On Thursday, 17 May 2012 at 21:09:10 UTC, Jonathan M Davis wrote:
It would still be necessary, because the compiler needs to know
what the
actual return type is. Knowing that the type implements
popFront, front, and
empty isn't enough. It needs to know the actual, physical
layout of the type
to generate the proper code. And when dealing with an
interface, the return
type must be covariant, and unless the types are both classes
and one is
derived from the other (directly or indirectly), they won't be
covariant even
if they have all of the same functions.
- Jonathan M Davis
I felt there is some fundamental problem, otherwise it would have
been implemented already. But couldn't find any myself. Thanks!
