Re: [Boost-users] [Bind] arity of arbitrary object

-----Original Message----- From: boost-users-bounces@lists.boost.org on behalf of Peter Dimov No, this doesn't quite work. It says that bind( f, _5 ) has arity 1, but the correct answer is 5. Similarly, it says that bind( f, 1, 2 ) has arity 2, while the correct answer is 0. You need something like (pseudocode) arity( _bi::bind_t ) :- max( arity( e ) ) for each e in L arity( X ) :- is_placeholder<X>::value This could be much easier with a bind that uses a fusion tuple as L. :-) ------------ Ok so now the attached version doesn't have the issues which you pointed out. Is there a way (using mpl) to get the max element in a sequence?