Reimplementing interface

[Stewart Gordon]

Frank Benoit (keinfarbton) wrote:
> Bug http://d.puremagic.com/issues/show_bug.cgi?id=502
> points out: a class that reimplements an interface, needs also to
> reimplement all methods from the interface.
> 
> Currently this means, it is really necessary to do
> 
>   int f( int i ){
>     return super.f( i );
>   }
> 
> I think an alias should do the job.
> 
>   alias SuperClass.f f;
> 
> comments?

I agree.  And I've disputed the excuse for labelling that bug as invalid 
on this basis.

I think the reason for requiring interfaces to be explicitly implemented 
in that very class is that, if you don't watch out, you may end up 
implementing the interface by an inherited method with very different 
semantics.  But if you declare it as an alias in the class that 
implements the interface, then you're showing that you have watched out. 
  And so this should be one way of implementing the interface.

I don't really know what practical uses there are for reimplementing the 
same interface in a derived class, but in any case the same argument for 
allowing this applies.

Stewart.

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