libstdc++
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00001 // Locale support -*- C++ -*- 00002 00003 // Copyright (C) 1997-2019 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 #if __cplusplus < 201103L 00432 private: 00433 facet(const facet&); // Not defined. 00434 00435 facet& 00436 operator=(const facet&); // Not defined. 00437 #else 00438 facet(const facet&) = delete; 00439 00440 facet& 00441 operator=(const facet&) = delete; 00442 #endif 00443 00444 private: 00445 void 00446 _M_add_reference() const throw() 00447 { __gnu_cxx::__atomic_add_dispatch(&_M_refcount, 1); } 00448 00449 void 00450 _M_remove_reference() const throw() 00451 { 00452 // Be race-detector-friendly. For more info see bits/c++config. 00453 _GLIBCXX_SYNCHRONIZATION_HAPPENS_BEFORE(&_M_refcount); 00454 if (__gnu_cxx::__exchange_and_add_dispatch(&_M_refcount, -1) == 1) 00455 { 00456 _GLIBCXX_SYNCHRONIZATION_HAPPENS_AFTER(&_M_refcount); 00457 __try 00458 { delete this; } 00459 __catch(...) 00460 { } 00461 } 00462 } 00463 00464 const facet* _M_sso_shim(const id*) const; 00465 const facet* _M_cow_shim(const id*) const; 00466 00467 protected: 00468 class __shim; // For internal use only. 00469 }; 00470 00471 00472 // 22.1.1.1.3 Class locale::id 00473 /** 00474 * @brief Facet ID class. 00475 * @ingroup locales 00476 * 00477 * The ID class provides facets with an index used to identify them. 00478 * Every facet class must define a public static member locale::id, or be 00479 * derived from a facet that provides this member, otherwise the facet 00480 * cannot be used in a locale. The locale::id ensures that each class 00481 * type gets a unique identifier. 00482 */ 00483 class locale::id 00484 { 00485 private: 00486 friend class locale; 00487 friend class locale::_Impl; 00488 00489 template<typename _Facet> 00490 friend const _Facet& 00491 use_facet(const locale&); 00492 00493 template<typename _Facet> 00494 friend bool 00495 has_facet(const locale&) throw(); 00496 00497 // NB: There is no accessor for _M_index because it may be used 00498 // before the constructor is run; the effect of calling a member 00499 // function (even an inline) would be undefined. 00500 mutable size_t _M_index; 00501 00502 // Last id number assigned. 00503 static _Atomic_word _S_refcount; 00504 00505 void 00506 operator=(const id&); // Not defined. 00507 00508 id(const id&); // Not defined. 00509 00510 public: 00511 // NB: This class is always a static data member, and thus can be 00512 // counted on to be zero-initialized. 00513 /// Constructor. 00514 id() { } 00515 00516 size_t 00517 _M_id() const throw(); 00518 }; 00519 00520 00521 // Implementation object for locale. 00522 class locale::_Impl 00523 { 00524 public: 00525 // Friends. 00526 friend class locale; 00527 friend class locale::facet; 00528 00529 template<typename _Facet> 00530 friend bool 00531 has_facet(const locale&) throw(); 00532 00533 template<typename _Facet> 00534 friend const _Facet& 00535 use_facet(const locale&); 00536 00537 template<typename _Cache> 00538 friend struct __use_cache; 00539 00540 private: 00541 // Data Members. 00542 _Atomic_word _M_refcount; 00543 const facet** _M_facets; 00544 size_t _M_facets_size; 00545 const facet** _M_caches; 00546 char** _M_names; 00547 static const locale::id* const _S_id_ctype[]; 00548 static const locale::id* const _S_id_numeric[]; 00549 static const locale::id* const _S_id_collate[]; 00550 static const locale::id* const _S_id_time[]; 00551 static const locale::id* const _S_id_monetary[]; 00552 static const locale::id* const _S_id_messages[]; 00553 static const locale::id* const* const _S_facet_categories[]; 00554 00555 void 00556 _M_add_reference() throw() 00557 { __gnu_cxx::__atomic_add_dispatch(&_M_refcount, 1); } 00558 00559 void 00560 _M_remove_reference() throw() 00561 { 00562 // Be race-detector-friendly. For more info see bits/c++config. 00563 _GLIBCXX_SYNCHRONIZATION_HAPPENS_BEFORE(&_M_refcount); 00564 if (__gnu_cxx::__exchange_and_add_dispatch(&_M_refcount, -1) == 1) 00565 { 00566 _GLIBCXX_SYNCHRONIZATION_HAPPENS_AFTER(&_M_refcount); 00567 __try 00568 { delete this; } 00569 __catch(...) 