1 | // Locale support -*- C++ -*- |
2 | |
3 | // Copyright (C) 1997-2014 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/locale_classes.h |
26 | * This is an internal header file, included by other library headers. |
27 | * Do not attempt to use it directly. @headername{locale} |
28 | */ |
29 | |
30 | // |
31 | // ISO C++ 14882: 22.1 Locales |
32 | // |
33 | |
34 | #ifndef _LOCALE_CLASSES_H |
35 | #define _LOCALE_CLASSES_H 1 |
36 | |
37 | #pragma GCC system_header |
38 | |
39 | #include <bits/localefwd.h> |
40 | #include <string> |
41 | #include <ext/atomicity.h> |
42 | |
43 | namespace std _GLIBCXX_VISIBILITY(default) |
44 | { |
45 | _GLIBCXX_BEGIN_NAMESPACE_VERSION |
46 | |
47 | // 22.1.1 Class locale |
48 | /** |
49 | * @brief Container class for localization functionality. |
50 | * @ingroup locales |
51 | * |
52 | * The locale class is first a class wrapper for C library locales. It is |
53 | * also an extensible container for user-defined localization. A locale is |
54 | * a collection of facets that implement various localization features such |
55 | * as money, time, and number printing. |
56 | * |
57 | * Constructing C++ locales does not change the C library locale. |
58 | * |
59 | * This library supports efficient construction and copying of locales |
60 | * through a reference counting implementation of the locale class. |
61 | */ |
62 | class locale |
63 | { |
64 | public: |
65 | // Types: |
66 | /// Definition of locale::category. |
67 | typedef int category; |
68 | |
69 | // Forward decls and friends: |
70 | class facet; |
71 | class id; |
72 | class _Impl; |
73 | |
74 | friend class facet; |
75 | friend class _Impl; |
76 | |
77 | template<typename _Facet> |
78 | friend bool |
79 | has_facet(const locale&) throw(); |
80 | |
81 | template<typename _Facet> |
82 | friend const _Facet& |
83 | use_facet(const locale&); |
84 | |
85 | template<typename _Cache> |
86 | friend struct __use_cache; |
87 | |
88 | //@{ |
89 | /** |
90 | * @brief Category values. |
91 | * |
92 | * The standard category values are none, ctype, numeric, collate, time, |
93 | * monetary, and messages. They form a bitmask that supports union and |
94 | * intersection. The category all is the union of these values. |
95 | * |
96 | * NB: Order must match _S_facet_categories definition in locale.cc |
97 | */ |
98 | static const category none = 0; |
99 | static const category ctype = 1L << 0; |
100 | static const category numeric = 1L << 1; |
101 | static const category collate = 1L << 2; |
102 | static const category time = 1L << 3; |
103 | static const category monetary = 1L << 4; |
104 | static const category messages = 1L << 5; |
105 | static const category all = (ctype | numeric | collate | |
106 | time | monetary | messages); |
107 | //@} |
108 | |
109 | // Construct/copy/destroy: |
110 | |
111 | /** |
112 | * @brief Default constructor. |
113 | * |
114 | * Constructs a copy of the global locale. If no locale has been |
115 | * explicitly set, this is the C locale. |
116 | */ |
117 | locale() throw(); |
118 | |
119 | /** |
120 | * @brief Copy constructor. |
121 | * |
122 | * Constructs a copy of @a other. |
123 | * |
124 | * @param __other The locale to copy. |
125 | */ |
126 | locale(const locale& __other) throw(); |
127 | |
128 | /** |
129 | * @brief Named locale constructor. |
130 | * |
131 | * Constructs a copy of the named C library locale. |
132 | * |
133 | * @param __s Name of the locale to construct. |
134 | * @throw std::runtime_error if __s is null or an undefined locale. |
