I/O Forward Declarations


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 http://gcc.gnu.org/onlinedocs/libstdc++/27_io/howto.html#10

Typedefs


Typedef Documentation

typedef basic_filebuf<char> filebuf
 

One of the I/O forward declarations .

Definition at line 144 of file iosfwd.

typedef basic_fstream<char> fstream
 

One of the I/O forward declarations .

Definition at line 147 of file iosfwd.

typedef basic_ifstream<char> ifstream
 

One of the I/O forward declarations .

Definition at line 145 of file iosfwd.

typedef basic_ios<char> ios
 

One of the I/O forward declarations .

Definition at line 135 of file iosfwd.

typedef basic_iostream<char> iostream
 

One of the I/O forward declarations .

Definition at line 139 of file iosfwd.

typedef basic_istream<char> istream
 

One of the I/O forward declarations .

Definition at line 137 of file iosfwd.

typedef basic_istringstream<char> istringstream
 

One of the I/O forward declarations .

Definition at line 141 of file iosfwd.

typedef basic_ofstream<char> ofstream
 

One of the I/O forward declarations .

Definition at line 146 of file iosfwd.

typedef basic_ostream<char> ostream
 

One of the I/O forward declarations .

Definition at line 138 of file iosfwd.

typedef basic_ostringstream<char> ostringstream
 

One of the I/O forward declarations .

Definition at line 142 of file iosfwd.

typedef basic_streambuf<char> streambuf
 

One of the I/O forward declarations .

Definition at line 136 of file iosfwd.

typedef basic_stringbuf<char> stringbuf
 

One of the I/O forward declarations .

Definition at line 140 of file iosfwd.

typedef basic_stringstream<char> stringstream
 

One of the I/O forward declarations .

Definition at line 143 of file iosfwd.

typedef basic_filebuf<wchar_t> wfilebuf
 

One of the I/O forward declarations .

Definition at line 159 of file iosfwd.

typedef basic_fstream<wchar_t> wfstream
 

One of the I/O forward declarations .

Definition at line 162 of file iosfwd.

typedef basic_ifstream<wchar_t> wifstream
 

One of the I/O forward declarations .

Definition at line 160 of file iosfwd.

typedef basic_ios<wchar_t> wios
 

One of the I/O forward declarations .

Definition at line 150 of file iosfwd.

typedef basic_iostream<wchar_t> wiostream
 

One of the I/O forward declarations .

Definition at line 154 of file iosfwd.

typedef basic_istream<wchar_t> wistream
 

One of the I/O forward declarations .

Definition at line 152 of file iosfwd.

typedef basic_istringstream<wchar_t> wistringstream
 

One of the I/O forward declarations .

Definition at line 156 of file iosfwd.

typedef basic_ofstream<wchar_t> wofstream
 

One of the I/O forward declarations .

Definition at line 161 of file iosfwd.

typedef basic_ostream<wchar_t> wostream
 

One of the I/O forward declarations .

Definition at line 153 of file iosfwd.

typedef basic_ostringstream<wchar_t> wostringstream
 

One of the I/O forward declarations .

Definition at line 157 of file iosfwd.

typedef basic_streambuf<wchar_t> wstreambuf
 

One of the I/O forward declarations .

Definition at line 151 of file iosfwd.

typedef basic_stringbuf<wchar_t> wstringbuf
 

One of the I/O forward declarations .

Definition at line 155 of file iosfwd.

typedef basic_stringstream<wchar_t> wstringstream
 

One of the I/O forward declarations .

Definition at line 158 of file iosfwd.


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