1 // Locale support -*- C++ -*- 2 3 // Copyright (C) 1997-2018 Free Software Foundation, Inc. 4 // 5 // This file is part of the GNU ISO C++ Library. This library is free 6 // software; you can redistribute it and/or modify it under the 7 // terms of the GNU General Public License as published by the 8 // Free Software Foundation; either version 3, or (at your option) 9 // any later version. 10 11 // This library is distributed in the hope that it will be useful, 12 // but WITHOUT ANY WARRANTY; without even the implied warranty of 13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 // GNU General Public License for more details. 15 16 // Under Section 7 of GPL version 3, you are granted additional 17 // permissions described in the GCC Runtime Library Exception, version 18 // 3.1, as published by the Free Software Foundation. 19 20 // You should have received a copy of the GNU General Public License and 21 // a copy of the GCC Runtime Library Exception along with this program; 22 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 23 // <http://www.gnu.org/licenses/>. 24 25 /** @file bits/locale_classes.h 26 * This is an internal header file, included by other library headers. 27 * Do not attempt to use it directly. @headername{locale} 28 */ 29 30 // 31 // ISO C++ 14882: 22.1 Locales 32 // 33 34 #ifndef _LOCALE_CLASSES_H 35 #define _LOCALE_CLASSES_H 1 36 37 #pragma GCC system_header 38 39 #include <bits/localefwd.h> 40 #include <string> 41 #include <ext/atomicity.h> 42 43 namespace std _GLIBCXX_VISIBILITY(default) 44 { 45 _GLIBCXX_BEGIN_NAMESPACE_VERSION 46 47 // 22.1.1 Class locale 48 /** 49 * @brief Container class for localization functionality. 50 * @ingroup locales 51 * 52 * The locale class is first a class wrapper for C library locales. It is 53 * also an extensible container for user-defined localization. A locale is 54 * a collection of facets that implement various localization features such 55 * as money, time, and number printing. 56 * 57 * Constructing C++ locales does not change the C library locale. 58 * 59 * This library supports efficient construction and copying of locales 60 * through a reference counting implementation of the locale class. 61 */ 62 class locale 63 { 64 public: 65 // Types: 66 /// Definition of locale::category. 67 typedef int category; 68 69 // Forward decls and friends: 70 class facet; 71 class id; 72 class _Impl; 73 74 friend class facet; 75 friend class _Impl; 76 77 template<typename _Facet> 78 friend bool 79 has_facet(const locale&) throw(); 80 81 template<typename _Facet> 82 friend const _Facet& 83 use_facet(const locale&); 84 85 template<typename _Cache> 86 friend struct __use_cache; 87 88 //@{ 89 /** 90 * @brief Category values. 91 * 92 * The standard category values are none, ctype, numeric, collate, time, 93 * monetary, and messages. They form a bitmask that supports union and 94 * intersection. The category all is the union of these values. 95 * 96 * NB: Order must match _S_facet_categories definition in locale.cc 97 */ 98 static const category none = 0; 99 static const category ctype = 1L << 0; 100 static const category numeric = 1L << 1; 101 static const category collate = 1L << 2; 102 static const category time = 1L << 3; 103 static const category monetary = 1L << 4; 104 static const category messages = 1L << 5; 105 static const category all = (ctype | numeric | collate | 106 time | monetary | messages); 107 //@} 108 109 // Construct/copy/destroy: 110 111 /** 112 * @brief Default constructor. 113 * 114 * Constructs a copy of the global locale. If no locale has been 115 * explicitly set, this is the C locale. 116 */ 117 locale() throw(); 118 119 /** 120 * @brief Copy constructor. 121 * 122 * Constructs a copy of @a other. 123 * 124 * @param __other The locale to copy. 125 */ 126 locale(const locale& __other) throw(); 127 128 /** 129 * @brief Named locale constructor. 130 * 131 * Constructs a copy of the named C library locale. 132 * 133 * @param __s Name of the locale to construct. 134 * @throw std::runtime_error if __s is null or an undefined locale. 