std::adjacent_difference is an STL algorithm to obtain the difference between two elements in a container.


#include <algorithm>

#include <cassert>

#include <iterator>

#include <numeric>

#include <vector>



int main()

{

  std::vector<int> v;

  v.push_back(1);

  v.push_back(4);

  v.push_back(9);

  v.push_back(16);

  v.push_back(25);



  std::vector<int> w;

  std::adjacent_difference(v.begin(), v.end(), std::back_inserter(w));

  assert(w[0] == 1 - 0);

  assert(w[1] == 4 - 1);

  assert(w[2] == 9 - 4);

  assert(w[3] == 16 - 9);

  assert(w[4] == 25 - 16);

}

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(C++) std::adjacent_difference