Compile-time factorial in C++

factorial.cpp

#include <iostream>
using namespace std;

template <int N> struct Factorial {
    enum { value = N * Factorial<N - 1>::value };
};

template <> struct Factorial<0> {
    enum { value = 1 };
};

int main() {
    cout << Factorial<10>::value;
    return 0;
}