135 */ 136 explicit 137 locale(const char* __s); 138 139 /** 140 * @brief Construct locale with facets from another locale. 141 * 142 * Constructs a copy of the locale @a base. The facets specified by @a 143 * cat are replaced with those from the locale named by @a s. If base is 144 * named, this locale instance will also be named. 145 * 146 * @param __base The locale to copy. 147 * @param __s Name of the locale to use facets from. 148 * @param __cat Set of categories defining the facets to use from __s. 149 * @throw std::runtime_error if __s is null or an undefined locale. 150 */ 151 locale(const locale& __base, const char* __s, category __cat); 152 153 #if __cplusplus >= 201103L 154 /** 155 * @brief Named locale constructor. 156 * 157 * Constructs a copy of the named C library locale. 158 * 159 * @param __s Name of the locale to construct. 160 * @throw std::runtime_error if __s is an undefined locale. 161 */ 162 explicit 163 locale(const std::string& __s) : locale(__s.c_str()) { } 164 165 /** 166 * @brief Construct locale with facets from another locale. 167 * 168 * Constructs a copy of the locale @a base. The facets specified by @a 169 * cat are replaced with those from the locale named by @a s. If base is 170 * named, this locale instance will also be named. 171 * 172 * @param __base The locale to copy. 173 * @param __s Name of the locale to use facets from. 174 * @param __cat Set of categories defining the facets to use from __s. 175 * @throw std::runtime_error if __s is an undefined locale. 176 */ 177 locale(const locale& __base, const std::string& __s, category __cat) 178 : locale(__base, __s.c_str(), __cat) { } 179 #endif 180 181 /** 182 * @brief Construct locale with facets from another locale. 183 * 184 * Constructs a copy of the locale @a base. The facets specified by @a 185 * cat are replaced with those from the locale @a add. If @a base and @a 186 * add are named, this locale instance will also be named. 187 * 188 * @param __base The locale to copy. 189 * @param __add The locale to use facets from. 190 * @param __cat Set of categories defining the facets to use from add. 191 */ 192 locale(const locale& __base, const locale& __add, category __cat); 193 194 /** 195 * @brief Construct locale with another facet. 196 * 197 * Constructs a copy of the locale @a __other. The facet @a __f 198 * is added to @a __other, replacing an existing facet of type 199 * Facet if there is one. If @a __f is null, this locale is a 200 * copy of @a __other. 201 * 202 * @param __other The locale to copy. 203 * @param __f The facet to add in. 204 */ 205 template<typename _Facet> 206 locale(const locale& __other, _Facet* __f); 207 208 /// Locale destructor. 209 ~locale() throw(); 210 211 /** 212 * @brief Assignment operator. 213 * 214 * Set this locale to be a copy of @a other. 215 * 216 * @param __other The locale to copy. 217 * @return A reference to this locale. 218 */ 219 const locale& 220 operator=(const locale& __other) throw(); 221 222 /** 223 * @brief Construct locale with another facet. 224 * 225 * Constructs and returns a new copy of this locale. Adds or replaces an 226 * existing facet of type Facet from the locale @a other into the new 227 * locale. 228 * 229 * @tparam _Facet The facet type to copy from other 230 * @param __other The locale to copy from. 231 * @return Newly constructed locale. 232 * @throw std::runtime_error if __other has no facet of type _Facet. 233 */ 234 template<typename _Facet> 235 locale 236 combine(const locale& __other) const; 237 238 // Locale operations: 239 /** 240 * @brief Return locale name. 241 * @return Locale name or "*" if unnamed. 242 */ 243 _GLIBCXX_DEFAULT_ABI_TAG 244 string 245 name() const; 246 247 /** 248 * @brief Locale equality. 249 * 250 * @param __other The locale to compare against. 251 * @return True if other and this refer to the same locale instance, are 252 * copies, or have the same name. False otherwise. 253 */ 254 bool 255 operator==(const locale& __other) const throw(); 256 257 /** 258 * @brief Locale inequality. 259 * 260 * @param __other The locale to compare against. 