Where Online Learning is simpler!
The C and C++ Include Header Files
/usr/include/c++/13/bits/locale_classes.h
$ cat -n /usr/include/c++/13/bits/locale_classes.h 1 // Locale support -*- C++ -*- 2 3 // Copyright (C) 1997-2023 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 _Facet> 86 friend const _Facet* 87 __try_use_facet(const locale&) _GLIBCXX_NOTHROW; 88 89 template<typename _Cache> 90 friend struct __use_cache; 91 92 ///@{ 93 /** 94 * @brief Category values. 95 * 96 * The standard category values are none, ctype, numeric, collate, time, 97 * monetary, and messages. They form a bitmask that supports union and 98 * intersection. The category all is the union of these values. 99 * 100 * NB: Order must match _S_facet_categories definition in locale.cc 101 */ 102 static const category none = 0; 103 static const category ctype = 1L << 0; 104 static const category numeric = 1L << 1; 105 static const category collate = 1L << 2; 106 static const category time = 1L << 3; 107 static const category monetary = 1L << 4; 108 static const category messages = 1L << 5; 109 static const category all = (ctype | numeric | collate | 110 time | monetary | messages); 111 ///@} 112 113 // Construct/copy/destroy: 114 115 /** 116 * @brief Default constructor. 117 * 118 * Constructs a copy of the global locale. If no locale has been 119 * explicitly set, this is the C locale. 120 */ 121 locale() throw(); 122 123 /** 124 * @brief Copy constructor. 125 * 126 * Constructs a copy of @a other. 127 * 128 * @param __other The locale to copy. 129 */ 130 locale(const locale& __other) throw(); 131 132 /** 133 * @brief Named locale constructor. 134 * 135 * Constructs a copy of the named C library locale. 136 * 137 * @param __s Name of the locale to construct. 138 * @throw std::runtime_error if __s is null or an undefined locale. 139 */ 140 explicit 141 locale(const char* __s); 142 143 /** 144 * @brief Construct locale with facets from another locale. 145 * 146 * Constructs a copy of the locale @a base. The facets specified by @a 147 * cat are replaced with those from the locale named by @a s. If base is 148 * named, this locale instance will also be named. 149 * 150 * @param __base The locale to copy. 151 * @param __s Name of the locale to use facets from. 152 * @param __cat Set of categories defining the facets to use from __s. 153 * @throw std::runtime_error if __s is null or an undefined locale. 154 */ 155 locale(const locale& __base, const char* __s, category __cat); 156 157 #if __cplusplus >= 201103L 158 /** 159 * @brief Named locale constructor. 160 * 161 * Constructs a copy of the named C library locale. 162 * 163 * @param __s Name of the locale to construct. 164 * @throw std::runtime_error if __s is an undefined locale. 165 */ 166 explicit 167 locale(const std::string& __s) : locale(__s.c_str()) { } 168 169 /** 170 * @brief Construct locale with facets from another locale. 171 * 172 * Constructs a copy of the locale @a base. The facets specified by @a 173 * cat are replaced with those from the locale named by @a s. If base is 174 * named, this locale instance will also be named. 175 * 176 * @param __base The locale to copy. 177 * @param __s Name of the locale to use facets from. 178 * @param __cat Set of categories defining the facets to use from __s. 179 * @throw std::runtime_error if __s is an undefined locale. 180 */ 181 locale(const locale& __base, const std::string& __s, category __cat) 182 : locale(__base, __s.c_str(), __cat) { } 183 #endif 184 185 /** 186 * @brief Construct locale with facets from another locale. 187 * 188 * Constructs a copy of the locale @a base. The facets specified by @a 189 * cat are replaced with those from the locale @a add. If @a base and @a 190 * add are named, this locale instance will also be named. 