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template madness: factorial
#include <iostream>
using std::cout;
using std::endl;
template <int N>
struct factorial {
constexpr static int value = N * factorial<N-1>::value;
};
template <>
struct factorial<0> {
constexpr static int value = 1;
};
int
main() {
std::cout << "5! = " << (factorial<5>::value) << std::endl;
return 0;
}
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