libstdc++
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00001 // Locale support -*- C++ -*- 00002 00003 // Copyright (C) 1997-2015 Free Software Foundation, Inc. 00004 // 00005 // This file is part of the GNU ISO C++ Library. This library is free 00006 // software; you can redistribute it and/or modify it under the 00007 // terms of the GNU General Public License as published by the 00008 // Free Software Foundation; either version 3, or (at your option) 00009 // any later version. 00010 00011 // This library is distributed in the hope that it will be useful, 00012 // but WITHOUT ANY WARRANTY; without even the implied warranty of 00013 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00014 // GNU General Public License for more details. 00015 00016 // Under Section 7 of GPL version 3, you are granted additional 00017 // permissions described in the GCC Runtime Library Exception, version 00018 // 3.1, as published by the Free Software Foundation. 00019 00020 // You should have received a copy of the GNU General Public License and 00021 // a copy of the GCC Runtime Library Exception along with this program; 00022 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 00023 // <http://www.gnu.org/licenses/>. 00024 00025 /** @file bits/locale_classes.h 00026 * This is an internal header file, included by other library headers. 00027 * Do not attempt to use it directly. @headername{locale} 00028 */ 00029 00030 // 00031 // ISO C++ 14882: 22.1 Locales 00032 // 00033 00034 #ifndef _LOCALE_CLASSES_H 00035 #define _LOCALE_CLASSES_H 1 00036 00037 #pragma GCC system_header 00038 00039 #include <bits/localefwd.h> 00040 #include <string> 00041 #include <ext/atomicity.h> 00042 00043 namespace std _GLIBCXX_VISIBILITY(default) 00044 { 00045 _GLIBCXX_BEGIN_NAMESPACE_VERSION 00046 00047 // 22.1.1 Class locale 00048 /** 00049 * @brief Container class for localization functionality. 00050 * @ingroup locales 00051 * 00052 * The locale class is first a class wrapper for C library locales. It is 00053 * also an extensible container for user-defined localization. A locale is 00054 * a collection of facets that implement various localization features such 00055 * as money, time, and number printing. 00056 * 00057 * Constructing C++ locales does not change the C library locale. 00058 * 00059 * This library supports efficient construction and copying of locales 00060 * through a reference counting implementation of the locale class. 00061 */ 00062 class locale 00063 { 00064 public: 00065 // Types: 00066 /// Definition of locale::category. 00067 typedef int category; 00068 00069 // Forward decls and friends: 00070 class facet; 00071 class id; 00072 class _Impl; 00073 00074 friend class facet; 00075 friend class _Impl; 00076 00077 template<typename _Facet> 00078 friend bool 00079 has_facet(const locale&) throw(); 00080 00081 template<typename _Facet> 00082 friend const _Facet& 00083 use_facet(const locale&); 00084 00085 template<typename _Cache> 00086 friend struct __use_cache; 00087 00088 //@{ 00089 /** 00090 * @brief Category values. 00091 * 00092 * The standard category values are none, ctype, numeric, collate, time, 00093 * monetary, and messages. They form a bitmask that supports union and 00094 * intersection. The category all is the union of these values. 00095 * 00096 * NB: Order must match _S_facet_categories definition in locale.cc 00097 */ 00098 static const category none = 0; 00099 static const category ctype = 1L << 0; 00100 static const category numeric = 1L << 1; 00101 static const category collate = 1L << 2; 00102 static const category time = 1L << 3; 00103 static const category monetary = 1L << 4; 00104 static const category messages = 1L << 5; 00105 static const category all = (ctype | numeric | collate | 00106 time | monetary | messages); 00107 //@} 00108 00109 // Construct/copy/destroy: 00110 00111 /** 00112 * @brief Default constructor. 