where to find Implements!

[BLS]

On 30/09/2010 00:40, Jonathan M Davis wrote:
> hich has the appropriate methods will work for any function that
> requires a particular API on the type or types that it's dealing with. There's
> no need to have any interfaces. They just work if they have the correct API and
> don't work if they don't. The isRandomAccessRange() template and its friends are
> used in template constraints to improve the error messages you get when a type
> doesn't have the correct API, but they aren't strictly-speaking necessary.
>

Thanks you for taking the time to explain, Jonathan!
It seems however, that these template constraints are just made for 
ranges. I maybe wrong but I can't see a general purpose value. I am also 
not able to see why an additional vtable entry is necessary to do 
ordinary  /implements/ validation work. (Finally it is just a contract, 
which Mr compiler should negotiate)

Bjoern