[Boost-users] Comparing two mpl::vector types

Hello all, Can anyone give me a hint on how to call a functor on the differences of two same size mpl::vector types? For example, given: typedef boost::mpl::vector<int, char, short, double> v0_type; typedef boost::mpl::vector<int, int, short, std::string> v1_type; We can see that the second and third elements don't match, so I wish to call a functor twice, with the following signature: struct SomeFunctor { template <typename T, typename U> void operator()(T t, U u) const { // do something nice here } }; In this example, functor would be called twice: once with [T=char, U=int] and another with [T=short, U=std::string], along with their values. Thanks for any light, Rodrigo