1 // Locale support -*- C++ -*- 2 3 // Copyright (C) 1997-2020 Free Software Foundation, Inc. 4 // 5 // This file is part of the GNU ISO C++ Library. This library is free 6 // software; you can redistribute it and/or modify it under the 7 // terms of the GNU General Public License as published by the 8 // Free Software Foundation; either version 3, or (at your option) 9 // any later version. 10 11 // This library is distributed in the hope that it will be useful, 12 // but WITHOUT ANY WARRANTY; without even the implied warranty of 13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 // GNU General Public License for more details. 15 16 // Under Section 7 of GPL version 3, you are granted additional 17 // permissions described in the GCC Runtime Library Exception, version 18 // 3.1, as published by the Free Software Foundation. 19 20 // You should have received a copy of the GNU General Public License and 21 // a copy of the GCC Runtime Library Exception along with this program; 22 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 23 // <http://www.gnu.org/licenses/>. 24 25 /** @file bits/locale_classes.h 26 * This is an internal header file, included by other library headers. 27 * Do not attempt to use it directly. @headername{locale} 28 */ 29 30 // 31 // ISO C++ 14882: 22.1 Locales 32 // 33 34 #ifndef _LOCALE_CLASSES_H 35 #define _LOCALE_CLASSES_H 1 36 37 #pragma GCC system_header 38 39 #include <bits/localefwd.h> 40 #include <string> 41 #include <ext/atomicity.h> 42 43 namespace std _GLIBCXX_VISIBILITY(default) 44 { 45 _GLIBCXX_BEGIN_NAMESPACE_VERSION 46 47 // 22.1.1 Class locale 48 /** 49 * @brief Container class for localization functionality. 50 * @ingroup locales 51 * 52 * The locale class is first a class wrapper for C library locales. It is 53 * also an extensible container for user-defined localization. A locale is 54 * a collection of facets that implement various localization features such 55 * as money, time, and number printing. 56 * 57 * Constructing C++ locales does not change the C library locale. 58 * 59 * This library supports efficient construction and copying of locales 60 * through a reference counting implementation of the locale class. 61 */ 62 class locale 63 { 64 public: 65 // Types: 66 /// Definition of locale::category. 67 typedef int category; 68 69 // Forward decls and friends: 70 class facet; 71 class id; 72 class _Impl; 73 74 friend class facet; 75 friend class _Impl; 76 77 template<typename _Facet> 78 friend bool 79 has_facet(const locale&) throw(); 80 81 template<typename _Facet> 82 friend const _Facet& 83 use_facet(const locale&); 84 85 template<typename _Cache> 86 friend struct __use_cache; 87 88 //@{ 89 /** 90 * @brief Category values. 91 * 92 * The standard category values are none, ctype, numeric, collate, time, 93 * monetary, and messages. They form a bitmask that supports union and 94 * intersection. The category all is the union of these values. 95 * 96 * NB: Order must match _S_facet_categories definition in locale.cc 97 */ 98 static const category none = 0; 99 static const category ctype = 1L << 0; 100 static const category numeric = 1L << 1; 101 static const category collate = 1L << 2; 102 static const category time = 1L << 3; 103 static const category monetary = 1L << 4; 104 static const category messages = 1L << 5; 105 static const category all = (ctype | numeric | collate | 106 time | monetary | messages); 107 //@} 108 109 // Construct/copy/destroy: 110 111 /** 112 * @brief Default constructor. 113 * 114 * Constructs a copy of the global locale. If no locale has been 115 * explicitly set, this is the C locale. 116 */ 117 locale() throw(); 118 119 /** 120 * @brief Copy constructor. 121 * 122 * Constructs a copy of @a other. 123 * 124 * @param __other The locale to copy. 125 */ 126 locale(const locale& __other) throw(); 127 128 /** 129 * @brief Named locale constructor. 130 * 131 * Constructs a copy of the named C library locale. 132 * 133 * @param __s Name of the locale to construct. 