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  1. #include <iostream>
  2. #include <algorithm>
  3. #include <functional>
  4. #include <vector>
  5. #include <numeric>
  6. using namespace std::placeholders;
  7.  
  8. template<class T>
  9. struct multiply_range : public std::binary_function<T, T, T> {
  10. public:
  11.     multiply_range() : i(0), j(1) { }
  12.     T operator()(T a, T b) {
  13.        /*if (!(this->i++ % 2)) {
  14.            if (this->j++ % 2)
  15.               return a * b;
  16.        } else {
  17.             this->j++;
  18.         	return 0;
  19.         }*/
  20.        return (!(this->i++ % 2)) ? ((this->j++ % 2) ? a * b : 0) : (this->j++, 0);
  21.     }
  22. private:
  23.     std::size_t i, j;
  24. };
  25.  
  26.  
  27. int main() {
  28. 	std::function<int(int, int)> Multiply = std::bind<int>(multiply_range<int>(), _1, _2);
  29.     std::vector<int> vec_numsx = {1,2,3,4,5};
  30.     std::vector<int> vec_numsy = {5,6,7,8,9,10};
  31.     std::cout << std::inner_product(vec_numsx.begin(), 
  32.                                     vec_numsx.end(), 
  33.                                     std::next(vec_numsy.begin()), 
  34.                                     0, 
  35.                                     std::plus<int>(),
  36.                                     Multiply);
  37.     return 0;
  38. }
Success #stdin #stdout 0s 16064KB
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https://ideone.com/E6FxAM
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
public

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