1 | // Locale support -*- C++ -*- |
2 | |
3 | // Copyright (C) 1997-2021 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 | #if __cplusplus >= 201103L |
154 | /** |
155 | * @brief Named locale constructor. |
156 | * |
157 | * Constructs a copy of the named C library locale. |
158 | * |
159 | * @param __s Name of the locale to construct. |
160 | * @throw std::runtime_error if __s is an undefined locale. |
161 | */ |
162 | explicit |
163 | locale(const std::string& __s) : locale(__s.c_str()) { } |
164 | |
165 | /** |
166 | * @brief Construct locale with facets from another locale. |
167 | * |
168 | * Constructs a copy of the locale @a base. The facets specified by @a |
169 | * cat are replaced with those from the locale named by @a s. If base is |
170 | * named, this locale instance will also be named. |
171 | * |
172 | * @param __base The locale to copy. |
173 | * @param __s Name of the locale to use facets from. |
174 | * @param __cat Set of categories defining the facets to use from __s. |
175 | * @throw std::runtime_error if __s is an undefined locale. |
176 | */ |
177 | locale(const locale& __base, const std::string& __s, category __cat) |
178 | : locale(__base, __s.c_str(), __cat) { } |
179 | #endif |
180 | |
181 | /** |
182 | * @brief Construct locale with facets from another locale. |
183 | * |
184 | * Constructs a copy of the locale @a base. The facets specified by @a |
185 | * cat are replaced with those from the locale @a add. If @a base and @a |
186 | * add are named, this locale instance will also be named. |
187 | * |
188 | * @param __base The locale to copy. |
189 | * @param __add The locale to use facets from. |
190 | * @param __cat Set of categories defining the facets to use from add. |
191 | */ |
192 | locale(const locale& __base, const locale& __add, category __cat); |
193 | |
194 | /** |
195 | * @brief Construct locale with another facet. |
196 | * |
197 | * Constructs a copy of the locale @a __other. The facet @a __f |
198 | * is added to @a __other, replacing an existing facet of type |
199 | * Facet if there is one. If @a __f is null, this locale is a |
200 | * copy of @a __other. |
201 | * |
202 | * @param __other The locale to copy. |
203 | * @param __f The facet to add in. |
204 | */ |
205 | template<typename _Facet> |
206 | locale(const locale& __other, _Facet* __f); |
207 | |
208 | /// Locale destructor. |
209 | ~locale() throw(); |
210 | |
211 | /** |
212 | * @brief Assignment operator. |
213 | * |
214 | * Set this locale to be a copy of @a other. |
215 | * |
216 | * @param __other The locale to copy. |
217 | * @return A reference to this locale. |
218 | */ |
219 | const locale& |
220 | operator=(const locale& __other) throw(); |
221 | |
222 | /** |
223 | * @brief Construct locale with another facet. |
224 | * |
225 | * Constructs and returns a new copy of this locale. Adds or replaces an |
226 | * existing facet of type Facet from the locale @a other into the new |
227 | * locale. |
228 | * |
229 | * @tparam _Facet The facet type to copy from other |
230 | * @param __other The locale to copy from. |
231 | * @return Newly constructed locale. |
232 | * @throw std::runtime_error if __other has no facet of type _Facet. |
233 | */ |
234 | template<typename _Facet> |
235 | locale |
236 | combine(const locale& __other) const; |
237 | |
238 | // Locale operations: |
239 | /** |
240 | * @brief Return locale name. |
241 | * @return Locale name or "*" if unnamed. |
242 | */ |
243 | _GLIBCXX_DEFAULT_ABI_TAG |
244 | string |
245 | name() const; |
246 | |
247 | /** |
248 | * @brief Locale equality. |
249 | * |
250 | * @param __other The locale to compare against. |
251 | * @return True if other and this refer to the same locale instance, are |
252 | * copies, or have the same name. False otherwise. |
253 | */ |
254 | bool |
