A question about DbC

[Jonathan M Davis]

On Saturday 09 October 2010 08:39:30 bearophile wrote:
> J. Berger:
> > This is more or less what Jonathan said in his last post.
> 
> You are right, if the state isn't changed between two method calls, there's
> no point in calling the invariant two times after the method call and
> before the next method call.

Yes, the problem creeps in because public methods are not necessarily the only 
way to alter the state of an object. Running the invariant before the function 
is run is actually a good catch on Walter's part. I wouldn't have thought of it 
precisely because it wouldn't be necessary if the only way to alter an object is 
through it's public methods (and that's often how classe/structs are written).

- Jonathan M Davis