libstdc++-v3/include/bits/localefwd.h

   1 // Locale support -*- C++ -*-
   2
   3 // Copyright (C) 1997, 1998, 1999, 2000, 2001 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 2, 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 // You should have received a copy of the GNU General Public License along
  17 // with this library; see the file COPYING.  If not, write to the Free
  18 // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
  19 // USA.
  20
  21 // As a special exception, you may use this file as part of a free software
  22 // library without restriction.  Specifically, if other files instantiate
  23 // templates or use macros or inline functions from this file, or you compile
  24 // this file and link it with other files to produce an executable, this
  25 // file does not by itself cause the resulting executable to be covered by
  26 // the GNU General Public License.  This exception does not however
  27 // invalidate any other reasons why the executable file might be covered by
  28 // the GNU General Public License.
  29
  30 //
  31 // ISO C++ 14882: 22.1  Locales
  32 //
  33
  34 /** @file localefwd.h
  35  *  This is an internal header file, included by other library headers.
  36  *  You should not attempt to use it directly.
  37  */
  38
  39 #ifndef _CPP_BITS_LOCCORE_H
  40 #define _CPP_BITS_LOCCORE_H     1
  41
  42 #pragma GCC system_header
  43
  44 #include <bits/c++config.h>
  45 #include <bits/c++locale.h>     // Defines __c_locale, config-specific includes
  46 #include <climits>      // For CHAR_BIT
  47 #include <cctype>       // For isspace, etc.
  48 #include <string>       // For string
  49 #include <bits/functexcept.h>
  50
  51 namespace std
  52 {
  53   // NB: Don't instantiate required wchar_t facets if no wchar_t support.
  54 #ifdef _GLIBCPP_USE_WCHAR_T
  55 # define  _GLIBCPP_NUM_FACETS 28
  56 #else
  57 # define  _GLIBCPP_NUM_FACETS 14
  58 #endif
  59
  60   // 22.1.1 Locale
  61   template<typename _Tp, typename _Alloc>
  62     class vector;
  63   class locale;
  64
  65   // 22.1.3 Convenience interfaces
  66   template<typename _CharT>
  67     inline bool
  68     isspace(_CharT, const locale&);
  69
  70   template<typename _CharT>
  71     inline bool
  72     isprint(_CharT, const locale&);
  73
  74   template<typename _CharT>
  75     inline bool
  76     iscntrl(_CharT, const locale&);
  77
  78   template<typename _CharT>
  79     inline bool
  80     isupper(_CharT, const locale&);
  81
  82   template<typename _CharT>
  83     inline bool
  84     islower(_CharT, const locale&);
  85
  86   template<typename _CharT>
  87     inline bool
  88     isalpha(_CharT, const locale&);
  89
  90   template<typename _CharT>
  91     inline bool
  92     isdigit(_CharT, const locale&);
  93
  94   template<typename _CharT>
  95     inline bool
  96     ispunct(_CharT, const locale&);
  97
  98   template<typename _CharT>
  99     inline bool
 100     isxdigit(_CharT, const locale&);
 101
 102   template<typename _CharT>
 103     inline bool
 104     isalnum(_CharT, const locale&);
 105
 106   template<typename _CharT>
 107     inline bool
 108     isgraph(_CharT, const locale&);
 109
 110   template<typename _CharT>
 111     inline _CharT
 112     toupper(_CharT, const locale&);
 113
 114   template<typename _CharT>
 115     inline _CharT
 116     tolower(_CharT, const locale&);
 117
 118
 119   // 22.2.1 and 22.2.1.3 ctype
 120   class ctype_base;
 121   template<typename _CharT>
 122     class ctype;
 123   template<> class ctype<char>;
 124 #ifdef _GLIBCPP_USE_WCHAR_T
 125   template<> class ctype<wchar_t>;
 126 #endif
 127   template<typename _CharT>
 128     class ctype_byname;
 129   // NB: Specialized for char and wchar_t in locale_facets.h.
