[Cs3] on interfaces

[Mikhail Nesterenko]

CS3 students,

This is regarding the term interface. C++ does not formally have
this term. 

* there is an object oriented concept of a class interface (its public
  functions). This is what Design Patterns textbook mentions (on page
  13).

* there is a Java concept of interface class. In Java, it is used for
  two reasons. First, this is Java equivalent of an abstract class
  (class with pure virtual functions). Also, it is used to simulate
  multiple inheritance. C++ supports multiple inheritance directly.
  Hence, C++ does not need this concept. 

I cleaned up the "objectOriented" (that introduces template method
design pattern) set of slides to remove the term interface.

Thanks,
-- 
Mikhail