00113 * 00114 * Constructs a copy of the global locale. If no locale has been 00115 * explicitly set, this is the C locale. 00116 */ 00117 locale() throw(); 00118 00119 /** 00120 * @brief Copy constructor. 00121 * 00122 * Constructs a copy of @a other. 00123 * 00124 * @param __other The locale to copy. 00125 */ 00126 locale(const locale& __other) throw(); 00127 00128 /** 00129 * @brief Named locale constructor. 00130 * 00131 * Constructs a copy of the named C library locale. 00132 * 00133 * @param __s Name of the locale to construct. 00134 * @throw std::runtime_error if __s is null or an undefined locale. 00135 */ 00136 explicit 00137 locale(const char* __s); 00138 00139 /** 00140 * @brief Construct locale with facets from another locale. 00141 * 00142 * Constructs a copy of the locale @a base. The facets specified by @a 00143 * cat are replaced with those from the locale named by @a s. If base is 00144 * named, this locale instance will also be named. 00145 * 00146 * @param __base The locale to copy. 00147 * @param __s Name of the locale to use facets from. 00148 * @param __cat Set of categories defining the facets to use from __s. 00149 * @throw std::runtime_error if __s is null or an undefined locale. 00150 */ 00151 locale(const locale& __base, const char* __s, category __cat); 00152 00153 #if __cplusplus >= 201103L 00154 /** 00155 * @brief Named locale constructor. 00156 * 00157 * Constructs a copy of the named C library locale. 00158 * 00159 * @param __s Name of the locale to construct. 00160 * @throw std::runtime_error if __s is an undefined locale. 00161 */ 00162 explicit 00163 locale(const std::string& __s) : locale(__s.c_str()) { } 00164 00165 /** 00166 * @brief Construct locale with facets from another locale. 00167 * 00168 * Constructs a copy of the locale @a base. The facets specified by @a 00169 * cat are replaced with those from the locale named by @a s. If base is 00170 * named, this locale instance will also be named. 00171 * 00172 * @param __base The locale to copy. 00173 * @param __s Name of the locale to use facets from. 00174 * @param __cat Set of categories defining the facets to use from __s. 00175 * @throw std::runtime_error if __s is an undefined locale. 00176 */ 00177 locale(const locale& __base, const std::string& __s, category __cat) 00178 : locale(__base, __s.c_str(), __cat) { } 00179 #endif 00180 00181 /** 00182 * @brief Construct locale with facets from another locale. 00183 * 00184 * Constructs a copy of the locale @a base. The facets specified by @a 00185 * cat are replaced with those from the locale @a add. If @a base and @a 00186 * add are named, this locale instance will also be named. 00187 * 00188 * @param __base The locale to copy. 00189 * @param __add The locale to use facets from. 00190 * @param __cat Set of categories defining the facets to use from add. 00191 */ 00192 locale(const locale& __base, const locale& __add, category __cat); 00193 00194 /** 00195 * @brief Construct locale with another facet. 00196 * 00197 * Constructs a copy of the locale @a __other. The facet @a __f 00198 * is added to @a __other, replacing an existing facet of type 00199 * Facet if there is one. If @a __f is null, this locale is a 00200 * copy of @a __other. 00201 * 00202 * @param __other The locale to copy. 00203 * @param __f The facet to add in. 00204 */ 00205 template<typename _Facet> 00206 locale(const locale& __other, _Facet* __f); 00207 00208 /// Locale destructor. 00209 ~locale() throw(); 00210 00211 /** 00212 * @brief Assignment operator. 00213 * 00214 * Set this locale to be a copy of @a other. 