp(get_allocator());
1455 this->_M_impl._M_swap_data(__tmp._M_impl);
1456 this->_M_impl._M_swap_data(__x._M_impl);
1457 std::__alloc_on_move(_M_get_Tp_allocator(), __x._M_get_Tp_allocator());
1458 }
1459
1460 // Do move assignment when it might not be possible to move source
1461 // object's memory, resulting in a linear-time operation.
1462 void
1463 _M_move_assign(vector&& __x, std::false_type)
1464 {
1465 if (__x._M_get_Tp_allocator() == this->_M_get_Tp_allocator())
1466 _M_move_assign(std::move(__x), std::true_type());
1467 else
1468 {
1469 // The rvalue's allocator cannot be moved and is not equal,
1470 // so we need to individually move each element.
1471 this->assign(std::__make_move_if_noexcept_iterator(__x.begin()),
1472 std::__make_move_if_noexcept_iterator(__x.end()));
1473 __x.clear();
1474 }
1475 }
1476#endif
1477
1478#if __cplusplus >= 201103L
1479 template<typename _Up>
1480 _Up*
1481 _M_data_ptr(_Up* __ptr) const
1482 { return __ptr; }
1483
1484 template<typename _Ptr>
1485 typename std::pointer_traits<_Ptr>::element_type*
1486 _M_data_ptr(_Ptr __ptr) const
1487 { return empty() ? nullptr : std::__addressof(*__ptr); }
1488#else
1489 template<typename _Ptr>
1490 _Ptr
1491 _M_data_ptr(_Ptr __ptr) const
1492 { return __ptr; }
1493#endif
1494 };
1495
1496
1497 /**
1498 * @brief Vector equality comparison.
1499 * @param __x A %vector.
1500 * @param __y A %vector of the same type as @a __x.
1501 * @return True iff the size and elements of the vectors are equal.
1502 *
1503 * This is an equivalence relation. It is linear in the size of the
1504 * vectors. Vectors are considered equivalent if their sizes are equal,
1505 * and if corresponding elements compare equal.
1506 */
1507 template<typename _Tp, typename _Alloc>
1508 inline bool
1509 operator==(const vector<_Tp, _Alloc>& __x, const vector<_Tp, _Alloc>& __y)
1510 { return (__x.size() == __y.size()
1511 && std::equal(__x.begin(), __x.end(), __y.begin())); }
1512
1513 /**
1514 * @brief Vector ordering relation.
1515 * @param __x A %vector.
1516 * @param __y A %vector of the same type as @a __x.
1517 * @return True iff @a __x is lexicographically less than @a __y.
1518 *
1519 * This is a total ordering relation. It is linear in the size of the
1520 * vectors. The elements must be comparable with @c <.
1521 *
1522 * See std::lexicographical_compare() for how the determination is made.
1523 */
1524 template<typename _Tp, typename _Alloc>
1525 inline bool
1526 operator<(const vector<_Tp, _Alloc>& __x, const vector<_Tp, _Alloc>& __y)
1527 { return std::lexicographical_compare(__x.begin(), __x.end(),
1528 __y.begin(), __y.end()); }
1529
1530 /// Based on operator==
1531 template<typename _Tp, typename _Alloc>
1532 inline bool
1533 operator!=(const vector<_Tp, _Alloc>& __x, const vector<_Tp, _Alloc>& __y)
1534 { return !(__x == __y); }
1535
1536 /// Based on operator<
1537 template<typename _Tp, typename _Alloc>
1538 inline bool
1539 operator>(const vector<_Tp, _Alloc>& __x, const vector<_Tp, _Alloc>& __y)
1540 { return __y < __x; }
1541
1542 /// Based on operator<
1543 template<typename _Tp, typename _Alloc>
1544 inline bool
1545 operator<=(const vector<_Tp, _Alloc>& __x, const vector<_Tp, _Alloc>& __y)
1546 { return !(__y < __x); }
1547
1548 /// Based on operator<
1549 template<typename _Tp, typename _Alloc>
1550 inline bool
1551 operator>=(const vector<_Tp, _Alloc>& __x, const vector<_Tp, _Alloc>& __y)
1552 { return !(__x < __y); }
1553
1554 /// See std::vector::swap().
1555 template<typename _Tp, typename _Alloc>
1556 inline void
1557 swap(vector<_Tp, _Alloc>& __x, vector<_Tp, _Alloc>& __y)
1558 _GLIBCXX_NOEXCEPT_IF(noexcept(__x.swap(__y)))
1559 { __x.swap(__y); }
1560
1561_GLIBCXX_END_NAMESPACE_CONTAINER
1562} // namespace std
1563
1564#endif /* _STL_VECTOR_H */
1565