AMDG I'd like to request a formal review of the TypeErasure library that I've posted about several times before here. The TypeErasure library is a generalization of boost::any and boost::function. It allows easy composition of arbitrary type erased operators. As an example of basic usage, we can simulate Boost.Any: any<mpl::vector<copy_constructible<>, typeid_<> > > x(10); int i = any_cast<int>(x); // i == 10 The library is available in the Boost Sandbox at http://svn.boost.org/svn/boost/sandbox/type_erasure/ You can download archives with pre-built documentation from http://sourceforge.net/projects/steven-watanabe.u/files/ Online documentation can be found here: http://steven_watanabe.users.sourceforge.net/type_erasure/libs/type_erasure/ In Christ, Steven Watanabe