unitbuf


manipulator function
<ios>
ios_base& unitbuf ( ios_base& str );

Flush buffer after insertions

Sets the unitbuf "format" flag for the str stream.

When the unitbuf flag is set, the associated buffer is flushed after each insertion operation.

This flag can be unset with the nounitbuf manipulator, not forcing flushes after every insertion.

The unitbuf flag is not set in standard streams on initialization.

Parameters

str
Stream object where to apply.
Because this function is a manipulator, it is designed to be used alone with no arguments in conjunction with the insertion (<<) and extraction (>>) operations on streams (see example below).


Return Value

A reference to the stream object.

Example

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// modify unitbuf flag
#include <fstream>
using namespace std;

int main () {
  ofstream outfile ("test.txt");
  outfile << unitbuf <<  "Test " << "file" << endl;
  outfile.close();
  return 0;
}


See also