libstdc++
locale_classes.h
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1 // Locale support -*- C++ -*-
2 
3 // Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
4 // 2006, 2007, 2008, 2009, 2010, 2011
5 // Free Software Foundation, Inc.
6 //
7 // This file is part of the GNU ISO C++ Library. This library is free
8 // software; you can redistribute it and/or modify it under the
9 // terms of the GNU General Public License as published by the
10 // Free Software Foundation; either version 3, or (at your option)
11 // any later version.
12 
13 // This library is distributed in the hope that it will be useful,
14 // but WITHOUT ANY WARRANTY; without even the implied warranty of
15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 // GNU General Public License for more details.
17 
18 // Under Section 7 of GPL version 3, you are granted additional
19 // permissions described in the GCC Runtime Library Exception, version
20 // 3.1, as published by the Free Software Foundation.
21 
22 // You should have received a copy of the GNU General Public License and
23 // a copy of the GCC Runtime Library Exception along with this program;
24 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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26 
27 /** @file bits/locale_classes.h
28  * This is an internal header file, included by other library headers.
29  * Do not attempt to use it directly. @headername{locale}
30  */
31 
32 //
33 // ISO C++ 14882: 22.1 Locales
34 //
35 
36 #ifndef _LOCALE_CLASSES_H
37 #define _LOCALE_CLASSES_H 1
38 
39 #pragma GCC system_header
40 
41 #include <bits/localefwd.h>
42 #include <string>
43 #include <ext/atomicity.h>
44 
45 namespace std _GLIBCXX_VISIBILITY(default)
46 {
47 _GLIBCXX_BEGIN_NAMESPACE_VERSION
48 
49  // 22.1.1 Class locale
50  /**
51  * @brief Container class for localization functionality.
52  * @ingroup locales
53  *
54  * The locale class is first a class wrapper for C library locales. It is
55  * also an extensible container for user-defined localization. A locale is
56  * a collection of facets that implement various localization features such
57  * as money, time, and number printing.
58  *
59  * Constructing C++ locales does not change the C library locale.
60  *
61  * This library supports efficient construction and copying of locales
62  * through a reference counting implementation of the locale class.
63  */
64  class locale
65  {
66  public:
67  // Types:
68  /// Definition of locale::category.
69  typedef int category;
70 
71  // Forward decls and friends:
72  class facet;
73  class id;
74  class _Impl;
75 
76  friend class facet;
77  friend class _Impl;
78 
79  template<typename _Facet>
80  friend bool
81  has_facet(const locale&) throw();
82 
83  template<typename _Facet>
84  friend const _Facet&
85  use_facet(const locale&);
86 
87  template<typename _Cache>
88  friend struct __use_cache;
89 
90  //@{
91  /**
92  * @brief Category values.
93  *
94  * The standard category values are none, ctype, numeric, collate, time,
95  * monetary, and messages. They form a bitmask that supports union and
96  * intersection. The category all is the union of these values.
97  *
98  * NB: Order must match _S_facet_categories definition in locale.cc
99  */
100  static const category none = 0;
101  static const category ctype = 1L << 0;
102  static const category numeric = 1L << 1;
103  static const category collate = 1L << 2;
104  static const category time = 1L << 3;
105  static const category monetary = 1L << 4;
106  static const category messages = 1L << 5;
107  static const category all = (ctype | numeric | collate |
108  time | monetary | messages);
109  //@}
110 
111  // Construct/copy/destroy:
112 
113  /**
114  * @brief Default constructor.
115  *
116  * Constructs a copy of the global locale. If no locale has been
117  * explicitly set, this is the C locale.
118  */
119  locale() throw();
120 
121  /**
122  * @brief Copy constructor.
123  *
124  * Constructs a copy of @a other.
125  *
126  * @param __other The locale to copy.
127  */
128  locale(const locale& __other) throw();
129 
130  /**
131  * @brief Named locale constructor.
132  *
133  * Constructs a copy of the named C library locale.
134  *
135  * @param __s Name of the locale to construct.
136  * @throw std::runtime_error if __s is null or an undefined locale.
137  */
138  explicit
139  locale(const char* __s);
140 
141  /**
142  * @brief Construct locale with facets from another locale.
143  *
144  * Constructs a copy of the locale @a base. The facets specified by @a
145  * cat are replaced with those from the locale named by @a s. If base is
146  * named, this locale instance will also be named.
