To interface or not to interface

Walter Bright newshound1 at
Mon May 24 15:13:38 PDT 2010

Steven Schveighoffer wrote:
> All an interface does is give an abstract representation of functions 
> that are *already there*.  Removing the interface does not remove the 
> functions that implemented the interface.

Then why do interfaces need to be part of the collection component? Why can't 
the user add them if he wants them?

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