 130
 131   class codecvt_base;
 132   class __enc_traits;
 133   template<typename _InternT, typename _ExternT, typename _StateT>
 134     class codecvt;
 135   template<> class codecvt<char, char, mbstate_t>;
 136 #ifdef _GLIBCPP_USE_WCHAR_T
 137   template<> class codecvt<wchar_t, char, mbstate_t>;
 138 #endif
 139   template<typename _InternT, typename _ExternT, typename _StateT>
 140     class codecvt_byname;
 141
 142   // 22.2.2 and 22.2.3 numeric
 143   template<typename _CharT, typename _InIter = istreambuf_iterator<_CharT> >
 144     class num_get;
 145   template<typename _CharT, typename _OutIter = ostreambuf_iterator<_CharT> >
 146     class num_put;
 147   template<typename _CharT> class numpunct;
 148   template<typename _CharT> class numpunct_byname;
 149
 150   // 22.2.4 collation
 151   template<typename _CharT>
 152     class collate;
 153   template<typename _CharT> class
 154     collate_byname;
 155
 156   // 22.2.5 date and time
 157   class time_base;
 158   template<typename _CharT, typename _InIter =  istreambuf_iterator<_CharT> >
 159     class time_get;
 160   template<typename _CharT, typename _InIter =  istreambuf_iterator<_CharT> >
 161     class time_get_byname;
 162   template<typename _CharT, typename _OutIter = ostreambuf_iterator<_CharT> >
 163     class time_put;
 164   template<typename _CharT, typename _OutIter = ostreambuf_iterator<_CharT> >
 165     class time_put_byname;
 166
 167   // 22.2.6 money
 168   class money_base;
 169   template<typename _CharT, typename _InIter =  istreambuf_iterator<_CharT> >
 170     class money_get;
 171   template<typename _CharT, typename _OutIter = ostreambuf_iterator<_CharT> >
 172     class money_put;
 173   template<typename _CharT, bool _Intl = false>
 174     class moneypunct;
 175   template<typename _CharT, bool _Intl = false>
 176     class moneypunct_byname;
 177
 178   // 22.2.7 message retrieval
 179   class messages_base;
 180   template<typename _CharT>
 181     class messages;
 182   template<typename _CharT>
 183     class messages_byname;
 184
 185   // 22.1.1 Class locale
 186   class locale
 187   {
 188   public:
 189     // Types:
 190     typedef unsigned int        category;
 191
 192     // Forward decls and friends:
 193     class facet;
 194     class id;
 195     class _Impl;
 196
 197     friend class facet;
 198     friend class _Impl;
 199
 200     template<typename _Facet>
 201       friend const _Facet&
 202       use_facet(const locale&);
 203
 204     template<typename _Facet>
 205       friend bool
 206       has_facet(const locale&) throw();
 207
 208     // Category values:
 209     // NB: Order must match _S_facet_categories definition in locale.cc
 210     static const category none          = 0;
 211     static const category ctype         = 1L << 0;
 212     static const category numeric       = 1L << 1;
 213     static const category collate       = 1L << 2;
 214     static const category time          = 1L << 3;
 215     static const category monetary      = 1L << 4;
 216     static const category messages      = 1L << 5;
 217     static const category all           = (collate | ctype | monetary |
 218                                            numeric | time  | messages);
 219
 220     // Construct/copy/destroy:
 221     locale() throw();
 222
 223     locale(const locale& __other) throw();
 224
 225     explicit
 226     locale(const char* __std_name);
 227
 228     locale(const locale& __base, const char* __s, category __cat);
 229
 230     locale(const locale& __base, const locale& __add, category __cat);
 231
 232     template<typename _Facet>
 233       locale(const locale& __other, _Facet* __f);
 234
 235     ~locale() throw();
 236
 237     const locale&
 238     operator=(const locale& __other) throw();
 239
 240     template<typename _Facet>
 241       locale
 242       combine(const locale& __other) const;
 243
 244     // Locale operations:
 245     string
 246     name() const;
 247
 248     bool
 249     operator==(const locale& __other) const throw ();
 250
 251     inline bool
 252     operator!=(const locale& __other) const throw ()
 253     { return !(this->operator==(__other));  }
 254
 255     template<typename _Char, typename _Traits, typename _Alloc>
 256       bool
 257       operator()(const basic_string<_Char, _Traits, _Alloc>& __s1,
 258                  const basic_string<_Char, _Traits, _Alloc>& __s2) const;
 259
 260     // Global locale objects:
 261     static locale
 262     global(const locale&);
 263
 264     static const locale&
 265     classic();
 266
 267   private:
 268     // The (shared) implementation
 269     _Impl*              _M_impl;
 270
 271     // The "C" reference locale
 272     static _Impl*       _S_classic;
 273
 274     // Current global reference locale
 275     static _Impl*       _S_global;
 276
 277     static const size_t _S_num_categories = 6;
 278     static const size_t _S_num_facets = _GLIBCPP_NUM_FACETS;
 279
 280     explicit
 281     locale(_Impl*) throw();
 282
 283     static inline void
 284     _S_initialize()
 285     {
 286       if (!_S_classic)
 287         classic();
 288     }
 289
 290     static category
 291     _S_normalize_category(category);
 292
 293     void
 294     _M_coalesce(const locale& __base, const locale& __add, category __cat);
 295   };
 296
 297
 298   // locale implementation object
 299   class locale::_Impl
 300   {
 301   public:
 302     // Types.
 303     typedef vector<facet*, allocator<facet*> >  __vec_facet;
 304
 305     // Friends.