147  *
148  * @param __base The locale to copy.
149  * @param __s Name of the locale to use facets from.
150  * @param __cat Set of categories defining the facets to use from __s.
151  * @throw std::runtime_error if __s is null or an undefined locale.
152  */
153  locale(const locale& __base, const char* __s, category __cat);
154 
155  /**
156  * @brief Construct locale with facets from another locale.
157  *
158  * Constructs a copy of the locale @a base. The facets specified by @a
159  * cat are replaced with those from the locale @a add. If @a base and @a
160  * add are named, this locale instance will also be named.
161  *
162  * @param __base The locale to copy.
163  * @param __add The locale to use facets from.
164  * @param __cat Set of categories defining the facets to use from add.
165  */
166  locale(const locale& __base, const locale& __add, category __cat);
167 
168  /**
169  * @brief Construct locale with another facet.
170  *
171  * Constructs a copy of the locale @a __other. The facet @a __f
172  * is added to @a __other, replacing an existing facet of type
173  * Facet if there is one. If @a __f is null, this locale is a
174  * copy of @a __other.
175  *
176  * @param __other The locale to copy.
177  * @param __f The facet to add in.
178  */
179  template<typename _Facet>
180  locale(const locale& __other, _Facet* __f);
181 
182  /// Locale destructor.
183  ~locale() throw();
184 
185  /**
186  * @brief Assignment operator.
187  *
188  * Set this locale to be a copy of @a other.
189  *
190  * @param __other The locale to copy.
191  * @return A reference to this locale.
192  */
193  const locale&
194  operator=(const locale& __other) throw();
195 
196  /**
197  * @brief Construct locale with another facet.
198  *
199  * Constructs and returns a new copy of this locale. Adds or replaces an
200  * existing facet of type Facet from the locale @a other into the new
201  * locale.
202  *
203  * @tparam _Facet The facet type to copy from other
204  * @param __other The locale to copy from.
205  * @return Newly constructed locale.
206  * @throw std::runtime_error if __other has no facet of type _Facet.
207  */
208  template<typename _Facet>
209  locale
210  combine(const locale& __other) const;
211 
212  // Locale operations:
213  /**
214  * @brief Return locale name.
215  * @return Locale name or "*" if unnamed.
216  */
217  string
218  name() const;
219 
220  /**
221  * @brief Locale equality.
222  *
223  * @param __other The locale to compare against.
224  * @return True if other and this refer to the same locale instance, are
225  * copies, or have the same name. False otherwise.
226  */
227  bool
228  operator==(const locale& __other) const throw();
229 
230  /**
231  * @brief Locale inequality.
232  *
233  * @param __other The locale to compare against.
234  * @return ! (*this == __other)
235  */
236  bool
237  operator!=(const locale& __other) const throw()
238  { return !(this->operator==(__other)); }
239 
240  /**
241  * @brief Compare two strings according to collate.
242  *
243  * Template operator to compare two strings using the compare function of
244  * the collate facet in this locale. One use is to provide the locale to
245  * the sort function. For example, a vector v of strings could be sorted
246  * according to locale loc by doing:
247  * @code
248  * std::sort(v.begin(), v.end(), loc);
249  * @endcode
250  *
251  * @param __s1 First string to compare.
252  * @param __s2 Second string to compare.
253  * @return True if collate<_Char> facet compares __s1 < __s2, else false.
254  */
255  template<typename _Char, typename _Traits, typename _Alloc>
256  bool
258  const basic_string<_Char, _Traits, _Alloc>& __s2) const;
259 
260  // Global locale objects:
261  /**
262  * @brief Set global locale
263  *
264  * This function sets the global locale to the argument and returns a
265  * copy of the previous global locale. If the argument has a name, it
266  * will also call std::setlocale(LC_ALL, loc.name()).
267  *
268  * @param __loc The new locale to make global.
269  * @return Copy of the old global locale.
270  */
271  static locale
272  global(const locale& __loc);
273 
274  /**
275  * @brief Return reference to the C locale.
276  */
277  static const locale&
278  classic();
279 
280  private:
281  // The (shared) implementation
282  _Impl* _M_impl;
283 
284  // The "C" reference locale
285  static _Impl* _S_classic;
286 
287  // Current global locale
288  static _Impl* _S_global;
289 
290  // Names of underlying locale categories.