00570 { } 00571 } 00572 } 00573 00574 _Impl(const _Impl&, size_t); 00575 _Impl(const char*, size_t); 00576 _Impl(size_t) throw(); 00577 00578 ~_Impl() throw(); 00579 00580 _Impl(const _Impl&); // Not defined. 00581 00582 void 00583 operator=(const _Impl&); // Not defined. 00584 00585 bool 00586 _M_check_same_name() 00587 { 00588 bool __ret = true; 00589 if (_M_names[1]) 00590 // We must actually compare all the _M_names: can be all equal! 00591 for (size_t __i = 0; __ret && __i < _S_categories_size - 1; ++__i) 00592 __ret = __builtin_strcmp(_M_names[__i], _M_names[__i + 1]) == 0; 00593 return __ret; 00594 } 00595 00596 void 00597 _M_replace_categories(const _Impl*, category); 00598 00599 void 00600 _M_replace_category(const _Impl*, const locale::id* const*); 00601 00602 void 00603 _M_replace_facet(const _Impl*, const locale::id*); 00604 00605 void 00606 _M_install_facet(const locale::id*, const facet*); 00607 00608 template<typename _Facet> 00609 void 00610 _M_init_facet(_Facet* __facet) 00611 { _M_install_facet(&_Facet::id, __facet); } 00612 00613 template<typename _Facet> 00614 void 00615 _M_init_facet_unchecked(_Facet* __facet) 00616 { 00617 __facet->_M_add_reference(); 00618 _M_facets[_Facet::id._M_id()] = __facet; 00619 } 00620 00621 void 00622 _M_install_cache(const facet*, size_t); 00623 00624 void _M_init_extra(facet**); 00625 void _M_init_extra(void*, void*, const char*, const char*); 00626 }; 00627 00628 00629 /** 00630 * @brief Facet for localized string comparison. 00631 * 00632 * This facet encapsulates the code to compare strings in a localized 00633 * manner. 00634 * 00635 * The collate template uses protected virtual functions to provide 00636 * the actual results. The public accessors forward the call to 00637 * the virtual functions. These virtual functions are hooks for 00638 * developers to implement the behavior they require from the 00639 * collate facet. 00640 */ 00641 template<typename _CharT> 00642 class _GLIBCXX_NAMESPACE_CXX11 collate : public locale::facet 00643 { 00644 public: 00645 // Types: 00646 //@{ 00647 /// Public typedefs 00648 typedef _CharT char_type; 00649 typedef basic_string<_CharT> string_type; 00650 //@} 00651 00652 protected: 00653 // Underlying "C" library locale information saved from 00654 // initialization, needed by collate_byname as well. 00655 __c_locale _M_c_locale_collate; 00656 00657 public: 00658 /// Numpunct facet id. 00659 static locale::id id; 00660 00661 /** 00662 * @brief Constructor performs initialization. 00663 * 00664 * This is the constructor provided by the standard. 00665 * 00666 * @param __refs Passed to the base facet class. 00667 */ 00668 explicit 00669 collate(size_t __refs = 0) 00670 : facet(__refs), _M_c_locale_collate(_S_get_c_locale()) 00671 { } 00672 00673 /** 00674 * @brief Internal constructor. Not for general use. 00675 * 00676 * This is a constructor for use by the library itself to set up new 00677 * locales. 00678 * 00679 * @param __cloc The C locale. 00680 * @param __refs Passed to the base facet class. 00681 */ 00682 explicit 00683 collate(__c_locale __cloc, size_t __refs = 0) 00684 : facet(__refs), _M_c_locale_collate(_S_clone_c_locale(__cloc)) 00685 { } 00686 00687 /** 00688 * @brief Compare two strings. 00689 * 00690 * This function compares two strings and returns the result by calling 00691 * collate::do_compare(). 00692 * 00693 * @param __lo1 Start of string 1. 00694 * @param __hi1 End of string 1. 00695 * @param __lo2 Start of string 2. 00696 * @param __hi2 End of string 2. 00697 * @return 1 if string1 > string2, -1 if string1 < string2, else 0. 00698 */ 00699 int 00700 compare(const _CharT* __lo1, const _CharT* __hi1, 00701 const _CharT* __lo2, const _CharT* __hi2) const 00702 { return this->do_compare(__lo1, __hi1, __lo2, __hi2); } 00703 00704 /** 00705 * @brief Transform string to comparable form. 00706 * 00707 * This function is a wrapper for strxfrm functionality. It takes the 00708 * input string and returns a modified string that can be directly 00709 * compared to other transformed strings. In the C locale, this 00710 * function just returns a copy of the input string. In some other 00711 * locales, it may replace two chars with one, change a char for 00712 * another, etc. It does so by returning collate::do_transform(). 