// <iosfwd> Forward declarations -*- C++ -*- // Copyright (C) 1997-2020 Free Software Foundation, Inc. // // This file is part of the GNU ISO C++ Library. This library is free // software; you can redistribute it and/or modify it under the // terms of the GNU General Public License as published by the // Free Software Foundation; either version 3, or (at your option) // any later version. // This library is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // Under Section 7 of GPL version 3, you are granted additional // permissions described in the GCC Runtime Library Exception, version // 3.1, as published by the Free Software Foundation. // You should have received a copy of the GNU General Public License and // a copy of the GCC Runtime Library Exception along with this program; // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see // <http://www.gnu.org/licenses/>. /** @file include/iosfwd * This is a Standard C++ Library header. */ // // ISO C++ 14882: 27.2 Forward declarations // #ifndef _GLIBCXX_IOSFWD #define _GLIBCXX_IOSFWD 1 #pragma GCC system_header #include <bits/c++config.h> #include <bits/stringfwd.h> // For string forward declarations. #include <bits/postypes.h> namespace std _GLIBCXX_VISIBILITY(default) { _GLIBCXX_BEGIN_NAMESPACE_VERSION /** * @defgroup io I/O * * Nearly all of the I/O classes are parameterized on the type of * characters they read and write. (The major exception is ios_base at * the top of the hierarchy.) This is a change from pre-Standard * streams, which were not templates. * * For ease of use and compatibility, all of the basic_* I/O-related * classes are given typedef names for both of the builtin character * widths (wide and narrow). The typedefs are the same as the * pre-Standard names, for example: * * @code * typedef basic_ifstream<char> ifstream; * @endcode * * Because properly forward-declaring these classes can be difficult, you * should not do it yourself. Instead, include the <iosfwd> * header, which contains only declarations of all the I/O classes as * well as the typedefs. Trying to forward-declare the typedefs * themselves (e.g., <code>class ostream;</code>) is not valid ISO C++. * * For more specific declarations, see * https://gcc.gnu.org/onlinedocs/libstdc++/manual/io.html#std.io.objects * * @{ */ class ios_base; template<typename _CharT, typename _Traits = char_traits<_CharT> > class basic_ios; template<typename _CharT, typename _Traits = char_traits<_CharT> > class basic_streambuf; template<typename _CharT, typename _Traits = char_traits<_CharT> > class basic_istream; template<typename _CharT, typename _Traits = char_traits<_CharT> > class basic_ostream; template<typename _CharT, typename _Traits = char_traits<_CharT> > class basic_iostream; _GLIBCXX_BEGIN_NAMESPACE_CXX11 template<typename _CharT, typename _Traits = char_traits<_CharT>, typename _Alloc = allocator<_CharT> > class basic_stringbuf; template<typename _CharT, typename _Traits = char_traits<_CharT>, typename _Alloc = allocator<_CharT> > class basic_istringstream; template<typename _CharT, typename _Traits = char_traits<_CharT>, typename _Alloc = allocator<_CharT> > class basic_ostringstream; template<typename _CharT, typename _Traits = char_traits<_CharT>, typename _Alloc = allocator<_CharT> > class basic_stringstream; _GLIBCXX_END_NAMESPACE_CXX11 template<typename _CharT, typename _Traits = char_traits<_CharT> > class basic_filebuf; template<typename _CharT, typename _Traits = char_traits<_CharT> > class basic_ifstream; template<typename _CharT, typename _Traits = char_traits<_CharT> > class basic_ofstream; template<typename _CharT, typename _Traits = char_traits<_CharT> > class basic_fstream; template<typename _CharT, typename _Traits = char_traits<_CharT> > class istreambuf_iterator; template<typename _CharT, typename _Traits = char_traits<_CharT> > class ostreambuf_iterator; /// Base class for @c char streams. typedef basic_ios<char> ios; /// Base class for @c char buffers. typedef basic_streambuf<char> streambuf; /// Base class for @c char input streams. typedef basic_istream<char> istream; /// Base class for @c char output streams. typedef basic_ostream<char> ostream; /// Base class for @c char mixed input and output streams. typedef basic_iostream<char> iostream; /// Class for @c char memory buffers. typedef basic_stringbuf<char> stringbuf; /// Class for @c char input memory streams. typedef basic_istringstream<char> istringstream; /// Class for @c char output memory streams. typedef basic_ostringstream<char> ostringstream; /// Class for @c char mixed input and output memory streams. typedef basic_stringstream<char> stringstream; /// Class for @c char file buffers. typedef basic_filebuf<char> filebuf; /// Class for @c char input file streams. typedef basic_ifstream<char> ifstream; /// Class for @c char output file streams. typedef basic_ofstream<char> ofstream; /// Class for @c char mixed input and output file streams. typedef basic_fstream<char> fstream; #ifdef _GLIBCXX_USE_WCHAR_T /// Base class for @c wchar_t streams. typedef basic_ios<wchar_t> wios; /// Base class for @c wchar_t buffers. typedef basic_streambuf<wchar_t> wstreambuf; /// Base class for @c wchar_t input streams. typedef basic_istream<wchar_t> wistream; /// Base class for @c wchar_t output streams. typedef basic_ostream<wchar_t> wostream; /// Base class for @c wchar_t mixed input and output streams. typedef basic_iostream<wchar_t> wiostream; /// Class for @c wchar_t memory buffers. typedef basic_stringbuf<wchar_t> wstringbuf; /// Class for @c wchar_t input memory streams. typedef basic_istringstream<wchar_t> wistringstream; /// Class for @c wchar_t output memory streams. typedef basic_ostringstream<wchar_t> wostringstream; /// Class for @c wchar_t mixed input and output memory streams. typedef basic_stringstream<wchar_t> wstringstream; /// Class for @c wchar_t file buffers. typedef basic_filebuf<wchar_t> wfilebuf; /// Class for @c wchar_t input file streams. typedef basic_ifstream<wchar_t> wifstream; /// Class for @c wchar_t output file streams. typedef basic_ofstream<wchar_t> wofstream; /// Class for @c wchar_t mixed input and output file streams. typedef basic_fstream<wchar_t> wfstream; #endif /** @} */ _GLIBCXX_END_NAMESPACE_VERSION } // namespace #endif /* _GLIBCXX_IOSFWD */