134 * @throw std::runtime_error if __s is null or an undefined locale. 135 */ 136 explicit 137 locale(const char* __s); 138 139 /** 140 * @brief Construct locale with facets from another locale. 141 * 142 * Constructs a copy of the locale @a base. The facets specified by @a 143 * cat are replaced with those from the locale named by @a s. If base is 144 * named, this locale instance will also be named. 145 * 146 * @param __base The locale to copy. 147 * @param __s Name of the locale to use facets from. 148 * @param __cat Set of categories defining the facets to use from __s. 149 * @throw std::runtime_error if __s is null or an undefined locale. 150 */ 151 locale(const locale& __base, const char* __s, category __cat); 152 153 #if __cplusplus >= 201103L 154 /** 155 * @brief Named locale constructor. 156 * 157 * Constructs a copy of the named C library locale. 158 * 159 * @param __s Name of the locale to construct. 160 * @throw std::runtime_error if __s is an undefined locale. 161 */ 162 explicit 163 locale(const std::string& __s) : locale(__s.c_str()) { } 164 165 /** 166 * @brief Construct locale with facets from another locale. 167 * 168 * Constructs a copy of the locale @a base. The facets specified by @a 169 * cat are replaced with those from the locale named by @a s. If base is 170 * named, this locale instance will also be named. 171 * 172 * @param __base The locale to copy. 173 * @param __s Name of the locale to use facets from. 174 * @param __cat Set of categories defining the facets to use from __s. 175 * @throw std::runtime_error if __s is an undefined locale. 176 */ 177 locale(const locale& __base, const std::string& __s, category __cat) 178 : locale(__base, __s.c_str(), __cat) { } 179 #endif 180 181 /** 182 * @brief Construct locale with facets from another locale. 183 * 184 * Constructs a copy of the locale @a base. The facets specified by @a 185 * cat are replaced with those from the locale @a add. If @a base and @a 186 * add are named, this locale instance will also be named. 187 * 188 * @param __base The locale to copy. 189 * @param __add The locale to use facets from. 190 * @param __cat Set of categories defining the facets to use from add. 191 */ 192 locale(const locale& __base, const locale& __add, category __cat); 193 194 /** 195 * @brief Construct locale with another facet. 196 * 197 * Constructs a copy of the locale @a __other. The facet @a __f 198 * is added to @a __other, replacing an existing facet of type 199 * Facet if there is one. If @a __f is null, this locale is a 200 * copy of @a __other. 201 * 202 * @param __other The locale to copy. 203 * @param __f The facet to add in. 204 */ 205 template<typename _Facet> 206 locale(const locale& __other, _Facet* __f); 207 208 /// Locale destructor. 209 ~locale() throw(); 210 211 /** 212 * @brief Assignment operator. 213 * 214 * Set this locale to be a copy of @a other. 215 * 216 * @param __other The locale to copy. 217 * @return A reference to this locale. 218 */ 219 const locale& 220 operator=(const locale& __other) throw(); 221 222 /** 223 * @brief Construct locale with another facet. 224 * 225 * Constructs and returns a new copy of this locale. Adds or replaces an 226 * existing facet of type Facet from the locale @a other into the new 227 * locale. 228 * 229 * @tparam _Facet The facet type to copy from other 230 * @param __other The locale to copy from. 231 * @return Newly constructed locale. 232 * @throw std::runtime_error if __other has no facet of type _Facet. 233 */ 234 template<typename _Facet> 235 locale 236 combine(const locale& __other) const; 237 238 // Locale operations: 239 /** 240 * @brief Return locale name. 241 * @return Locale name or "*" if unnamed. 242 */ 243 _GLIBCXX_DEFAULT_ABI_TAG 244 string 245 name() const; 246 247 /** 248 * @brief Locale equality. 249 * 250 * @param __other The locale to compare against. 251 * @return True if other and this refer to the same locale instance, are 252 * copies, or have the same name. False otherwise. 