char_traits.h

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00001 // Character Traits for use by standard string and iostream -*- C++ -*- 00002 00003 // Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 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 2, 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 // You should have received a copy of the GNU General Public License along 00018 // with this library; see the file COPYING. If not, write to the Free 00019 // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, 00020 // USA. 00021 00022 // As a special exception, you may use this file as part of a free software 00023 // library without restriction. Specifically, if other files instantiate 00024 // templates or use macros or inline functions from this file, or you compile 00025 // this file and link it with other files to produce an executable, this 00026 // file does not by itself cause the resulting executable to be covered by 00027 // the GNU General Public License. This exception does not however 00028 // invalidate any other reasons why the executable file might be covered by 00029 // the GNU General Public License. 00030 00031 // 00032 // ISO C++ 14882: 21 Strings library 00033 // 00034 00040 #ifndef _CPP_BITS_CHAR_TRAITS_H 00041 #define _CPP_BITS_CHAR_TRAITS_H 1 00042 00043 #pragma GCC system_header 00044 00045 #include <cstring> // For memmove, memset, memchr 00046 #include <bits/fpos.h> // For streampos 00047 00048 namespace std 00049 { 00053 template<class _CharT> 00054 struct char_traits 00055 { 00056 typedef _CharT char_type; 00057 // Unsigned as wint_t is unsigned. 00058 typedef unsigned long int_type; 00059 typedef streampos pos_type; 00060 typedef streamoff off_type; 00061 typedef mbstate_t state_type; 00062 00063 static void 00064 assign(char_type& __c1, const char_type& __c2); 00065 00066 static bool 00067 eq(const char_type& __c1, const char_type& __c2); 00068 00069 static bool 00070 lt(const char_type& __c1, const char_type& __c2); 00071 00072 static int 00073 compare(const char_type* __s1, const char_type* __s2, size_t __n); 00074 00075 static size_t 00076 length(const char_type* __s); 00077 00078 static const char_type* 00079 find(const char_type* __s, size_t __n, const char_type& __a); 00080 00081 static char_type* 00082 move(char_type* __s1, const char_type* __s2, size_t __n); 00083 00084 static char_type* 00085 copy(char_type* __s1, const char_type* __s2, size_t __n); 00086 00087 static char_type* 00088 assign(char_type* __s, size_t __n, char_type __a); 00089 00090 static char_type 00091 to_char_type(const int_type& __c); 00092 00093 static int_type 00094 to_int_type(const char_type& __c); 00095 00096 static bool 00097 eq_int_type(const int_type& __c1, const int_type& __c2); 00098 00099 static int_type 00100 eof(); 00101 00102 static int_type 00103 not_eof(const int_type& __c); 00104 }; 00105 00106 00108 template<> 00109 struct char_traits<char> 00110 { 00111 typedef char char_type; 00112 typedef int int_type; 00113 typedef streampos pos_type; 00114 typedef streamoff off_type; 00115 typedef mbstate_t state_type; 00116 00117 static void 00118 assign(char_type& __c1, const char_type& __c2) 00119 { __c1 = __c2; } 00120 00121 static bool 00122 eq(const char_type& __c1, const char_type& __c2) 00123 { return __c1 == __c2; } 00124 00125 static bool 00126 lt(const char_type& __c1, const char_type& __c2) 00127 { return __c1 < __c2; } 00128 00129 static int 00130 compare(const char_type* __s1, const char_type* __s2, size_t __n) 00131 { return memcmp(__s1, __s2, __n); } 00132 00133 static size_t 00134 length(const char_type* __s) 