135 | */ |
136 | explicit |
137 | locale(const char* __s); |
138 | |
139 | /** |
140 | * @brief Construct locale with facets from another locale. |
141 | * |
142 | * Constructs a copy of the locale @a base. The facets specified by @a |
143 | * cat are replaced with those from the locale named by @a s. If base is |
144 | * named, this locale instance will also be named. |
145 | * |
146 | * @param __base The locale to copy. |
147 | * @param __s Name of the locale to use facets from. |
148 | * @param __cat Set of categories defining the facets to use from __s. |
149 | * @throw std::runtime_error if __s is null or an undefined locale. |
150 | */ |
151 | locale(const locale& __base, const char* __s, category __cat); |
152 | |
153 | /** |
154 | * @brief Construct locale with facets from another locale. |
155 | * |
156 | * Constructs a copy of the locale @a base. The facets specified by @a |
157 | * cat are replaced with those from the locale @a add. If @a base and @a |
158 | * add are named, this locale instance will also be named. |
159 | * |
160 | * @param __base The locale to copy. |
161 | * @param __add The locale to use facets from. |
162 | * @param __cat Set of categories defining the facets to use from add. |
163 | */ |
164 | locale(const locale& __base, const locale& __add, category __cat); |
165 | |
166 | /** |
167 | * @brief Construct locale with another facet. |
168 | * |
169 | * Constructs a copy of the locale @a __other. The facet @a __f |
170 | * is added to @a __other, replacing an existing facet of type |
171 | * Facet if there is one. If @a __f is null, this locale is a |
172 | * copy of @a __other. |
173 | * |
174 | * @param __other The locale to copy. |
175 | * @param __f The facet to add in. |
176 | */ |
177 | template<typename _Facet> |
178 | locale(const locale& __other, _Facet* __f); |
179 | |
180 | /// Locale destructor. |
181 | ~locale() throw(); |
182 | |
183 | /** |
184 | * @brief Assignment operator. |
185 | * |
186 | * Set this locale to be a copy of @a other. |
187 | * |
188 | * @param __other The locale to copy. |
189 | * @return A reference to this locale. |
190 | */ |
191 | const locale& |
192 | operator=(const locale& __other) throw(); |
193 | |
194 | /** |
195 | * @brief Construct locale with another facet. |
196 | * |
197 | * Constructs and returns a new copy of this locale. Adds or replaces an |
198 | * existing facet of type Facet from the locale @a other into the new |
199 | * locale. |
200 | * |
201 | * @tparam _Facet The facet type to copy from other |
202 | * @param __other The locale to copy from. |
203 | * @return Newly constructed locale. |
204 | * @throw std::runtime_error if __other has no facet of type _Facet. |
205 | */ |
206 | template<typename _Facet> |
207 | locale |
208 | combine(const locale& __other) const; |
209 | |
210 | // Locale operations: |
211 | /** |
212 | * @brief Return locale name. |
213 | * @return Locale name or "*" if unnamed. |
214 | */ |
215 | string |
216 | name() const; |
217 | |
218 | /** |
219 | * @brief Locale equality. |
220 | * |
221 | * @param __other The locale to compare against. |
222 | * @return True if other and this refer to the same locale instance, are |
223 | * copies, or have the same name. False otherwise. |
224 | */ |
225 | bool |
226 | operator==(const locale& __other) const throw(); |
227 | |
228 | /** |
229 | * @brief Locale inequality. |
230 | * |
231 | * @param __other The locale to compare against. |
232 | * @return ! (*this == __other) |
233 | */ |
234 | bool |
