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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 0 : operator!=(const locale& __other) const throw()
266 0 : { 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 0 : facet(size_t __refs = 0) throw() : _M_refcount(__refs ? 1 : 0)
406 0 : { }
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(&_M_refcount, 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(&_M_refcount, -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 1 : 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(&_M_refcount, 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(&_M_refcount, -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 _M_init_extra(facet**);
627 : void _M_init_extra(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(_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
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