Factorial via template metaprogramming

Here is an example implementation of factorial via template metaprogramming:

	#include <iostream>
	template <int N>
	struct fact
	{
	static const int value = N * fact<N - 1>::value;
	};
	template <>
	struct fact<0>
	{
	static const int value = 1;
	};
	int main()
	{
	std::cout << fact<6>::value << std::endl;
	std::cout << fact<3>::value << std::endl;
	return 0;
	}

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