255 | operator==(const locale& __other) const throw(); |
256 | |
257 | #if __cpp_impl_three_way_comparison < 201907L |
258 | /** |
259 | * @brief Locale inequality. |
260 | * |
261 | * @param __other The locale to compare against. |
262 | * @return ! (*this == __other) |
263 | */ |
264 | bool |
265 | operator!=(const locale& __other) const throw() |
266 | { return !(this->operator==(__other)); } |
267 | #endif |
268 | |
269 | /** |
270 | * @brief Compare two strings according to collate. |
271 | * |
272 | * Template operator to compare two strings using the compare function of |
273 | * the collate facet in this locale. One use is to provide the locale to |
274 | * the sort function. For example, a vector v of strings could be sorted |
275 | * according to locale loc by doing: |
276 | * @code |
277 | * std::sort(v.begin(), v.end(), loc); |
278 | * @endcode |
279 | * |
280 | * @param __s1 First string to compare. |
281 | * @param __s2 Second string to compare. |
282 | * @return True if collate<_Char> facet compares __s1 < __s2, else false. |
283 | */ |
284 | template<typename _Char, typename _Traits, typename _Alloc> |
285 | bool |
286 | operator()(const basic_string<_Char, _Traits, _Alloc>& __s1, |
287 | const basic_string<_Char, _Traits, _Alloc>& __s2) const; |
288 | |
289 | // Global locale objects: |
290 | /** |
291 | * @brief Set global locale |
292 | * |
293 | * This function sets the global locale to the argument and returns a |
294 | * copy of the previous global locale. If the argument has a name, it |
295 | * will also call std::setlocale(LC_ALL, loc.name()). |
296 | * |
297 | * @param __loc The new locale to make global. |
298 | * @return Copy of the old global locale. |
299 | */ |
300 | static locale |
301 | global(const locale& __loc); |
302 | |
303 | /** |
304 | * @brief Return reference to the C locale. |
305 | */ |
306 | static const locale& |
307 | classic(); |
308 | |
309 | private: |
310 | // The (shared) implementation |
311 | _Impl* _M_impl; |
312 | |
313 | // The "C" reference locale |
314 | static _Impl* _S_classic; |
315 | |
316 | // Current global locale |
317 | static _Impl* _S_global; |
318 | |
319 | // Names of underlying locale categories. |
320 | // NB: locale::global() has to know how to modify all the |
321 | // underlying categories, not just the ones required by the C++ |
322 | // standard. |
323 | static const char* const* const _S_categories; |
324 | |
325 | // Number of standard categories. For C++, these categories are |
326 | // collate, ctype, monetary, numeric, time, and messages. These |
327 | // directly correspond to ISO C99 macros LC_COLLATE, LC_CTYPE, |
328 | // LC_MONETARY, LC_NUMERIC, and LC_TIME. In addition, POSIX (IEEE |
329 | // 1003.1-2001) specifies LC_MESSAGES. |
330 | // In addition to the standard categories, the underlying |
331 | // operating system is allowed to define extra LC_* |
332 | // macros. For GNU systems, the following are also valid: |
333 | // LC_PAPER, LC_NAME, LC_ADDRESS, LC_TELEPHONE, LC_MEASUREMENT, |
334 | // and LC_IDENTIFICATION. |
335 | enum { _S_categories_size = 6 + _GLIBCXX_NUM_CATEGORIES }; |
336 | |
337 | #ifdef __GTHREADS |
338 | static __gthread_once_t _S_once; |
339 | #endif |
340 | |
341 | explicit |
342 | locale(_Impl*) throw(); |
343 | |
344 | static void |
345 | _S_initialize(); |
346 | |
347 | static void |
348 | _S_initialize_once() throw(); |
349 | |
350 | static category |
351 | _S_normalize_category(category); |
352 | |
353 | void |
354 | _M_coalesce(const locale& __base, const locale& __add, category __cat); |
355 | |
356 | #if _GLIBCXX_USE_CXX11_ABI |
357 | static const id* const _S_twinned_facets[]; |
358 | #endif |
359 | }; |
360 | |
361 | |
362 | // 22.1.1.1.2 Class locale::facet |
363 | /** |
364 | * @brief Localization functionality base class. |
365 | * @ingroup locales |
