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1 : // Locale support -*- C++ -*-
2 :
3 : // Copyright (C) 1997-2019 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 : /**
258 : * @brief Locale inequality.
259 : *
260 : * @param __other The locale to compare against.
261 : * @return ! (*this == __other)
262 : */
263 : bool
264 : operator!=(const locale& __other) const throw()
265 : { return !(this->operator==(__other)); }
266 :
267 : /**
268 : * @brief Compare two strings according to collate.
269 : *
270 : * Template operator to compare two strings using the compare function of
271 : * the collate facet in this locale. One use is to provide the locale to
272 : * the sort function. For example, a vector v of strings could be sorted
273 : * according to locale loc by doing:
274 : * @code
275 : * std::sort(v.begin(), v.end(), loc);
276 : * @endcode
277 : *
278 : * @param __s1 First string to compare.
279 : * @param __s2 Second string to compare.
280 : * @return True if collate<_Char> facet compares __s1 < __s2, else false.
281 : */
282 : template<typename _Char, typename _Traits, typename _Alloc>
283 : bool
284 : operator()(const basic_string<_Char, _Traits, _Alloc>& __s1,
285 : const basic_string<_Char, _Traits, _Alloc>& __s2) const;
286 :
287 : // Global locale objects:
288 : /**
289 : * @brief Set global locale
290 : *
291 : * This function sets the global locale to the argument and returns a
292 : * copy of the previous global locale. If the argument has a name, it
293 : * will also call std::setlocale(LC_ALL, loc.name()).
294 : *
295 : * @param __loc The new locale to make global.
296 : * @return Copy of the old global locale.
297 : */
298 : static locale
299 : global(const locale& __loc);
300 :
301 : /**
302 : * @brief Return reference to the C locale.
303 : */
304 : static const locale&
305 : classic();
306 :
307 : private:
308 : // The (shared) implementation
309 : _Impl* _M_impl;
310 :
311 : // The "C" reference locale
312 : static _Impl* _S_classic;
313 :
314 : // Current global locale
315 : static _Impl* _S_global;
316 :
317 : // Names of underlying locale categories.
318 : // NB: locale::global() has to know how to modify all the
319 : // underlying categories, not just the ones required by the C++
320 : // standard.
321 : static const char* const* const _S_categories;
322 :
323 : // Number of standard categories. For C++, these categories are
324 : // collate, ctype, monetary, numeric, time, and messages. These
325 : // directly correspond to ISO C99 macros LC_COLLATE, LC_CTYPE,
326 : // LC_MONETARY, LC_NUMERIC, and LC_TIME. In addition, POSIX (IEEE
327 : // 1003.1-2001) specifies LC_MESSAGES.
328 : // In addition to the standard categories, the underlying
329 : // operating system is allowed to define extra LC_*
330 : // macros. For GNU systems, the following are also valid:
331 : // LC_PAPER, LC_NAME, LC_ADDRESS, LC_TELEPHONE, LC_MEASUREMENT,
332 : // and LC_IDENTIFICATION.
333 : enum { _S_categories_size = 6 + _GLIBCXX_NUM_CATEGORIES };
334 :
335 : #ifdef __GTHREADS
336 : static __gthread_once_t _S_once;
337 : #endif
338 :
339 : explicit
340 : locale(_Impl*) throw();
341 :
342 : static void
343 : _S_initialize();
344 :
345 : static void
346 : _S_initialize_once() throw();
347 :
348 : static category
349 : _S_normalize_category(category);
350 :
351 : void
352 : _M_coalesce(const locale& __base, const locale& __add, category __cat);
353 :
354 : #if _GLIBCXX_USE_CXX11_ABI
355 : static const id* const _S_twinned_facets[];
356 : #endif
357 : };
358 :
359 :
360 : // 22.1.1.1.2 Class locale::facet
361 : /**
362 : * @brief Localization functionality base class.
363 : * @ingroup locales
364 : *
365 : * The facet class is the base class for a localization feature, such as
366 : * money, time, and number printing. It provides common support for facets
367 : * and reference management.