00135 { return strlen(__s); } 00136 00137 static const char_type* 00138 find(const char_type* __s, size_t __n, const char_type& __a) 00139 { return static_cast<const char_type*>(memchr(__s, __a, __n)); } 00140 00141 static char_type* 00142 move(char_type* __s1, const char_type* __s2, size_t __n) 00143 { return static_cast<char_type*>(memmove(__s1, __s2, __n)); } 00144 00145 static char_type* 00146 copy(char_type* __s1, const char_type* __s2, size_t __n) 00147 { return static_cast<char_type*>(memcpy(__s1, __s2, __n)); } 00148 00149 static char_type* 00150 assign(char_type* __s, size_t __n, char_type __a) 00151 { return static_cast<char_type*>(memset(__s, __a, __n)); } 00152 00153 static char_type 00154 to_char_type(const int_type& __c) 00155 { return static_cast<char_type>(__c); } 00156 00157 // To keep both the byte 0xff and the eof symbol 0xffffffff 00158 // from ending up as 0xffffffff. 00159 static int_type 00160 to_int_type(const char_type& __c) 00161 { return static_cast<int_type>(static_cast<unsigned char>(__c)); } 00162 00163 static bool 00164 eq_int_type(const int_type& __c1, const int_type& __c2) 00165 { return __c1 == __c2; } 00166 00167 static int_type 00168 eof() { return static_cast<int_type>(EOF); } 00169 00170 static int_type 00171 not_eof(const int_type& __c) 00172 { return (__c == eof()) ? 0 : __c; } 00173 }; 00174 00175 00176 #ifdef _GLIBCPP_USE_WCHAR_T 00177 template<> 00178 struct char_traits<wchar_t> 00179 { 00180 typedef wchar_t char_type; 00181 typedef wint_t int_type; 00182 typedef streamoff off_type; 00183 typedef wstreampos pos_type; 00184 typedef mbstate_t state_type; 00185 00186 static void 00187 assign(char_type& __c1, const char_type& __c2) 00188 { __c1 = __c2; } 00189 00190 static bool 00191 eq(const char_type& __c1, const char_type& __c2) 00192 { return __c1 == __c2; } 00193 00194 static bool 00195 lt(const char_type& __c1, const char_type& __c2) 00196 { return __c1 < __c2; } 00197 00198 static int 00199 compare(const char_type* __s1, const char_type* __s2, size_t __n) 00200 { return wmemcmp(__s1, __s2, __n); } 00201 00202 static size_t 00203 length(const char_type* __s) 00204 { return wcslen(__s); } 00205 00206 static const char_type* 00207 find(const char_type* __s, size_t __n, const char_type& __a) 00208 { return wmemchr(__s, __a, __n); } 00209 00210 static char_type* 00211 move(char_type* __s1, const char_type* __s2, int_type __n) 00212 { return wmemmove(__s1, __s2, __n); } 00213 00214 static char_type* 00215 copy(char_type* __s1, const char_type* __s2, size_t __n) 00216 { return wmemcpy(__s1, __s2, __n); } 00217 00218 static char_type* 00219 assign(char_type* __s, size_t __n, char_type __a) 00220 { return wmemset(__s, __a, __n); } 00221 00222 static char_type 00223 to_char_type(const int_type& __c) { return char_type(__c); } 00224 00225 static int_type 00226 to_int_type(const char_type& __c) { return int_type(__c); } 00227 00228 static bool 00229 eq_int_type(const int_type& __c1, const int_type& __c2) 00230 { return __c1 == __c2; } 00231 00232 static int_type 00233 eof() { return static_cast<int_type>(WEOF); } 00234 00235 static int_type 00236 not_eof(const int_type& __c) 00237 { return eq_int_type(__c, eof()) ? 0 : __c; } 00238 }; 00239 #endif //_GLIBCPP_USE_WCHAR_T 00240 00241 template<typename _CharT, typename _Traits> 00242 struct _Char_traits_match 00243 { 00244 _CharT _M_c; 00245 _Char_traits_match(_CharT const& __c) : _M_c(__c) { } 00246 00247 bool 00248 operator()(_CharT const& __a) { return _Traits::eq(_M_c, __a); } 00249 }; 00250 } // namespace std 00251 00252 #endif

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