// Illustrates a struct Point - a literal type -  with constexpr member functions.

#include <iostream>
#include <string>

struct Point {     // A literal type 
  double x, y;
  constexpr double getx () {return x;}
  constexpr double gety () {return y;}
  constexpr Point move(double dx, double dy){return Point{x + dx, y + dy};}
};


// Points handled at compile-time - the last is an array of points:
constexpr Point origo {0,0};
constexpr Point  p1 = origo.move(3.1, 4.2);
constexpr Point pa[] = {origo, p1, p1.move(0.9, -0.2)};

int main(){
  using namespace std;

  cout << "(" << origo.getx() << "," << origo.gety() << ")" << endl;  // (0,0)
  cout << "(" <<    p1.getx() << "," <<    p1.gety() << ")" << endl;  // (3.1, 4.2)

  for(auto p: pa)
    cout << "(" <<    p.getx() << "," <<    p.gety() << ")" << endl;  // (0,0) (3.1, 4.2) (4,4)
}