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The C and C++ Include Header Files
/usr/include/c++/13/iosfwd
$ cat -n /usr/include/c++/13/iosfwd 1 // <iosfwd> Forward declarations -*- C++ -*- 2 3 // Copyright (C) 1997-2023 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 include/iosfwd 26 * This is a Standard C++ Library header. 27 */ 28 29 // 30 // ISO C++ 14882: 27.2 Forward declarations 31 // 32 33 #ifndef _GLIBCXX_IOSFWD 34 #define _GLIBCXX_IOSFWD 1 35 36 #pragma GCC system_header 37 38 #include <bits/requires_hosted.h> // iostreams 39 40 #include <bits/c++config.h> 41 #include <bits/stringfwd.h> // For string forward declarations. 42 #include <bits/postypes.h> 43 44 namespace std _GLIBCXX_VISIBILITY(default) 45 { 46 _GLIBCXX_BEGIN_NAMESPACE_VERSION 47 48 /** 49 * @defgroup io I/O 50 * 51 * Nearly all of the I/O classes are parameterized on the type of 52 * characters they read and write. (The major exception is ios_base at 53 * the top of the hierarchy.) This is a change from pre-Standard 54 * streams, which were not templates. 55 * 56 * For ease of use and compatibility, all of the basic_* I/O-related 57 * classes are given typedef names for both of the builtin character 58 * widths (wide and narrow). The typedefs are the same as the 59 * pre-Standard names, for example: 60 * 61 * @code 62 * typedef basic_ifstream<char> ifstream; 63 * @endcode 64 * 65 * Because properly forward-declaring these classes can be difficult, you 66 * should not do it yourself. Instead, include the <iosfwd> 67 * header, which contains only declarations of all the I/O classes as 68 * well as the typedefs. Trying to forward-declare the typedefs 69 * themselves (e.g., <code>class ostream;</code>) is not valid ISO C++. 70 * 71 * For more specific declarations, see 72 * https://gcc.gnu.org/onlinedocs/libstdc++/manual/io.html#std.io.objects 73 * 74 * @{ 75 */ 76 class ios_base; 77 78 template<typename _CharT, typename _Traits = char_traits<_CharT> > 79 class basic_ios; 80 81 template<typename _CharT, typename _Traits = char_traits<_CharT> > 82 class basic_streambuf; 83 84 template<typename _CharT, typename _Traits = char_traits<_CharT> > 85 class basic_istream; 86 87 template<typename _CharT, typename _Traits = char_traits<_CharT> > 88 class basic_ostream; 89 90 template<typename _CharT, typename _Traits = char_traits<_CharT> > 91 class basic_iostream; 92 93 94 _GLIBCXX_BEGIN_NAMESPACE_CXX11 95 96 template<typename _CharT, typename _Traits = char_traits<_CharT>, 97 typename _Alloc = allocator<_CharT> > 98 class basic_stringbuf; 99 100 template<typename _CharT, typename _Traits = char_traits<_CharT>, 101 typename _Alloc = allocator<_CharT> > 102 class basic_istringstream; 103 104 template<typename _CharT, typename _Traits = char_traits<_CharT>, 105 typename _Alloc = allocator<_CharT> > 106 class basic_ostringstream; 107 108 template<typename _CharT, typename _Traits = char_traits<_CharT>, 109 typename _Alloc = allocator<_CharT> > 110 class basic_stringstream; 111 112 _GLIBCXX_END_NAMESPACE_CXX11 113 114 template<typename _CharT, typename _Traits = char_traits<_CharT> > 115 class basic_filebuf; 116 117 template<typename _CharT, typename _Traits = char_traits<_CharT> > 118 class basic_ifstream; 119 120 template<typename _CharT, typename _Traits = char_traits<_CharT> > 121 class basic_ofstream; 122 123 template<typename _CharT, typename _Traits = char_traits<_CharT> > 124 class basic_fstream; 125 126 template<typename _CharT, typename _Traits = char_traits<_CharT> > 127 class istreambuf_iterator; 128 129 template<typename _CharT, typename _Traits = char_traits<_CharT> > 130 class ostreambuf_iterator; 131 132 133 /// Base class for @c char streams. 134 typedef basic_ios<char> ios; 135 136 /// Base class for @c char buffers. 137 typedef basic_streambuf<char> streambuf; 138 139 /// Base class for @c char input streams. 140 typedef basic_istream<char> istream; 141 142 /// Base class for @c char output streams. 