00215 * 00216 * @param __other The locale to copy. 00217 * @return A reference to this locale. 00218 */ 00219 const locale& 00220 operator=(const locale& __other) throw(); 00221 00222 /** 00223 * @brief Construct locale with another facet. 00224 * 00225 * Constructs and returns a new copy of this locale. Adds or replaces an 00226 * existing facet of type Facet from the locale @a other into the new 00227 * locale. 00228 * 00229 * @tparam _Facet The facet type to copy from other 00230 * @param __other The locale to copy from. 00231 * @return Newly constructed locale. 00232 * @throw std::runtime_error if __other has no facet of type _Facet. 00233 */ 00234 template<typename _Facet> 00235 locale 00236 combine(const locale& __other) const; 00237 00238 // Locale operations: 00239 /** 00240 * @brief Return locale name. 00241 * @return Locale name or "*" if unnamed. 00242 */ 00243 _GLIBCXX_DEFAULT_ABI_TAG 00244 string 00245 name() const; 00246 00247 /** 00248 * @brief Locale equality. 00249 * 00250 * @param __other The locale to compare against. 00251 * @return True if other and this refer to the same locale instance, are 00252 * copies, or have the same name. False otherwise. 00253 */ 00254 bool 00255 operator==(const locale& __other) const throw(); 00256 00257 /** 00258 * @brief Locale inequality. 00259 * 00260 * @param __other The locale to compare against. 00261 * @return ! (*this == __other) 00262 */ 00263 bool 00264 operator!=(const locale& __other) const throw() 00265 { return !(this->operator==(__other)); } 00266 00267 /** 00268 * @brief Compare two strings according to collate. 00269 * 00270 * Template operator to compare two strings using the compare function of 00271 * the collate facet in this locale. One use is to provide the locale to 00272 * the sort function. For example, a vector v of strings could be sorted 00273 * according to locale loc by doing: 00274 * @code 00275 * std::sort(v.begin(), v.end(), loc); 00276 * @endcode 00277 * 00278 * @param __s1 First string to compare. 00279 * @param __s2 Second string to compare. 00280 * @return True if collate<_Char> facet compares __s1 < __s2, else false. 00281 */ 00282 template<typename _Char, typename _Traits, typename _Alloc> 00283 bool 00284 operator()(const basic_string<_Char, _Traits, _Alloc>& __s1, 00285 const basic_string<_Char, _Traits, _Alloc>& __s2) const; 00286 00287 // Global locale objects: 00288 /** 00289 * @brief Set global locale 00290 * 00291 * This function sets the global locale to the argument and returns a 00292 * copy of the previous global locale. If the argument has a name, it 00293 * will also call std::setlocale(LC_ALL, loc.name()). 00294 * 00295 * @param __loc The new locale to make global. 00296 * @return Copy of the old global locale. 00297 */ 00298 static locale 00299 global(const locale& __loc); 00300 00301 /** 00302 * @brief Return reference to the C locale. 00303 */ 00304 static const locale& 00305 classic(); 00306 00307 private: 00308 // The (shared) implementation 00309 _Impl* _M_impl; 00310 00311 // The "C" reference locale 00312 static _Impl* _S_classic; 00313 00314 // Current global locale 00315 static _Impl* _S_global; 00316 00317 // Names of underlying locale categories. 00318 // NB: locale::global() has to know how to modify all the 00319 // underlying categories, not just the ones required by the C++ 00320 // standard. 00321 static const char* const* const _S_categories; 00322 00323 // Number of standard categories. For C++, these categories are 00324 // collate, ctype, monetary, numeric, time, and messages. These 00325 // directly correspond to ISO C99 macros LC_COLLATE, LC_CTYPE, 00326 // LC_MONETARY, LC_NUMERIC, and LC_TIME. In addition, POSIX (IEEE 00327 // 1003.1-2001) specifies LC_MESSAGES. 