NSTimer doesn't catch exception when selector is performed

[andre levy]

when NSTimer performs a selector and the selector fires an exception 
nobody catches the exception. this causes the appli to crash.

since we cannot afford to have this behaviour (our customers may write 
code that fires exception) we have to catch the exception and log a 
message. actually Mac OSX does just that.

therefore we do:

- (void) fire
{
  if (_selector == 0)
    {
NS_DURING
      [(NSInvocation*)_target invoke];
NS_HANDLER
	NSLog(@"*** NSTimer ignoring exception '%@' (reason '%@') that raised 
during posting of timer with target %p and selector '%@'",
          [localException name], [localException reason], _target, 
NSStringFromSelector([_target selector]));
NS_ENDHANDLER
    }
  else
    {
NS_DURING
      [_target performSelector: _selector withObject: self];
NS_HANDLER
	NSLog(@"*** NSTimer ignoring exception '%@' (reason '%@') that raised 
during posting of timer with target %p and selector '%@'",
          [localException name], [localException reason], _target, 
NSStringFromSelector(_selector));
NS_ENDHANDLER
    }

...
}

a bit verbose. but I hope you get the idea...

should it be the default behaviour?

thanks a lot!

--andre