291  // NB: locale::global() has to know how to modify all the
292  // underlying categories, not just the ones required by the C++
293  // standard.
294  static const char* const* const _S_categories;
295 
296  // Number of standard categories. For C++, these categories are
297  // collate, ctype, monetary, numeric, time, and messages. These
298  // directly correspond to ISO C99 macros LC_COLLATE, LC_CTYPE,
299  // LC_MONETARY, LC_NUMERIC, and LC_TIME. In addition, POSIX (IEEE
300  // 1003.1-2001) specifies LC_MESSAGES.
301  // In addition to the standard categories, the underlying
302  // operating system is allowed to define extra LC_*
303  // macros. For GNU systems, the following are also valid:
304  // LC_PAPER, LC_NAME, LC_ADDRESS, LC_TELEPHONE, LC_MEASUREMENT,
305  // and LC_IDENTIFICATION.
306  enum { _S_categories_size = 6 + _GLIBCXX_NUM_CATEGORIES };
307 
308 #ifdef __GTHREADS
309  static __gthread_once_t _S_once;
310 #endif
311 
312  explicit
313  locale(_Impl*) throw();
314 
315  static void
316  _S_initialize();
317 
318  static void
319  _S_initialize_once() throw();
320 
321  static category
322  _S_normalize_category(category);
323 
324  void
325  _M_coalesce(const locale& __base, const locale& __add, category __cat);
326  };
327 
328 
329  // 22.1.1.1.2 Class locale::facet
330  /**
331  * @brief Localization functionality base class.
332  * @ingroup locales
333  *
334  * The facet class is the base class for a localization feature, such as
335  * money, time, and number printing. It provides common support for facets
336  * and reference management.
337  *
338  * Facets may not be copied or assigned.
339  */
340  class locale::facet
341  {
342  private:
343  friend class locale;
344  friend class locale::_Impl;
345 
346  mutable _Atomic_word _M_refcount;
347 
348  // Contains data from the underlying "C" library for the classic locale.
349  static __c_locale _S_c_locale;
350 
351  // String literal for the name of the classic locale.
352  static const char _S_c_name[2];
353 
354 #ifdef __GTHREADS
355  static __gthread_once_t _S_once;
356 #endif
357 
358  static void
359  _S_initialize_once();
360 
361  protected:
362  /**
363  * @brief Facet constructor.
364  *
365  * This is the constructor provided by the standard. If refs is 0, the
366  * facet is destroyed when the last referencing locale is destroyed.
367  * Otherwise the facet will never be destroyed.
368  *
369  * @param __refs The initial value for reference count.
370  */
371  explicit
372  facet(size_t __refs = 0) throw() : _M_refcount(__refs ? 1 : 0)
373  { }
374 
375  /// Facet destructor.
376  virtual
377  ~facet();
378 
379  static void
380  _S_create_c_locale(__c_locale& __cloc, const char* __s,
381  __c_locale __old = 0);
382 
383  static __c_locale
384  _S_clone_c_locale(__c_locale& __cloc) throw();
385 
386  static void
387  _S_destroy_c_locale(__c_locale& __cloc);
388 
389  static __c_locale
390  _S_lc_ctype_c_locale(__c_locale __cloc, const char* __s);
391 
392  // Returns data from the underlying "C" library data for the
393  // classic locale.
394  static __c_locale
395  _S_get_c_locale();
396 
397  _GLIBCXX_CONST static const char*
398  _S_get_c_name() throw();
399 
400  private:
401  void
402  _M_add_reference() const throw()
403  { __gnu_cxx::__atomic_add_dispatch(&_M_refcount, 1); }
404 
405  void
406  _M_remove_reference() const throw()
407  {
408  // Be race-detector-friendly. For more info see bits/c++config.
409  _GLIBCXX_SYNCHRONIZATION_HAPPENS_BEFORE(&_M_refcount);
410  if (__gnu_cxx::__exchange_and_add_dispatch(&_M_refcount, -1) == 1)
411  {
412  _GLIBCXX_SYNCHRONIZATION_HAPPENS_AFTER(&_M_refcount);
413  __try
414  { delete this; }
415  __catch(...)
416  { }
417  }
418  }
419 
420  facet(const facet&); // Not defined.
421 
422  facet&
423  operator=(const facet&); // Not defined.
424  };
425 
426 
427  // 22.1.1.1.3 Class locale::id
428  /**
429  * @brief Facet ID class.
