std::negate is an STL functor for negation of values: it changes x to -x (and -x to x).


#include <algorithm>

#include <cassert>

#include <functional>

#include <vector>



int main()

{

  //Create an initial std::vector

  std::vector<int> v;

  v.push_back(0);

  v.push_back(1);

  v.push_back(2);

  v.push_back(3);



  //Create another std::vector

  std::vector<int> w;



  //Append the negated values from v to w

  std::transform(v.begin(),v.end(),std::back_inserter(w),std::negate<int>());



  //Check if std::negate worked properly

  assert(v.size() == w.size());

  assert(v[0] == - w[0]);

  assert(v[1] == - w[1]);

  assert(v[2] == - w[2]);

  assert(v[3] == - w[3]);

}

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(C++) std::negate