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