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  1. #include <iostream>
  2.  
  3. template <int N>
  4. struct Factorial
  5. {
  6.     enum
  7. 	{
  8. 		value = N * Factorial<N - 1>::value
  9. 	};
  10. };
  11.  
  12. template <>
  13. struct Factorial<0>
  14. {
  15.     enum
  16. 	{
  17. 		value = 1
  18. 	};
  19. };
  20.  
  21. unsigned int factorial(unsigned int n)
  22. {
  23.     return (n == 0)? 1 : n * factorial(n - 1); 
  24. }
  25.  
  26. using namespace std;
  27.  
  28. int main()
  29. {
  30.   const int x = factorial(0);
  31.   const int y = factorial(10);
  32.   const int z = Factorial<0>::value;
  33.   const int v = Factorial<10>::value;
  34.  
  35.   cout << x << endl
  36.        << y << endl
  37.        << z << endl
  38.        << v << endl;
  39.  
  40.   return 0;
  41. }
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https://ideone.com/JutXP9
Advanced CPP: Template techniques
Template metaprogramming
language:
C++ (gcc 8.3)
created:
9 years ago
visibility:
secret

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