# pod_char_traits.h

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    00001 // POD character, std::char_traits specialization -*- C++ -*-
    00002
    00003 // Copyright (C) 2002, 2003, 2004 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 /** @file ext/pod_char_traits.h
    00031  *  This file is a GNU extension to the Standard C++ Library.
    00032  */
    00033
    00034 // Gabriel Dos Reis <gdr@integrable-solutions.net>
    00035 // Benjamin Kosnik <bkoz@redhat.com>
    00036
    00037 #ifndef _POD_CHAR_TRAITS_H
    00038 #define _POD_CHAR_TRAITS_H 1
    00039
    00040 #include <string>
    00041
    00042 namespace __gnu_cxx
    00043 {
    00044   /// @brief A POD class that serves as a character abstraction class.
    00045   template<typename V, typename I, typename S = mbstate_t>
    00046     struct character
    00047     {
    00048       typedef V     value_type;
    00049       typedef I     int_type;
    00050       typedef S     state_type;
    00051       value_type    value;
    00052     };
    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
    00059   template<typename V, typename I>
    00060     inline bool
    00061     operator<(const character<V, I>& lhs, const character<V, I>& rhs)
    00062     { return lhs.value < rhs.value; }
    00063 } // namespace __gnu_cxx
    00064
    00065 namespace std
    00066 {
    00067   /// char_traits<__gnu_cxx::character> specialization.
    00068   template<typename V, typename I, typename S>
    00069     struct char_traits<__gnu_cxx::character<V, I, S> >
    00070     {
    00071       typedef __gnu_cxx::character<V, I, S> char_type;
    00072
    00073       // NB: This type should be bigger than char_type, so as to
    00074       // properly hold EOF values in addition to the full range of
    00075       // char_type values.
    00076       // Also, assumes
    00077       // int_type(value_type) is valid.
    00078       // int_type(-1) is possible.
    00079       typedef typename char_type::int_type  int_type;
    00080       typedef typename char_type::state_type    state_type;
    00081       typedef fpos<state_type>          pos_type;
    00082       typedef streamoff             off_type;
    00083
    00084       static void
    00085       assign(char_type& __c1, const char_type& __c2)
    00086       { __c1 = __c2; }
    00087
    00088       static bool
    00089       eq(const char_type& __c1, const char_type& __c2)
    00090       { return __c1 == __c2; }
    00091
    00092       static bool
    00093       lt(const char_type& __c1, const char_type& __c2)
    00094       { return __c1 < __c2; }
    00095
    00096       static int
    00097       compare(const char_type* __s1, const char_type* __s2, size_t __n)
    00098       {
    00099     for (size_t __i = 0; __i < __n; ++__i)
    00100       if (!eq(__s1[__i], __s2[__i]))
    00101         return lt(__s1[__i], __s2[__i]) ? -1 : 1;
    00102     return 0;
    00103       }
    00104
    00105       static size_t
    00106       length(const char_type* __s)
    00107       {
    00108     const char_type* __p = __s;
    00109     while (__p->value)
    00110       ++__p;
    00111     return (__p - __s);
    00112       }
    00113
    00114       static const char_type*
    00115       find(const char_type* __s, size_t __n, const char_type& __a)
    00116       {
    00117     for (const char_type* __p = __s; size_t(__p - __s) < __n; ++__p)
    00118       if (*__p == __a)
    00119         return __p;
    00120     return 0;
    00121       }
    00122
    00123       static char_type*
    00124       move(char_type* __s1, const char_type* __s2, size_t __n)
    00125       { return (char_type*) memmove(__s1, __s2, __n * sizeof(char_type)); }
    00126
    00127       static char_type*
    00128       copy(char_type* __s1, const char_type* __s2, size_t __n)
    00129       { return (char_type*) memcpy(__s1, __s2, __n * sizeof(char_type)); }
    00130
    00131       static char_type*
    00132       assign(char_type* __s, size_t __n, char_type __a)
    00133       {
    00134     for (char_type* __p = __s; __p < __s + __n; ++__p)
    00135       assign(*__p, __a);
    00136         return __s;
    00137       }
    00138
    00139       static char_type
    00140       to_char_type(const int_type& __c)
    00141       {
    00142     char_type __r = { __c };
    00143     return __r;
    00144       }
    00145
    00146       static int_type
    00147       to_int_type(const char_type& __c)
    00148       { return int_type(__c.value); }
    00149
    00150       static bool
    00151       eq_int_type(const int_type& __c1, const int_type& __c2)
    00152       { return __c1 == __c2; }
    00153
    00154       static int_type
    00155       eof() { return static_cast<int_type>(-1); }
    00156
    00157       static int_type
    00158       not_eof(const int_type& __c)
    00159       { return eq_int_type(__c, eof()) ? int_type(0) : __c; }
    00160     };
    00161 }
    00162
    00163 #endif