transform_inclusive_scan() function in C++

In this tutorial, we will be discussing a program to understand the transform_inclusive_scan() function in C++.

Example

 Live Demo

#include <iostream>
#include <vector>
using namespace std;
namespace point_input_iterator {
   template <class InputItrator, class OutputItrator, class BinaryOperation, class UnaryOperation>
   OutputItrator transform_inclusive_scan(InputItrator first, 
      InputItrator last,
      OutputItrator d_first,
      BinaryOperation binary_op,
      UnaryOperation unary_op){
     
      *d_first = unary_op(*first);
      first++;
      d_first++;
      for (auto it = first; it != last; it++) {
         //calculating the prefix sum
         *d_first = binary_op(unary_op(*it), *(d_first - 1));
         d_first++;
      }
      return d_first;
   }
}
int main(){
   //inputting elements using vector
   vector<int> InputVector{ 11, 22, 33, 44, 55, 66, 77, 88 };
   vector<int> OutputVector(8);
   point_input_iterator::transform_inclusive_scan(InputVector.begin(), InputVector.end(), OutputVector.begin(), [](auto xx, auto yy) {
      return xx + yy;
   },
   [](auto xx) {
      return xx * xx;
   });
   for (auto item : OutputVector) {
      //printing the output item
      cout << item << " ";
   }
   cout << std::endl;
   return 0;
}

Output

121 605 1694 3630 6655 11011 16940 24684