C++TMP to Test Prime Number

Cxx_TMP_TestPrimeNumber.cxx

template<int N, int D>
struct IsPrimeND{
	enum{
		ret = (N%D != 0) && IsPrimeND<N, D - 1>::ret
	};
};
// template specialization
template<int N>
struct IsPrimeND<N, 1>{
	enum{
		ret = true
	};
};
template<int N>
struct IsPrimeND<N, 0>{
	enum{
		ret = true
	};
};

template<int N>
struct IsPrime{
	enum{
		ret = IsPrimeND<N, N - 1>::ret
	};
};


int main()
{
	static_assert(IsPrime<1>::ret == true, "");
	static_assert(IsPrime<2>::ret == true, "");
	static_assert(IsPrime<6>::ret == false, "");
	static_assert(IsPrime<30>::ret == false, "");
	static_assert(IsPrime<37>::ret == true, "");
	return 0;
}

clang -std=c++11 cxxtmp_prime_test.cxx