I/O

Collaboration diagram for I/O:

Classes
class	__gnu_cxx::stdio_filebuf< _CharT, _Traits >
class	__gnu_cxx::stdio_sync_filebuf< _CharT, _Traits >
class	std::basic_filebuf< _CharT, _Traits >
class	std::basic_fstream< _CharT, _Traits >
class	std::basic_ifstream< _CharT, _Traits >
class	std::basic_ios< _CharT, _Traits >
class	std::basic_iostream< _CharT, _Traits >
class	std::basic_istream< _CharT, _Traits >
class	std::basic_istringstream< _CharT, _Traits, _Alloc >
class	std::basic_ofstream< _CharT, _Traits >
class	std::basic_ostream< _CharT, _Traits >
class	std::basic_ostringstream< _CharT, _Traits, _Alloc >
class	std::basic_streambuf< _CharT, _Traits >
class	std::basic_stringbuf< _CharT, _Traits, _Alloc >
class	std::basic_stringstream< _CharT, _Traits, _Alloc >
class	std::ios_base
class	std::istreambuf_iterator< _CharT, _Traits >
class	std::ostreambuf_iterator< _CharT, _Traits >

Typedefs
typedef basic_filebuf< char >	std::filebuf
typedef basic_fstream< char >	std::fstream
typedef basic_ifstream< char >	std::ifstream
typedef basic_ios< char >	std::ios
typedef basic_iostream< char >	std::iostream
typedef basic_istream< char >	std::istream
typedef basic_istringstream< char >	std::istringstream
typedef basic_ofstream< char >	std::ofstream
typedef basic_ostream< char >	std::ostream
typedef basic_ostringstream< char >	std::ostringstream
typedef basic_streambuf< char >	std::streambuf
typedef basic_stringbuf< char >	std::stringbuf
typedef basic_stringstream< char >	std::stringstream
typedef basic_filebuf< wchar_t >	std::wfilebuf
typedef basic_fstream< wchar_t >	std::wfstream
typedef basic_ifstream< wchar_t >	std::wifstream
typedef basic_ios< wchar_t >	std::wios
typedef basic_iostream< wchar_t >	std::wiostream
typedef basic_istream< wchar_t >	std::wistream
typedef basic_istringstream< wchar_t >	std::wistringstream
typedef basic_ofstream< wchar_t >	std::wofstream
typedef basic_ostream< wchar_t >	std::wostream
typedef basic_ostringstream< wchar_t >	std::wostringstream
typedef basic_streambuf< wchar_t >	std::wstreambuf
typedef basic_stringbuf< wchar_t >	std::wstringbuf
typedef basic_stringstream< wchar_t >	std::wstringstream

Detailed Description

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:

typedef basic_ifstream<char>  ifstream;

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., class ostream;) is not valid ISO C++.

For more specific declarations, see https://gcc.gnu.org/onlinedocs/libstdc++/manual/io.html#std.io.objects

Typedef Documentation

typedef basic_filebuf<char> std::filebuf

Class for char file buffers.

Definition at line 159 of file iosfwd.

typedef basic_fstream<char> std::fstream

Class for char mixed input and output file streams.

Definition at line 168 of file iosfwd.

typedef basic_ifstream<char> std::ifstream

Class for char input file streams.

Definition at line 162 of file iosfwd.

typedef basic_ios<char> std::ios

Base class for char streams.

Definition at line 128 of file iosfwd.

typedef basic_iostream<char> std::iostream

Base class for char mixed input and output streams.

Definition at line 144 of file iosfwd.

typedef basic_istream<char> std::istream

Base class for char input streams.

Definition at line 138 of file iosfwd.

typedef basic_istringstream<char> std::istringstream

Class for char input memory streams.

Definition at line 150 of file iosfwd.

typedef basic_ofstream<char> std::ofstream

Class for char output file streams.

Definition at line 165 of file iosfwd.

typedef basic_ostream<char> std::ostream

Base class for char output streams.

Definition at line 141 of file iosfwd.

typedef basic_ostringstream<char> std::ostringstream

Class for char output memory streams.

Definition at line 153 of file iosfwd.

typedef basic_streambuf<char> std::streambuf

Base class for char buffers.

Definition at line 135 of file iosfwd.

typedef basic_stringbuf<char> std::stringbuf

Class for char memory buffers.

Definition at line 147 of file iosfwd.

typedef basic_stringstream<char> std::stringstream

Class for char mixed input and output memory streams.

Definition at line 156 of file iosfwd.

typedef basic_filebuf<wchar_t> std::wfilebuf

Class for wchar_t file buffers.

Definition at line 199 of file iosfwd.

typedef basic_fstream<wchar_t> std::wfstream

Class for wchar_t mixed input and output file streams.

Definition at line 208 of file iosfwd.

typedef basic_ifstream<wchar_t> std::wifstream

Class for wchar_t input file streams.

Definition at line 202 of file iosfwd.

typedef basic_ios<wchar_t> std::wios

Base class for wchar_t streams.

Definition at line 172 of file iosfwd.

typedef basic_iostream<wchar_t> std::wiostream

Base class for wchar_t mixed input and output streams.

Definition at line 184 of file iosfwd.

typedef basic_istream<wchar_t> std::wistream

Base class for wchar_t input streams.

Definition at line 178 of file iosfwd.

typedef basic_istringstream<wchar_t> std::wistringstream

Class for wchar_t input memory streams.

Definition at line 190 of file iosfwd.

typedef basic_ofstream<wchar_t> std::wofstream

Class for wchar_t output file streams.

Definition at line 205 of file iosfwd.

typedef basic_ostream<wchar_t> std::wostream

Base class for wchar_t output streams.

Definition at line 181 of file iosfwd.

typedef basic_ostringstream<wchar_t> std::wostringstream

Class for wchar_t output memory streams.

Definition at line 193 of file iosfwd.

typedef basic_streambuf<wchar_t> std::wstreambuf

Base class for wchar_t buffers.

Definition at line 175 of file iosfwd.

typedef basic_stringbuf<wchar_t> std::wstringbuf

Class for wchar_t memory buffers.

Definition at line 187 of file iosfwd.

typedef basic_stringstream<wchar_t> std::wstringstream

Class for wchar_t mixed input and output memory streams.

Definition at line 196 of file iosfwd.