366 | * |
367 | * The facet class is the base class for a localization feature, such as |
368 | * money, time, and number printing. It provides common support for facets |
369 | * and reference management. |
370 | * |
371 | * Facets may not be copied or assigned. |
372 | */ |
373 | class locale::facet |
374 | { |
375 | private: |
376 | friend class locale; |
377 | friend class locale::_Impl; |
378 | |
379 | mutable _Atomic_word _M_refcount; |
380 | |
381 | // Contains data from the underlying "C" library for the classic locale. |
382 | static __c_locale _S_c_locale; |
383 | |
384 | // String literal for the name of the classic locale. |
385 | static const char _S_c_name[2]; |
386 | |
387 | #ifdef __GTHREADS |
388 | static __gthread_once_t _S_once; |
389 | #endif |
390 | |
391 | static void |
392 | _S_initialize_once(); |
393 | |
394 | protected: |
395 | /** |
396 | * @brief Facet constructor. |
397 | * |
398 | * This is the constructor provided by the standard. If refs is 0, the |
399 | * facet is destroyed when the last referencing locale is destroyed. |
400 | * Otherwise the facet will never be destroyed. |
401 | * |
402 | * @param __refs The initial value for reference count. |
403 | */ |
404 | explicit |
405 | facet(size_t __refs = 0) throw() : _M_refcount(__refs ? 1 : 0) |
406 | { } |
407 | |
408 | /// Facet destructor. |
409 | virtual |
410 | ~facet(); |
411 | |
412 | static void |
413 | _S_create_c_locale(__c_locale& __cloc, const char* __s, |
414 | __c_locale __old = 0); |
415 | |
416 | static __c_locale |
417 | _S_clone_c_locale(__c_locale& __cloc) throw(); |
418 | |
419 | static void |
420 | _S_destroy_c_locale(__c_locale& __cloc); |
421 | |
422 | static __c_locale |
423 | _S_lc_ctype_c_locale(__c_locale __cloc, const char* __s); |
424 | |
425 | // Returns data from the underlying "C" library data for the |
426 | // classic locale. |
427 | static __c_locale |
428 | _S_get_c_locale(); |
429 | |
430 | _GLIBCXX_CONST static const char* |
431 | _S_get_c_name() throw(); |
432 | |
433 | #if __cplusplus < 201103L |
434 | private: |
435 | facet(const facet&); // Not defined. |
436 | |
437 | facet& |
438 | operator=(const facet&); // Not defined. |
439 | #else |
440 | facet(const facet&) = delete; |
441 | |
442 | facet& |
443 | operator=(const facet&) = delete; |
444 | #endif |
445 | |
446 | private: |
447 | void |
448 | _M_add_reference() const throw() |
449 | { __gnu_cxx::__atomic_add_dispatch(mem: &_M_refcount, val: 1); } |
450 | |
451 | void |
452 | _M_remove_reference() const throw() |
453 | { |
454 | // Be race-detector-friendly. For more info see bits/c++config. |
455 | _GLIBCXX_SYNCHRONIZATION_HAPPENS_BEFORE(&_M_refcount); |
456 | if (__gnu_cxx::__exchange_and_add_dispatch(mem: &_M_refcount, val: -1) == 1) |
457 | { |
458 | _GLIBCXX_SYNCHRONIZATION_HAPPENS_AFTER(&_M_refcount); |
459 | __try |
460 | { delete this; } |
461 | __catch(...) |
462 | { } |
463 | } |
464 | } |
465 | |
466 | const facet* _M_sso_shim(const id*) const; |
467 | const facet* _M_cow_shim(const id*) const; |
468 | |
469 | protected: |
470 | class __shim; // For internal use only. |
471 | }; |
472 | |
473 | |
474 | // 22.1.1.1.3 Class locale::id |
475 | /** |
476 | * @brief Facet ID class. |
477 | * @ingroup locales |
478 | * |
479 | * The ID class provides facets with an index used to identify them. |
480 | * Every facet class must define a public static member locale::id, or be |
481 | * derived from a facet that provides this member, otherwise the facet |
482 | * cannot be used in a locale. The locale::id ensures that each class |
483 | * type gets a unique identifier. |
484 | */ |
485 | class locale::id |
486 | { |
487 | private: |
488 | friend class locale; |
489 | friend class locale::_Impl; |
490 | |
491 | template<typename _Facet> |
492 | friend const _Facet& |
