libstdc++
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00001 // POD character, std::char_traits specialization -*- C++ -*- 00002 00003 // Copyright (C) 2002, 2003, 2004, 2005, 2007, 2009 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 3, 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 // Under Section 7 of GPL version 3, you are granted additional 00017 // permissions described in the GCC Runtime Library Exception, version 00018 // 3.1, as published by the Free Software Foundation. 00019 00020 // You should have received a copy of the GNU General Public License and 00021 // a copy of the GCC Runtime Library Exception along with this program; 00022 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 00023 // <http://www.gnu.org/licenses/>. 00024 00025 /** @file ext/pod_char_traits.h 00026 * This file is a GNU extension to the Standard C++ Library. 00027 */ 00028 00029 // Gabriel Dos Reis <gdr@integrable-solutions.net> 00030 // Benjamin Kosnik <bkoz@redhat.com> 00031 00032 #ifndef _POD_CHAR_TRAITS_H 00033 #define _POD_CHAR_TRAITS_H 1 00034 00035 #include <string> 00036 00037 namespace __gnu_cxx _GLIBCXX_VISIBILITY(default) 00038 { 00039 _GLIBCXX_BEGIN_NAMESPACE_VERSION 00040 00041 // POD character abstraction. 00042 // NB: The char_type parameter is a subset of int_type, as to allow 00043 // int_type to properly hold the full range of char_type values as 00044 // well as EOF. 00045 /// @brief A POD class that serves as a character abstraction class. 00046 template<typename V, typename I, typename S = std::mbstate_t> 00047 struct character 00048 { 00049 typedef V value_type; 00050 typedef I int_type; 00051 typedef S state_type; 00052 typedef character<V, I, S> char_type; 00053 00054 value_type value; 00055 00056 template<typename V2> 00057 static char_type 00058 from(const V2& v) 00059 { 00060 char_type ret = { static_cast<value_type>(v) }; 00061 return ret; 00062 } 00063 00064 template<typename V2> 00065 static V2 00066 to(const char_type& c) 00067 { 00068 V2 ret = { static_cast<V2>(c.value) }; 00069 return ret; 00070 } 00071 00072 }; 00073 00074 template<typename V, typename I, typename S> 00075 inline bool 00076 operator==(const character<V, I, S>& lhs, const character<V, I, S>& rhs) 00077 { return lhs.value == rhs.value; } 00078 00079 template<typename V, typename I, typename S> 00080 inline bool 00081 operator<(const character<V, I, S>& lhs, const character<V, I, S>& rhs) 00082 { return lhs.value < rhs.value; } 00083 00084 _GLIBCXX_END_NAMESPACE_VERSION 00085 } // namespace 00086 00087 namespace std _GLIBCXX_VISIBILITY(default) 00088 { 00089 _GLIBCXX_BEGIN_NAMESPACE_VERSION 00090 00091 /// char_traits<__gnu_cxx::character> specialization. 00092 template<typename V, typename I, typename S> 00093 struct char_traits<__gnu_cxx::character<V, I, S> > 00094 { 00095 typedef __gnu_cxx::character<V, I, S> char_type; 00096 typedef typename char_type::int_type int_type; 00097 typedef typename char_type::state_type state_type; 00098 typedef fpos<state_type> pos_type; 00099 typedef streamoff off_type; 00100 00101 static void 00102 assign(char_type& __c1, const char_type& __c2) 00103 { __c1 = __c2; } 00104 00105 static bool 00106 eq(const char_type& __c1, const char_type& __c2) 00107 { return __c1 == __c2; } 00108 00109 static bool 00110 lt(const char_type& __c1, const char_type& __c2) 00111 { return __c1 < __c2; } 00112 00113 static int 00114 compare(const char_type* __s1, const char_type* __s2, size_t __n) 00115 { 00116 for (size_t __i = 0; __i < __n; ++__i) 00117 if (!eq(__s1[__i], __s2[__i])) 00118 return lt(__s1[__i], __s2[__i]) ? -1 : 1; 00119 return 0; 00120 } 00121 00122 static size_t 00123 length(const char_type* __s) 00124 { 00125 const char_type* __p = __s; 00126 while (__p->value) 00127 ++__p; 00128 return (__p - __s); 00129 } 00130 00131 static const char_type* 00132 find(const char_type* __s, size_t __n, const char_type& __a) 00133 { 00134 for (const char_type* __p = __s; size_t(__p - __s) < __n; ++__p) 00135 if (*__p == __a) 00136 return __p; 00137 return 0; 00138 } 00139 00140 static char_type* 00141 move(char_type* __s1, const char_type* __s2, size_t __n) 00142 { 00143 return static_cast<char_type*> 00144 (__builtin_memmove(__s1, __s2, __n * sizeof(char_type))); 00145 } 00146 00147 static char_type* 00148 copy(char_type* __s1, const char_type* __s2, size_t __n) 00149 { 00150 std::copy(__s2, __s2 + __n, __s1); 00151 return __s1; 00152 } 00153 00154 static char_type* 00155 assign(char_type* __s, size_t __n, char_type __a) 00156 { 00157 std::fill_n(__s, __n, __a); 00158 return __s; 00159 } 00160 00161 static char_type 00162 to_char_type(const int_type& __i) 00163 { return char_type::template from(__i); } 00164 00165 static int_type 00166 to_int_type(const char_type& __c) 00167 { return char_type::template to<int_type>(__c); } 00168 00169 static bool 00170 eq_int_type(const int_type& __c1, const int_type& __c2) 00171 { return __c1 == __c2; } 00172 00173 static int_type 00174 eof() 00175 { 00176 int_type __r = { -1 }; 00177 return __r; 00178 } 00179 00180 static int_type 00181 not_eof(const int_type& __c) 00182 { return eq_int_type(__c, eof()) ? int_type() : __c; } 00183 }; 00184 00185 _GLIBCXX_END_NAMESPACE_VERSION 00186 } // namespace 00187 00188 #endif