[boost] [type_traits] "member_function_pointer_traits" ?

Dear Boosters, what is the reason for the absence of "member_function_pointer_traits" (or alike) in the type_traits library ? To be precise: is it a design decision or just something not yet implemented ? In the latter case I hereby volunteer for implementing it. I suggest an interface similar to the one of function_traits but with two additional constants for 'const' and 'volatile' qualification of the pointee method, because there is no member function type without the pointer thus making it impossible to use remove_pointer / is_[qualifier] or pass 'Class::member_function' (without the '&', that is) as an argument of parametrized type to a template function. Best regards, Tobias