gnu/dist/gcc4/libstdc++-v3/include/ext/pod_char_traits.h

   1 // POD character, std::char_traits specialization -*- C++ -*-
   2
   3 // Copyright (C) 2002, 2003, 2004, 2005 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, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
  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 /** @file ext/pod_char_traits.h
  31  *  This file is a GNU extension to the Standard C++ Library.
  32  */
  33
  34 // Gabriel Dos Reis <gdr@integrable-solutions.net>
  35 // Benjamin Kosnik <bkoz@redhat.com>
  36
  37 #ifndef _POD_CHAR_TRAITS_H
  38 #define _POD_CHAR_TRAITS_H 1
  39
  40 #include <string>
  41
  42 namespace __gnu_cxx
  43 {
  44   // POD character abstraction.
  45   // NB: The char_type parameter is a subset of int_type, as to allow
  46   // int_type to properly hold the full range of char_type values as
  47   // well as EOF.
  48   /// @brief A POD class that serves as a character abstraction class.
  49   template<typename V, typename I, typename S = mbstate_t>
  50     struct character
  51     {
  52       typedef V                         value_type;
  53       typedef I                         int_type;
  54       typedef S                         state_type;
  55       typedef character<V, I, S>        char_type;
  56
  57       value_type        value;
  58
  59       template<typename V2>
  60         static char_type
  61         from(const V2& v)
  62         {
  63           char_type ret = { static_cast<value_type>(v) };
  64           return ret;
  65         }
  66
  67       template<typename V2>
  68         static V2
  69         to(const char_type& c)
  70         {
  71           V2 ret = { static_cast<V2>(c.value) };
  72           return ret;
  73         }
  74
  75     };
  76
  77   template<typename V, typename I, typename S>
  78     inline bool
  79     operator==(const character<V, I, S>& lhs, const character<V, I, S>& rhs)
  80     { return lhs.value == rhs.value; }
  81
  82   template<typename V, typename I, typename S>
  83     inline bool
  84     operator<(const character<V, I, S>& lhs, const character<V, I, S>& rhs)
  85     { return lhs.value < rhs.value; }
  86 } // namespace __gnu_cxx
  87
  88 namespace std
  89 {
  90   /// char_traits<__gnu_cxx::character> specialization.
  91   template<typename V, typename I, typename S>
  92     struct char_traits<__gnu_cxx::character<V, I, S> >
  93     {
  94       typedef __gnu_cxx::character<V, I, S>     char_type;
  95       typedef typename char_type::int_type      int_type;
  96       typedef typename char_type::state_type    state_type;
  97       typedef fpos<state_type>                  pos_type;
  98       typedef streamoff                         off_type;
  99
 100       static void
 101       assign(char_type& __c1, const char_type& __c2)
 102       { __c1 = __c2; }
 103
 104       static bool
 105       eq(const char_type& __c1, const char_type& __c2)
 106       { return __c1 == __c2; }
 107
 108       static bool
 109       lt(const char_type& __c1, const char_type& __c2)
 110       { return __c1 < __c2; }
 111
 112       static int
 113       compare(const char_type* __s1, const char_type* __s2, size_t __n)
 114       {
 115         for (size_t __i = 0; __i < __n; ++__i)
 116           if (!eq(__s1[__i], __s2[__i]))
 117             return lt(__s1[__i], __s2[__i]) ? -1 : 1;
 118         return 0;
 119       }
 120
 121       static size_t
 122       length(const char_type* __s)
 123       {
 124         const char_type* __p = __s;
 125         while (__p->value)
 126           ++__p;
 127         return (__p - __s);
 128       }
 129
 130       static const char_type*
 131       find(const char_type* __s, size_t __n, const char_type& __a)
 132       {
 133         for (const char_type* __p = __s; size_t(__p - __s) < __n; ++__p)
 134           if (*__p == __a)
 135             return __p;
 136         return 0;
 137       }
 138
 139       static char_type*
 140       move(char_type* __s1, const char_type* __s2, size_t __n)
 141       {
 142         return static_cast<char_type*>(std::memmove(__s1, __s2,
 143                                                     __n * sizeof(char_type)));
 144       }
 145
 146       static char_type*
 147       copy(char_type* __s1, const char_type* __s2, size_t __n)
 148       {
 149         std::copy(__s2, __s2 + __n, __s1);
 150         return __s1;
 151       }
 152
 153       static char_type*
 154       assign(char_type* __s, size_t __n, char_type __a)
 155       {
 156         std::fill_n(__s, __n, __a);
 157         return __s;
 158       }
 159
 160       static char_type
 161       to_char_type(const int_type& __i)
 162       { return char_type::template from(__i); }
 163
 164       static int_type
 165       to_int_type(const char_type& __c)
 166       { return char_type::template to<int_type>(__c); }
 167
 168       static bool
 169       eq_int_type(const int_type& __c1, const int_type& __c2)
 170       { return __c1 == __c2; }
 171
 172       static int_type
 173       eof()
 174       {
 175         int_type __r = { -1 };
 176         return __r;
 177       }
 178
 179       static int_type
 180       not_eof(const int_type& __c)
 181       { return eq_int_type(__c, eof()) ? int_type() : __c; }
 182     };
 183 }
 184
 185 #endif