// Factorial template function from Wikipedia.

#include <iostream>
#include <string>

// The general case:
template <int N> struct Factorial {
  static const int value = N * Factorial<N - 1>::value;
};
 
// The base case of the recursion, via template specialization:
template <>
struct Factorial<0> {
  static const int value = 1;
};

int main(){
  Factorial<5> facBox;
  std::cout << facBox.value << std::endl;           // 120
  std::cout << Factorial<10>::value << std::endl;   // 3628800
}