368 : *
369 : * Facets may not be copied or assigned.
370 : */
371 : class locale::facet
372 : {
373 : private:
374 : friend class locale;
375 : friend class locale::_Impl;
376 :
377 : mutable _Atomic_word _M_refcount;
378 :
379 : // Contains data from the underlying "C" library for the classic locale.
380 : static __c_locale _S_c_locale;
381 :
382 : // String literal for the name of the classic locale.
383 : static const char _S_c_name[2];
384 :
385 : #ifdef __GTHREADS
386 : static __gthread_once_t _S_once;
387 : #endif
388 :
389 : static void
390 : _S_initialize_once();
391 :
392 : protected:
393 : /**
394 : * @brief Facet constructor.
395 : *
396 : * This is the constructor provided by the standard. If refs is 0, the
397 : * facet is destroyed when the last referencing locale is destroyed.
398 : * Otherwise the facet will never be destroyed.
399 : *
400 : * @param __refs The initial value for reference count.
401 : */
402 : explicit
403 0 : facet(size_t __refs = 0) throw() : _M_refcount(__refs ? 1 : 0)
404 : { }
405 :
406 : /// Facet destructor.
407 : virtual
408 : ~facet();
409 :
410 : static void
411 : _S_create_c_locale(__c_locale& __cloc, const char* __s,
412 : __c_locale __old = 0);
413 :
414 : static __c_locale
415 : _S_clone_c_locale(__c_locale& __cloc) throw();
416 :
417 : static void
418 : _S_destroy_c_locale(__c_locale& __cloc);
419 :
420 : static __c_locale
421 : _S_lc_ctype_c_locale(__c_locale __cloc, const char* __s);
422 :
423 : // Returns data from the underlying "C" library data for the
424 : // classic locale.
425 : static __c_locale
426 : _S_get_c_locale();
427 :
428 : _GLIBCXX_CONST static const char*
429 : _S_get_c_name() throw();
430 :
431 : #if __cplusplus < 201103L
432 : private:
433 : facet(const facet&); // Not defined.
434 :
435 : facet&
436 : operator=(const facet&); // Not defined.
437 : #else
438 : facet(const facet&) = delete;
439 :
440 : facet&
441 : operator=(const facet&) = delete;
442 : #endif
443 :
444 : private:
445 : void
446 : _M_add_reference() const throw()
447 : { __gnu_cxx::__atomic_add_dispatch(&_M_refcount, 1); }
448 :
449 : void
450 : _M_remove_reference() const throw()
451 : {
452 : // Be race-detector-friendly. For more info see bits/c++config.
453 : _GLIBCXX_SYNCHRONIZATION_HAPPENS_BEFORE(&_M_refcount);
454 : if (__gnu_cxx::__exchange_and_add_dispatch(&_M_refcount, -1) == 1)
455 : {
456 : _GLIBCXX_SYNCHRONIZATION_HAPPENS_AFTER(&_M_refcount);
457 : __try
458 : { delete this; }
459 : __catch(...)
460 : { }
461 : }
462 : }
463 :
464 : const facet* _M_sso_shim(const id*) const;
465 : const facet* _M_cow_shim(const id*) const;
466 :
467 : protected:
468 : class __shim; // For internal use only.
469 : };
470 :
471 :
472 : // 22.1.1.1.3 Class locale::id
473 : /**
474 : * @brief Facet ID class.
475 : * @ingroup locales
476 : *
477 : * The ID class provides facets with an index used to identify them.
478 : * Every facet class must define a public static member locale::id, or be
479 : * derived from a facet that provides this member, otherwise the facet
480 : * cannot be used in a locale. The locale::id ensures that each class
481 : * type gets a unique identifier.
482 : */
483 : class locale::id
484 : {
485 : private:
486 : friend class locale;
487 : friend class locale::_Impl;
488 :
489 : template<typename _Facet>
490 : friend const _Facet&
491 : use_facet(const locale&);
492 :
493 : template<typename _Facet>
494 : friend bool
495 : has_facet(const locale&) throw();
496 :
497 : // NB: There is no accessor for _M_index because it may be used
498 : // before the constructor is run; the effect of calling a member
499 : // function (even an inline) would be undefined.
