The Non-Virtual Interface idiom in D

["Jérôme M. Berger"]

Michel Fortin wrote:
> I fully support having a way to specify a default implementation for a 
> function in an interface. It might get handy for a few things (like 
> implementing the delegate pattern you see everywhere in Cocoa). But it's 
> a bad replacement for contracts.
> 
	Then what's the difference between an interface and an abstract 
class? I thought that the whole point of interfaces was that you 
couldn't have implementations of the methods so that you had no 
problem choosing an implementation when inheriting from multiple 
interfaces.

		Jerome
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