261 * @return ! (*this == __other) 262 */ 263 bool 264 operator!=(const locale& __other) const throw() 265 { return !(this->operator==(__other)); } 266 267 /** 268 * @brief Compare two strings according to collate. 269 * 270 * Template operator to compare two strings using the compare function of 271 * the collate facet in this locale. One use is to provide the locale to 272 * the sort function. For example, a vector v of strings could be sorted 273 * according to locale loc by doing: 274 * @code 275 * std::sort(v.begin(), v.end(), loc); 276 * @endcode 277 * 278 * @param __s1 First string to compare. 279 * @param __s2 Second string to compare. 280 * @return True if collate<_Char> facet compares __s1 < __s2, else false. 281 */ 282 template<typename _Char, typename _Traits, typename _Alloc> 283 bool 284 operator()(const basic_string<_Char, _Traits, _Alloc>& __s1, 285 const basic_string<_Char, _Traits, _Alloc>& __s2) const; 286 287 // Global locale objects: 288 /** 289 * @brief Set global locale 290 * 291 * This function sets the global locale to the argument and returns a 292 * copy of the previous global locale. If the argument has a name, it 293 * will also call std::setlocale(LC_ALL, loc.name()). 294 * 295 * @param __loc The new locale to make global. 296 * @return Copy of the old global locale. 297 */ 298 static locale 299 global(const locale& __loc); 300 301 /** 302 * @brief Return reference to the C locale. 303 */ 304 static const locale& 305 classic(); 306 307 private: 308 // The (shared) implementation 309 _Impl* _M_impl; 310 311 // The "C" reference locale 312 static _Impl* _S_classic; 313 314 // Current global locale 315 static _Impl* _S_global; 316 317 // Names of underlying locale categories. 318 // NB: locale::global() has to know how to modify all the 319 // underlying categories, not just the ones required by the C++ 320 // standard. 321 static const char* const* const _S_categories; 322 323 // Number of standard categories. For C++, these categories are 324 // collate, ctype, monetary, numeric, time, and messages. These 325 // directly correspond to ISO C99 macros LC_COLLATE, LC_CTYPE, 326 // LC_MONETARY, LC_NUMERIC, and LC_TIME. In addition, POSIX (IEEE 327 // 1003.1-2001) specifies LC_MESSAGES. 328 // In addition to the standard categories, the underlying 329 // operating system is allowed to define extra LC_* 330 // macros. For GNU systems, the following are also valid: 331 // LC_PAPER, LC_NAME, LC_ADDRESS, LC_TELEPHONE, LC_MEASUREMENT, 332 // and LC_IDENTIFICATION. 333 enum { _S_categories_size = 6 + _GLIBCXX_NUM_CATEGORIES }; 334 335 #ifdef __GTHREADS 336 static __gthread_once_t _S_once; 337 #endif 338 339 explicit 340 locale(_Impl*) throw(); 341 342 static void 343 _S_initialize(); 344 345 static void 346 _S_initialize_once() throw(); 347 348 static category 349 _S_normalize_category(category); 350 351 void 352 _M_coalesce(const locale& __base, const locale& __add, category __cat); 353 354 #if _GLIBCXX_USE_CXX11_ABI 355 static const id* const _S_twinned_facets[]; 356 #endif 357 }; 358 359 360 // 22.1.1.1.2 Class locale::facet 361 /** 362 * @brief Localization functionality base class. 363 * @ingroup locales 364 * 365 * The facet class is the base class for a localization feature, such as 366 * money, time, and number printing. It provides common support for facets 367 * and reference management. 368 * 369 * Facets may not be copied or assigned. 370 */ 371 class locale::facet 372 { 373 private: 374 friend class locale; 375 friend class locale::_Impl; 376 377 mutable _Atomic_word _M_refcount; 378 379 // Contains data from the underlying "C" library for the classic locale. 380 static __c_locale _S_c_locale; 381 382 // String literal for the name of the classic locale. 383 static const char _S_c_name[2]; 384 385 #ifdef __GTHREADS 386 static __gthread_once_t _S_once; 387 #endif 388 389 static void 390 _S_initialize_once(); 391 392 protected: 393 /** 394 * @brief Facet constructor. 395 * 396 * This is the constructor provided by the standard. If refs is 0, the 397 * facet is destroyed when the last referencing locale is destroyed. 