"David Abrahams" <[EMAIL PROTECTED]> wrote in message news:[EMAIL PROTECTED] > [...] > Lambda "adds the type" for cases like std::vector<_1>. > Metafunction classes, though, are supposed to be the super- > efficient way to do things, so having the library perform extra > template instantiations to detect the nested ::type would > probably not be appropriate there.
Ok, that's good to know. It looks like the policy adaptor is causing longer compile times, so converting to metafunction classes should actually improve that? > BTW, normally, you might: > > struct Policy > { > template <class P> > struct apply > { > typename some_other_class type; > }; > }; > > if nothing else, just to cut down on symbol size (you don't want > to see Policy::apply<...> in your error messages when it could > be some_other_class<...>). I guess I don't understand what the nested type is for when you aren't really doing a meta-computation, so I don't know what an appropriate type for "some_other_class" would be. Are you saying it can be any arbitrary type at all, since I'm not using the "metafunction result"? And that I should make it descriptive so that I don't just see a bunch of references to ::apply (which is going to get annoying when you have problems in more than one policy)? Dave _______________________________________________ Unsubscribe & other changes: http://lists.boost.org/mailman/listinfo.cgi/boost