Check if a class has a member function of a given signature

Question

I\'m asking for a template trick to detect if a class has a specific member function of a given signature.

The problem is similar to the one cited here http://www.go

Answer 1

Okay. Second try. It's okay if you don't like this one either, I'm looking for more ideas.

Herb Sutter's article talks about traits. So you can have a traits class whose default instantiation has the fallback behaviour, and for each class where your member function exists, then the traits class is specialised to invoke the member function. I believe Herb's article mentions a technique to do this so that it doesn't involve lots of copying and pasting.

Like I said, though, perhaps you don't want the extra work involved with "tagging" classes that do implement that member. In which case, I'm looking at a third solution....