>  I think I haven't made myself clear enough. enable_if
>  controls whether a given function enters (or not) into the overload
>  resolution set of a function name for a given type.
>  What I'm talking about is an utility that determines
>  if a certain member function of a type does exist. Something like
> 
>  has_mem_fn<T,void (T::*)(T&), &T::swap>::type
> 
>  evaluating to true iff T has such a swap method. As I'm writing this,
>  seems to me this could only be achieved with some macro
>  machinery.

Correct, one would have to define a macro that generated the template
meta-function specifically for the member function you're testing for, I was
just so surprised that this was actually possible that I just had to post
what seemed like a semi-obvious solution to the swap issue.

John.


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