430  * @ingroup locales
431  *
432  * The ID class provides facets with an index used to identify them.
433  * Every facet class must define a public static member locale::id, or be
434  * derived from a facet that provides this member, otherwise the facet
435  * cannot be used in a locale. The locale::id ensures that each class
436  * type gets a unique identifier.
437  */
439  {
440  private:
441  friend class locale;
442  friend class locale::_Impl;
443 
444  template<typename _Facet>
445  friend const _Facet&
446  use_facet(const locale&);
447 
448  template<typename _Facet>
449  friend bool
450  has_facet(const locale&) throw();
451 
452  // NB: There is no accessor for _M_index because it may be used
453  // before the constructor is run; the effect of calling a member
454  // function (even an inline) would be undefined.
455  mutable size_t _M_index;
456 
457  // Last id number assigned.
458  static _Atomic_word _S_refcount;
459 
460  void
461  operator=(const id&); // Not defined.
462 
463  id(const id&); // Not defined.
464 
465  public:
466  // NB: This class is always a static data member, and thus can be
467  // counted on to be zero-initialized.
468  /// Constructor.
469  id() { }
470 
471  size_t
472  _M_id() const throw();
473  };
474 
475 
476  // Implementation object for locale.
477  class locale::_Impl
478  {
479  public:
480  // Friends.
481  friend class locale;
482  friend class locale::facet;
483 
484  template<typename _Facet>
485  friend bool
486  has_facet(const locale&) throw();
487 
488  template<typename _Facet>
489  friend const _Facet&
490  use_facet(const locale&);
491 
492  template<typename _Cache>
493  friend struct __use_cache;
494 
495  private:
496  // Data Members.
497  _Atomic_word _M_refcount;
498  const facet** _M_facets;
499  size_t _M_facets_size;
500  const facet** _M_caches;
501  char** _M_names;
502  static const locale::id* const _S_id_ctype[];
503  static const locale::id* const _S_id_numeric[];
504  static const locale::id* const _S_id_collate[];
505  static const locale::id* const _S_id_time[];
506  static const locale::id* const _S_id_monetary[];
507  static const locale::id* const _S_id_messages[];
508  static const locale::id* const* const _S_facet_categories[];
509 
510  void
511  _M_add_reference() throw()
512  { __gnu_cxx::__atomic_add_dispatch(&_M_refcount, 1); }
513 
514  void
515  _M_remove_reference() throw()
516  {
517  // Be race-detector-friendly. For more info see bits/c++config.
518  _GLIBCXX_SYNCHRONIZATION_HAPPENS_BEFORE(&_M_refcount);
519  if (__gnu_cxx::__exchange_and_add_dispatch(&_M_refcount, -1) == 1)
520  {
521  _GLIBCXX_SYNCHRONIZATION_HAPPENS_AFTER(&_M_refcount);
522  __try
523  { delete this; }
524  __catch(...)
525  { }
526  }
527  }
528 
529  _Impl(const _Impl&, size_t);
530  _Impl(const char*, size_t);
531  _Impl(size_t) throw();
532 
533  ~_Impl() throw();
534 
535  _Impl(const _Impl&); // Not defined.
536 
537  void
538  operator=(const _Impl&); // Not defined.
539 
540  bool
541  _M_check_same_name()
542  {
543  bool __ret = true;
544  if (_M_names[1])
545  // We must actually compare all the _M_names: can be all equal!
546  for (size_t __i = 0; __ret && __i < _S_categories_size - 1; ++__i)
547  __ret = __builtin_strcmp(_M_names[__i], _M_names[__i + 1]) == 0;
548  return __ret;
549  }
550 
551  void
552  _M_replace_categories(const _Impl*, category);
553 
554  void
555  _M_replace_category(const _Impl*, const locale::id* const*);
556 
557  void
558  _M_replace_facet(const _Impl*, const locale::id*);
559 
560  void
561  _M_install_facet(const locale::id*, const facet*);
562 
563  template<typename _Facet>
564  void
565  _M_init_facet(_Facet* __facet)
566  { _M_install_facet(&_Facet::id, __facet); }
567 
568  void
569  _M_install_cache(const facet*, size_t);
570  };
571 
572 
573  /**
574  * @brief Facet for localized string comparison.
575  *
576  * This facet encapsulates the code to compare strings in a localized
577  * manner.
