Calling copy constructors

• Called when an object is passed to a function...
  ...but not if passed by reference!!

• Called when an object is returned from a function.

• Called when one object is used to initialize another:

  
      Point pt1( 5, 10 );
      Point pt2 = pt1;    // Initializer syntax is preferred!
      Point pt3( pt1 );   // Hm... Sometimes, when C++ templates are used,
                          // this could confuse compiler to think that
                          // the last line is a declaration of a function
                          // named pt3, which returns a Point object.