#include <iostream>
#include <string>
#include "point.h"

int main(){
  Point p(1,2);                 // p is a Point 
  p.move(0,1);

  const Point q(3,4);           // q is a constant point.
  q.move(1,2);                  // error (compile time)

  const Point *r = &p;          // r is pointer to constant point
  r->move(1,2);                 // error (compile time)

  Point *const s = &p;          // s is a constant pointer to 'the point p'. *const is a 'declarator operator'.
  s->move(1,2);                 // ok
  s = NULL;                     // error: Assignment of read-only variable s. (Compile time)

  Point const* w = &p;          // w is a pointer to a constant point.  const* is NOT a 'declarator operator'.
                                // Point const ...  and  const Point means the same.
  const Point *w = &p;          // Equivalent to the line above. But here w is illegally defined twice, of course.
  w->move(1,2);                 // error (compile time). Cannot mutate a constant point.

  const Point *const t= &p;     // t is a constant pointer to a constant point.
  t->move(1,2);                 // error (compile time)
  t = NULL;                     // error (compile time)

  Point const *const v= &p;     // Same as definition of t. 
}