398 * Otherwise the facet will never be destroyed. 399 * 400 * @param __refs The initial value for reference count. 401 */ 402 explicit 403 facet(size_t __refs = 0) throw() : _M_refcount(__refs ? 1 : 0) 404 { } 405 406 /// Facet destructor. 407 virtual 408 ~facet(); 409 410 static void 411 _S_create_c_locale(__c_locale& __cloc, const char* __s, 412 __c_locale __old = 0); 413 414 static __c_locale 415 _S_clone_c_locale(__c_locale& __cloc) throw(); 416 417 static void 418 _S_destroy_c_locale(__c_locale& __cloc); 419 420 static __c_locale 421 _S_lc_ctype_c_locale(__c_locale __cloc, const char* __s); 422 423 // Returns data from the underlying "C" library data for the 424 // classic locale. 425 static __c_locale 426 _S_get_c_locale(); 427 428 _GLIBCXX_CONST static const char* 429 _S_get_c_name() throw(); 430 431 #if __cplusplus < 201103L 432 private: 433 facet(const facet&); // Not defined. 434 435 facet& 436 operator=(const facet&); // Not defined. 437 #else 438 facet(const facet&) = delete; 439 440 facet& 441 operator=(const facet&) = delete; 442 #endif 443 444 private: 445 void 446 _M_add_reference() const throw() 447 { __gnu_cxx::__atomic_add_dispatch(&_M_refcount, 1); } 448 449 void 450 _M_remove_reference() const throw() 451 { 452 // Be race-detector-friendly. For more info see bits/c++config. 453 _GLIBCXX_SYNCHRONIZATION_HAPPENS_BEFORE(&_M_refcount); 454 if (__gnu_cxx::__exchange_and_add_dispatch(&_M_refcount, -1) == 1) 455 { 456 _GLIBCXX_SYNCHRONIZATION_HAPPENS_AFTER(&_M_refcount); 457 __try 458 { delete this; } 459 __catch(...) 460 { } 461 } 462 } 463 464 const facet* _M_sso_shim(const id*) const; 465 const facet* _M_cow_shim(const id*) const; 466 467 protected: 468 class __shim; // For internal use only. 469 }; 470 471 472 // 22.1.1.1.3 Class locale::id 473 /** 474 * @brief Facet ID class. 475 * @ingroup locales 476 * 477 * The ID class provides facets with an index used to identify them. 478 * Every facet class must define a public static member locale::id, or be 479 * derived from a facet that provides this member, otherwise the facet 480 * cannot be used in a locale. The locale::id ensures that each class 481 * type gets a unique identifier. 482 */ 483 class locale::id 484 { 485 private: 486 friend class locale; 487 friend class locale::_Impl; 488 489 template<typename _Facet> 490 friend const _Facet& 491 use_facet(const locale&); 492 493 template<typename _Facet> 494 friend bool 495 has_facet(const locale&) throw(); 496 497 // NB: There is no accessor for _M_index because it may be used 498 // before the constructor is run; the effect of calling a member 499 // function (even an inline) would be undefined. 500 mutable size_t _M_index; 501 502 // Last id number assigned. 503 static _Atomic_word _S_refcount; 504 505 void 506 operator=(const id&); // Not defined. 507 508 id(const id&); // Not defined. 509 510 public: 511 // NB: This class is always a static data member, and thus can be 512 // counted on to be zero-initialized. 513 /// Constructor. 514 id() { } 515 516 size_t 517 _M_id() const throw(); 518 }; 519 520 521 // Implementation object for locale. 522 class locale::_Impl 523 { 524 public: 525 // Friends. 526 friend class locale; 527 friend class locale::facet; 528 529 template<typename _Facet> 530 friend bool 531 has_facet(const locale&) throw(); 532 533 template<typename _Facet> 534 friend const _Facet& 535 use_facet(const locale&); 536 537 template<typename _Cache> 538 friend struct __use_cache; 539 540 private: 541 // Data Members. 542 _Atomic_word _M_refcount; 543 const facet** _M_facets; 544 size_t _M_facets_size; 545 const facet** _M_caches; 546 char** _M_names; 547 static const locale::id* const _S_id_ctype[]; 548 static const locale::id* const _S_id_numeric[]; 549 static const locale::id* const _S_id_collate[]; 550 static const locale::id* const _S_id_time[]; 551 static const locale::id* const _S_id_monetary[]; 552 static const locale::id* const _S_id_messages[]; 553 static const locale::id* const* const _S_facet_categories[]; 554 555 void 556 _M_add_reference() throw() 557 { __gnu_cxx::__atomic_add_dispatch(&_M_refcount, 1); } 558 559 void 560 _M_remove_reference() throw() 561 { 562 // Be race-detector-friendly. For more info see bits/c++config. 