191 * 192 * @param __base The locale to copy. 193 * @param __add The locale to use facets from. 194 * @param __cat Set of categories defining the facets to use from add. 195 */ 196 locale(const locale& __base, const locale& __add, category __cat); 197 198 /** 199 * @brief Construct locale with another facet. 200 * 201 * Constructs a copy of the locale @a __other. The facet @a __f 202 * is added to @a __other, replacing an existing facet of type 203 * Facet if there is one. If @a __f is null, this locale is a 204 * copy of @a __other. 205 * 206 * @param __other The locale to copy. 207 * @param __f The facet to add in. 208 */ 209 template<typename _Facet> 210 locale(const locale& __other, _Facet* __f); 211 212 /// Locale destructor. 213 ~locale() throw(); 214 215 /** 216 * @brief Assignment operator. 217 * 218 * Set this locale to be a copy of @a other. 219 * 220 * @param __other The locale to copy. 221 * @return A reference to this locale. 222 */ 223 const locale& 224 operator=(const locale& __other) throw(); 225 226 /** 227 * @brief Construct locale with another facet. 228 * 229 * Constructs and returns a new copy of this locale. Adds or replaces an 230 * existing facet of type Facet from the locale @a other into the new 231 * locale. 232 * 233 * @tparam _Facet The facet type to copy from other 234 * @param __other The locale to copy from. 235 * @return Newly constructed locale. 236 * @throw std::runtime_error if __other has no facet of type _Facet. 237 */ 238 template<typename _Facet> 239 locale 240 combine(const locale& __other) const; 241 242 // Locale operations: 243 /** 244 * @brief Return locale name. 245 * @return Locale name or "*" if unnamed. 246 */ 247 _GLIBCXX_DEFAULT_ABI_TAG 248 string 249 name() const; 250 251 /** 252 * @brief Locale equality. 253 * 254 * @param __other The locale to compare against. 255 * @return True if other and this refer to the same locale instance, are 256 * copies, or have the same name. False otherwise. 257 */ 258 bool 259 operator==(const locale& __other) const throw(); 260 261 #if __cpp_impl_three_way_comparison < 201907L 262 /** 263 * @brief Locale inequality. 264 * 265 * @param __other The locale to compare against. 266 * @return ! (*this == __other) 267 */ 268 bool 269 operator!=(const locale& __other) const throw() 270 { return !(this->operator==(__other)); } 271 #endif 272 273 /** 274 * @brief Compare two strings according to collate. 275 * 276 * Template operator to compare two strings using the compare function of 277 * the collate facet in this locale. One use is to provide the locale to 278 * the sort function. For example, a vector v of strings could be sorted 279 * according to locale loc by doing: 280 * @code 281 * std::sort(v.begin(), v.end(), loc); 282 * @endcode 283 * 284 * @param __s1 First string to compare. 285 * @param __s2 Second string to compare. 286 * @return True if collate<_Char> facet compares __s1 < __s2, else false. 287 */ 288 template<typename _Char, typename _Traits, typename _Alloc> 289 bool 290 operator()(const basic_string<_Char, _Traits, _Alloc>& __s1, 291 const basic_string<_Char, _Traits, _Alloc>& __s2) const; 292 293 // Global locale objects: 294 /** 295 * @brief Set global locale 296 * 297 * This function sets the global locale to the argument and returns a 298 * copy of the previous global locale. If the argument has a name, it 299 * will also call std::setlocale(LC_ALL, loc.name()). 300 * 301 * @param __loc The new locale to make global. 302 * @return Copy of the old global locale. 303 */ 304 static locale 305 global(const locale& __loc); 306 307 /** 308 * @brief Return reference to the C locale. 309 */ 310 static const locale& 311 classic(); 312 313 private: 314 // The (shared) implementation 315 _Impl* _M_impl; 316 317 // The "C" reference locale 318 static _Impl* _S_classic; 319 320 // Current global locale 321 static _Impl* _S_global; 322 323 // Names of underlying locale categories. 