factorial.cpp

来自「很经典的书籍」· C++ 代码 · 共 16 行

//: C05:Factorial.cpp
// Compile-time computation!
#include <iostream>
using namespace std;
template<int n>
struct Factorial {
   enum {val = Factorial<n-1>::val * n};
};
template<>
struct Factorial<0> {
   enum {val = 1};
};
int main() {
   cout << Factorial<12>::val << endl; // 479001600
} ///:~