#include <iostream>

struct A    { void reset() { std::cout << "reset A" << std::endl; } };
struct B    { void reset() { std::cout << "reset B" << std::endl; } };

struct X :public A{};

template <typename T, typename R, typename BT>
typename std::enable_if<std::is_base_of<BT, T>::value, R>::type
call_if_possible(T & obj, R(BT::*mf)())
{
	return (obj.*mf)();
}

template <typename T, typename R, typename BT>
typename std::enable_if<!std::is_base_of<BT, T>::value, R>::type
call_if_possible(T & obj, R(BT::*mf)()) { }

int main()
{
	X x;

	call_if_possible(x, &A::reset);
	call_if_possible(x, &B::reset);
}