324 // NB: locale::global() has to know how to modify all the 325 // underlying categories, not just the ones required by the C++ 326 // standard. 327 static const char* const* const _S_categories; 328 329 // Number of standard categories. For C++, these categories are 330 // collate, ctype, monetary, numeric, time, and messages. These 331 // directly correspond to ISO C99 macros LC_COLLATE, LC_CTYPE, 332 // LC_MONETARY, LC_NUMERIC, and LC_TIME. In addition, POSIX (IEEE 333 // 1003.1-2001) specifies LC_MESSAGES. 334 // In addition to the standard categories, the underlying 335 // operating system is allowed to define extra LC_* 336 // macros. For GNU systems, the following are also valid: 337 // LC_PAPER, LC_NAME, LC_ADDRESS, LC_TELEPHONE, LC_MEASUREMENT, 338 // and LC_IDENTIFICATION. 339 enum { _S_categories_size = 6 + _GLIBCXX_NUM_CATEGORIES }; 340 341 #ifdef __GTHREADS 342 static __gthread_once_t _S_once; 343 #endif 344 345 explicit 346 locale(_Impl*) throw(); 347 348 static void 349 _S_initialize(); 350 351 static void 352 _S_initialize_once() throw(); 353 354 static category 355 _S_normalize_category(category); 356 357 void 358 _M_coalesce(const locale& __base, const locale& __add, category __cat); 359 360 #if _GLIBCXX_USE_CXX11_ABI 361 static const id* const _S_twinned_facets[]; 362 #endif 363 }; 364 365 366 // 22.1.1.1.2 Class locale::facet 367 /** 368 * @brief Localization functionality base class. 369 * @ingroup locales 370 * 371 * The facet class is the base class for a localization feature, such as 372 * money, time, and number printing. It provides common support for facets 373 * and reference management. 374 * 375 * Facets may not be copied or assigned. 376 */ 377 class locale::facet 378 { 379 private: 380 friend class locale; 381 friend class locale::_Impl; 382 383 mutable _Atomic_word _M_refcount; 384 385 // Contains data from the underlying "C" library for the classic locale. 386 static __c_locale _S_c_locale; 387 388 // String literal for the name of the classic locale. 389 static const char _S_c_name[2]; 390 391 #ifdef __GTHREADS 392 static __gthread_once_t _S_once; 393 #endif 394 395 static void 396 _S_initialize_once(); 397 398 protected: 399 /** 400 * @brief Facet constructor. 401 * 402 * This is the constructor provided by the standard. If refs is 0, the 403 * facet is destroyed when the last referencing locale is destroyed. 404 * Otherwise the facet will never be destroyed. 405 * 406 * @param __refs The initial value for reference count. 407 */ 408 explicit 409 facet(size_t __refs = 0) throw() : _M_refcount(__refs ? 1 : 0) 410 { } 411 412 /// Facet destructor. 413 virtual 414 ~facet(); 415 416 static void 417 _S_create_c_locale(__c_locale& __cloc, const char* __s, 418 __c_locale __old = 0); 419 420 static __c_locale 421 _S_clone_c_locale(__c_locale& __cloc) throw(); 422 423 static void 424 _S_destroy_c_locale(__c_locale& __cloc); 425 426 static __c_locale 427 _S_lc_ctype_c_locale(__c_locale __cloc, const char* __s); 428 429 // Returns data from the underlying "C" library data for the 430 // classic locale. 431 static __c_locale 432 _S_get_c_locale(); 433 434 _GLIBCXX_CONST static const char* 435 _S_get_c_name() throw(); 436 437 #if __cplusplus < 201103L 438 private: 439 facet(const facet&); // Not defined. 440 441 facet& 442 operator=(const facet&); // Not defined. 443 #else 444 facet(const facet&) = delete; 445 446 facet& 447 operator=(const facet&) = delete; 448 #endif 449 450 private: 451 void 452 _M_add_reference() const throw() 453 { __gnu_cxx::__atomic_add_dispatch(&_M_refcount, 1); } 454 455 void 456 _M_remove_reference() const throw() 457 { 458 // Be race-detector-friendly. For more info see bits/c++config. 