235 | operator!=(const locale& __other) const throw() |
236 | { return !(this->operator==(__other)); } |
237 | |
238 | /** |
239 | * @brief Compare two strings according to collate. |
240 | * |
241 | * Template operator to compare two strings using the compare function of |
242 | * the collate facet in this locale. One use is to provide the locale to |
243 | * the sort function. For example, a vector v of strings could be sorted |
244 | * according to locale loc by doing: |
245 | * @code |
246 | * std::sort(v.begin(), v.end(), loc); |
247 | * @endcode |
248 | * |
249 | * @param __s1 First string to compare. |
250 | * @param __s2 Second string to compare. |
251 | * @return True if collate<_Char> facet compares __s1 < __s2, else false. |
252 | */ |
253 | template<typename _Char, typename _Traits, typename _Alloc> |
254 | bool |
255 | operator()(const basic_string<_Char, _Traits, _Alloc>& __s1, |
256 | const basic_string<_Char, _Traits, _Alloc>& __s2) const; |
257 | |
258 | // Global locale objects: |
259 | /** |
260 | * @brief Set global locale |
261 | * |
262 | * This function sets the global locale to the argument and returns a |
263 | * copy of the previous global locale. If the argument has a name, it |
264 | * will also call std::setlocale(LC_ALL, loc.name()). |
265 | * |
266 | * @param __loc The new locale to make global. |
267 | * @return Copy of the old global locale. |
268 | */ |
269 | static locale |
270 | global(const locale& __loc); |
271 | |
272 | /** |
273 | * @brief Return reference to the C locale. |
274 | */ |
275 | static const locale& |
276 | classic(); |
277 | |
278 | private: |
279 | // The (shared) implementation |
280 | _Impl* _M_impl; |
281 | |
282 | // The "C" reference locale |
283 | static _Impl* _S_classic; |
284 | |
285 | // Current global locale |
286 | static _Impl* _S_global; |
287 | |
288 | // Names of underlying locale categories. |
289 | // NB: locale::global() has to know how to modify all the |
290 | // underlying categories, not just the ones required by the C++ |
291 | // standard. |
292 | static const char* const* const _S_categories; |
293 | |
294 | // Number of standard categories. For C++, these categories are |
295 | // collate, ctype, monetary, numeric, time, and messages. These |
296 | // directly correspond to ISO C99 macros LC_COLLATE, LC_CTYPE, |
297 | // LC_MONETARY, LC_NUMERIC, and LC_TIME. In addition, POSIX (IEEE |
298 | // 1003.1-2001) specifies LC_MESSAGES. |
299 | // In addition to the standard categories, the underlying |
300 | // operating system is allowed to define extra LC_* |
301 | // macros. For GNU systems, the following are also valid: |
302 | // LC_PAPER, LC_NAME, LC_ADDRESS, LC_TELEPHONE, LC_MEASUREMENT, |
303 | // and LC_IDENTIFICATION. |
304 | enum { _S_categories_size = 6 + _GLIBCXX_NUM_CATEGORIES }; |
305 | |
306 | #ifdef __GTHREADS |
307 | static __gthread_once_t _S_once; |
308 | #endif |
309 | |
310 | explicit |
311 | locale(_Impl*) throw(); |
312 | |
313 | static void |
314 | _S_initialize(); |
315 | |
316 | static void |
317 | _S_initialize_once() throw(); |
318 | |
319 | static category |
320 | _S_normalize_category(category); |
321 | |
322 | void |
323 | _M_coalesce(const locale& __base, const locale& __add, category __cat); |
324 | }; |
325 | |
326 | |
327 | // 22.1.1.1.2 Class locale::facet |
328 | /** |
329 | * @brief Localization functionality base class. |
330 | * @ingroup locales |
331 | * |
332 | * The facet class is the base class for a localization feature, such as |