493 | use_facet(const locale&); |
494 | |
495 | template<typename _Facet> |
496 | friend bool |
497 | has_facet(const locale&) throw(); |
498 | |
499 | // NB: There is no accessor for _M_index because it may be used |
500 | // before the constructor is run; the effect of calling a member |
501 | // function (even an inline) would be undefined. |
502 | mutable size_t _M_index; |
503 | |
504 | // Last id number assigned. |
505 | static _Atomic_word _S_refcount; |
506 | |
507 | void |
508 | operator=(const id&); // Not defined. |
509 | |
510 | id(const id&); // Not defined. |
511 | |
512 | public: |
513 | // NB: This class is always a static data member, and thus can be |
514 | // counted on to be zero-initialized. |
515 | /// Constructor. |
516 | id() { } |
517 | |
518 | size_t |
519 | _M_id() const throw(); |
520 | }; |
521 | |
522 | |
523 | // Implementation object for locale. |
524 | class locale::_Impl |
525 | { |
526 | public: |
527 | // Friends. |
528 | friend class locale; |
529 | friend class locale::facet; |
530 | |
531 | template<typename _Facet> |
532 | friend bool |
533 | has_facet(const locale&) throw(); |
534 | |
535 | template<typename _Facet> |
536 | friend const _Facet& |
537 | use_facet(const locale&); |
538 | |
539 | template<typename _Cache> |
540 | friend struct __use_cache; |
541 | |
542 | private: |
543 | // Data Members. |
544 | _Atomic_word _M_refcount; |
545 | const facet** _M_facets; |
546 | size_t _M_facets_size; |
547 | const facet** _M_caches; |
548 | char** _M_names; |
549 | static const locale::id* const _S_id_ctype[]; |
550 | static const locale::id* const _S_id_numeric[]; |
551 | static const locale::id* const _S_id_collate[]; |
552 | static const locale::id* const _S_id_time[]; |
553 | static const locale::id* const _S_id_monetary[]; |
554 | static const locale::id* const _S_id_messages[]; |
555 | static const locale::id* const* const _S_facet_categories[]; |
556 | |
557 | void |
558 | _M_add_reference() throw() |
559 | { __gnu_cxx::__atomic_add_dispatch(mem: &_M_refcount, val: 1); } |
560 | |
561 | void |
562 | _M_remove_reference() throw() |
563 | { |
564 | // Be race-detector-friendly. For more info see bits/c++config. |
565 | _GLIBCXX_SYNCHRONIZATION_HAPPENS_BEFORE(&_M_refcount); |
566 | if (__gnu_cxx::__exchange_and_add_dispatch(mem: &_M_refcount, val: -1) == 1) |
567 | { |
568 | _GLIBCXX_SYNCHRONIZATION_HAPPENS_AFTER(&_M_refcount); |
569 | __try |
570 | { delete this; } |
571 | __catch(...) |
572 | { } |
573 | } |
574 | } |
575 | |
576 | _Impl(const _Impl&, size_t); |
577 | _Impl(const char*, size_t); |
578 | _Impl(size_t) throw(); |
579 | |
580 | ~_Impl() throw(); |
581 | |
582 | _Impl(const _Impl&); // Not defined. |
583 | |
584 | void |
585 | operator=(const _Impl&); // Not defined. |
586 | |
587 | bool |
588 | _M_check_same_name() |
589 | { |
590 | bool __ret = true; |
591 | if (_M_names[1]) |
592 | // We must actually compare all the _M_names: can be all equal! |
593 | for (size_t __i = 0; __ret && __i < _S_categories_size - 1; ++__i) |
594 | __ret = __builtin_strcmp(_M_names[__i], _M_names[__i + 1]) == 0; |
595 | return __ret; |
596 | } |
597 | |
598 | void |
599 | _M_replace_categories(const _Impl*, category); |
600 | |
601 | void |
602 | _M_replace_category(const _Impl*, const locale::id* const*); |
603 | |
604 | void |
605 | _M_replace_facet(const _Impl*, const locale::id*); |
606 | |
607 | void |
608 | _M_install_facet(const locale::id*, const facet*); |
609 | |
610 | template<typename _Facet> |
611 | void |
612 | _M_init_facet(_Facet* __facet) |
613 | { _M_install_facet(&_Facet::id, __facet); } |
614 | |
615 | template<typename _Facet> |
616 | void |
617 | _M_init_facet_unchecked(_Facet* __facet) |
618 | { |
619 | __facet->_M_add_reference(); |
620 | _M_facets[_Facet::id._M_id()] = __facet; |
621 | } |
