Use a binary function object to find the midpoints between elements in v3 and v4 and store the results in v5. : transform « STL Algorithms Modifying sequence operations « C++






  1. C++
  2. STL Algorithms Modifying sequence operations
  3. transform

Use a binary function object to find the midpoints between elements in v3 and v4 and store the results in v5.

  
#include <iostream>
#include <vector>
#include <algorithm>
#include <functional>
using namespace std;

// finds the midpoint between two values.
class midpoint : binary_function<int, int, double> {
public:
  result_type operator()(first_argument_type a, second_argument_type b) {
    return((a-b) / 2) + b;
  }
};

int main(){
  int i;

  vector<int> v3, v4, v5(10);
  for(i = 0; i < 10; ++i) 
     v3.push_back(i);
  for(i = 10; i < 20; ++i) 
     if(i%2) 
        v4.push_back(i); 
     else 
        v4.push_back(-i);

  transform(v3.begin(), v3.end(), v4.begin(), v5.begin(), midpoint());

  return 0;
}








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