A way of checking if a class is derived from a template

gistfile1.cpp

template <typename A, typename B>
class myclass 
{};

template <typename T>
struct is_myclass
{
    struct yes { char c; };
    struct no { char c[2]; };

    template <typename A, typename B>
    static yes check(myclass<A, B>*);
    static no check(...);

    static const bool value = sizeof(check(static_cast<T*>(nullptr))) == sizeof(yes);
};