459 _GLIBCXX_SYNCHRONIZATION_HAPPENS_BEFORE(&_M_refcount); 460 if (__gnu_cxx::__exchange_and_add_dispatch(&_M_refcount, -1) == 1) 461 { 462 _GLIBCXX_SYNCHRONIZATION_HAPPENS_AFTER(&_M_refcount); 463 __try 464 { delete this; } 465 __catch(...) 466 { } 467 } 468 } 469 470 const facet* _M_sso_shim(const id*) const; 471 const facet* _M_cow_shim(const id*) const; 472 473 protected: 474 class __shim; // For internal use only. 475 }; 476 477 478 // 22.1.1.1.3 Class locale::id 479 /** 480 * @brief Facet ID class. 481 * @ingroup locales 482 * 483 * The ID class provides facets with an index used to identify them. 484 * Every facet class must define a public static member locale::id, or be 485 * derived from a facet that provides this member, otherwise the facet 486 * cannot be used in a locale. The locale::id ensures that each class 487 * type gets a unique identifier. 488 */ 489 class locale::id 490 { 491 private: 492 friend class locale; 493 friend class locale::_Impl; 494 495 template<typename _Facet> 496 friend const _Facet& 497 use_facet(const locale&); 498 499 template<typename _Facet> 500 friend bool 501 has_facet(const locale&) throw(); 502 503 template<typename _Facet> 504 friend const _Facet* 505 __try_use_facet(const locale&) _GLIBCXX_NOTHROW; 506 507 // NB: There is no accessor for _M_index because it may be used 508 // before the constructor is run; the effect of calling a member 509 // function (even an inline) would be undefined. 510 mutable size_t _M_index; 511 512 // Last id number assigned. 513 static _Atomic_word _S_refcount; 514 515 void 516 operator=(const id&); // Not defined. 517 518 id(const id&); // Not defined. 519 520 public: 521 // NB: This class is always a static data member, and thus can be 522 // counted on to be zero-initialized. 523 /// Constructor. 524 id() { } 525 526 size_t 527 _M_id() const throw(); 528 }; 529 530 531 // Implementation object for locale. 532 class locale::_Impl 533 { 534 public: 535 // Friends. 536 friend class locale; 537 friend class locale::facet; 538 539 template<typename _Facet> 540 friend bool 541 has_facet(const locale&) throw(); 542 543 template<typename _Facet> 544 friend const _Facet& 545 use_facet(const locale&); 546 547 template<typename _Facet> 548 friend const _Facet* 549 __try_use_facet(const locale&) _GLIBCXX_NOTHROW; 550 551 template<typename _Cache> 552 friend struct __use_cache; 553 554 private: 555 // Data Members. 556 _Atomic_word _M_refcount; 557 const facet** _M_facets; 558 size_t _M_facets_size; 559 const facet** _M_caches; 560 char** _M_names; 561 static const locale::id* const _S_id_ctype[]; 562 static const locale::id* const _S_id_numeric[]; 563 static const locale::id* const _S_id_collate[]; 564 static const locale::id* const _S_id_time[]; 565 static const locale::id* const _S_id_monetary[]; 566 static const locale::id* const _S_id_messages[]; 567 static const locale::id* const* const _S_facet_categories[]; 568 569 void 570 _M_add_reference() throw() 571 { __gnu_cxx::__atomic_add_dispatch(&_M_refcount, 1); } 572 573 void 574 _M_remove_reference() throw() 575 { 576 // Be race-detector-friendly. For more info see bits/c++config. 577 _GLIBCXX_SYNCHRONIZATION_HAPPENS_BEFORE(&_M_refcount); 578 if (__gnu_cxx::__exchange_and_add_dispatch(&_M_refcount, -1) == 1) 579 { 580 _GLIBCXX_SYNCHRONIZATION_HAPPENS_AFTER(&_M_refcount); 581 __try 582 { delete this; } 583 __catch(...) 584 { } 585 } 586 } 587 588 _Impl(const _Impl&, size_t); 589 _Impl(const char*, size_t); 590 _Impl(size_t) throw(); 591 592 ~_Impl() throw(); 593 594 _Impl(const _Impl&); // Not defined. 595 596 void 597 operator=(const _Impl&); // Not defined. 598 599 bool 600 _M_check_same_name() 601 { 602 bool __ret = true; 603 if (_M_names[1]) 604 // We must actually compare all the _M_names: can be all equal! 