mingw/include/c++/3.4.2/ext/pod_char_traits.h

   1 // POD character, std::char_traits specialization -*- C++ -*-
   2
   3 // Copyright (C) 2002, 2003 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 // Gabriel Dos Reis <gdr@integrable-solutions.net>
  31 // Benjamin Kosnik <bkoz@redhat.com>
  32
  33 #ifndef _POD_CHAR_TRAITS_H
  34 #define _POD_CHAR_TRAITS_H 1
  35
  36 #include <string>
  37
  38 namespace __gnu_cxx
  39 {
  40   template<typename V, typename I, typename S = mbstate_t>
  41     struct character
  42     {
  43       typedef V         value_type;
  44       typedef I         int_type;
  45       typedef S         state_type;
  46       value_type        value;
  47     };
  48
  49   template<typename V, typename I>
  50     inline bool
  51     operator==(const character<V, I>& lhs, const character<V, I>& rhs)
  52     { return lhs.value == rhs.value; }
  53
  54   template<typename V, typename I>
  55     inline bool
  56     operator<(const character<V, I>& lhs, const character<V, I>& rhs)
  57     { return lhs.value < rhs.value; }
  58 } // namespace __gnu_cxx
  59
  60 namespace std
  61 {
  62   // Provide std::char_traits specialization.
  63   template<typename V, typename I, typename S>
  64     struct char_traits<__gnu_cxx::character<V, I, S> >
  65     {
  66       typedef __gnu_cxx::character<V, I, S>     char_type;
  67
  68       // NB: This type should be bigger than char_type, so as to
  69       // properly hold EOF values in addition to the full range of
  70       // char_type values.
  71       // Also, assumes
  72       // int_type(value_type) is valid.
  73       // int_type(-1) is possible.
  74       typedef typename char_type::int_type      int_type;
  75       typedef typename char_type::state_type    state_type;
  76       typedef fpos<state_type>                  pos_type;
  77       typedef streamoff                         off_type;
  78
  79       static void
  80       assign(char_type& __c1, const char_type& __c2)
  81       { __c1 = __c2; }
  82
  83       static bool
  84       eq(const char_type& __c1, const char_type& __c2)
  85       { return __c1 == __c2; }
  86
  87       static bool
  88       lt(const char_type& __c1, const char_type& __c2)
  89       { return __c1 < __c2; }
  90
  91       static int
  92       compare(const char_type* __s1, const char_type* __s2, size_t __n)
  93       {
  94         for (size_t __i = 0; __i < __n; ++__i)
  95           if (!eq(__s1[__i], __s2[__i]))
  96             return lt(__s1[__i], __s2[__i]) ? -1 : 1;
  97         return 0;
  98       }
  99
 100       static size_t
 101       length(const char_type* __s)
 102       {
 103         const char_type* __p = __s;
 104         while (__p->value)
 105           ++__p;
 106         return (__p - __s);
 107       }
 108
 109       static const char_type*
 110       find(const char_type* __s, size_t __n, const char_type& __a)
 111       {
 112         for (const char_type* __p = __s; size_t(__p - __s) < __n; ++__p)
 113           if (*__p == __a)
 114             return __p;
 115         return 0;
 116       }
 117
 118       static char_type*
 119       move(char_type* __s1, const char_type* __s2, size_t __n)
 120       { return (char_type*) memmove(__s1, __s2, __n * sizeof(char_type)); }
 121
 122       static char_type*
 123       copy(char_type* __s1, const char_type* __s2, size_t __n)
 124       { return (char_type*) memcpy(__s1, __s2, __n * sizeof(char_type)); }
 125
 126       static char_type*
 127       assign(char_type* __s, size_t __n, char_type __a)
 128       {
 129         for (char_type* __p = __s; __p < __s + __n; ++__p)
 130           assign(*__p, __a);
 131         return __s;
 132       }
 133
 134       static char_type
 135       to_char_type(const int_type& __c)
 136       {
 137         char_type __r = { __c };
 138         return __r;
 139       }
 140
 141       static int_type
 142       to_int_type(const char_type& __c)
 143       { return int_type(__c.value); }
 144
 145       static bool
 146       eq_int_type(const int_type& __c1, const int_type& __c2)
 147       { return __c1 == __c2; }
 148
 149       static int_type
 150       eof() { return static_cast<int_type>(-1); }
 151
 152       static int_type
 153       not_eof(const int_type& __c)
 154       { return eq_int_type(__c, eof()) ? int_type(0) : __c; }
 155     };
 156 }
 157
 158 #endif