title: How to disable buffering on a stream?
body: <p>In C, I can easily set a stream to unbuffered I/O:</p>
  
  <pre><code>FILE * f = fopen( "test", "r" );
  setvbuf( f, (char *)NULL, _IONBF, 0 );
  </code></pre>
  
  <p>How would I achieve similarly unbuffered I/O using C++ IOStreams?</p>