Christopher Currie wrote:
The differences between
{ scoped_lock l( m ); }
and
{ scoped_timed_lock l( m, t ); }
are much more descriptive me than
{ scoped_lock( m ); }
{ scoped_lock( m, t ); }
The "unified" timed lock case is { scoped_lock l( m, false ); if( l.timed_lock( t ) ) { // do stuff } else { // what do we do here? presumably either: // setup for unbounded wait l.lock(); // do stuff // or signal failure } } The scoped_timed_lock use case also needs to eventually contain an if( l ) statement; you can't do much if you don't know whether your timed lock succeeded. One might also argue that a separate scoped_timed_lock makes accidentally omitting the if() statement more likely and harder to spot. But it's hard to tell without real use cases.