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  1. #include <iostream>
  2. #include <vector>
  3.  
  4. template <class T>
  5. struct average
  6. {
  7.   typedef T InternalType; // default
  8.  
  9.   InternalType operator()(const std::vector<T>& v)
  10.   {
  11.     InternalType vectorSum = 0;
  12.     for(unsigned int i = 0; i < v.size(); ++i)
  13.     {
  14.       vectorSum += v[i];
  15.     }
  16.     return vectorSum / static_cast<float>(v.size());
  17.   }
  18. };
  19.  
  20. template <>
  21. struct average<unsigned char>
  22. {
  23.   typedef float InternalType;
  24. };
  25.  
  26. int main(int argc, char *argv[])
  27. {
  28.   std::vector<float> floatVector;
  29.   std::vector<unsigned char> ucVector;
  30.  
  31.   for(unsigned int i = 0; i < 5; ++i)
  32.   {
  33.     floatVector.push_back(i);
  34.     ucVector.push_back(i);
  35.   }
  36.  
  37.   average<float> floatAverageFunctor;
  38.   average<unsigned char> ucAverageFunctor;
  39.   std::cout << "Float average: " << floatAverageFunctor(floatVector) << std::endl;
  40.   std::cout << "UC average: " << ucAverageFunctor(ucVector) << std::endl;
  41.  
  42.   return 0;
  43. }
  44.  
Compilation error #stdin compilation error #stdout 0s 0KB
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stdin
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Standard input is empty
compilation info 
prog.cpp: In function ‘int main(int, char**)’:
prog.cpp:40: error: no match for call to ‘(average<unsigned char>) (std::vector<unsigned char, std::allocator<unsigned char> >&)’
stdout
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Standard output is empty
https://ideone.com/fZ26B
language:
C++ (gcc 8.3)
created:
14 years ago
visibility:
public

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