622 | |
623 | void |
624 | _M_install_cache(const facet*, size_t); |
625 | |
626 | void (facet**); |
627 | void (void*, void*, const char*, const char*); |
628 | |
629 | #ifdef _GLIBCXX_LONG_DOUBLE_ALT128_COMPAT |
630 | void _M_init_extra_ldbl128(bool); |
631 | #endif |
632 | }; |
633 | |
634 | |
635 | /** |
636 | * @brief Facet for localized string comparison. |
637 | * |
638 | * This facet encapsulates the code to compare strings in a localized |
639 | * manner. |
640 | * |
641 | * The collate template uses protected virtual functions to provide |
642 | * the actual results. The public accessors forward the call to |
643 | * the virtual functions. These virtual functions are hooks for |
644 | * developers to implement the behavior they require from the |
645 | * collate facet. |
646 | */ |
647 | template<typename _CharT> |
648 | class _GLIBCXX_NAMESPACE_CXX11 collate : public locale::facet |
649 | { |
650 | public: |
651 | // Types: |
652 | ///@{ |
653 | /// Public typedefs |
654 | typedef _CharT char_type; |
655 | typedef basic_string<_CharT> string_type; |
656 | ///@} |
657 | |
658 | protected: |
659 | // Underlying "C" library locale information saved from |
660 | // initialization, needed by collate_byname as well. |
661 | __c_locale _M_c_locale_collate; |
662 | |
663 | public: |
664 | /// Numpunct facet id. |
665 | static locale::id id; |
666 | |
667 | /** |
668 | * @brief Constructor performs initialization. |
669 | * |
670 | * This is the constructor provided by the standard. |
671 | * |
672 | * @param __refs Passed to the base facet class. |
673 | */ |
674 | explicit |
675 | collate(size_t __refs = 0) |
676 | : facet(__refs), _M_c_locale_collate(_S_get_c_locale()) |
677 | { } |
678 | |
679 | /** |
680 | * @brief Internal constructor. Not for general use. |
681 | * |
682 | * This is a constructor for use by the library itself to set up new |
683 | * locales. |
684 | * |
685 | * @param __cloc The C locale. |
686 | * @param __refs Passed to the base facet class. |
687 | */ |
688 | explicit |
689 | collate(__c_locale __cloc, size_t __refs = 0) |
690 | : facet(__refs), _M_c_locale_collate(_S_clone_c_locale(__cloc)) |
691 | { } |
692 | |
693 | /** |
694 | * @brief Compare two strings. |
695 | * |
696 | * This function compares two strings and returns the result by calling |
697 | * collate::do_compare(). |
698 | * |
699 | * @param __lo1 Start of string 1. |
700 | * @param __hi1 End of string 1. |
701 | * @param __lo2 Start of string 2. |
702 | * @param __hi2 End of string 2. |
703 | * @return 1 if string1 > string2, -1 if string1 < string2, else 0. |
704 | */ |
705 | int |
706 | compare(const _CharT* __lo1, const _CharT* __hi1, |
707 | const _CharT* __lo2, const _CharT* __hi2) const |
708 | { return this->do_compare(__lo1, __hi1, __lo2, __hi2); } |
709 | |
710 | /** |
711 | * @brief Transform string to comparable form. |
712 | * |
713 | * This function is a wrapper for strxfrm functionality. It takes the |
714 | * input string and returns a modified string that can be directly |
715 | * compared to other transformed strings. In the C locale, this |
716 | * function just returns a copy of the input string. In some other |
717 | * locales, it may replace two chars with one, change a char for |
718 | * another, etc. It does so by returning collate::do_transform(). |
719 | * |
720 | * @param __lo Start of string. |
721 | * @param __hi End of string. |
722 | * @return Transformed string_type. |
723 | */ |
724 | string_type |
725 | transform(const _CharT* __lo, const _CharT* __hi) const |
726 | { return this->do_transform(__lo, __hi); } |
727 | |
728 | /** |
729 | * @brief Return hash of a string. |
730 | * |
731 | * This function computes and returns a hash on the input string. It |
732 | * does so by returning collate::do_hash(). |
733 | * |
