libstdc++
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00001 // POD character, std::char_traits specialization -*- C++ -*- 00002 00003 // Copyright (C) 2002, 2003, 2004, 2005, 2007, 2009, 2010, 2011 00004 // Free Software Foundation, Inc. 00005 // 00006 // This file is part of the GNU ISO C++ Library. This library is free 00007 // software; you can redistribute it and/or modify it under the 00008 // terms of the GNU General Public License as published by the 00009 // Free Software Foundation; either version 3, or (at your option) 00010 // any later version. 00011 00012 // This library is distributed in the hope that it will be useful, 00013 // but WITHOUT ANY WARRANTY; without even the implied warranty of 00014 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00015 // GNU General Public License for more details. 00016 00017 // Under Section 7 of GPL version 3, you are granted additional 00018 // permissions described in the GCC Runtime Library Exception, version 00019 // 3.1, as published by the Free Software Foundation. 00020 00021 // You should have received a copy of the GNU General Public License and 00022 // a copy of the GCC Runtime Library Exception along with this program; 00023 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 00024 // <http://www.gnu.org/licenses/>. 00025 00026 /** @file ext/pod_char_traits.h 00027 * This file is a GNU extension to the Standard C++ Library. 00028 */ 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 #pragma GCC system_header 00037 00038 #include <string> 00039 00040 namespace __gnu_cxx _GLIBCXX_VISIBILITY(default) 00041 { 00042 _GLIBCXX_BEGIN_NAMESPACE_VERSION 00043 00044 // POD character abstraction. 00045 // NB: The char_type parameter is a subset of int_type, as to allow 00046 // int_type to properly hold the full range of char_type values as 00047 // well as EOF. 00048 /// @brief A POD class that serves as a character abstraction class. 00049 template<typename V, typename I, typename S = std::mbstate_t> 00050 struct character 00051 { 00052 typedef V value_type; 00053 typedef I int_type; 00054 typedef S state_type; 00055 typedef character<V, I, S> char_type; 00056 00057 value_type value; 00058 00059 template<typename V2> 00060 static char_type 00061 from(const V2& v) 00062 { 00063 char_type ret = { static_cast<value_type>(v) }; 00064 return ret; 00065 } 00066 00067 template<typename V2> 00068 static V2 00069 to(const char_type& c) 00070 { 00071 V2 ret = { static_cast<V2>(c.value) }; 00072 return ret; 00073 } 00074 00075 }; 00076 00077 template<typename V, typename I, typename S> 00078 inline bool 00079 operator==(const character<V, I, S>& lhs, const character<V, I, S>& rhs) 00080 { return lhs.value == rhs.value; } 00081 00082 template<typename V, typename I, typename S> 00083 inline bool 00084 operator<(const character<V, I, S>& lhs, const character<V, I, S>& rhs) 00085 { return lhs.value < rhs.value; } 00086 00087 _GLIBCXX_END_NAMESPACE_VERSION 00088 } // namespace 00089 00090 namespace std _GLIBCXX_VISIBILITY(default) 00091 { 00092 _GLIBCXX_BEGIN_NAMESPACE_VERSION 00093 00094 /// char_traits<__gnu_cxx::character> specialization. 00095 template<typename V, typename I, typename S> 00096 struct char_traits<__gnu_cxx::character<V, I, S> > 00097 { 00098 typedef __gnu_cxx::character<V, I, S> char_type; 00099 typedef typename char_type::int_type int_type; 00100 typedef typename char_type::state_type state_type; 00101 typedef fpos<state_type> pos_type; 00102 typedef streamoff off_type; 00103 00104 static void 00105 assign(char_type& __c1, const char_type& __c2) 00106 { __c1 = __c2; } 00107 00108 static bool 00109 eq(const char_type& __c1, const char_type& __c2) 00110 { return __c1 == __c2; } 00111 00112 static bool 00113 lt(const char_type& __c1, const char_type& __c2) 00114 { return __c1 < __c2; } 00115 00116 static int 00117 compare(const char_type* __s1, const char_type* __s2, size_t __n) 00118 { 00119 for (size_t __i = 0; __i < __n; ++__i) 00120 if (!eq(__s1[__i], __s2[__i])) 00121 return lt(__s1[__i], __s2[__i]) ? -1 : 1; 00122 return 0; 00123 } 00124 00125 static size_t 00126 length(const char_type* __s) 00127 { 00128 const char_type* __p = __s; 00129 while (__p->value) 00130 ++__p; 00131 return (__p - __s); 00132 } 00133 00134 static const char_type* 00135 find(const char_type* __s, size_t __n, const char_type& __a) 00136 { 00137 for (const char_type* __p = __s; size_t(__p - __s) < __n; ++__p) 00138 if (*__p == __a) 00139 return __p; 00140 return 0; 00141 } 00142 00143 static char_type* 00144 move(char_type* __s1, const char_type* __s2, size_t __n) 00145 { 00146 return static_cast<char_type*> 00147 (__builtin_memmove(__s1, __s2, __n * sizeof(char_type))); 00148 } 00149 00150 static char_type* 00151 copy(char_type* __s1, const char_type* __s2, size_t __n) 00152 { 00153 std::copy(__s2, __s2 + __n, __s1); 00154 return __s1; 00155 } 00156 00157 static char_type* 00158 assign(char_type* __s, size_t __n, char_type __a) 00159 { 00160 std::fill_n(__s, __n, __a); 00161 return __s; 00162 } 00163 00164 static char_type 00165 to_char_type(const int_type& __i) 00166 { return char_type::template from(__i); } 00167 00168 static int_type 00169 to_int_type(const char_type& __c) 00170 { return char_type::template to<int_type>(__c); } 00171 00172 static bool 00173 eq_int_type(const int_type& __c1, const int_type& __c2) 00174 { return __c1 == __c2; } 00175 00176 static int_type 00177 eof() 00178 { 00179 int_type __r = { -1 }; 00180 return __r; 00181 } 00182 00183 static int_type 00184 not_eof(const int_type& __c) 00185 { return eq_int_type(__c, eof()) ? int_type() : __c; } 00186 }; 00187 00188 _GLIBCXX_END_NAMESPACE_VERSION 00189 } // namespace 00190 00191 #endif