333 | * money, time, and number printing. It provides common support for facets |
334 | * and reference management. |
335 | * |
336 | * Facets may not be copied or assigned. |
337 | */ |
338 | class locale::facet |
339 | { |
340 | private: |
341 | friend class locale; |
342 | friend class locale::_Impl; |
343 | |
344 | mutable _Atomic_word _M_refcount; |
345 | |
346 | // Contains data from the underlying "C" library for the classic locale. |
347 | static __c_locale _S_c_locale; |
348 | |
349 | // String literal for the name of the classic locale. |
350 | static const char _S_c_name[2]; |
351 | |
352 | #ifdef __GTHREADS |
353 | static __gthread_once_t _S_once; |
354 | #endif |
355 | |
356 | static void |
357 | _S_initialize_once(); |
358 | |
359 | protected: |
360 | /** |
361 | * @brief Facet constructor. |
362 | * |
363 | * This is the constructor provided by the standard. If refs is 0, the |
364 | * facet is destroyed when the last referencing locale is destroyed. |
365 | * Otherwise the facet will never be destroyed. |
366 | * |
367 | * @param __refs The initial value for reference count. |
368 | */ |
369 | explicit |
370 | facet(size_t __refs = 0) throw() : _M_refcount(__refs ? 1 : 0) |
371 | { } |
372 | |
373 | /// Facet destructor. |
374 | virtual |
375 | ~facet(); |
376 | |
377 | static void |
378 | _S_create_c_locale(__c_locale& __cloc, const char* __s, |
379 | __c_locale __old = 0); |
380 | |
381 | static __c_locale |
382 | _S_clone_c_locale(__c_locale& __cloc) throw(); |
383 | |
384 | static void |
385 | _S_destroy_c_locale(__c_locale& __cloc); |
386 | |
387 | static __c_locale |
388 | _S_lc_ctype_c_locale(__c_locale __cloc, const char* __s); |
389 | |
390 | // Returns data from the underlying "C" library data for the |
391 | // classic locale. |
392 | static __c_locale |
393 | _S_get_c_locale(); |
394 | |
395 | _GLIBCXX_CONST static const char* |
396 | _S_get_c_name() throw(); |
397 | |
398 | private: |
399 | void |
400 | _M_add_reference() const throw() |
401 | { __gnu_cxx::__atomic_add_dispatch(&_M_refcount, 1); } |
402 | |
403 | void |
404 | _M_remove_reference() const throw() |
405 | { |
406 | // Be race-detector-friendly. For more info see bits/c++config. |
407 | _GLIBCXX_SYNCHRONIZATION_HAPPENS_BEFORE(&_M_refcount); |
408 | if (__gnu_cxx::__exchange_and_add_dispatch(&_M_refcount, -1) == 1) |
409 | { |
410 | _GLIBCXX_SYNCHRONIZATION_HAPPENS_AFTER(&_M_refcount); |
411 | __try |
412 | { delete this; } |
413 | __catch(...) |
414 | { } |
415 | } |
416 | } |
417 | |
418 | facet(const facet&); // Not defined. |
419 | |
420 | facet& |
421 | operator=(const facet&); // Not defined. |
422 | }; |
423 | |
424 | |
425 | // 22.1.1.1.3 Class locale::id |
426 | /** |
427 | * @brief Facet ID class. |
428 | * @ingroup locales |
429 | * |
430 | * The ID class provides facets with an index used to identify them. |
431 | * Every facet class must define a public static member locale::id, or be |
432 | * derived from a facet that provides this member, otherwise the facet |
433 | * cannot be used in a locale. The locale::id ensures that each class |
434 | * type gets a unique identifier. |
435 | */ |
436 | class locale::id |
437 | { |
438 | private: |
439 | friend class locale; |
440 | friend class locale::_Impl; |
441 | |
442 | template<typename _Facet> |
443 | friend const _Facet& |
444 | use_facet(const locale&); |
445 | |
446 | template<typename _Facet> |
447 | friend bool |
448 | has_facet(const locale&) throw(); |
449 | |
450 | // NB: There is no accessor for _M_index because it may be used |
