#include <iostream>
#include <functional>
 
struct Bar {
    int z;
 
	Bar(int z) : z(z) {}
 
	void add(int x, int y) { std::cout << x + y + z << std::endl; }
};
 
template <typename T, typename... Arguments>
struct Foo {
	std::function<void(T&, Arguments ...)> f;
 
	template <typename F> Foo(F&& f) : f(std::forward<F>(f)) {}
 
	void execute(Arguments ... args) {
		T c(2);
		f(c, args ...);
	}
};
 
int main() {
	auto b = Foo<Bar, int, int>(&Bar::add);
	b.execute(4, 5);
 
	return 0;
}

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