Daniel and I are working on getting the Named Parameter Library up to the standards requested as part of its review. Over the past few months I realized I also needed "unnamed parameters" (which have no definite order and are discriminated by type), and it made sense to extend the library in that direction. There's also a need for unnamed (and maybe even named) template parameters, and all of these facilities can use a lot of code in common with what we've already got. I think it makes sense to just call this library Boost.Parameter and put it in namespace boost::parameters. I thought it made sense to give people a chance to object, just in case. But everyone loves this idea, right? ;-) -- Dave Abrahams Boost Consulting www.boost-consulting.com