00328 // In addition to the standard categories, the underlying 00329 // operating system is allowed to define extra LC_* 00330 // macros. For GNU systems, the following are also valid: 00331 // LC_PAPER, LC_NAME, LC_ADDRESS, LC_TELEPHONE, LC_MEASUREMENT, 00332 // and LC_IDENTIFICATION. 00333 enum { _S_categories_size = 6 + _GLIBCXX_NUM_CATEGORIES }; 00334 00335 #ifdef __GTHREADS 00336 static __gthread_once_t _S_once; 00337 #endif 00338 00339 explicit 00340 locale(_Impl*) throw(); 00341 00342 static void 00343 _S_initialize(); 00344 00345 static void 00346 _S_initialize_once() throw(); 00347 00348 static category 00349 _S_normalize_category(category); 00350 00351 void 00352 _M_coalesce(const locale& __base, const locale& __add, category __cat); 00353 00354 #if _GLIBCXX_USE_CXX11_ABI 00355 static const id* const _S_twinned_facets[]; 00356 #endif 00357 }; 00358 00359 00360 // 22.1.1.1.2 Class locale::facet 00361 /** 00362 * @brief Localization functionality base class. 00363 * @ingroup locales 00364 * 00365 * The facet class is the base class for a localization feature, such as 00366 * money, time, and number printing. It provides common support for facets 00367 * and reference management. 00368 * 00369 * Facets may not be copied or assigned. 00370 */ 00371 class locale::facet 00372 { 00373 private: 00374 friend class locale; 00375 friend class locale::_Impl; 00376 00377 mutable _Atomic_word _M_refcount; 00378 00379 // Contains data from the underlying "C" library for the classic locale. 00380 static __c_locale _S_c_locale; 00381 00382 // String literal for the name of the classic locale. 00383 static const char _S_c_name[2]; 00384 00385 #ifdef __GTHREADS 00386 static __gthread_once_t _S_once; 00387 #endif 00388 00389 static void 00390 _S_initialize_once(); 00391 00392 protected: 00393 /** 00394 * @brief Facet constructor. 00395 * 00396 * This is the constructor provided by the standard. If refs is 0, the 00397 * facet is destroyed when the last referencing locale is destroyed. 00398 * Otherwise the facet will never be destroyed. 00399 * 00400 * @param __refs The initial value for reference count. 00401 */ 00402 explicit 00403 facet(size_t __refs = 0) throw() : _M_refcount(__refs ? 1 : 0) 00404 { } 00405 00406 /// Facet destructor. 00407 virtual 00408 ~facet(); 00409 00410 static void 00411 _S_create_c_locale(__c_locale& __cloc, const char* __s, 00412 __c_locale __old = 0); 00413 00414 static __c_locale 00415 _S_clone_c_locale(__c_locale& __cloc) throw(); 00416 00417 static void 00418 _S_destroy_c_locale(__c_locale& __cloc); 00419 00420 static __c_locale 00421 _S_lc_ctype_c_locale(__c_locale __cloc, const char* __s); 00422 00423 // Returns data from the underlying "C" library data for the 00424 // classic locale. 00425 static __c_locale 00426 _S_get_c_locale(); 00427 00428 _GLIBCXX_CONST static const char* 00429 _S_get_c_name() throw(); 00430 00431 private: 00432 void 00433 _M_add_reference() const throw() 00434 { __gnu_cxx::__atomic_add_dispatch(&_M_refcount, 1); } 00435 00436 void 00437 _M_remove_reference() const throw() 00438 { 00439 // Be race-detector-friendly. For more info see bits/c++config. 00440 _GLIBCXX_SYNCHRONIZATION_HAPPENS_BEFORE(&_M_refcount); 00441 if (__gnu_cxx::__exchange_and_add_dispatch(&_M_refcount, -1) == 1) 00442 { 00443 _GLIBCXX_SYNCHRONIZATION_HAPPENS_AFTER(&_M_refcount); 00444 __try 00445 { delete this; } 00446 __catch(...) 00447 { } 00448 } 00449 } 00450 00451 facet(const facet&); // Not defined. 00452 00453 facet& 00454 operator=(const facet&); // Not defined. 00455 00456 class __shim; 00457 00458 const facet* _M_sso_shim(const id*) const; 00459 const facet* _M_cow_shim(const id*) const; 00460 }; 00461 00462 00463 // 22.1.1.1.3 Class locale::id 00464 /** 00465 * @brief Facet ID class. 