605 for (size_t __i = 0; __ret && __i < _S_categories_size - 1; ++__i) 606 __ret = __builtin_strcmp(_M_names[__i], _M_names[__i + 1]) == 0; 607 return __ret; 608 } 609 610 void 611 _M_replace_categories(const _Impl*, category); 612 613 void 614 _M_replace_category(const _Impl*, const locale::id* const*); 615 616 void 617 _M_replace_facet(const _Impl*, const locale::id*); 618 619 void 620 _M_install_facet(const locale::id*, const facet*); 621 622 template<typename _Facet> 623 void 624 _M_init_facet(_Facet* __facet) 625 { _M_install_facet(&_Facet::id, __facet); } 626 627 template<typename _Facet> 628 void 629 _M_init_facet_unchecked(_Facet* __facet) 630 { 631 __facet->_M_add_reference(); 632 _M_facets[_Facet::id._M_id()] = __facet; 633 } 634 635 void 636 _M_install_cache(const facet*, size_t); 637 638 void _M_init_extra(facet**); 639 void _M_init_extra(void*, void*, const char*, const char*); 640 641 #ifdef _GLIBCXX_LONG_DOUBLE_ALT128_COMPAT 642 void _M_init_extra_ldbl128(bool); 643 #endif 644 }; 645 646 647 /** 648 * @brief Facet for localized string comparison. 649 * 650 * This facet encapsulates the code to compare strings in a localized 651 * manner. 652 * 653 * The collate template uses protected virtual functions to provide 654 * the actual results. The public accessors forward the call to 655 * the virtual functions. These virtual functions are hooks for 656 * developers to implement the behavior they require from the 657 * collate facet. 658 */ 659 template<typename _CharT> 660 class _GLIBCXX_NAMESPACE_CXX11 collate : public locale::facet 661 { 662 public: 663 // Types: 664 ///@{ 665 /// Public typedefs 666 typedef _CharT char_type; 667 typedef basic_string<_CharT> string_type; 668 ///@} 669 670 protected: 671 // Underlying "C" library locale information saved from 672 // initialization, needed by collate_byname as well. 673 __c_locale _M_c_locale_collate; 674 675 public: 676 /// Numpunct facet id. 677 static locale::id id; 678 679 /** 680 * @brief Constructor performs initialization. 681 * 682 * This is the constructor provided by the standard. 683 * 684 * @param __refs Passed to the base facet class. 685 */ 686 explicit 687 collate(size_t __refs = 0) 688 : facet(__refs), _M_c_locale_collate(_S_get_c_locale()) 689 { } 690 691 /** 692 * @brief Internal constructor. Not for general use. 693 * 694 * This is a constructor for use by the library itself to set up new 695 * locales. 696 * 697 * @param __cloc The C locale. 698 * @param __refs Passed to the base facet class. 699 */ 700 explicit 701 collate(__c_locale __cloc, size_t __refs = 0) 702 : facet(__refs), _M_c_locale_collate(_S_clone_c_locale(__cloc)) 703 { } 704 705 /** 706 * @brief Compare two strings. 707 * 708 * This function compares two strings and returns the result by calling 709 * collate::do_compare(). 710 * 711 * @param __lo1 Start of string 1. 712 * @param __hi1 End of string 1. 713 * @param __lo2 Start of string 2. 714 * @param __hi2 End of string 2. 715 * @return 1 if string1 > string2, -1 if string1 < string2, else 0. 716 */ 717 int 718 compare(const _CharT* __lo1, const _CharT* __hi1, 719 const _CharT* __lo2, const _CharT* __hi2) const 720 { return this->do_compare(__lo1, __hi1, __lo2, __hi2); } 721 722 /** 723 * @brief Transform string to comparable form. 724 * 725 * This function is a wrapper for strxfrm functionality. It takes the 726 * input string and returns a modified string that can be directly 727 * compared to other transformed strings. In the C locale, this 728 * function just returns a copy of the input string. In some other 729 * locales, it may replace two chars with one, change a char for 730 * another, etc. It does so by returning collate::do_transform(). 731 * 732 * @param __lo Start of string. 