• terranium <spam here.lot> May 08 2008
• BCS <ao pathlink.com> May 08 2008

BCS Wrote:

 Thinking about it, I can't recall ever casting to a derived type where a 
 failed cast was an indication of a bug.



 a little sugar for the other way might be even handier

Reply to terranium,

 BCS Wrote:
 
 Thinking about it, I can't recall ever casting to a derived type
 where a failed cast was an indication of a bug.
 




Ok, some some people use then one way, I use them another. That doesn't prove 
that they your proposal is better (or worse) than the current way.

 When a function receives unexpected input it's
 a bug.
 


That's irrelevant. What I'm saying is that in every case I know of where 
I have used such a cast, the cast failing was /not/ unexpected. It was mealy 
a legitimate and /expected/ "no" answer to the question "is a's type B?"