libstdc++-v3/include/ext/pod_char_traits.h

   1 // POD character, std::char_traits specialization -*- C++ -*-
   2
   3 // Copyright (C) 2002, 2003, 2004 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 /** @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   /// @brief A POD class that serves as a character abstraction class.
  45   template<typename V, typename I, typename S = mbstate_t>
  46     struct character
  47     {
  48       typedef V         value_type;
  49       typedef I         int_type;
  50       typedef S         state_type;
  51       value_type        value;
  52     };
  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
  59   template<typename V, typename I>
  60     inline bool
  61     operator<(const character<V, I>& lhs, const character<V, I>& rhs)
  62     { return lhs.value < rhs.value; }
  63 } // namespace __gnu_cxx
  64
  65 namespace std
  66 {
  67   /// char_traits<__gnu_cxx::character> specialization.
  68   template<typename V, typename I, typename S>
  69     struct char_traits<__gnu_cxx::character<V, I, S> >
  70     {
  71       typedef __gnu_cxx::character<V, I, S>     char_type;
  72
  73       // NB: This type should be bigger than char_type, so as to
  74       // properly hold EOF values in addition to the full range of
  75       // char_type values.
  76       // Also, assumes
  77       // int_type(value_type) is valid.
  78       // int_type(-1) is possible.
  79       typedef typename char_type::int_type      int_type;
  80       typedef typename char_type::state_type    state_type;
  81       typedef fpos<state_type>                  pos_type;
  82       typedef streamoff                         off_type;
  83
  84       static void
  85       assign(char_type& __c1, const char_type& __c2)
  86       { __c1 = __c2; }
  87
  88       static bool
  89       eq(const char_type& __c1, const char_type& __c2)
  90       { return __c1 == __c2; }
  91
  92       static bool
  93       lt(const char_type& __c1, const char_type& __c2)
  94       { return __c1 < __c2; }
  95
  96       static int
  97       compare(const char_type* __s1, const char_type* __s2, size_t __n)
  98       {
  99         for (size_t __i = 0; __i < __n; ++__i)
 100           if (!eq(__s1[__i], __s2[__i]))
 101             return lt(__s1[__i], __s2[__i]) ? -1 : 1;
 102         return 0;
 103       }
 104
 105       static size_t
 106       length(const char_type* __s)
 107       {
 108         const char_type* __p = __s;
 109         while (__p->value)
 110           ++__p;
 111         return (__p - __s);
 112       }
 113
 114       static const char_type*
 115       find(const char_type* __s, size_t __n, const char_type& __a)
 116       {
 117         for (const char_type* __p = __s; size_t(__p - __s) < __n; ++__p)
 118           if (*__p == __a)
 119             return __p;
 120         return 0;
 121       }
 122
 123       static char_type*
 124       move(char_type* __s1, const char_type* __s2, size_t __n)
 125       { return (char_type*) memmove(__s1, __s2, __n * sizeof(char_type)); }
 126
 127       static char_type*
 128       copy(char_type* __s1, const char_type* __s2, size_t __n)
 129       { return (char_type*) memcpy(__s1, __s2, __n * sizeof(char_type)); }
 130
 131       static char_type*
 132       assign(char_type* __s, size_t __n, char_type __a)
 133       {
 134         for (char_type* __p = __s; __p < __s + __n; ++__p)
 135           assign(*__p, __a);
 136         return __s;
 137       }
 138
 139       static char_type
 140       to_char_type(const int_type& __c)
 141       {
 142         char_type __r = { __c };
 143         return __r;
 144       }
 145
 146       static int_type
 147       to_int_type(const char_type& __c)
 148       { return int_type(__c.value); }
 149
 150       static bool
 151       eq_int_type(const int_type& __c1, const int_type& __c2)
 152       { return __c1 == __c2; }
 153
 154       static int_type
 155       eof() { return static_cast<int_type>(-1); }
 156
 157       static int_type
 158       not_eof(const int_type& __c)
 159       { return eq_int_type(__c, eof()) ? int_type(0) : __c; }
 160     };
 161 }
 162
 163 #endif