C++ programming for Meta

metaprogramming.cpp

#include <iostream>

template <int n>
struct factorial
{
    enum
    {
        output = 2 * factorial<n - 1>::output
    };
};

template <>
struct factorial<0>
{

    enum
    {
        output = 1
    };
};

int main()
{
    std::cout << factorial<5>::output << std::endl;
    return 0;
}