Similar to the Windows SIZE structure, which implements a relative coordinate or position.
This class is derived from the SIZE structure. This means you can pass a CSize in a parameter that calls for a SIZE and that the data members of the SIZE structure are accessible data members of CSize.
The cx and cy members of SIZE (and CSize) are public. In addition, CSize implements member functions to manipulate the SIZE structure.
For more information on shared utility classes (like CSize), see Shared Classes.