500 : mutable size_t _M_index;
501 :
502 : // Last id number assigned.
503 : static _Atomic_word _S_refcount;
504 :
505 : void
506 : operator=(const id&); // Not defined.
507 :
508 : id(const id&); // Not defined.
509 :
510 : public:
511 : // NB: This class is always a static data member, and thus can be
512 : // counted on to be zero-initialized.
513 : /// Constructor.
514 : id() { }
515 :
516 : size_t
517 : _M_id() const throw();
518 : };
519 :
520 :
521 : // Implementation object for locale.
522 : class locale::_Impl
523 : {
524 : public:
525 : // Friends.
526 : friend class locale;
527 : friend class locale::facet;
528 :
529 : template<typename _Facet>
530 : friend bool
531 : has_facet(const locale&) throw();
532 :
533 : template<typename _Facet>
534 : friend const _Facet&
535 : use_facet(const locale&);
536 :
537 : template<typename _Cache>
538 : friend struct __use_cache;
539 :
540 : private:
541 : // Data Members.
542 : _Atomic_word _M_refcount;
543 : const facet** _M_facets;
544 : size_t _M_facets_size;
545 : const facet** _M_caches;
546 : char** _M_names;
547 : static const locale::id* const _S_id_ctype[];
548 : static const locale::id* const _S_id_numeric[];
549 : static const locale::id* const _S_id_collate[];
550 : static const locale::id* const _S_id_time[];
551 : static const locale::id* const _S_id_monetary[];
552 : static const locale::id* const _S_id_messages[];
553 : static const locale::id* const* const _S_facet_categories[];
554 :
555 : void
556 : _M_add_reference() throw()
557 : { __gnu_cxx::__atomic_add_dispatch(&_M_refcount, 1); }
558 :
559 : void
560 0 : _M_remove_reference() throw()
561 : {
562 : // Be race-detector-friendly. For more info see bits/c++config.
563 0 : _GLIBCXX_SYNCHRONIZATION_HAPPENS_BEFORE(&_M_refcount);
564 0 : if (__gnu_cxx::__exchange_and_add_dispatch(&_M_refcount, -1) == 1)
565 : {
566 0 : _GLIBCXX_SYNCHRONIZATION_HAPPENS_AFTER(&_M_refcount);
567 0 : __try
568 0 : { delete this; }
569 : __catch(...)
570 : { }
571 : }
572 0 : }
573 :
574 : _Impl(const _Impl&, size_t);
575 : _Impl(const char*, size_t);
576 : _Impl(size_t) throw();
577 :
578 : ~_Impl() throw();
579 :
580 : _Impl(const _Impl&); // Not defined.
581 :
582 : void
583 : operator=(const _Impl&); // Not defined.
584 :
585 : bool
586 : _M_check_same_name()
587 : {
588 : bool __ret = true;
589 : if (_M_names[1])
590 : // We must actually compare all the _M_names: can be all equal!
591 : for (size_t __i = 0; __ret && __i < _S_categories_size - 1; ++__i)
592 : __ret = __builtin_strcmp(_M_names[__i], _M_names[__i + 1]) == 0;
593 : return __ret;
594 : }
595 :
596 : void
597 : _M_replace_categories(const _Impl*, category);
598 :
599 : void
600 : _M_replace_category(const _Impl*, const locale::id* const*);
601 :
602 : void
603 : _M_replace_facet(const _Impl*, const locale::id*);
604 :
605 : void
606 : _M_install_facet(const locale::id*, const facet*);
607 :
608 : template<typename _Facet>
609 : void
610 : _M_init_facet(_Facet* __facet)
611 : { _M_install_facet(&_Facet::id, __facet); }
612 :
613 : template<typename _Facet>
614 : void
615 : _M_init_facet_unchecked(_Facet* __facet)
616 : {
617 : __facet->_M_add_reference();
618 : _M_facets[_Facet::id._M_id()] = __facet;
619 : }
620 :
621 : void
622 : _M_install_cache(const facet*, size_t);
623 :
624 : void _M_init_extra(facet**);
625 : void _M_init_extra(void*, void*, const char*, const char*);
626 : };
627 :
628 :
629 : /**
630 : * @brief Facet for localized string comparison.