451 | // before the constructor is run; the effect of calling a member |
452 | // function (even an inline) would be undefined. |
453 | mutable size_t _M_index; |
454 | |
455 | // Last id number assigned. |
456 | static _Atomic_word _S_refcount; |
457 | |
458 | void |
459 | operator=(const id&); // Not defined. |
460 | |
461 | id(const id&); // Not defined. |
462 | |
463 | public: |
464 | // NB: This class is always a static data member, and thus can be |
465 | // counted on to be zero-initialized. |
466 | /// Constructor. |
467 | id() { } |
468 | |
469 | size_t |
470 | _M_id() const throw(); |
471 | }; |
472 | |
473 | |
474 | // Implementation object for locale. |
475 | class locale::_Impl |
476 | { |
477 | public: |
478 | // Friends. |
479 | friend class locale; |
480 | friend class locale::facet; |
481 | |
482 | template<typename _Facet> |
483 | friend bool |
484 | has_facet(const locale&) throw(); |
485 | |
486 | template<typename _Facet> |
487 | friend const _Facet& |
488 | use_facet(const locale&); |
489 | |
490 | template<typename _Cache> |
491 | friend struct __use_cache; |
492 | |
493 | private: |
494 | // Data Members. |
495 | _Atomic_word _M_refcount; |
496 | const facet** _M_facets; |
497 | size_t _M_facets_size; |
498 | const facet** _M_caches; |
499 | char** _M_names; |
500 | static const locale::id* const _S_id_ctype[]; |
501 | static const locale::id* const _S_id_numeric[]; |
502 | static const locale::id* const _S_id_collate[]; |
503 | static const locale::id* const _S_id_time[]; |
504 | static const locale::id* const _S_id_monetary[]; |
505 | static const locale::id* const _S_id_messages[]; |
506 | static const locale::id* const* const _S_facet_categories[]; |
507 | |
508 | void |
509 | _M_add_reference() throw() |
510 | { __gnu_cxx::__atomic_add_dispatch(&_M_refcount, 1); } |
511 | |
512 | void |
513 | _M_remove_reference() throw() |
514 | { |
515 | // Be race-detector-friendly. For more info see bits/c++config. |
516 | _GLIBCXX_SYNCHRONIZATION_HAPPENS_BEFORE(&_M_refcount); |
517 | if (__gnu_cxx::__exchange_and_add_dispatch(&_M_refcount, -1) == 1) |
518 | { |
519 | _GLIBCXX_SYNCHRONIZATION_HAPPENS_AFTER(&_M_refcount); |
520 | __try |
521 | { delete this; } |
522 | __catch(...) |
523 | { } |
524 | } |
525 | } |
526 | |
527 | _Impl(const _Impl&, size_t); |
528 | _Impl(const char*, size_t); |
529 | _Impl(size_t) throw(); |
530 | |
531 | ~_Impl() throw(); |
532 | |
533 | _Impl(const _Impl&); // Not defined. |
534 | |
535 | void |
536 | operator=(const _Impl&); // Not defined. |
537 | |
538 | bool |
539 | _M_check_same_name() |
540 | { |
541 | bool __ret = true; |
542 | if (_M_names[1]) |
543 | // We must actually compare all the _M_names: can be all equal! |
544 | for (size_t __i = 0; __ret && __i < _S_categories_size - 1; ++__i) |
545 | __ret = __builtin_strcmp(_M_names[__i], _M_names[__i + 1]) == 0; |
546 | return __ret; |
547 | } |
548 | |
549 | void |
550 | _M_replace_categories(const _Impl*, category); |
551 | |
552 | void |
553 | _M_replace_category(const _Impl*, const locale::id* const*); |
554 | |
555 | void |
556 | _M_replace_facet(const _Impl*, const locale::id*); |
557 | |
558 | void |
559 | _M_install_facet(const locale::id*, const facet*); |
560 | |
561 | template<typename _Facet> |
562 | void |
563 | _M_init_facet(_Facet* __facet) |
564 | { _M_install_facet(&_Facet::id, __facet); } |
565 | |
566 | void |
567 | _M_install_cache(const facet*, size_t); |
568 | }; |
569 | |
570 | |
571 | /** |
572 | * @brief Facet for localized string comparison. |
