David Abrahams wrote:

They could be made simpler (avoiding a few specializations) if you didn't try to do an nonintrusive example. E.g., this stuff:

template <class Iterator> struct apply; // never defined

template <class Struct, int index> struct apply<foobar<Struct,index> > { ... };

I think intrusive and non-intrusive examples are both needed (maybe starting from an intrusive example). I believe more work needs to be done in the extensibility aspect. This also includes the fusion-converter I proposed sometime ago. I believe the more easier it is to adapt Fusion to real world structures, the better. Regards, -- Joel de Guzman http://www.boost-consulting.com http://spirit.sf.net