631 : *
632 : * This facet encapsulates the code to compare strings in a localized
633 : * manner.
634 : *
635 : * The collate template uses protected virtual functions to provide
636 : * the actual results. The public accessors forward the call to
637 : * the virtual functions. These virtual functions are hooks for
638 : * developers to implement the behavior they require from the
639 : * collate facet.
640 : */
641 : template<typename _CharT>
642 : class _GLIBCXX_NAMESPACE_CXX11 collate : public locale::facet
643 : {
644 : public:
645 : // Types:
646 : ///@{
647 : /// Public typedefs
648 : typedef _CharT char_type;
649 : typedef basic_string<_CharT> string_type;
650 : ///@}
651 :
652 : protected:
653 : // Underlying "C" library locale information saved from
654 : // initialization, needed by collate_byname as well.
655 : __c_locale _M_c_locale_collate;
656 :
657 : public:
658 : /// Numpunct facet id.
659 : static locale::id id;
660 :
661 : /**
662 : * @brief Constructor performs initialization.
663 : *
664 : * This is the constructor provided by the standard.
665 : *
666 : * @param __refs Passed to the base facet class.
667 : */
668 : explicit
669 : collate(size_t __refs = 0)
670 : : facet(__refs), _M_c_locale_collate(_S_get_c_locale())
671 : { }
672 :
673 : /**
674 : * @brief Internal constructor. Not for general use.
675 : *
676 : * This is a constructor for use by the library itself to set up new
677 : * locales.
678 : *
679 : * @param __cloc The C locale.
680 : * @param __refs Passed to the base facet class.
681 : */
682 : explicit
683 : collate(__c_locale __cloc, size_t __refs = 0)
684 : : facet(__refs), _M_c_locale_collate(_S_clone_c_locale(__cloc))
685 : { }
686 :
687 : /**
688 : * @brief Compare two strings.
689 : *
690 : * This function compares two strings and returns the result by calling
691 : * collate::do_compare().
692 : *
693 : * @param __lo1 Start of string 1.
694 : * @param __hi1 End of string 1.
695 : * @param __lo2 Start of string 2.
696 : * @param __hi2 End of string 2.
697 : * @return 1 if string1 > string2, -1 if string1 < string2, else 0.
698 : */
699 : int
700 : compare(const _CharT* __lo1, const _CharT* __hi1,
701 : const _CharT* __lo2, const _CharT* __hi2) const
702 : { return this->do_compare(__lo1, __hi1, __lo2, __hi2); }
703 :
704 : /**
705 : * @brief Transform string to comparable form.
706 : *
707 : * This function is a wrapper for strxfrm functionality. It takes the
708 : * input string and returns a modified string that can be directly
709 : * compared to other transformed strings. In the C locale, this
710 : * function just returns a copy of the input string. In some other
711 : * locales, it may replace two chars with one, change a char for
712 : * another, etc. It does so by returning collate::do_transform().
713 : *
714 : * @param __lo Start of string.
715 : * @param __hi End of string.
716 : * @return Transformed string_type.
717 : */
718 : string_type
719 1212850 : transform(const _CharT* __lo, const _CharT* __hi) const
720 1212850 : { return this->do_transform(__lo, __hi); }
721 :
722 : /**
723 : * @brief Return hash of a string.
724 : *
725 : * This function computes and returns a hash on the input string. It
726 : * does so by returning collate::do_hash().
727 : *
728 : * @param __lo Start of string.
729 : * @param __hi End of string.
730 : * @return Hash value.