00466 * @ingroup locales 00467 * 00468 * The ID class provides facets with an index used to identify them. 00469 * Every facet class must define a public static member locale::id, or be 00470 * derived from a facet that provides this member, otherwise the facet 00471 * cannot be used in a locale. The locale::id ensures that each class 00472 * type gets a unique identifier. 00473 */ 00474 class locale::id 00475 { 00476 private: 00477 friend class locale; 00478 friend class locale::_Impl; 00479 00480 template<typename _Facet> 00481 friend const _Facet& 00482 use_facet(const locale&); 00483 00484 template<typename _Facet> 00485 friend bool 00486 has_facet(const locale&) throw(); 00487 00488 // NB: There is no accessor for _M_index because it may be used 00489 // before the constructor is run; the effect of calling a member 00490 // function (even an inline) would be undefined. 00491 mutable size_t _M_index; 00492 00493 // Last id number assigned. 00494 static _Atomic_word _S_refcount; 00495 00496 void 00497 operator=(const id&); // Not defined. 00498 00499 id(const id&); // Not defined. 00500 00501 public: 00502 // NB: This class is always a static data member, and thus can be 00503 // counted on to be zero-initialized. 00504 /// Constructor. 00505 id() { } 00506 00507 size_t 00508 _M_id() const throw(); 00509 }; 00510 00511 00512 // Implementation object for locale. 00513 class locale::_Impl 00514 { 00515 public: 00516 // Friends. 00517 friend class locale; 00518 friend class locale::facet; 00519 00520 template<typename _Facet> 00521 friend bool 00522 has_facet(const locale&) throw(); 00523 00524 template<typename _Facet> 00525 friend const _Facet& 00526 use_facet(const locale&); 00527 00528 template<typename _Cache> 00529 friend struct __use_cache; 00530 00531 private: 00532 // Data Members. 00533 _Atomic_word _M_refcount; 00534 const facet** _M_facets; 00535 size_t _M_facets_size; 00536 const facet** _M_caches; 00537 char** _M_names; 00538 static const locale::id* const _S_id_ctype[]; 00539 static const locale::id* const _S_id_numeric[]; 00540 static const locale::id* const _S_id_collate[]; 00541 static const locale::id* const _S_id_time[]; 00542 static const locale::id* const _S_id_monetary[]; 00543 static const locale::id* const _S_id_messages[]; 00544 static const locale::id* const* const _S_facet_categories[]; 00545 00546 void 00547 _M_add_reference() throw() 00548 { __gnu_cxx::__atomic_add_dispatch(&_M_refcount, 1); } 00549 00550 void 00551 _M_remove_reference() throw() 00552 { 00553 // Be race-detector-friendly. For more info see bits/c++config. 00554 _GLIBCXX_SYNCHRONIZATION_HAPPENS_BEFORE(&_M_refcount); 00555 if (__gnu_cxx::__exchange_and_add_dispatch(&_M_refcount, -1) == 1) 00556 { 00557 _GLIBCXX_SYNCHRONIZATION_HAPPENS_AFTER(&_M_refcount); 00558 __try 00559 { delete this; } 00560 __catch(...) 00561 { } 00562 } 00563 } 00564 00565 _Impl(const _Impl&, size_t); 00566 _Impl(const char*, size_t); 00567 _Impl(size_t) throw(); 00568 00569 ~_Impl() throw(); 00570 00571 _Impl(const _Impl&); // Not defined. 00572 00573 void 00574 operator=(const _Impl&); // Not defined. 00575 00576 bool 00577 _M_check_same_name() 00578 { 00579 bool __ret = true; 00580 if (_M_names[1]) 00581 // We must actually compare all the _M_names: can be all equal! 