On Mon, Mar 10, 2003 at 11:08:23PM +0000, Jos� Fonseca wrote:
> But the function I put in the table _was_ an ordinary function, and
> not a C++ method, and no redirection call would take place with
> inlining. That was the point of the explanation...
Uhm... how do you inline a function call that's going over a function
pointer? Specifically, ask youself what's involved in inlining a
function.
> And yes, I do believe that, with care, C++ won't create a noticeable
> overhead, but there's no point to discuss it, as we can simply
> benchmark it on the end.
There's probably a way to make this fly, but the way you have shown
until now isn't it. You could for example have a dispatch _object_,
that is, you end up calling:
dispatch->BlendFunc(...);
and you can switch the dispatch object. You are still calling the
method thru a pointer. You could probably fix that with some clever
use of function templates but I don't have a clear picture how software
fallbacks could (efficiently) work in that case.
Marcelo
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