Cover fe ature 47 january 2012 Published by the ieee computer Society 0018-9162/12/$31. 00 2012 ieee

Rectangle(int x, int y, int h, int w); 

What does 

Rectangle (100,200,50,100)

 mean? Are 

h

 and 

w

 

the coordinates for the bottom right corner or a height and 

a width? To avoid errors, we should be more specific about 

Rectangle

’s requirements on its arguments:

Rectangle(Point xy, Area hv);

I can now write the clearer and less error-prone

Rectangle(Point(100,200), Area(50,100)); 

I can also add a second version:

Rectangle(Point top_left, Point bottom_right);

and use either of the following to suit my needs and 

preferences: 

Rectangle(Point(100,200), Area(50,100)); 

Rectangle(Point(100,200), Point(150,300)); 

To be relevant for infrastructure development, simple 

user-defined types (such as