#include <memory>
#include <iostream>
#include <functional>
 
struct A: std::enable_shared_from_this<A> {
 
	template <typename... Args>
	std::function<void(Args...)> functor_from_this(void (A::*method)(Args...)) {
	    return [=, obj = shared_from_this()](Args... args) {
	      ((*obj).*method)(args...);
	    };
	}
 
	void foo(int) { std::cout << "foo" << '\n'; }
	void bar() { std::cout << "bar" << '\n'; }
};
 
int main()
{
  auto a = std::make_shared<A>();
 
  auto f = a->functor_from_this(&A::foo);
  auto b = a->functor_from_this(&A::bar);
 
  f(1);
  b();
}

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