1 // POD character, std::char_traits specialization -*- C++ -*- 2 3 // Copyright (C) 2002-2013 Free Software Foundation, Inc. 4 // 5 // This file is part of the GNU ISO C++ Library. This library is free 6 // software; you can redistribute it and/or modify it under the 7 // terms of the GNU General Public License as published by the 8 // Free Software Foundation; either version 3, or (at your option) 9 // any later version. 10 11 // This library is distributed in the hope that it will be useful, 12 // but WITHOUT ANY WARRANTY; without even the implied warranty of 13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 // GNU General Public License for more details. 15 16 // Under Section 7 of GPL version 3, you are granted additional 17 // permissions described in the GCC Runtime Library Exception, version 18 // 3.1, as published by the Free Software Foundation. 19 20 // You should have received a copy of the GNU General Public License and 21 // a copy of the GCC Runtime Library Exception along with this program; 22 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 23 // <http://www.gnu.org/licenses/>. 24 25 /** @file ext/pod_char_traits.h 26 * This file is a GNU extension to the Standard C++ Library. 27 */ 28 29 // Gabriel Dos Reis <gdr (at) integrable-solutions.net> 30 // Benjamin Kosnik <bkoz (at) redhat.com> 31 32 #ifndef _POD_CHAR_TRAITS_H 33 #define _POD_CHAR_TRAITS_H 1 34 35 #pragma GCC system_header 36 37 #include <string> 38 39 namespace __gnu_cxx _GLIBCXX_VISIBILITY(default) 40 { 41 _GLIBCXX_BEGIN_NAMESPACE_VERSION 42 43 // POD character abstraction. 44 // NB: The char_type parameter is a subset of int_type, as to allow 45 // int_type to properly hold the full range of char_type values as 46 // well as EOF. 47 /// @brief A POD class that serves as a character abstraction class. 48 template<typename V, typename I, typename S = std::mbstate_t> 49 struct character 50 { 51 typedef V value_type; 52 typedef I int_type; 53 typedef S state_type; 54 typedef character<V, I, S> char_type; 55 56 value_type value; 57 58 template<typename V2> 59 static char_type 60 from(const V2& v) 61 { 62 char_type ret = { static_cast<value_type>(v) }; 63 return ret; 64 } 65 66 template<typename V2> 67 static V2 68 to(const char_type& c) 69 { 70 V2 ret = { static_cast<V2>(c.value) }; 71 return ret; 72 } 73 74 }; 75 76 template<typename V, typename I, typename S> 77 inline bool 78 operator==(const character<V, I, S>& lhs, const character<V, I, S>& rhs) 79 { return lhs.value == rhs.value; } 80 81 template<typename V, typename I, typename S> 82 inline bool 83 operator<(const character<V, I, S>& lhs, const character<V, I, S>& rhs) 84 { return lhs.value < rhs.value; } 85 86 _GLIBCXX_END_NAMESPACE_VERSION 87 } // namespace 88 89 namespace std _GLIBCXX_VISIBILITY(default) 90 { 91 _GLIBCXX_BEGIN_NAMESPACE_VERSION 92 93 /// char_traits<__gnu_cxx::character> specialization. 94 template<typename V, typename I, typename S> 95 struct char_traits<__gnu_cxx::character<V, I, S> > 96 { 97 typedef __gnu_cxx::character<V, I, S> char_type; 98 typedef typename char_type::int_type int_type; 99 typedef typename char_type::state_type state_type; 100 typedef fpos<state_type> pos_type; 101 typedef streamoff off_type; 102 103 static void 104 assign(char_type& __c1, const char_type& __c2) 105 { __c1 = __c2; } 106 107 static bool 108 eq(const char_type& __c1, const char_type& __c2) 109 { return __c1 == __c2; } 110 111 static bool 112 lt(const char_type& __c1, const char_type& __c2) 113 { return __c1 < __c2; } 114 115 static int 116 compare(const char_type* __s1, const char_type* __s2, size_t __n) 117 { 118 for (size_t __i = 0; __i < __n; ++__i) 119 if (!eq(__s1[__i], __s2[__i])) 120 return lt(__s1[__i], __s2[__i]) ? -1 : 1; 121 return 0; 122 } 123 124 static size_t 125 length(const char_type* __s) 126 { 127 const char_type* __p = __s; 128 while (__p->value) 129 ++__p; 130 return (__p - __s); 131 } 132 133 static const char_type* 134 find(const char_type* __s, size_t __n, const char_type& __a) 135 { 136 for (const char_type* __p = __s; size_t(__p - __s) < __n; ++__p) 137 if (*__p == __a) 138 return __p; 139 return 0; 140 } 141 142 static char_type* 143 move(char_type* __s1, const char_type* __s2, size_t __n) 144 { 145 return static_cast<char_type*> 146 (__builtin_memmove(__s1, __s2, __n * sizeof(char_type))); 147 } 148 149 static char_type* 150 copy(char_type* __s1, const char_type* __s2, size_t __n) 151 { 152 std::copy(__s2, __s2 + __n, __s1); 153 return __s1; 154 } 155 156 static char_type* 157 assign(char_type* __s, size_t __n, char_type __a) 158 { 159 std::fill_n(__s, __n, __a); 160 return __s; 161 } 162 163 static char_type 164 to_char_type(const int_type& __i) 165 { return char_type::template from(__i); } 166 167 static int_type 168 to_int_type(const char_type& __c) 169 { return char_type::template to<int_type>(__c); } 170 171 static bool 172 eq_int_type(const int_type& __c1, const int_type& __c2) 173 { return __c1 == __c2; } 174 175 static int_type 176 eof() 177 { 178 int_type __r = { -1 }; 179 return __r; 180 } 181 182 static int_type 183 not_eof(const int_type& __c) 184 { return eq_int_type(__c, eof()) ? int_type() : __c; } 185 }; 186 187 _GLIBCXX_END_NAMESPACE_VERSION 188 } // namespace 189 190 #endif 191