733 * @param __hi End of string. 734 * @return Transformed string_type. 735 */ 736 string_type 737 transform(const _CharT* __lo, const _CharT* __hi) const 738 { return this->do_transform(__lo, __hi); } 739 740 /** 741 * @brief Return hash of a string. 742 * 743 * This function computes and returns a hash on the input string. It 744 * does so by returning collate::do_hash(). 745 * 746 * @param __lo Start of string. 747 * @param __hi End of string. 748 * @return Hash value. 749 */ 750 long 751 hash(const _CharT* __lo, const _CharT* __hi) const 752 { return this->do_hash(__lo, __hi); } 753 754 // Used to abstract out _CharT bits in virtual member functions, below. 755 int 756 _M_compare(const _CharT*, const _CharT*) const throw(); 757 758 size_t 759 _M_transform(_CharT*, const _CharT*, size_t) const throw(); 760 761 protected: 762 /// Destructor. 763 virtual 764 ~collate() 765 { _S_destroy_c_locale(_M_c_locale_collate); } 766 767 /** 768 * @brief Compare two strings. 769 * 770 * This function is a hook for derived classes to change the value 771 * returned. @see compare(). 772 * 773 * @param __lo1 Start of string 1. 774 * @param __hi1 End of string 1. 775 * @param __lo2 Start of string 2. 776 * @param __hi2 End of string 2. 777 * @return 1 if string1 > string2, -1 if string1 < string2, else 0. 778 */ 779 virtual int 780 do_compare(const _CharT* __lo1, const _CharT* __hi1, 781 const _CharT* __lo2, const _CharT* __hi2) const; 782 783 /** 784 * @brief Transform string to comparable form. 785 * 786 * This function is a hook for derived classes to change the value 787 * returned. 788 * 789 * @param __lo Start. 790 * @param __hi End. 791 * @return transformed string. 792 */ 793 virtual string_type 794 do_transform(const _CharT* __lo, const _CharT* __hi) const; 795 796 /** 797 * @brief Return hash of a string. 798 * 799 * This function computes and returns a hash on the input string. This 800 * function is a hook for derived classes to change the value returned. 801 * 802 * @param __lo Start of string. 803 * @param __hi End of string. 804 * @return Hash value. 805 */ 806 virtual long 807 do_hash(const _CharT* __lo, const _CharT* __hi) const; 808 }; 809 810 template<typename _CharT> 811 locale::id collate<_CharT>::id; 812 813 // Specializations. 814 template<> 815 int 816 collate<char>::_M_compare(const char*, const char*) const throw(); 817 818 template<> 819 size_t 820 collate<char>::_M_transform(char*, const char*, size_t) const throw(); 821 822 #ifdef _GLIBCXX_USE_WCHAR_T 823 template<> 824 int 825 collate<wchar_t>::_M_compare(const wchar_t*, const wchar_t*) const throw(); 826 827 template<> 828 size_t 829 collate<wchar_t>::_M_transform(wchar_t*, const wchar_t*, size_t) const throw(); 830 #endif 831 832 /// class collate_byname [22.2.4.2]. 833 template<typename _CharT> 834 class _GLIBCXX_NAMESPACE_CXX11 collate_byname : public collate<_CharT> 835 { 836 public: 837 ///@{ 838 /// Public typedefs 839 typedef _CharT char_type; 840 typedef basic_string<_CharT> string_type; 841 ///@} 842 843 explicit 844 collate_byname(const char* __s, size_t __refs = 0) 845 : collate<_CharT>(__refs) 846 { 847 if (__builtin_strcmp(__s, "C") != 0 848 && __builtin_strcmp(__s, "POSIX") != 0) 849 { 850 this->_S_destroy_c_locale(this->_M_c_locale_collate); 851 this->_S_create_c_locale(this->_M_c_locale_collate, __s); 852 } 853 } 854 855 #if __cplusplus >= 201103L 856 explicit 857 collate_byname(const string& __s, size_t __refs = 0) 858 : collate_byname(__s.c_str(), __refs) { } 859 #endif 860 861 protected: 862 virtual 863 ~collate_byname() { } 864 }; 865 866 _GLIBCXX_END_NAMESPACE_VERSION 867 } // namespace 868 869 # include <bits/locale_classes.tcc> 870 871 #endif
Contact us
|
About us
|
Term of use
|
Copyright © 2000-2025 MyWebUniversity.com ™