563 _GLIBCXX_SYNCHRONIZATION_HAPPENS_BEFORE(&_M_refcount); 564 if (__gnu_cxx::__exchange_and_add_dispatch(&_M_refcount, -1) == 1) 565 { 566 _GLIBCXX_SYNCHRONIZATION_HAPPENS_AFTER(&_M_refcount); 567 __try 568 { delete this; } 569 __catch(...) 570 { } 571 } 572 } 573 574 _Impl(const _Impl&, size_t); 575 _Impl(const char*, size_t); 576 _Impl(size_t) throw(); 577 578 ~_Impl() throw(); 579 580 _Impl(const _Impl&); // Not defined. 581 582 void 583 operator=(const _Impl&); // Not defined. 584 585 bool 586 _M_check_same_name() 587 { 588 bool __ret = true; 589 if (_M_names[1]) 590 // We must actually compare all the _M_names: can be all equal! 591 for (size_t __i = 0; __ret && __i < _S_categories_size - 1; ++__i) 592 __ret = __builtin_strcmp(_M_names[__i], _M_names[__i + 1]) == 0; 593 return __ret; 594 } 595 596 void 597 _M_replace_categories(const _Impl*, category); 598 599 void 600 _M_replace_category(const _Impl*, const locale::id* const*); 601 602 void 603 _M_replace_facet(const _Impl*, const locale::id*); 604 605 void 606 _M_install_facet(const locale::id*, const facet*); 607 608 template<typename _Facet> 609 void 610 _M_init_facet(_Facet* __facet) 611 { _M_install_facet(&_Facet::id, __facet); } 612 613 template<typename _Facet> 614 void 615 _M_init_facet_unchecked(_Facet* __facet) 616 { 617 __facet->_M_add_reference(); 618 _M_facets[_Facet::id._M_id()] = __facet; 619 } 620 621 void 622 _M_install_cache(const facet*, size_t); 623 624 void _M_init_extra(facet**); 625 void _M_init_extra(void*, void*, const char*, const char*); 626 }; 627 628 629 /** 630 * @brief Facet for localized string comparison. 631 * 632 * This facet encapsulates the code to compare strings in a localized 633 * manner. 634 * 635 * The collate template uses protected virtual functions to provide 636 * the actual results. The public accessors forward the call to 637 * the virtual functions. These virtual functions are hooks for 638 * developers to implement the behavior they require from the 639 * collate facet. 640 */ 641 template<typename _CharT> 642 class _GLIBCXX_NAMESPACE_CXX11 collate : public locale::facet 643 { 644 public: 645 // Types: 646 //@{ 647 /// Public typedefs 648 typedef _CharT char_type; 649 typedef basic_string<_CharT> string_type; 650 //@} 651 652 protected: 653 // Underlying "C" library locale information saved from 654 // initialization, needed by collate_byname as well. 655 __c_locale _M_c_locale_collate; 656 657 public: 658 /// Numpunct facet id. 659 static locale::id id; 660 661 /** 662 * @brief Constructor performs initialization. 663 * 664 * This is the constructor provided by the standard. 665 * 666 * @param __refs Passed to the base facet class. 667 */ 668 explicit 669 collate(size_t __refs = 0) 670 : facet(__refs), _M_c_locale_collate(_S_get_c_locale()) 671 { } 672 673 /** 674 * @brief Internal constructor. Not for general use. 675 * 676 * This is a constructor for use by the library itself to set up new 677 * locales. 678 * 679 * @param __cloc The C locale. 680 * @param __refs Passed to the base facet class. 681 */ 682 explicit 683 collate(__c_locale __cloc, size_t __refs = 0) 684 : facet(__refs), _M_c_locale_collate(_S_clone_c_locale(__cloc)) 685 { } 686 687 /** 688 * @brief Compare two strings. 689 * 690 * This function compares two strings and returns the result by calling 691 * collate::do_compare(). 692 * 693 * @param __lo1 Start of string 1. 694 * @param __hi1 End of string 1. 695 * @param __lo2 Start of string 2. 696 * @param __hi2 End of string 2. 697 * @return 1 if string1 > string2, -1 if string1 < string2, else 0. 