734 | * @param __lo Start of string. |
735 | * @param __hi End of string. |
736 | * @return Hash value. |
737 | */ |
738 | long |
739 | hash(const _CharT* __lo, const _CharT* __hi) const |
740 | { return this->do_hash(__lo, __hi); } |
741 | |
742 | // Used to abstract out _CharT bits in virtual member functions, below. |
743 | int |
744 | _M_compare(const _CharT*, const _CharT*) const throw(); |
745 | |
746 | size_t |
747 | _M_transform(_CharT*, const _CharT*, size_t) const throw(); |
748 | |
749 | protected: |
750 | /// Destructor. |
751 | virtual |
752 | ~collate() |
753 | { _S_destroy_c_locale(cloc&: _M_c_locale_collate); } |
754 | |
755 | /** |
756 | * @brief Compare two strings. |
757 | * |
758 | * This function is a hook for derived classes to change the value |
759 | * returned. @see compare(). |
760 | * |
761 | * @param __lo1 Start of string 1. |
762 | * @param __hi1 End of string 1. |
763 | * @param __lo2 Start of string 2. |
764 | * @param __hi2 End of string 2. |
765 | * @return 1 if string1 > string2, -1 if string1 < string2, else 0. |
766 | */ |
767 | virtual int |
768 | do_compare(const _CharT* __lo1, const _CharT* __hi1, |
769 | const _CharT* __lo2, const _CharT* __hi2) const; |
770 | |
771 | /** |
772 | * @brief Transform string to comparable form. |
773 | * |
774 | * This function is a hook for derived classes to change the value |
775 | * returned. |
776 | * |
777 | * @param __lo Start. |
778 | * @param __hi End. |
779 | * @return transformed string. |
780 | */ |
781 | virtual string_type |
782 | do_transform(const _CharT* __lo, const _CharT* __hi) const; |
783 | |
784 | /** |
785 | * @brief Return hash of a string. |
786 | * |
787 | * This function computes and returns a hash on the input string. This |
788 | * function is a hook for derived classes to change the value returned. |
789 | * |
790 | * @param __lo Start of string. |
791 | * @param __hi End of string. |
792 | * @return Hash value. |
793 | */ |
794 | virtual long |
795 | do_hash(const _CharT* __lo, const _CharT* __hi) const; |
796 | }; |
797 | |
798 | template<typename _CharT> |
799 | locale::id collate<_CharT>::id; |
800 | |
801 | // Specializations. |
802 | template<> |
803 | int |
804 | collate<char>::_M_compare(const char*, const char*) const throw(); |
805 | |
806 | template<> |
807 | size_t |
808 | collate<char>::_M_transform(char*, const char*, size_t) const throw(); |
809 | |
810 | #ifdef _GLIBCXX_USE_WCHAR_T |
811 | template<> |
812 | int |
813 | collate<wchar_t>::_M_compare(const wchar_t*, const wchar_t*) const throw(); |
814 | |
815 | template<> |
816 | size_t |
817 | collate<wchar_t>::_M_transform(wchar_t*, const wchar_t*, size_t) const throw(); |
818 | #endif |
819 | |
820 | /// class collate_byname [22.2.4.2]. |
821 | template<typename _CharT> |
822 | class _GLIBCXX_NAMESPACE_CXX11 collate_byname : public collate<_CharT> |
823 | { |
824 | public: |
825 | ///@{ |
826 | /// Public typedefs |
827 | typedef _CharT char_type; |
828 | typedef basic_string<_CharT> string_type; |
829 | ///@} |
830 | |
831 | explicit |
832 | collate_byname(const char* __s, size_t __refs = 0) |
833 | : collate<_CharT>(__refs) |
834 | { |
835 | if (__builtin_strcmp(__s, "C" ) != 0 |
836 | && __builtin_strcmp(__s, "POSIX" ) != 0) |
837 | { |
838 | this->_S_destroy_c_locale(this->_M_c_locale_collate); |
839 | this->_S_create_c_locale(this->_M_c_locale_collate, __s); |
840 | } |
841 | } |
842 | |
843 | #if __cplusplus >= 201103L |
844 | explicit |
845 | collate_byname(const string& __s, size_t __refs = 0) |
846 | : collate_byname(__s.c_str(), __refs) { } |
847 | #endif |
848 | |
849 | protected: |
850 | virtual |
851 | ~collate_byname() { } |
852 | }; |
853 | |
854 | _GLIBCXX_END_NAMESPACE_VERSION |
855 | } // namespace |
856 | |
857 | # include <bits/locale_classes.tcc> |
858 | |
859 | #endif |
860 | |