573 | * |
574 | * This facet encapsulates the code to compare strings in a localized |
575 | * manner. |
576 | * |
577 | * The collate template uses protected virtual functions to provide |
578 | * the actual results. The public accessors forward the call to |
579 | * the virtual functions. These virtual functions are hooks for |
580 | * developers to implement the behavior they require from the |
581 | * collate facet. |
582 | */ |
583 | template<typename _CharT> |
584 | class collate : public locale::facet |
585 | { |
586 | public: |
587 | // Types: |
588 | //@{ |
589 | /// Public typedefs |
590 | typedef _CharT char_type; |
591 | typedef basic_string<_CharT> string_type; |
592 | //@} |
593 | |
594 | protected: |
595 | // Underlying "C" library locale information saved from |
596 | // initialization, needed by collate_byname as well. |
597 | __c_locale _M_c_locale_collate; |
598 | |
599 | public: |
600 | /// Numpunct facet id. |
601 | static locale::id id; |
602 | |
603 | /** |
604 | * @brief Constructor performs initialization. |
605 | * |
606 | * This is the constructor provided by the standard. |
607 | * |
608 | * @param __refs Passed to the base facet class. |
609 | */ |
610 | explicit |
611 | collate(size_t __refs = 0) |
612 | : facet(__refs), _M_c_locale_collate(_S_get_c_locale()) |
613 | { } |
614 | |
615 | /** |
616 | * @brief Internal constructor. Not for general use. |
617 | * |
618 | * This is a constructor for use by the library itself to set up new |
619 | * locales. |
620 | * |
621 | * @param __cloc The C locale. |
622 | * @param __refs Passed to the base facet class. |
623 | */ |
624 | explicit |
625 | collate(__c_locale __cloc, size_t __refs = 0) |
626 | : facet(__refs), _M_c_locale_collate(_S_clone_c_locale(__cloc)) |
627 | { } |
628 | |
629 | /** |
630 | * @brief Compare two strings. |
631 | * |
632 | * This function compares two strings and returns the result by calling |
633 | * collate::do_compare(). |
634 | * |
635 | * @param __lo1 Start of string 1. |
636 | * @param __hi1 End of string 1. |
637 | * @param __lo2 Start of string 2. |
638 | * @param __hi2 End of string 2. |
639 | * @return 1 if string1 > string2, -1 if string1 < string2, else 0. |
640 | */ |
641 | int |
642 | compare(const _CharT* __lo1, const _CharT* __hi1, |
643 | const _CharT* __lo2, const _CharT* __hi2) const |
644 | { return this->do_compare(__lo1, __hi1, __lo2, __hi2); } |
645 | |
646 | /** |
647 | * @brief Transform string to comparable form. |
648 | * |
649 | * This function is a wrapper for strxfrm functionality. It takes the |
650 | * input string and returns a modified string that can be directly |
651 | * compared to other transformed strings. In the C locale, this |
652 | * function just returns a copy of the input string. In some other |
653 | * locales, it may replace two chars with one, change a char for |
654 | * another, etc. It does so by returning collate::do_transform(). |
655 | * |
656 | * @param __lo Start of string. |
657 | * @param __hi End of string. |
658 | * @return Transformed string_type. |
659 | */ |
660 | string_type |
661 | transform(const _CharT* __lo, const _CharT* __hi) const |
662 | { return this->do_transform(__lo, __hi); } |
663 | |
664 | /** |
665 | * @brief Return hash of a string. |
666 | * |
667 | * This function computes and returns a hash on the input string. It |
668 | * does so by returning collate::do_hash(). |
669 | * |
670 | * @param __lo Start of string. |
671 | * @param __hi End of string. |