698 */ 699 int 700 compare(const _CharT* __lo1, const _CharT* __hi1, 701 const _CharT* __lo2, const _CharT* __hi2) const 702 { return this->do_compare(__lo1, __hi1, __lo2, __hi2); } 703 704 /** 705 * @brief Transform string to comparable form. 706 * 707 * This function is a wrapper for strxfrm functionality. It takes the 708 * input string and returns a modified string that can be directly 709 * compared to other transformed strings. In the C locale, this 710 * function just returns a copy of the input string. In some other 711 * locales, it may replace two chars with one, change a char for 712 * another, etc. It does so by returning collate::do_transform(). 713 * 714 * @param __lo Start of string. 715 * @param __hi End of string. 716 * @return Transformed string_type. 717 */ 718 string_type 719 transform(const _CharT* __lo, const _CharT* __hi) const 720 { return this->do_transform(__lo, __hi); } 721 722 /** 723 * @brief Return hash of a string. 724 * 725 * This function computes and returns a hash on the input string. It 726 * does so by returning collate::do_hash(). 727 * 728 * @param __lo Start of string. 729 * @param __hi End of string. 730 * @return Hash value. 731 */ 732 long 733 hash(const _CharT* __lo, const _CharT* __hi) const 734 { return this->do_hash(__lo, __hi); } 735 736 // Used to abstract out _CharT bits in virtual member functions, below. 737 int 738 _M_compare(const _CharT*, const _CharT*) const throw(); 739 740 size_t 741 _M_transform(_CharT*, const _CharT*, size_t) const throw(); 742 743 protected: 744 /// Destructor. 745 virtual 746 ~collate() 747 { _S_destroy_c_locale(_M_c_locale_collate); } 748 749 /** 750 * @brief Compare two strings. 751 * 752 * This function is a hook for derived classes to change the value 753 * returned. @see compare(). 754 * 755 * @param __lo1 Start of string 1. 756 * @param __hi1 End of string 1. 757 * @param __lo2 Start of string 2. 758 * @param __hi2 End of string 2. 759 * @return 1 if string1 > string2, -1 if string1 < string2, else 0. 760 */ 761 virtual int 762 do_compare(const _CharT* __lo1, const _CharT* __hi1, 763 const _CharT* __lo2, const _CharT* __hi2) const; 764 765 /** 766 * @brief Transform string to comparable form. 767 * 768 * This function is a hook for derived classes to change the value 769 * returned. 770 * 771 * @param __lo Start. 772 * @param __hi End. 773 * @return transformed string. 774 */ 775 virtual string_type 776 do_transform(const _CharT* __lo, const _CharT* __hi) const; 777 778 /** 779 * @brief Return hash of a string. 780 * 781 * This function computes and returns a hash on the input string. This 782 * function is a hook for derived classes to change the value returned. 783 * 784 * @param __lo Start of string. 785 * @param __hi End of string. 786 * @return Hash value. 787 */ 788 virtual long 789 do_hash(const _CharT* __lo, const _CharT* __hi) const; 790 }; 791 792 template<typename _CharT> 793 locale::id collate<_CharT>::id; 794 795 // Specializations. 796 template<> 797 int 798 collate<char>::_M_compare(const char*, const char*) const throw(); 799 800 template<> 801 size_t 802 collate<char>::_M_transform(char*, const char*, size_t) const throw(); 803 804 #ifdef _GLIBCXX_USE_WCHAR_T 805 template<> 806 int 807 collate<wchar_t>::_M_compare(const wchar_t*, const wchar_t*) const throw(); 808 809 template<> 810 size_t 811 collate<wchar_t>::_M_transform(wchar_t*, const wchar_t*, size_t) const throw(); 812 #endif 813 814 /// class collate_byname [22.2.4.2]. 815 template<typename _CharT> 816 class _GLIBCXX_NAMESPACE_CXX11 collate_byname : public collate<_CharT> 817 { 818 public: 819 //@{ 820 /// Public typedefs 821 typedef _CharT char_type; 822 typedef basic_string<_CharT> string_type; 823 //@} 824 825 explicit 826 collate_byname(const char* __s, size_t __refs = 0) 827 : collate<_CharT>(__refs) 828 { 829 if (__builtin_strcmp(__s, "C") != 0 830 && __builtin_strcmp(__s, "POSIX") != 0) 831 { 832 this->_S_destroy_c_locale(this->_M_c_locale_collate); 833 this->_S_create_c_locale(this->_M_c_locale_collate, __s); 834 } 835 } 836 837 #if __cplusplus >= 201103L 838 explicit 839 collate_byname(const string& __s, size_t __refs = 0) 840 : collate_byname(__s.c_str(), __refs) { } 841 #endif 842 843 protected: 844 virtual 845 ~collate_byname() { } 846 }; 847 848 _GLIBCXX_END_NAMESPACE_VERSION 849 } // namespace 850 851 # include <bits/locale_classes.tcc> 852 853 #endif 854