• CONST : tag::Internal::forward_const< A, B > , tag::Internal::forward_const< const A *, B > , tag::Internal::forward_const< A *, B > , tag::Internal::forward_const< const A &, B > , tag::Internal::forward_const< A &, B > , tag::Internal::forward_const< const A, B >
• elements : tag::T_list< C, D >