// Same as above, with a using directive for the std namespace. Actually it illustrates a bad use of a using directive.

#include <iostream>    
#include <vector>
#include <cmath>    // abs
#include "point.h"

using namespace std;   // In this variant, we do not qualify each name from the standard namespace with std::

// Illustration of alternative return type - best if return type depends on parameters.
auto find_diagonal_points(vector<Point> points) -> vector<Point>{
  vector<Point> res;
  for(auto p: points)
    if(abs(p.getx())==abs(p.gety()))
      res.push_back(p);
  return res;
}

void without_auto(){
  int i{5};

  vector<Point> points = {Point{1,1}, Point{1,2}, Point{-1,1}, Point{-2,2}};
  vector<Point> diagonal_points = find_diagonal_points(points);
  for(Point p: diagonal_points)
    cout << p << endl;
}

void with_auto(){
  auto i = 5;       // initialize auto's with =, not {}.

  auto points = vector<Point>{{Point{1,1}, Point{1,2}, Point{-1,1}, Point{-2,2}}};
  auto diagonal_points = find_diagonal_points(points);
  for(auto p: diagonal_points)
    cout << p << endl;
}

int main () {
  without_auto();
  cout << endl;
  with_auto();
}