731 : */
732 : long
733 : hash(const _CharT* __lo, const _CharT* __hi) const
734 : { return this->do_hash(__lo, __hi); }
735 :
736 : // Used to abstract out _CharT bits in virtual member functions, below.
737 : int
738 : _M_compare(const _CharT*, const _CharT*) const throw();
739 :
740 : size_t
741 : _M_transform(_CharT*, const _CharT*, size_t) const throw();
742 :
743 : protected:
744 : /// Destructor.
745 : virtual
746 : ~collate()
747 : { _S_destroy_c_locale(_M_c_locale_collate); }
748 :
749 : /**
750 : * @brief Compare two strings.
751 : *
752 : * This function is a hook for derived classes to change the value
753 : * returned. @see compare().
754 : *
755 : * @param __lo1 Start of string 1.
756 : * @param __hi1 End of string 1.
757 : * @param __lo2 Start of string 2.
758 : * @param __hi2 End of string 2.
759 : * @return 1 if string1 > string2, -1 if string1 < string2, else 0.
760 : */
761 : virtual int
762 : do_compare(const _CharT* __lo1, const _CharT* __hi1,
763 : const _CharT* __lo2, const _CharT* __hi2) const;
764 :
765 : /**
766 : * @brief Transform string to comparable form.
767 : *
768 : * This function is a hook for derived classes to change the value
769 : * returned.
770 : *
771 : * @param __lo Start.
772 : * @param __hi End.
773 : * @return transformed string.
774 : */
775 : virtual string_type
776 : do_transform(const _CharT* __lo, const _CharT* __hi) const;
777 :
778 : /**
779 : * @brief Return hash of a string.
780 : *
781 : * This function computes and returns a hash on the input string. This
782 : * function is a hook for derived classes to change the value returned.
783 : *
784 : * @param __lo Start of string.
785 : * @param __hi End of string.
786 : * @return Hash value.
787 : */
788 : virtual long
789 : do_hash(const _CharT* __lo, const _CharT* __hi) const;
790 : };
791 :
792 : template<typename _CharT>
793 : locale::id collate<_CharT>::id;
794 :
795 : // Specializations.
796 : template<>
797 : int
798 : collate<char>::_M_compare(const char*, const char*) const throw();
799 :
800 : template<>
801 : size_t
802 : collate<char>::_M_transform(char*, const char*, size_t) const throw();
803 :
804 : #ifdef _GLIBCXX_USE_WCHAR_T
805 : template<>
806 : int
807 : collate<wchar_t>::_M_compare(const wchar_t*, const wchar_t*) const throw();
808 :
809 : template<>
810 : size_t
811 : collate<wchar_t>::_M_transform(wchar_t*, const wchar_t*, size_t) const throw();
812 : #endif
813 :
814 : /// class collate_byname [22.2.4.2].
815 : template<typename _CharT>
816 : class _GLIBCXX_NAMESPACE_CXX11 collate_byname : public collate<_CharT>
817 : {
818 : public:
819 : ///@{
820 : /// Public typedefs
821 : typedef _CharT char_type;
822 : typedef basic_string<_CharT> string_type;
823 : ///@}
824 :
825 : explicit
826 : collate_byname(const char* __s, size_t __refs = 0)
827 : : collate<_CharT>(__refs)
828 : {
829 : if (__builtin_strcmp(__s, "C") != 0
830 : && __builtin_strcmp(__s, "POSIX") != 0)
831 : {
832 : this->_S_destroy_c_locale(this->_M_c_locale_collate);
833 : this->_S_create_c_locale(this->_M_c_locale_collate, __s);
834 : }
835 : }
836 :
837 : #if __cplusplus >= 201103L
838 : explicit
839 : collate_byname(const string& __s, size_t __refs = 0)
840 : : collate_byname(__s.c_str(), __refs) { }
841 : #endif
842 :
843 : protected:
844 : virtual
845 : ~collate_byname() { }
846 : };
847 :
848 : _GLIBCXX_END_NAMESPACE_VERSION
849 : } // namespace
850 :
851 : # include <bits/locale_classes.tcc>
852 :
853 : #endif
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