#include <iostream>
#include <type_traits>

template <typename T, T N, typename = void > 
struct X {
  static const bool isZero = false;
};

template <typename T, T N>
struct X < T, N, typename std::enable_if<N == 0>::type > {
  static const bool isZero = true;
};

int main(int argc, char* argv[]) {
    std::cout << X <int, 0>::isZero << std::endl;
    std::cout << X <int, 1>::isZero << std::endl;
    return 0;
}