1 // POD character, std::char_traits specialization -*- C++ -*- 2 3 // Copyright (C) 2002, 2003, 2004, 2005, 2007, 2009, 2010, 2011 4 // Free Software Foundation, Inc. 5 // 6 // This file is part of the GNU ISO C++ Library. This library is free 7 // software; you can redistribute it and/or modify it under the 8 // terms of the GNU General Public License as published by the 9 // Free Software Foundation; either version 3, or (at your option) 10 // any later version. 11 12 // This library is distributed in the hope that it will be useful, 13 // but WITHOUT ANY WARRANTY; without even the implied warranty of 14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 // GNU General Public License for more details. 16 17 // Under Section 7 of GPL version 3, you are granted additional 18 // permissions described in the GCC Runtime Library Exception, version 19 // 3.1, as published by the Free Software Foundation. 20 21 // You should have received a copy of the GNU General Public License and 22 // a copy of the GCC Runtime Library Exception along with this program; 23 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 24 // <http://www.gnu.org/licenses/>. 25 26 /** @file ext/pod_char_traits.h 27 * This file is a GNU extension to the Standard C++ Library. 28 */ 29 30 // Gabriel Dos Reis <gdr (at) integrable-solutions.net> 31 // Benjamin Kosnik <bkoz (at) redhat.com> 32 33 #ifndef _POD_CHAR_TRAITS_H 34 #define _POD_CHAR_TRAITS_H 1 35 36 #pragma GCC system_header 37 38 #include <string> 39 40 namespace __gnu_cxx _GLIBCXX_VISIBILITY(default) 41 { 42 _GLIBCXX_BEGIN_NAMESPACE_VERSION 43 44 // POD character abstraction. 45 // NB: The char_type parameter is a subset of int_type, as to allow 46 // int_type to properly hold the full range of char_type values as 47 // well as EOF. 48 /// @brief A POD class that serves as a character abstraction class. 49 template<typename V, typename I, typename S = std::mbstate_t> 50 struct character 51 { 52 typedef V value_type; 53 typedef I int_type; 54 typedef S state_type; 55 typedef character<V, I, S> char_type; 56 57 value_type value; 58 59 template<typename V2> 60 static char_type 61 from(const V2& v) 62 { 63 char_type ret = { static_cast<value_type>(v) }; 64 return ret; 65 } 66 67 template<typename V2> 68 static V2 69 to(const char_type& c) 70 { 71 V2 ret = { static_cast<V2>(c.value) }; 72 return ret; 73 } 74 75 }; 76 77 template<typename V, typename I, typename S> 78 inline bool 79 operator==(const character<V, I, S>& lhs, const character<V, I, S>& rhs) 80 { return lhs.value == rhs.value; } 81 82 template<typename V, typename I, typename S> 83 inline bool 84 operator<(const character<V, I, S>& lhs, const character<V, I, S>& rhs) 85 { return lhs.value < rhs.value; } 86 87 _GLIBCXX_END_NAMESPACE_VERSION 88 } // namespace 89 90 namespace std _GLIBCXX_VISIBILITY(default) 91 { 92 _GLIBCXX_BEGIN_NAMESPACE_VERSION 93 94 /// char_traits<__gnu_cxx::character> specialization. 95 template<typename V, typename I, typename S> 96 struct char_traits<__gnu_cxx::character<V, I, S> > 97 { 98 typedef __gnu_cxx::character<V, I, S> char_type; 99 typedef typename char_type::int_type int_type; 100 typedef typename char_type::state_type state_type; 101 typedef fpos<state_type> pos_type; 102 typedef streamoff off_type; 103 104 static void 105 assign(char_type& __c1, const char_type& __c2) 106 { __c1 = __c2; } 107 108 static bool 109 eq(const char_type& __c1, const char_type& __c2) 110 { return __c1 == __c2; } 111 112 static bool 113 lt(const char_type& __c1, const char_type& __c2) 114 { return __c1 < __c2; } 115 116 static int 117 compare(const char_type* __s1, const char_type* __s2, size_t __n) 118 { 119 for (size_t __i = 0; __i < __n; ++__i) 120 if (!eq(__s1[__i], __s2[__i])) 121 return lt(__s1[__i], __s2[__i]) ? -1 : 1; 122 return 0; 123 } 124 125 static size_t 126 length(const char_type* __s) 127 { 128 const char_type* __p = __s; 129 while (__p->value) 130 ++__p; 131 return (__p - __s); 132 } 133 134 static const char_type* 135 find(const char_type* __s, size_t __n, const char_type& __a) 136 { 137 for (const char_type* __p = __s; size_t(__p - __s) < __n; ++__p) 138 if (*__p == __a) 139 return __p; 140 return 0; 141 } 142 143 static char_type* 144 move(char_type* __s1, const char_type* __s2, size_t __n) 145 { 146 return static_cast<char_type*> 147 (__builtin_memmove(__s1, __s2, __n * sizeof(char_type))); 148 } 149 150 static char_type* 151 copy(char_type* __s1, const char_type* __s2, size_t __n) 152 { 153 std::copy(__s2, __s2 + __n, __s1); 154 return __s1; 155 } 156 157 static char_type* 158 assign(char_type* __s, size_t __n, char_type __a) 159 { 160 std::fill_n(__s, __n, __a); 161 return __s; 162 } 163 164 static char_type 165 to_char_type(const int_type& __i) 166 { return char_type::template from(__i); } 167 168 static int_type 169 to_int_type(const char_type& __c) 170 { return char_type::template to<int_type>(__c); } 171 172 static bool 173 eq_int_type(const int_type& __c1, const int_type& __c2) 174 { return __c1 == __c2; } 175 176 static int_type 177 eof() 178 { 179 int_type __r = { -1 }; 180 return __r; 181 } 182 183 static int_type 184 not_eof(const int_type& __c) 185 { return eq_int_type(__c, eof()) ? int_type() : __c; } 186 }; 187 188 _GLIBCXX_END_NAMESPACE_VERSION 189 } // namespace 190 191 #endif 192