00713 * 00714 * @param __lo Start of string. 00715 * @param __hi End of string. 00716 * @return Transformed string_type. 00717 */ 00718 string_type 00719 transform(const _CharT* __lo, const _CharT* __hi) const 00720 { return this->do_transform(__lo, __hi); } 00721 00722 /** 00723 * @brief Return hash of a string. 00724 * 00725 * This function computes and returns a hash on the input string. It 00726 * does so by returning collate::do_hash(). 00727 * 00728 * @param __lo Start of string. 00729 * @param __hi End of string. 00730 * @return Hash value. 00731 */ 00732 long 00733 hash(const _CharT* __lo, const _CharT* __hi) const 00734 { return this->do_hash(__lo, __hi); } 00735 00736 // Used to abstract out _CharT bits in virtual member functions, below. 00737 int 00738 _M_compare(const _CharT*, const _CharT*) const throw(); 00739 00740 size_t 00741 _M_transform(_CharT*, const _CharT*, size_t) const throw(); 00742 00743 protected: 00744 /// Destructor. 00745 virtual 00746 ~collate() 00747 { _S_destroy_c_locale(_M_c_locale_collate); } 00748 00749 /** 00750 * @brief Compare two strings. 00751 * 00752 * This function is a hook for derived classes to change the value 00753 * returned. @see compare(). 00754 * 00755 * @param __lo1 Start of string 1. 00756 * @param __hi1 End of string 1. 00757 * @param __lo2 Start of string 2. 00758 * @param __hi2 End of string 2. 00759 * @return 1 if string1 > string2, -1 if string1 < string2, else 0. 00760 */ 00761 virtual int 00762 do_compare(const _CharT* __lo1, const _CharT* __hi1, 00763 const _CharT* __lo2, const _CharT* __hi2) const; 00764 00765 /** 00766 * @brief Transform string to comparable form. 00767 * 00768 * This function is a hook for derived classes to change the value 00769 * returned. 00770 * 00771 * @param __lo Start. 00772 * @param __hi End. 00773 * @return transformed string. 00774 */ 00775 virtual string_type 00776 do_transform(const _CharT* __lo, const _CharT* __hi) const; 00777 00778 /** 00779 * @brief Return hash of a string. 00780 * 00781 * This function computes and returns a hash on the input string. This 00782 * function is a hook for derived classes to change the value returned. 00783 * 00784 * @param __lo Start of string. 00785 * @param __hi End of string. 00786 * @return Hash value. 00787 */ 00788 virtual long 00789 do_hash(const _CharT* __lo, const _CharT* __hi) const; 00790 }; 00791 00792 template<typename _CharT> 00793 locale::id collate<_CharT>::id; 00794 00795 // Specializations. 00796 template<> 00797 int 00798 collate<char>::_M_compare(const char*, const char*) const throw(); 00799 00800 template<> 00801 size_t 00802 collate<char>::_M_transform(char*, const char*, size_t) const throw(); 00803 00804 #ifdef _GLIBCXX_USE_WCHAR_T 00805 template<> 00806 int 00807 collate<wchar_t>::_M_compare(const wchar_t*, const wchar_t*) const throw(); 00808 00809 template<> 00810 size_t 00811 collate<wchar_t>::_M_transform(wchar_t*, const wchar_t*, size_t) const throw(); 00812 #endif 00813 00814 /// class collate_byname [22.2.4.2]. 00815 template<typename _CharT> 00816 class _GLIBCXX_NAMESPACE_CXX11 collate_byname : public collate<_CharT> 00817 { 00818 public: 00819 //@{ 00820 /// Public typedefs 00821 typedef _CharT char_type; 00822 typedef basic_string<_CharT> string_type; 00823 //@} 00824 00825 explicit 00826 collate_byname(const char* __s, size_t __refs = 0) 00827 : collate<_CharT>(__refs) 00828 { 00829 if (__builtin_strcmp(__s, "C") != 0 00830 && __builtin_strcmp(__s, "POSIX") != 0) 00831 { 00832 this->_S_destroy_c_locale(this->_M_c_locale_collate); 00833 this->_S_create_c_locale(this->_M_c_locale_collate, __s); 00834 } 00835 } 00836 00837 #if __cplusplus >= 201103L 00838 explicit 00839 collate_byname(const string& __s, size_t __refs = 0) 00840 : collate_byname(__s.c_str(), __refs) { } 00841 #endif 00842 00843 protected: 00844 virtual 00845 ~collate_byname() { } 00846 }; 00847 00848 _GLIBCXX_END_NAMESPACE_VERSION 00849 } // namespace 00850 00851 # include <bits/locale_classes.tcc> 00852 00853 #endif