578  *
579  * The collate template uses protected virtual functions to provide
580  * the actual results. The public accessors forward the call to
581  * the virtual functions. These virtual functions are hooks for
582  * developers to implement the behavior they require from the
583  * collate facet.
584  */
585  template<typename _CharT>
586  class collate : public locale::facet
587  {
588  public:
589  // Types:
590  //@{
591  /// Public typedefs
592  typedef _CharT char_type;
594  //@}
595 
596  protected:
597  // Underlying "C" library locale information saved from
598  // initialization, needed by collate_byname as well.
599  __c_locale _M_c_locale_collate;
600 
601  public:
602  /// Numpunct facet id.
603  static locale::id id;
604 
605  /**
606  * @brief Constructor performs initialization.
607  *
608  * This is the constructor provided by the standard.
609  *
610  * @param __refs Passed to the base facet class.
611  */
612  explicit
613  collate(size_t __refs = 0)
614  : facet(__refs), _M_c_locale_collate(_S_get_c_locale())
615  { }
616 
617  /**
618  * @brief Internal constructor. Not for general use.
619  *
620  * This is a constructor for use by the library itself to set up new
621  * locales.
622  *
623  * @param __cloc The C locale.
624  * @param __refs Passed to the base facet class.
625  */
626  explicit
627  collate(__c_locale __cloc, size_t __refs = 0)
628  : facet(__refs), _M_c_locale_collate(_S_clone_c_locale(__cloc))
629  { }
630 
631  /**
632  * @brief Compare two strings.
633  *
634  * This function compares two strings and returns the result by calling
635  * collate::do_compare().
636  *
637  * @param __lo1 Start of string 1.
638  * @param __hi1 End of string 1.
639  * @param __lo2 Start of string 2.
640  * @param __hi2 End of string 2.
641  * @return 1 if string1 > string2, -1 if string1 < string2, else 0.
642  */
643  int
644  compare(const _CharT* __lo1, const _CharT* __hi1,
645  const _CharT* __lo2, const _CharT* __hi2) const
646  { return this->do_compare(__lo1, __hi1, __lo2, __hi2); }
647 
648  /**
649  * @brief Transform string to comparable form.
650  *
651  * This function is a wrapper for strxfrm functionality. It takes the
652  * input string and returns a modified string that can be directly
653  * compared to other transformed strings. In the C locale, this
654  * function just returns a copy of the input string. In some other
655  * locales, it may replace two chars with one, change a char for
656  * another, etc. It does so by returning collate::do_transform().
657  *
658  * @param __lo Start of string.
659  * @param __hi End of string.
660  * @return Transformed string_type.
661  */
662  string_type
663  transform(const _CharT* __lo, const _CharT* __hi) const
664  { return this->do_transform(__lo, __hi); }
665 
666  /**
667  * @brief Return hash of a string.
668  *
669  * This function computes and returns a hash on the input string. It
670  * does so by returning collate::do_hash().
671  *
672  * @param __lo Start of string.
673  * @param __hi End of string.
674  * @return Hash value.
675  */
676  long
677  hash(const _CharT* __lo, const _CharT* __hi) const
678  { return this->do_hash(__lo, __hi); }
679 
680  // Used to abstract out _CharT bits in virtual member functions, below.
681  int
682  _M_compare(const _CharT*, const _CharT*) const throw();
683 
684  size_t
685  _M_transform(_CharT*, const _CharT*, size_t) const throw();
686 
687  protected:
688  /// Destructor.
689  virtual
691  { _S_destroy_c_locale(_M_c_locale_collate); }
692 
693  /**
694  * @brief Compare two strings.
695  *
696  * This function is a hook for derived classes to change the value
697  * returned. @see compare().
698  *
699  * @param __lo1 Start of string 1.
700  * @param __hi1 End of string 1.
701  * @param __lo2 Start of string 2.
702  * @param __hi2 End of string 2.
703  * @return 1 if string1 > string2, -1 if string1 < string2, else 0.
704  */
705  virtual int
706  do_compare(const _CharT* __lo1, const _CharT* __hi1,
707  const _CharT* __lo2, const _CharT* __hi2) const;
708 
709  /**
710  * @brief Transform string to comparable form.
711  *
712  * This function is a hook for derived classes to change the value
713  * returned.
714  *
715  * @param __lo Start.
716  * @param __hi End.
717  * @return transformed string.
