[Boost-users] [mpl] erase_key confusion

I expect the following code to compile cleanly. It does not. #include #include #include namespace mpl = boost::mpl; using mpl::_1; using mpl::_2; struct A {}; struct B {}; typedef mpl::set set1; typedef mpl::set set2; BOOST_MPL_ASSERT(( mpl::equal< mpl::erase_key::type, mpl::erase_key::type

)); I'm simply trying to assert that the sets {A,B} and {B,A} have the same elements after A has been removed from both. What am I doing wrong? Thanks, Scott