Template template partial specialization failure: "expected a class template"

Question

This example code generates expected a class template, got std::pair <_T1, _T2>. I tried using struct Struct <std::pair> {};, but then parameters T and M become undeducible. How to avoid this?

    template <template <class...> class>
    struct Struct {};

    template <class T, class M>
    struct Struct <std::pair <T, M>> {};

Answer 1

Depending of what you want

template <template <class...> class>
struct Struct {};

template <>
struct Struct <std::pair>
{
    // Specialization
};

or

template <typename> struct Struct {};

template <typename First, typename Second>
struct Struct <std::pair<First, Second>>
{
    // Specialization
};