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Entries from Friday, December 23. 2005

Friday, December 23. 2005

Fun with C++ templates: let the compiler compute the factorial!

This is probably already well-known to some of you, but nevertheless, I played a little bit with C++ templates, and wrote a piece of C++ template code that lets the compiler computer a number's factorial for you.
  1. template <int N>
  2. struct fact {
  3.     enum { value = N * fact<N-1>::value };
  4. };
  5.  
  6. template <>
  7. struct fact<1> {
  8.     enum { value = 1 };
  9. };
Not very useful, but nevertheless fun. You use it the following way:
  1. std::cout << "5! = " << fact<5>::value << std::endl;
Posted by Andreas Krennmair at 14:00 | Comment (1) | Trackbacks (0)
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Andreas Krennmair, software engineer, open-source developer, currently living and working in Berlin, Germany.

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