#include <type_traits>
#include <iostream>
 
enum class enabler {};
 
template<bool B>
using EnableIf = typename std::enable_if<B, enabler>::type;
 
template <int N>
struct test {
	void foo() {}
 
	template<int P = N, EnableIf<P == 2>...>
	void bar() {
		std::cout << "N == 2\n";
	}
 
    template <int P = N, EnableIf<P == 3>...>
    void bar() {
    	std::cout << "N == 3\n";
    }
};
 
int main() {
  test<1> a = {};
  test<2> b = {};
  test<3> c = {};
 
  // a.foo();
  b.bar();
  // c.foo();
 
  // b.bar();
  c.bar();
 
  return 0;
}

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