253 */ 254 bool 255 operator==(const locale& __other) const throw(); 256 257 #if __cpp_impl_three_way_comparison < 201907L 258 /** 259 * @brief Locale inequality. 260 * 261 * @param __other The locale to compare against. 262 * @return ! (*this == __other) 263 */ 264 bool 265 operator!=(const locale& __other) const throw() 266 { return !(this->operator==(__other)); } 267 #endif 268 269 /** 270 * @brief Compare two strings according to collate. 271 * 272 * Template operator to compare two strings using the compare function of 273 * the collate facet in this locale. One use is to provide the locale to 274 * the sort function. For example, a vector v of strings could be sorted 275 * according to locale loc by doing: 276 * @code 277 * std::sort(v.begin(), v.end(), loc); 278 * @endcode 279 * 280 * @param __s1 First string to compare. 281 * @param __s2 Second string to compare. 282 * @return True if collate<_Char> facet compares __s1 < __s2, else false. 283 */ 284 template<typename _Char, typename _Traits, typename _Alloc> 285 bool 286 operator()(const basic_string<_Char, _Traits, _Alloc>& __s1, 287 const basic_string<_Char, _Traits, _Alloc>& __s2) const; 288 289 // Global locale objects: 290 /** 291 * @brief Set global locale 292 * 293 * This function sets the global locale to the argument and returns a 294 * copy of the previous global locale. If the argument has a name, it 295 * will also call std::setlocale(LC_ALL, loc.name()). 296 * 297 * @param __loc The new locale to make global. 298 * @return Copy of the old global locale. 299 */ 300 static locale 301 global(const locale& __loc); 302 303 /** 304 * @brief Return reference to the C locale. 305 */ 306 static const locale& 307 classic(); 308 309 private: 310 // The (shared) implementation 311 _Impl* _M_impl; 312 313 // The "C" reference locale 314 static _Impl* _S_classic; 315 316 // Current global locale 317 static _Impl* _S_global; 318 319 // Names of underlying locale categories. 320 // NB: locale::global() has to know how to modify all the 321 // underlying categories, not just the ones required by the C++ 322 // standard. 323 static const char* const* const _S_categories; 324 325 // Number of standard categories. For C++, these categories are 326 // collate, ctype, monetary, numeric, time, and messages. These 327 // directly correspond to ISO C99 macros LC_COLLATE, LC_CTYPE, 328 // LC_MONETARY, LC_NUMERIC, and LC_TIME. In addition, POSIX (IEEE 329 // 1003.1-2001) specifies LC_MESSAGES. 330 // In addition to the standard categories, the underlying 331 // operating system is allowed to define extra LC_* 332 // macros. For GNU systems, the following are also valid: 333 // LC_PAPER, LC_NAME, LC_ADDRESS, LC_TELEPHONE, LC_MEASUREMENT, 334 // and LC_IDENTIFICATION. 335 enum { _S_categories_size = 6 + _GLIBCXX_NUM_CATEGORIES }; 336 337 #ifdef __GTHREADS 338 static __gthread_once_t _S_once; 339 #endif 340 341 explicit 342 locale(_Impl*) throw(); 343 344 static void 345 _S_initialize(); 346 347 static void 348 _S_initialize_once() throw(); 349 350 static category 351 _S_normalize_category(category); 352 353 void 354 _M_coalesce(const locale& __base, const locale& __add, category __cat); 355 356 #if _GLIBCXX_USE_CXX11_ABI 357 static const id* const _S_twinned_facets[]; 358 #endif 359 }; 360 361 362 // 22.1.1.1.2 Class locale::facet 363 /** 364 * @brief Localization functionality base class. 365 * @ingroup locales 366 * 367 * The facet class is the base class for a localization feature, such as 368 * money, time, and number printing. It provides common support for facets 369 * and reference management. 370 * 371 * Facets may not be copied or assigned. 372 */ 373 class locale::facet 374 { 375 private: 376 friend class locale; 377 friend class locale::_Impl; 378 379 mutable _Atomic_word _M_refcount; 380 381 // Contains data from the underlying "C" library for the classic locale. 382 static __c_locale _S_c_locale; 383 384 // String literal for the name of the classic locale. 