libstdc++
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00001 // POD character, std::char_traits specialization -*- C++ -*- 00002 00003 // Copyright (C) 2002-2013 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 #pragma GCC system_header 00036 00037 #include <string> 00038 00039 namespace __gnu_cxx _GLIBCXX_VISIBILITY(default) 00040 { 00041 _GLIBCXX_BEGIN_NAMESPACE_VERSION 00042 00043 // POD character abstraction. 00044 // NB: The char_type parameter is a subset of int_type, as to allow 00045 // int_type to properly hold the full range of char_type values as 00046 // well as EOF. 00047 /// @brief A POD class that serves as a character abstraction class. 00048 template<typename V, typename I, typename S = std::mbstate_t> 00049 struct character 00050 { 00051 typedef V value_type; 00052 typedef I int_type; 00053 typedef S state_type; 00054 typedef character<V, I, S> char_type; 00055 00056 value_type value; 00057 00058 template<typename V2> 00059 static char_type 00060 from(const V2& v) 00061 { 00062 char_type ret = { static_cast<value_type>(v) }; 00063 return ret; 00064 } 00065 00066 template<typename V2> 00067 static V2 00068 to(const char_type& c) 00069 { 00070 V2 ret = { static_cast<V2>(c.value) }; 00071 return ret; 00072 } 00073 00074 }; 00075 00076 template<typename V, typename I, typename S> 00077 inline bool 00078 operator==(const character<V, I, S>& lhs, const character<V, I, S>& rhs) 00079 { return lhs.value == rhs.value; } 00080 00081 template<typename V, typename I, typename S> 00082 inline bool 00083 operator<(const character<V, I, S>& lhs, const character<V, I, S>& rhs) 00084 { return lhs.value < rhs.value; } 00085 00086 _GLIBCXX_END_NAMESPACE_VERSION 00087 } // namespace 00088 00089 namespace std _GLIBCXX_VISIBILITY(default) 00090 { 00091 _GLIBCXX_BEGIN_NAMESPACE_VERSION 00092 00093 /// char_traits<__gnu_cxx::character> specialization. 00094 template<typename V, typename I, typename S> 00095 struct char_traits<__gnu_cxx::character<V, I, S> > 00096 { 00097 typedef __gnu_cxx::character<V, I, S> char_type; 00098 typedef typename char_type::int_type int_type; 00099 typedef typename char_type::state_type state_type; 00100 typedef fpos<state_type> pos_type; 00101 typedef streamoff off_type; 00102 00103 static void 00104 assign(char_type& __c1, const char_type& __c2) 00105 { __c1 = __c2; } 00106 00107 static bool 00108 eq(const char_type& __c1, const char_type& __c2) 00109 { return __c1 == __c2; } 00110 00111 static bool 00112 lt(const char_type& __c1, const char_type& __c2) 00113 { return __c1 < __c2; } 00114 00115 static int 00116 compare(const char_type* __s1, const char_type* __s2, size_t __n) 00117 { 00118 for (size_t __i = 0; __i < __n; ++__i) 00119 if (!eq(__s1[__i], __s2[__i])) 00120 return lt(__s1[__i], __s2[__i]) ? -1 : 1; 00121 return 0; 00122 } 00123 00124 static size_t 00125 length(const char_type* __s) 00126 { 00127 const char_type* __p = __s; 00128 while (__p->value) 00129 ++__p; 00130 return (__p - __s); 00131 } 00132 00133 static const char_type* 00134 find(const char_type* __s, size_t __n, const char_type& __a) 00135 { 00136 for (const char_type* __p = __s; size_t(__p - __s) < __n; ++__p) 00137 if (*__p == __a) 00138 return __p; 00139 return 0; 00140 } 00141 00142 static char_type* 00143 move(char_type* __s1, const char_type* __s2, size_t __n) 00144 { 00145 return static_cast<char_type*> 00146 (__builtin_memmove(__s1, __s2, __n * sizeof(char_type))); 00147 } 00148 00149 static char_type* 00150 copy(char_type* __s1, const char_type* __s2, size_t __n) 00151 { 00152 std::copy(__s2, __s2 + __n, __s1); 00153 return __s1; 00154 } 00155 00156 static char_type* 00157 assign(char_type* __s, size_t __n, char_type __a) 00158 { 00159 std::fill_n(__s, __n, __a); 00160 return __s; 00161 } 00162 00163 static char_type 00164 to_char_type(const int_type& __i) 00165 { return char_type::template from(__i); } 00166 00167 static int_type 00168 to_int_type(const char_type& __c) 00169 { return char_type::template to<int_type>(__c); } 00170 00171 static bool 00172 eq_int_type(const int_type& __c1, const int_type& __c2) 00173 { return __c1 == __c2; } 00174 00175 static int_type 00176 eof() 00177 { 00178 int_type __r = { -1 }; 00179 return __r; 00180 } 00181 00182 static int_type 00183 not_eof(const int_type& __c) 00184 { return eq_int_type(__c, eof()) ? int_type() : __c; } 00185 }; 00186 00187 _GLIBCXX_END_NAMESPACE_VERSION 00188 } // namespace 00189 00190 #endif