00582 for (size_t __i = 0; __ret && __i < _S_categories_size - 1; ++__i) 00583 __ret = __builtin_strcmp(_M_names[__i], _M_names[__i + 1]) == 0; 00584 return __ret; 00585 } 00586 00587 void 00588 _M_replace_categories(const _Impl*, category); 00589 00590 void 00591 _M_replace_category(const _Impl*, const locale::id* const*); 00592 00593 void 00594 _M_replace_facet(const _Impl*, const locale::id*); 00595 00596 void 00597 _M_install_facet(const locale::id*, const facet*); 00598 00599 template<typename _Facet> 00600 void 00601 _M_init_facet(_Facet* __facet) 00602 { _M_install_facet(&_Facet::id, __facet); } 00603 00604 template<typename _Facet> 00605 void 00606 _M_init_facet_unchecked(_Facet* __facet) 00607 { 00608 __facet->_M_add_reference(); 00609 _M_facets[_Facet::id._M_id()] = __facet; 00610 } 00611 00612 void 00613 _M_install_cache(const facet*, size_t); 00614 00615 void _M_init_extra(facet**); 00616 void _M_init_extra(void*, void*, const char*, const char*); 00617 }; 00618 00619 00620 /** 00621 * @brief Facet for localized string comparison. 00622 * 00623 * This facet encapsulates the code to compare strings in a localized 00624 * manner. 00625 * 00626 * The collate template uses protected virtual functions to provide 00627 * the actual results. The public accessors forward the call to 00628 * the virtual functions. These virtual functions are hooks for 00629 * developers to implement the behavior they require from the 00630 * collate facet. 00631 */ 00632 template<typename _CharT> 00633 class _GLIBCXX_NAMESPACE_CXX11 collate : public locale::facet 00634 { 00635 public: 00636 // Types: 00637 //@{ 00638 /// Public typedefs 00639 typedef _CharT char_type; 00640 typedef basic_string<_CharT> string_type; 00641 //@} 00642 00643 protected: 00644 // Underlying "C" library locale information saved from 00645 // initialization, needed by collate_byname as well. 00646 __c_locale _M_c_locale_collate; 00647 00648 public: 00649 /// Numpunct facet id. 00650 static locale::id id; 00651 00652 /** 00653 * @brief Constructor performs initialization. 00654 * 00655 * This is the constructor provided by the standard. 00656 * 00657 * @param __refs Passed to the base facet class. 00658 */ 00659 explicit 00660 collate(size_t __refs = 0) 00661 : facet(__refs), _M_c_locale_collate(_S_get_c_locale()) 00662 { } 00663 00664 /** 00665 * @brief Internal constructor. Not for general use. 00666 * 00667 * This is a constructor for use by the library itself to set up new 00668 * locales. 00669 * 00670 * @param __cloc The C locale. 00671 * @param __refs Passed to the base facet class. 00672 */ 00673 explicit 00674 collate(__c_locale __cloc, size_t __refs = 0) 00675 : facet(__refs), _M_c_locale_collate(_S_clone_c_locale(__cloc)) 00676 { } 00677 00678 /** 00679 * @brief Compare two strings. 00680 * 00681 * This function compares two strings and returns the result by calling 00682 * collate::do_compare(). 00683 * 00684 * @param __lo1 Start of string 1. 00685 * @param __hi1 End of string 1. 00686 * @param __lo2 Start of string 2. 00687 * @param __hi2 End of string 2. 00688 * @return 1 if string1 > string2, -1 if string1 < string2, else 0. 00689 */ 00690 int 00691 compare(const _CharT* __lo1, const _CharT* __hi1, 00692 const _CharT* __lo2, const _CharT* __hi2) const 00693 { return this->do_compare(__lo1, __hi1, __lo2, __hi2); } 00694 00695 /** 00696 * @brief Transform string to comparable form. 00697 * 00698 * This function is a wrapper for strxfrm functionality. It takes the 00699 * input string and returns a modified string that can be directly 00700 * compared to other transformed strings. In the C locale, this 00701 * function just returns a copy of the input string. In some other 00702 * locales, it may replace two chars with one, change a char for 00703 * another, etc. It does so by returning collate::do_transform(). 00704 * 00705 * @param __lo Start of string. 00706 * @param __hi End of string. 00707 * @return Transformed string_type. 00708 */ 00709 string_type 00710 transform(const _CharT* __lo, const _CharT* __hi) const 00711 { return this->do_transform(__lo, __hi); } 00712 00713 /** 00714 * @brief Return hash of a string. 