[boost] [bind][function_types] Why do bind objects not have an ::arity, ... interface ?

Hi, I want to use a partial template specialisation which is selected on basis of the arity of a bind function object type. Event more, I'd like to access the ::arg1_type, etc types of a bind object type. Why is this not part of the boost::bind or lambda::bind interface ? I thought solving it with the (to be accepted) function_types::function_type_arity<BoundType>::type::value, but the latest version of function_types does not 'support' inspection of bound object types. Other library writers must have felt a need for this interface as well ? Or am I missing something ? With kind regards, Peter Soetens -- Peter Soetens -- FMTC -- <http://www.fmtc.be>