718  */
719  virtual string_type
720  do_transform(const _CharT* __lo, const _CharT* __hi) const;
721 
722  /**
723  * @brief Return hash of a string.
724  *
725  * This function computes and returns a hash on the input string. This
726  * function is a hook for derived classes to change the value returned.
727  *
728  * @param __lo Start of string.
729  * @param __hi End of string.
730  * @return Hash value.
731  */
732  virtual long
733  do_hash(const _CharT* __lo, const _CharT* __hi) const;
734  };
735 
736  template<typename _CharT>
737  locale::id collate<_CharT>::id;
738 
739  // Specializations.
740  template<>
741  int
742  collate<char>::_M_compare(const char*, const char*) const throw();
743 
744  template<>
745  size_t
746  collate<char>::_M_transform(char*, const char*, size_t) const throw();
747 
748 #ifdef _GLIBCXX_USE_WCHAR_T
749  template<>
750  int
751  collate<wchar_t>::_M_compare(const wchar_t*, const wchar_t*) const throw();
752 
753  template<>
754  size_t
755  collate<wchar_t>::_M_transform(wchar_t*, const wchar_t*, size_t) const throw();
756 #endif
757 
758  /// class collate_byname [22.2.4.2].
759  template<typename _CharT>
760  class collate_byname : public collate<_CharT>
761  {
762  public:
763  //@{
764  /// Public typedefs
765  typedef _CharT char_type;
767  //@}
768 
769  explicit
770  collate_byname(const char* __s, size_t __refs = 0)
771  : collate<_CharT>(__refs)
772  {
773  if (__builtin_strcmp(__s, "C") != 0
774  && __builtin_strcmp(__s, "POSIX") != 0)
775  {
776  this->_S_destroy_c_locale(this->_M_c_locale_collate);
777  this->_S_create_c_locale(this->_M_c_locale_collate, __s);
778  }
779  }
780 
781  protected:
782  virtual
783  ~collate_byname() { }
784  };
785 
786 _GLIBCXX_END_NAMESPACE_VERSION
787 } // namespace
788 
789 # include <bits/locale_classes.tcc>
790 
791 #endif
static const category none
Category values.
_Siter_base< _Iterator >::iterator_type __base(_Iterator __it)
static const category collate
Category values.
const locale & operator=(const locale &__other)
Assignment operator.
Localization functionality base class.The facet class is the base class for a localization feature...
bool operator==(const locale &__other) const
Locale equality.
static const category numeric
Category values.
collate(size_t __refs=0)
Constructor performs initialization.
Primary class template messages.This facet encapsulates the code to retrieve messages from message ca...
Primary class template ctype facet.This template class defines classification and conversion function...
facet(size_t __refs=0)
Facet constructor.
bool operator()(const basic_string< _Char, _Traits, _Alloc > &__s1, const basic_string< _Char, _Traits, _Alloc > &__s2) const
Compare two strings according to collate.
int compare(const _CharT *__lo1, const _CharT *__hi1, const _CharT *__lo2, const _CharT *__hi2) const
Compare two strings.
basic_string< _CharT > string_type
Public typedefs.
static const locale & classic()
Return reference to the C locale.
string name() const
Return locale name.
_CharT char_type
Public typedefs.
collate(__c_locale __cloc, size_t __refs=0)
Internal constructor. Not for general use.
Container class for localization functionality.The locale class is first a class wrapper for C librar...
class collate_byname [22.2.4.2].
string_type transform(const _CharT *__lo, const _CharT *__hi) const
Transform string to comparable form.
static const category time
Category values.
int category
Definition of locale::category.
Managing sequences of characters and character-like objects.
Definition: basic_string.h:109
static locale::id id
Numpunct facet id.
static const category all
Category values.
Facet ID class.The ID class provides facets with an index used to identify them. Every facet class mu...
friend const _Facet & use_facet(const locale &)
Return a facet.
static locale global(const locale &__loc)
Set global locale.
id()
Constructor.
locale()
Default constructor.
friend bool has_facet(const locale &)
Test for the presence of a facet.
locale combine(const locale &__other) const
Construct locale with another facet.
long hash(const _CharT *__lo, const _CharT *__hi) const
Return hash of a string.
static const category monetary
Category values.
Facet for localized string comparison.
_CharT char_type
Public typedefs.
basic_string< _CharT > string_type
Public typedefs.