Chris Jefferson has been reading The Daily WTF for a little while now and often wondered how many of the posts here were made up. Then he came across a "don't touch" system; you know, the type so sensitive to changes that even adding too many spaces between compiler switches will cause a complete melt down. The C++ folks with templates experience will definitely appreciate this most ...

// We use this as adding is faster than multiplication
// When multiplying small values together
template<int firstval, int secondval>
  struct QuickMultiply
  { 
    static const int value = 
      QuickMultiply<firstval, secondval - 1>::value + firstval; 
  };

template<int firstval>
  struct QuickMultiply<firstval,1>
  { 
    static const int value = firstval; 
  };

This functionish thing is called through the code like this: "QuickMultiply<4,5>::value". Since templates can't accomidate non-constant values, you can only pass in constants. At compile time, the compiler would convert our expression like this ...

  result = QuickMultiply<4,5>::value
         = QuickMultiply<4,4>::value + 4
         = QuickMultiply<4,3>::value + 4 + 4
         = QuickMultiply<4,2>::value + 4 + 4 + 4
         = QuickMultiply<4,1>::value + 4 + 4 + 4 + 4
         = 4 + 4 + 4 + 4 + 4
         = 20

... for the most part, that is; the fours would actually be wrapped in a struct. It sort of the less efficient way of doing "4*5", which the compiler will also replace with "20" at compile time.