672 | * @return Hash value. |
673 | */ |
674 | long |
675 | hash(const _CharT* __lo, const _CharT* __hi) const |
676 | { return this->do_hash(__lo, __hi); } |
677 | |
678 | // Used to abstract out _CharT bits in virtual member functions, below. |
679 | int |
680 | _M_compare(const _CharT*, const _CharT*) const throw(); |
681 | |
682 | size_t |
683 | _M_transform(_CharT*, const _CharT*, size_t) const throw(); |
684 | |
685 | protected: |
686 | /// Destructor. |
687 | virtual |
688 | ~collate() |
689 | { _S_destroy_c_locale(_M_c_locale_collate); } |
690 | |
691 | /** |
692 | * @brief Compare two strings. |
693 | * |
694 | * This function is a hook for derived classes to change the value |
695 | * returned. @see compare(). |
696 | * |
697 | * @param __lo1 Start of string 1. |
698 | * @param __hi1 End of string 1. |
699 | * @param __lo2 Start of string 2. |
700 | * @param __hi2 End of string 2. |
701 | * @return 1 if string1 > string2, -1 if string1 < string2, else 0. |
702 | */ |
703 | virtual int |
704 | do_compare(const _CharT* __lo1, const _CharT* __hi1, |
705 | const _CharT* __lo2, const _CharT* __hi2) const; |
706 | |
707 | /** |
708 | * @brief Transform string to comparable form. |
709 | * |
710 | * This function is a hook for derived classes to change the value |
711 | * returned. |
712 | * |
713 | * @param __lo Start. |
714 | * @param __hi End. |
715 | * @return transformed string. |
716 | */ |
717 | virtual string_type |
718 | do_transform(const _CharT* __lo, const _CharT* __hi) const; |
719 | |
720 | /** |
721 | * @brief Return hash of a string. |
722 | * |
723 | * This function computes and returns a hash on the input string. This |
724 | * function is a hook for derived classes to change the value returned. |
725 | * |
726 | * @param __lo Start of string. |
727 | * @param __hi End of string. |
728 | * @return Hash value. |
729 | */ |
730 | virtual long |
731 | do_hash(const _CharT* __lo, const _CharT* __hi) const; |
732 | }; |
733 | |
734 | template<typename _CharT> |
735 | locale::id collate<_CharT>::id; |
736 | |
737 | // Specializations. |
738 | template<> |
739 | int |
740 | collate<char>::_M_compare(const char*, const char*) const throw(); |
741 | |
742 | template<> |
743 | size_t |
744 | collate<char>::_M_transform(char*, const char*, size_t) const throw(); |
745 | |
746 | #ifdef _GLIBCXX_USE_WCHAR_T |
747 | template<> |
748 | int |
749 | collate<wchar_t>::_M_compare(const wchar_t*, const wchar_t*) const throw(); |
750 | |
751 | template<> |
752 | size_t |
753 | collate<wchar_t>::_M_transform(wchar_t*, const wchar_t*, size_t) const throw(); |
754 | #endif |
755 | |
756 | /// class collate_byname [22.2.4.2]. |
757 | template<typename _CharT> |
758 | class collate_byname : public collate<_CharT> |
759 | { |
760 | public: |
761 | //@{ |
762 | /// Public typedefs |
763 | typedef _CharT char_type; |
764 | typedef basic_string<_CharT> string_type; |
765 | //@} |
766 | |
767 | explicit |
768 | collate_byname(const char* __s, size_t __refs = 0) |
769 | : collate<_CharT>(__refs) |
770 | { |
771 | if (__builtin_strcmp(__s, "C" ) != 0 |
772 | && __builtin_strcmp(__s, "POSIX" ) != 0) |
773 | { |
774 | this->_S_destroy_c_locale(this->_M_c_locale_collate); |
775 | this->_S_create_c_locale(this->_M_c_locale_collate, __s); |
776 | } |
777 | } |
778 | |
779 | protected: |
780 | virtual |
781 | ~collate_byname() { } |
782 | }; |
783 | |
784 | _GLIBCXX_END_NAMESPACE_VERSION |
785 | } // namespace |
786 | |
787 | # include <bits/locale_classes.tcc> |
788 | |
789 | #endif |
790 | |