00715 * 00716 * This function computes and returns a hash on the input string. It 00717 * does so by returning collate::do_hash(). 00718 * 00719 * @param __lo Start of string. 00720 * @param __hi End of string. 00721 * @return Hash value. 00722 */ 00723 long 00724 hash(const _CharT* __lo, const _CharT* __hi) const 00725 { return this->do_hash(__lo, __hi); } 00726 00727 // Used to abstract out _CharT bits in virtual member functions, below. 00728 int 00729 _M_compare(const _CharT*, const _CharT*) const throw(); 00730 00731 size_t 00732 _M_transform(_CharT*, const _CharT*, size_t) const throw(); 00733 00734 protected: 00735 /// Destructor. 00736 virtual 00737 ~collate() 00738 { _S_destroy_c_locale(_M_c_locale_collate); } 00739 00740 /** 00741 * @brief Compare two strings. 00742 * 00743 * This function is a hook for derived classes to change the value 00744 * returned. @see compare(). 00745 * 00746 * @param __lo1 Start of string 1. 00747 * @param __hi1 End of string 1. 00748 * @param __lo2 Start of string 2. 00749 * @param __hi2 End of string 2. 00750 * @return 1 if string1 > string2, -1 if string1 < string2, else 0. 00751 */ 00752 virtual int 00753 do_compare(const _CharT* __lo1, const _CharT* __hi1, 00754 const _CharT* __lo2, const _CharT* __hi2) const; 00755 00756 /** 00757 * @brief Transform string to comparable form. 00758 * 00759 * This function is a hook for derived classes to change the value 00760 * returned. 00761 * 00762 * @param __lo Start. 00763 * @param __hi End. 00764 * @return transformed string. 00765 */ 00766 virtual string_type 00767 do_transform(const _CharT* __lo, const _CharT* __hi) const; 00768 00769 /** 00770 * @brief Return hash of a string. 00771 * 00772 * This function computes and returns a hash on the input string. This 00773 * function is a hook for derived classes to change the value returned. 00774 * 00775 * @param __lo Start of string. 00776 * @param __hi End of string. 00777 * @return Hash value. 00778 */ 00779 virtual long 00780 do_hash(const _CharT* __lo, const _CharT* __hi) const; 00781 }; 00782 00783 template<typename _CharT> 00784 locale::id collate<_CharT>::id; 00785 00786 // Specializations. 00787 template<> 00788 int 00789 collate<char>::_M_compare(const char*, const char*) const throw(); 00790 00791 template<> 00792 size_t 00793 collate<char>::_M_transform(char*, const char*, size_t) const throw(); 00794 00795 #ifdef _GLIBCXX_USE_WCHAR_T 00796 template<> 00797 int 00798 collate<wchar_t>::_M_compare(const wchar_t*, const wchar_t*) const throw(); 00799 00800 template<> 00801 size_t 00802 collate<wchar_t>::_M_transform(wchar_t*, const wchar_t*, size_t) const throw(); 00803 #endif 00804 00805 /// class collate_byname [22.2.4.2]. 00806 template<typename _CharT> 00807 class _GLIBCXX_NAMESPACE_CXX11 collate_byname : public collate<_CharT> 00808 { 00809 public: 00810 //@{ 00811 /// Public typedefs 00812 typedef _CharT char_type; 00813 typedef basic_string<_CharT> string_type; 00814 //@} 00815 00816 explicit 00817 collate_byname(const char* __s, size_t __refs = 0) 00818 : collate<_CharT>(__refs) 00819 { 00820 if (__builtin_strcmp(__s, "C") != 0 00821 && __builtin_strcmp(__s, "POSIX") != 0) 00822 { 00823 this->_S_destroy_c_locale(this->_M_c_locale_collate); 00824 this->_S_create_c_locale(this->_M_c_locale_collate, __s); 00825 } 00826 } 00827 00828 #if __cplusplus >= 201103L 00829 explicit 00830 collate_byname(const string& __s, size_t __refs = 0) 00831 : collate_byname(__s.c_str(), __refs) { } 00832 #endif 00833 00834 protected: 00835 virtual 00836 ~collate_byname() { } 00837 }; 00838 00839 _GLIBCXX_END_NAMESPACE_VERSION 00840 } // namespace 00841 00842 # include <bits/locale_classes.tcc> 00843 00844 #endif