C++ In a Nutshell

Name

_IONBF macro — No buffering

Synopsis

const int _IONBF
               

When passed as the mode parameter to setvbuf, the _IONBF macro disables the buffering of an open file. Characters are read or written as soon as possible, without buffering. The _IONBF macro expands to a constant integer.

Support for unbuffered streams is implementation-dependent. For example, a host operating system might line buffer input from a terminal, even if a program requests unbuffered input.

See Also

setvbuf function