385 static const char _S_c_name[2]; 386 387 #ifdef __GTHREADS 388 static __gthread_once_t _S_once; 389 #endif 390 391 static void 392 _S_initialize_once(); 393 394 protected: 395 /** 396 * @brief Facet constructor. 397 * 398 * This is the constructor provided by the standard. If refs is 0, the 399 * facet is destroyed when the last referencing locale is destroyed. 400 * Otherwise the facet will never be destroyed. 401 * 402 * @param __refs The initial value for reference count. 403 */ 404 explicit 405 facet(size_t __refs = 0) throw() : _M_refcount(__refs ? 1 : 0) 406 { } 407 408 /// Facet destructor. 409 virtual 410 ~facet(); 411 412 static void 413 _S_create_c_locale(__c_locale& __cloc, const char* __s, 414 __c_locale __old = 0); 415 416 static __c_locale 417 _S_clone_c_locale(__c_locale& __cloc) throw(); 418 419 static void 420 _S_destroy_c_locale(__c_locale& __cloc); 421 422 static __c_locale 423 _S_lc_ctype_c_locale(__c_locale __cloc, const char* __s); 424 425 // Returns data from the underlying "C" library data for the 426 // classic locale. 427 static __c_locale 428 _S_get_c_locale(); 429 430 _GLIBCXX_CONST static const char* 431 _S_get_c_name() throw(); 432 433 #if __cplusplus < 201103L 434 private: 435 facet(const facet&); // Not defined. 436 437 facet& 438 operator=(const facet&); // Not defined. 439 #else 440 facet(const facet&) = delete; 441 442 facet& 443 operator=(const facet&) = delete; 444 #endif 445 446 private: 447 void 448 _M_add_reference() const throw() 449 { __gnu_cxx::__atomic_add_dispatch(&_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 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 }; 629 630 631 /** 632 * @brief Facet for localized string comparison. 633 * 634 * This facet encapsulates the code to compare strings in a localized 635 * manner. 636 * 637 * The collate template uses protected virtual functions to provide 638 * the actual results. The public accessors forward the call to 639 * the virtual functions. These virtual functions are hooks for 640 * developers to implement the behavior they require from the 641 * collate facet. 642 */ 643 template<typename _CharT> 644 class _GLIBCXX_NAMESPACE_CXX11 collate : public locale::facet 645 { 646 public: 647 // Types: 648 //@{ 649 /// Public typedefs 650 typedef _CharT char_type; 651 typedef basic_string<_CharT> string_type; 652 //@} 653 654 protected: 655 // Underlying "C" library locale information saved from 656 // initialization, needed by collate_byname as well. 657 __c_locale _M_c_locale_collate; 658 659 public: 660 /// Numpunct facet id. 661 static locale::id id; 662 663 /** 664 * @brief Constructor performs initialization. 665 * 666 * This is the constructor provided by the standard. 667 * 668 * @param __refs Passed to the base facet class. 669 */ 670 explicit 671 collate(size_t __refs = 0) 672 : facet(__refs), _M_c_locale_collate(_S_get_c_locale()) 673 { } 674 675 /** 676 * @brief Internal constructor. Not for general use. 677 * 678 * This is a constructor for use by the library itself to set up new 679 * locales. 680 * 681 * @param __cloc The C locale. 682 * @param __refs Passed to the base facet class. 683 */ 684 explicit 685 collate(__c_locale __cloc, size_t __refs = 0) 686 : facet(__refs), _M_c_locale_collate(_S_clone_c_locale(__cloc)) 687 { } 688 689 /** 690 * @brief Compare two strings. 691 * 692 * This function compares two strings and returns the result by calling 693 * collate::do_compare(). 694 * 695 * @param __lo1 Start of string 1. 696 * @param __hi1 End of string 1. 697 * @param __lo2 Start of string 2. 698 * @param __hi2 End of string 2. 699 * @return 1 if string1 > string2, -1 if string1 < string2, else 0. 700 */ 701 int 702 compare(const _CharT* __lo1, const _CharT* __hi1, 703 const _CharT* __lo2, const _CharT* __hi2) const 704 { return this->do_compare(__lo1, __hi1, __lo2, __hi2); } 705 706 /** 707 * @brief Transform string to comparable form. 708 * 709 * This function is a wrapper for strxfrm functionality. It takes the 710 * input string and returns a modified string that can be directly 711 * compared to other transformed strings. In the C locale, this 712 * function just returns a copy of the input string. In some other 713 * locales, it may replace two chars with one, change a char for 714 * another, etc. It does so by returning collate::do_transform(). 