Re: [Boost-users] Concept check vs enable_if

I would say don't. It's not friendly to generic code and it sounds

"or constraints" which were left out of C++0x for very good reasons. If you could be more specific about what you're trying to do I might be able to help find a better solution. My first guess is that the answer will be found in

like the use of traits. Basically I want to make a concept which represents class that supports the result_of protocol, ie exposes either a result_type or a result inner class. So my first idea was to see if a given type have either of this inner elements.