David Abrahams writes: > > Do we have any precedent for ways to find out what the arity and > argument types of an arbitrary function object is (I'm not talking > about function pointers, here, but "functors")?
Given that a functor might support more than one argument set, the only way I can think of is to say "do you support this argument set?" rather than "what argument set do you accept?"; in which case you can use the mechanism implemented in boost.lambda, and in my function composition library, to deduce the return type --- have a member template that takes a typelist representing the arguments you wish to pass, and returns the corresponding return type where that argument set is valid, or something else (such as invalid_argument_set) where it isn't (assuming you want to do something else in the case where it isn't, rather than just abort compilation) Does this give you what you want? Anthony -- Anthony Williams Senior Software Engineer, Beran Instruments Ltd. Remove NOSPAM when replying, for timely response. _______________________________________________ Unsubscribe & other changes: http://lists.boost.org/mailman/listinfo.cgi/boost
