RE: [GD-General] Multiple Inheritance and RTTI

[Gareth L. <GL...@cl...>]

> But I asked for a real example (read taken from a real 
> project) of using
> (not implementing) the QI pattern, an example that demonstrates the
> superiority of QI over the alternatives.

Sorry, missunderstood. What are the alternatives that you want to compare it
with ? Internet explorer is an example I guess.

> FWIW, for the QI implementation, I prefer a 
> dynamic_cast-style interface:
> 
> if(IRenderable * p = queryInterface<IRenderable>(q))
> {
> // do stuff
> }

There are pros and cons to that. I prefer returning an error code like
HRESULT because the reason for the failure could be important. But it's a
matter of taste

> (when I feel like reinventing dynamic_cast at all, that is.)

COM isn't just a RTTI replacement. I personally use dynamic_cast in some of
my projects, but not as a way to build a concrete class out of interfaces.

YMMV I guess.