# pod_char_traits.h

    00001 // POD character, std::char_traits specialization -*- C++ -*-
    00002
    00003 // Copyright (C) 2002, 2003 Free Software Foundation, Inc.
    00004 //
    00005 // This file is part of the GNU ISO C++ Library.  This library is free
    00006 // software; you can redistribute it and/or modify it under the
    00007 // terms of the GNU General Public License as published by the
    00008 // Free Software Foundation; either version 2, or (at your option)
    00009 // any later version.
    00010
    00011 // This library is distributed in the hope that it will be useful,
    00012 // but WITHOUT ANY WARRANTY; without even the implied warranty of
    00013 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    00014 // GNU General Public License for more details.
    00015
    00016 // You should have received a copy of the GNU General Public License along
    00017 // with this library; see the file COPYING.  If not, write to the Free
    00018 // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
    00019 // USA.
    00020
    00021 // As a special exception, you may use this file as part of a free software
    00022 // library without restriction.  Specifically, if other files instantiate
    00023 // templates or use macros or inline functions from this file, or you compile
    00024 // this file and link it with other files to produce an executable, this
    00025 // file does not by itself cause the resulting executable to be covered by
    00026 // the GNU General Public License.  This exception does not however
    00027 // invalidate any other reasons why the executable file might be covered by
    00028 // the GNU General Public License.
    00029
    00030 // Gabriel Dos Reis <gdr@integrable-solutions.net>
    00031 // Benjamin Kosnik <bkoz@redhat.com>
    00032
    00033 #ifndef _POD_CHAR_TRAITS_H
    00034 #define _POD_CHAR_TRAITS_H 1
    00035
    00036 #include <string>
    00037
    00038 namespace __gnu_cxx
    00039 {
    00040   template<typename V, typename I, typename S = mbstate_t>
    00041     struct character
    00042     {
    00043       typedef V     value_type;
    00044       typedef I     int_type;
    00045       typedef S     state_type;
    00046       value_type    value;
    00047     };
    00048
    00049   template<typename V, typename I>
    00050     inline bool
    00051     operator==(const character<V, I>& lhs, const character<V, I>& rhs)
    00052     { return lhs.value == rhs.value; }
    00053
    00054   template<typename V, typename I>
    00055     inline bool
    00056     operator<(const character<V, I>& lhs, const character<V, I>& rhs)
    00057     { return lhs.value < rhs.value; }
    00058 } // namespace __gnu_cxx
    00059
    00060 namespace std
    00061 {
    00062   // Provide std::char_traits specialization.
    00063   template<typename V, typename I, typename S>
    00064     struct char_traits<__gnu_cxx::character<V, I, S> >
    00065     {
    00066       typedef __gnu_cxx::character<V, I, S> char_type;
    00067
    00068       // NB: This type should be bigger than char_type, so as to
    00069       // properly hold EOF values in addition to the full range of
    00070       // char_type values.
    00071       // Also, assumes
    00072       // int_type(value_type) is valid.
    00073       // int_type(-1) is possible.
    00074       typedef typename char_type::int_type  int_type;
    00075       typedef typename char_type::state_type    state_type;
    00076       typedef fpos<state_type>          pos_type;
    00077       typedef streamoff             off_type;
    00078
    00079       static void
    00080       assign(char_type& __c1, const char_type& __c2)
    00081       { __c1 = __c2; }
    00082
    00083       static bool
    00084       eq(const char_type& __c1, const char_type& __c2)
    00085       { return __c1 == __c2; }
    00086
    00087       static bool
    00088       lt(const char_type& __c1, const char_type& __c2)
    00089       { return __c1 < __c2; }
    00090
    00091       static int
    00092       compare(const char_type* __s1, const char_type* __s2, size_t __n)
    00093       {
    00094     for (size_t __i = 0; __i < __n; ++__i)
    00095       if (!eq(__s1[__i], __s2[__i]))
    00096         return lt(__s1[__i], __s2[__i]) ? -1 : 1;
    00097     return 0;
    00098       }
    00099
    00100       static size_t
    00101       length(const char_type* __s)
    00102       {
    00103     const char_type* __p = __s;
    00104     while (__p->value)
    00105       ++__p;
    00106     return (__p - __s);
    00107       }
    00108
    00109       static const char_type*
    00110       find(const char_type* __s, size_t __n, const char_type& __a)
    00111       {
    00112     for (const char_type* __p = __s; size_t(__p - __s) < __n; ++__p)
    00113       if (*__p == __a)
    00114         return __p;
    00115     return 0;
    00116       }
    00117
    00118       static char_type*
    00119       move(char_type* __s1, const char_type* __s2, size_t __n)
    00120       { return (char_type*) memmove(__s1, __s2, __n * sizeof(char_type)); }
    00121
    00122       static char_type*
    00123       copy(char_type* __s1, const char_type* __s2, size_t __n)
    00124       { return (char_type*) memcpy(__s1, __s2, __n * sizeof(char_type)); }
    00125
    00126       static char_type*
    00127       assign(char_type* __s, size_t __n, char_type __a)
    00128       {
    00129     for (char_type* __p = __s; __p < __s + __n; ++__p)
    00130       assign(*__p, __a);
    00131         return __s;
    00132       }
    00133
    00134       static char_type
    00135       to_char_type(const int_type& __c)
    00136       {
    00137     char_type __r = { __c };
    00138     return __r;
    00139       }
    00140
    00141       static int_type
    00142       to_int_type(const char_type& __c)
    00143       { return int_type(__c.value); }
    00144
    00145       static bool
    00146       eq_int_type(const int_type& __c1, const int_type& __c2)
    00147       { return __c1 == __c2; }
    00148
    00149       static int_type
    00150       eof() { return static_cast<int_type>(-1); }
    00151
    00152       static int_type
    00153       not_eof(const int_type& __c)
    00154       { return eq_int_type(__c, eof()) ? int_type(0) : __c; }
    00155     };
    00156 }
    00157
    00158 #endif