Pointer to class member as a template parameter

In c++17, with the addition of auto in template arguments (P0127), I think you can now do:

template<auto value>
struct MyStruct {};

template<typename Class, typename Result, Result Class::* value>
struct MyStruct<value> {
    // add members using Class, Result, and value here
    using containing_type = Class;
};

typename MyStruct<&Something::theotherthing>::containing_type x = Something();