 306     friend class locale;
 307     friend class locale::facet;
 308
 309     template<typename _Facet>
 310       friend const _Facet&
 311       use_facet(const locale&);
 312
 313     template<typename _Facet>
 314       friend bool
 315       has_facet(const locale&) throw();
 316
 317   private:
 318     // Data Members.
 319     size_t                              _M_references;
 320     __vec_facet*                        _M_facets;
 321     string                              _M_names[_S_num_categories];
 322     static const locale::id* const      _S_id_ctype[];
 323     static const locale::id* const      _S_id_numeric[];
 324     static const locale::id* const      _S_id_collate[];
 325     static const locale::id* const      _S_id_time[];
 326     static const locale::id* const      _S_id_monetary[];
 327     static const locale::id* const      _S_id_messages[];
 328     static const locale::id* const* const _S_facet_categories[];
 329
 330     inline void
 331     _M_add_reference() throw()
 332     { ++_M_references; }  // XXX MT
 333
 334     inline void
 335     _M_remove_reference() throw()
 336     {
 337       if (--_M_references == 0)  // XXX MT
 338         {
 339           try
 340             { delete this; }
 341           catch(...)
 342             { }
 343         }
 344     }
 345
 346     _Impl(const _Impl&, size_t);
 347     _Impl(string __name, size_t);
 348    ~_Impl() throw();
 349
 350     inline bool
 351     _M_check_same_name()
 352     {
 353       bool __ret = true;
 354       for (size_t i = 0; i < _S_num_categories - 1; ++i)
 355         __ret &= _M_names[i] == _M_names[i + 1];
 356       return __ret;
 357     }
 358
 359     void
 360     _M_replace_categories(const _Impl*, category);
 361
 362     void
 363     _M_replace_category(const _Impl*, const locale::id* const*);
 364
 365     void
 366     _M_replace_facet(const _Impl*, const locale::id*);
 367
 368     void
 369     _M_install_facet(const locale::id*, facet*);
 370
 371     template<typename _Facet>
 372       inline void
 373       _M_init_facet(_Facet* __facet)
 374       { _M_install_facet(&_Facet::id, __facet);  }
 375   };
 376
 377   template<typename _Facet>
 378     locale::locale(const locale& __other, _Facet* __f)
 379     {
 380       _M_impl = new _Impl(*__other._M_impl, 1);
 381       _M_impl->_M_install_facet(&_Facet::id, __f);
 382       for (size_t __i = 0; __i < _S_num_categories; ++__i)
 383         _M_impl->_M_names[__i] = "*";
 384     }
 385
 386   // 22.1.1.1.2  Class locale::facet
 387   class locale::facet
 388   {
 389     friend class locale;
 390     friend class locale::_Impl;
 391     friend class __enc_traits;
 392
 393   protected:
 394     // Contains data from the underlying "C" library for default "C"
 395     // and "POSIX" locales.
 396     static __c_locale                _S_c_locale;
 397
 398     explicit
 399     facet(size_t __refs = 0) throw();
 400
 401     virtual
 402     ~facet();
 403
 404     static void
 405     _S_create_c_locale(__c_locale& __cloc, const char* __s);
 406
 407     static __c_locale
 408     _S_clone_c_locale(__c_locale& __cloc);
 409
 410     static void
 411     _S_destroy_c_locale(__c_locale& __cloc);
 412
 413   private:
 414     size_t _M_references;
 415
 416     void
 417     _M_add_reference() throw();
 418
 419     void
 420     _M_remove_reference() throw();
 421
 422     facet(const facet&);  // not defined
 423
 424     void
 425     operator=(const facet&);  // not defined
 426   };
 427
 428
 429   // 22.1.1.1.3 Class locale::id
 430   class locale::id
 431   {
 432   private:
 433     friend class locale;
 434     friend class locale::_Impl;
 435     template<typename _Facet>
 436       friend const _Facet&
 437       use_facet(const locale&);
 438     template<typename _Facet>
 439       friend bool
 440       has_facet(const locale&) throw ();
 441
 442     // NB: There is no accessor for _M_index because it may be used
 443     // before the constructor is run; the effect of calling a member
 444     // function (even an inline) would be undefined.
 445     mutable size_t      _M_index;
 446
 447     // Last id number assigned
 448     static size_t       _S_highwater;
 449
 450     void
 451     operator=(const id&);  // not defined
 452
 453     id(const id&);  // not defined
 454
 455   public:
 456     // NB: This class is always a static data member, and thus can be
 457     // counted on to be zero-initialized.
 458     id();
 459   };
 460
 461   template<typename _Facet>
 462     const _Facet&
 463     use_facet(const locale& __loc);
 464
 465   template<typename _Facet>
 466     bool
 467     has_facet(const locale& __loc) throw();
 468 } // namespace std
 469
 470 #endif