Is there any way of detecting arbitrary template classes that mix types and non-types?

Question

Is there any way of detecting whether a class is a normal type or is an instantiation of a template type (meta type) which may include non-type parameters?

Answer 1

I guess it is not possible.

Anyway, you can use the other way around and let N be deduced:

template<class, class> struct MixedFoo;
template<class C, int N> struct MixedFoo<C, std::integral_constant<int, N>>{};

Now, this returns true as expected:

 std::cout << is_template<MixedFoo>() << std::endl; // fails here

Of course, you won't be able anymore to use MixedFoo as MixedFoo<int, 2>, so I'm not sure it's worth it.

Answer 2

No, there is not.

Note that template classes are not classes themselves. They are templates for classes.