templates

[Ellery Newcomer]

On 04/19/2010 02:16 PM, Steven Schveighoffer wrote:
>
> What you are looking for is a conversion from compile-time interface to
> runtime interface. The only drawback is, you can't go backwards (from a
> runtime interface to a compile-time).

That hurts. The thing is, I'm eventually going to need to get that T 
back so I can access the non-common parts of it.

The T types already correspond to an enum, so the interface could look like

interface IW{
   Type type();
   int foo(int);
}

then whenever I want T, I can just test type and perform a cast.

Now I'm thinking of how to express that mapping in a centralized 
function or template or whatever, and I think I'm back where I started. 
Oh well. I'm probably going to have to write out each case longhand anyways.

It probably isn't important, but aren't dynamic casts rather expensive?