std::adjacent_difference is an STL algorithm to perform operations on two adjacent container elements (which, by default is std::minus).


#include <cassert>

#include <functional>

#include <numeric>

#include <vector>



int main()

{

  std::vector<int> v;

  v.push_back(1);

  v.push_back(4);

  v.push_back(9);



  std::vector<int> w;



  std::adjacent_difference(v.begin(),v.end(),

    std::back_inserter(w));



  assert(w[0] == 1); //v[0]

  assert(w[1] == 3); //v[1]-v[0]

  assert(w[2] == 5); //v[2]-v[1]



  std::vector<int> x;



  std::adjacent_difference(v.begin(),v.end(),

    std::back_inserter(x),std::multiplies<int>());



  assert(x[0] ==  1); //v[0]

  assert(x[1] ==  4); //v[1]*v[0]

  assert(x[2] == 36); //v[2]*v[1]

}

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(C++) std::adjacent_difference