143 typedef basic_ostream<char> ostream; 144 145 /// Base class for @c char mixed input and output streams. 146 typedef basic_iostream<char> iostream; 147 148 /// Class for @c char memory buffers. 149 typedef basic_stringbuf<char> stringbuf; 150 151 /// Class for @c char input memory streams. 152 typedef basic_istringstream<char> istringstream; 153 154 /// Class for @c char output memory streams. 155 typedef basic_ostringstream<char> ostringstream; 156 157 /// Class for @c char mixed input and output memory streams. 158 typedef basic_stringstream<char> stringstream; 159 160 /// Class for @c char file buffers. 161 typedef basic_filebuf<char> filebuf; 162 163 /// Class for @c char input file streams. 164 typedef basic_ifstream<char> ifstream; 165 166 /// Class for @c char output file streams. 167 typedef basic_ofstream<char> ofstream; 168 169 /// Class for @c char mixed input and output file streams. 170 typedef basic_fstream<char> fstream; 171 172 #ifdef _GLIBCXX_USE_WCHAR_T 173 /// Base class for @c wchar_t streams. 174 typedef basic_ios<wchar_t> wios; 175 176 /// Base class for @c wchar_t buffers. 177 typedef basic_streambuf<wchar_t> wstreambuf; 178 179 /// Base class for @c wchar_t input streams. 180 typedef basic_istream<wchar_t> wistream; 181 182 /// Base class for @c wchar_t output streams. 183 typedef basic_ostream<wchar_t> wostream; 184 185 /// Base class for @c wchar_t mixed input and output streams. 186 typedef basic_iostream<wchar_t> wiostream; 187 188 /// Class for @c wchar_t memory buffers. 189 typedef basic_stringbuf<wchar_t> wstringbuf; 190 191 /// Class for @c wchar_t input memory streams. 192 typedef basic_istringstream<wchar_t> wistringstream; 193 194 /// Class for @c wchar_t output memory streams. 195 typedef basic_ostringstream<wchar_t> wostringstream; 196 197 /// Class for @c wchar_t mixed input and output memory streams. 198 typedef basic_stringstream<wchar_t> wstringstream; 199 200 /// Class for @c wchar_t file buffers. 201 typedef basic_filebuf<wchar_t> wfilebuf; 202 203 /// Class for @c wchar_t input file streams. 204 typedef basic_ifstream<wchar_t> wifstream; 205 206 /// Class for @c wchar_t output file streams. 207 typedef basic_ofstream<wchar_t> wofstream; 208 209 /// Class for @c wchar_t mixed input and output file streams. 210 typedef basic_fstream<wchar_t> wfstream; 211 #endif 212 213 #if __cplusplus >= 202002L && _GLIBCXX_USE_CXX11_ABI 214 template<typename _CharT, typename _Traits = char_traits<_CharT>, 215 typename _Allocator = allocator<_CharT>> 216 class basic_syncbuf; 217 template<typename _CharT, typename _Traits = char_traits<_CharT>, 218 typename _Allocator = allocator<_CharT>> 219 class basic_osyncstream; 220 221 using syncbuf = basic_syncbuf<char>; 222 using osyncstream = basic_osyncstream<char>; 223 224 #ifdef _GLIBCXX_USE_WCHAR_T 225 using wsyncbuf = basic_syncbuf<wchar_t>; 226 using wosyncstream = basic_osyncstream<wchar_t>; 227 #endif 228 #endif // C++20 && CXX11_ABI 229 230 #if __cplusplus > 202002L 231 template<typename _CharT, typename _Traits = char_traits<_CharT>> 232 class basic_spanbuf; 233 template<typename _CharT, typename _Traits = char_traits<_CharT>> 234 class basic_ispanstream; 235 template<typename _CharT, typename _Traits = char_traits<_CharT>> 236 class basic_ospanstream; 237 template<typename _CharT, typename _Traits = char_traits<_CharT>> 238 class basic_spanstream; 239 240 using spanbuf = basic_spanbuf<char>; 241 using ispanstream = basic_ispanstream<char>; 242 using ospanstream = basic_ospanstream<char>; 243 using spanstream = basic_spanstream<char>; 244 245 #ifdef _GLIBCXX_USE_WCHAR_T 246 using wspanbuf = basic_spanbuf<wchar_t>; 247 using wispanstream = basic_ispanstream<wchar_t>; 248 using wospanstream = basic_ospanstream<wchar_t>; 249 using wspanstream = basic_spanstream<wchar_t>; 250 #endif 251 #endif // C++23 252 253 /** @} */ 254 255 _GLIBCXX_END_NAMESPACE_VERSION 256 } // namespace 257 258 #endif /* _GLIBCXX_IOSFWD */
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