libstdc++-v3/include/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>
  41     struct character
  42     {
  43       typedef V         value_type;
  44       typedef I         int_type;
  45       value_type        value;
  46     };
  47
  48   template<typename V, typename I>
  49     inline bool
  50     operator==(const character<V, I>& lhs, const character<V, I>& rhs)
  51     { return lhs.value == rhs.value; }
  52
  53   template<typename V, typename I>
  54     inline bool
  55     operator<(const character<V, I>& lhs, const character<V, I>& rhs)
  56     { return lhs.value < rhs.value; }
  57 } // namespace __gnu_cxx
  58
  59 namespace std
  60 {
  61   // Provide std::char_traits specialization.
  62   template<typename V, typename I>
  63     struct char_traits<__gnu_cxx::character<V, I> >
  64     {
  65       typedef __gnu_cxx::character<V, I>        char_type;
  66
  67       // NB: This type should be bigger than char_type, so as to
  68       // properly hold EOF values in addition to the full range of
  69       // char_type values.
  70       typedef typename char_type::int_type      int_type;
  71
  72       typedef streampos                         pos_type;
  73       typedef streamoff                         off_type;
  74       typedef mbstate_t                         state_type;
  75
  76       static void
  77       assign(char_type& __c1, const char_type& __c2)
  78       { __c1 = __c2; }
  79
  80       static bool
  81       eq(const char_type& __c1, const char_type& __c2)
  82       { return __c1 == __c2; }
  83
  84       static bool
  85       lt(const char_type& __c1, const char_type& __c2)
  86       { return __c1 < __c2; }
  87
  88       static int
  89       compare(const char_type* __s1, const char_type* __s2, size_t __n)
  90       {
  91         for (size_t __i = 0; __i < __n; ++__i)
  92           if (!eq(__s1[__i], __s2[__i]))
  93             return lt(__s1[__i], __s2[__i]) ? -1 : 1;
  94         return 0;
  95       }
  96
  97       static size_t
  98       length(const char_type* __s)
  99       {
 100         const char_type* __p = __s;
 101         while (*__p)
 102           ++__p;
 103         return (__p - __s);
 104       }
 105
 106       static const char_type*
 107       find(const char_type* __s, size_t __n, const char_type& __a)
 108       {
 109         for (const char_type* __p = __s; size_t(__p - __s) < __n; ++__p)
 110           if (*__p == __a)
 111             return __p;
 112         return 0;
 113       }
 114
 115       static char_type*
 116       move(char_type* __s1, const char_type* __s2, size_t __n)
 117       { return (char_type*) memmove(__s1, __s2, __n * sizeof(char_type)); }
 118
 119       static char_type*
 120       copy(char_type* __s1, const char_type* __s2, size_t __n)
 121       { return (char_type*) memcpy(__s1, __s2, __n * sizeof(char_type)); }
 122
 123       static char_type*
 124       assign(char_type* __s, size_t __n, char_type __a)
 125       {
 126         for (char_type* __p = __s; __p < __s + __n; ++__p)
 127           assign(*__p, __a);
 128         return __s;
 129       }
 130
 131       static char_type
 132       to_char_type(const int_type& __c)
 133       {
 134         char_type __r = { __c };
 135         return __r;
 136       }
 137
 138       static int_type
 139       to_int_type(const char_type& __c)
 140       { return int_type(__c.value); }
 141
 142       static bool
 143       eq_int_type(const int_type& __c1, const int_type& __c2)
 144       { return __c1 == __c2; }
 145
 146       static int_type
 147       eof() { return static_cast<int_type>(-1); }
 148
 149       static int_type
 150       not_eof(const int_type& __c)
 151       { return eq_int_type(__c, eof()) ? int_type(0) : __c; }
 152     };
 153 }
 154
 155 #endif