Hello all, I just realized that an empty BIL interface, BOOST_IDL_BEGIN(IAnything) BOOST_IDL_EMPTY(IAnything) has some common ground with: boost::any Where boost::any stores a copy of a value of practical any type for later extraction, IAnything can point to just about anything. void BoostAnyTest() { int x = 5; boost::any a = x; TEST(any_cast<int>(a) == 5); } void AnythingTest() { int x = 5; IAnything a = x; TEST(extract<int>(a) == 5); } void ObjectTests() { BoostAnyTest(); AnythingTest(); } I just thought this could lead to some kind of connection between the libraries. It might be nice to see this in the boost::any namespace, i.e. a boost::any::any_ref. Christopher Diggins Object Oriented Template Library (OOTL) http://www.ootl.org