I've been Boost.Parameter a bit by now and I have some usability feedback. There is one thing that currently bugs be a bit, the type defined by parameter::binding. All my uses so far have been of the form: typedef typename boost::remove_reference< boost::remove_const< boost::parameter::binding<ArgPack,tag::something>::type >::type >::type something_t; something_t s = args[something]; Or equivalent thereof. So every use I have I end up removing the ref and const because I'm really interested in the original type, and hence want to make a copy. Now I understand the rational outlined in "Eliminating Copies" <http://www.boost.org/libs/parameter/doc/html/index.html#eliminating-copies>. But I think that isn't enough of a justification for dirtying up the user interface, as above. I'd rather that the binding type where the value type so that one would have: typedef typename boost::parameter::binding<ArgPack,tag::something>::type something_t; something_t s = args[something]; Having it that way one still has the option of more naturally using the reference type as; something_t const & q = args[something]; And possibly also providing the container standard binding::value_type, and binding::const_reference. -- -- Grafik - Don't Assume Anything -- Redshift Software, Inc. - http://redshift-software.com -- rrivera/acm.org - grafik/redshift-software.com -- 102708583/icq - grafikrobot/aim - grafikrobot/yahoo