715 * 716 * @param __lo Start of string. 717 * @param __hi End of string. 718 * @return Transformed string_type. 719 */ 720 string_type 721 transform(const _CharT* __lo, const _CharT* __hi) const 722 { return this->do_transform(__lo, __hi); } 723 724 /** 725 * @brief Return hash of a string. 726 * 727 * This function computes and returns a hash on the input string. It 728 * does so by returning collate::do_hash(). 729 * 730 * @param __lo Start of string. 731 * @param __hi End of string. 732 * @return Hash value. 733 */ 734 long 735 hash(const _CharT* __lo, const _CharT* __hi) const 736 { return this->do_hash(__lo, __hi); } 737 738 // Used to abstract out _CharT bits in virtual member functions, below. 739 int 740 _M_compare(const _CharT*, const _CharT*) const throw(); 741 742 size_t 743 _M_transform(_CharT*, const _CharT*, size_t) const throw(); 744 745 protected: 746 /// Destructor. 747 virtual 748 ~collate() 749 { _S_destroy_c_locale(_M_c_locale_collate); } 750 751 /** 752 * @brief Compare two strings. 753 * 754 * This function is a hook for derived classes to change the value 755 * returned. @see compare(). 756 * 757 * @param __lo1 Start of string 1. 758 * @param __hi1 End of string 1. 759 * @param __lo2 Start of string 2. 760 * @param __hi2 End of string 2. 761 * @return 1 if string1 > string2, -1 if string1 < string2, else 0. 762 */ 763 virtual int 764 do_compare(const _CharT* __lo1, const _CharT* __hi1, 765 const _CharT* __lo2, const _CharT* __hi2) const; 766 767 /** 768 * @brief Transform string to comparable form. 769 * 770 * This function is a hook for derived classes to change the value 771 * returned. 772 * 773 * @param __lo Start. 774 * @param __hi End. 775 * @return transformed string. 776 */ 777 virtual string_type 778 do_transform(const _CharT* __lo, const _CharT* __hi) const; 779 780 /** 781 * @brief Return hash of a string. 782 * 783 * This function computes and returns a hash on the input string. This 784 * function is a hook for derived classes to change the value returned. 785 * 786 * @param __lo Start of string. 787 * @param __hi End of string. 788 * @return Hash value. 789 */ 790 virtual long 791 do_hash(const _CharT* __lo, const _CharT* __hi) const; 792 }; 793 794 template<typename _CharT> 795 locale::id collate<_CharT>::id; 796 797 // Specializations. 798 template<> 799 int 800 collate<char>::_M_compare(const char*, const char*) const throw(); 801 802 template<> 803 size_t 804 collate<char>::_M_transform(char*, const char*, size_t) const throw(); 805 806 #ifdef _GLIBCXX_USE_WCHAR_T 807 template<> 808 int 809 collate<wchar_t>::_M_compare(const wchar_t*, const wchar_t*) const throw(); 810 811 template<> 812 size_t 813 collate<wchar_t>::_M_transform(wchar_t*, const wchar_t*, size_t) const throw(); 814 #endif 815 816 /// class collate_byname [22.2.4.2]. 817 template<typename _CharT> 818 class _GLIBCXX_NAMESPACE_CXX11 collate_byname : public collate<_CharT> 819 { 820 public: 821 //@{ 822 /// Public typedefs 823 typedef _CharT char_type; 824 typedef basic_string<_CharT> string_type; 825 //@} 826 827 explicit 828 collate_byname(const char* __s, size_t __refs = 0) 829 : collate<_CharT>(__refs) 830 { 831 if (__builtin_strcmp(__s, "C") != 0 832 && __builtin_strcmp(__s, "POSIX") != 0) 833 { 834 this->_S_destroy_c_locale(this->_M_c_locale_collate); 835 this->_S_create_c_locale(this->_M_c_locale_collate, __s); 836 } 837 } 838 839 #if __cplusplus >= 201103L 840 explicit 841 collate_byname(const string& __s, size_t __refs = 0) 842 : collate_byname(__s.c_str(), __refs) { } 843 #endif 844 845 protected: 846 virtual 847 ~collate_byname() { } 848 }; 849 850 _GLIBCXX_END_NAMESPACE_VERSION 851 } // namespace 852 853 # include <bits/locale_classes.tcc> 854 855 #endif 856