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operation
subject			fact

operation	carries out a responsibility of a class
	has definition The abstract notion of something that can be done by one or more classes
	is a subtopic of 9.2 - Principles Leading to Good Design
	is implemented as a set of methods
	is used to discuss and specify a type of behaviour, independently of any code which implements that behaviour
	is a kind of procedural abstraction
procedural abstraction	has advantage when using a certain procedure, a programmer does not need to worry about all the details of how it performs its computations; he or she only needs to know how to call it and what it computes
	hides the details of procedures

Kinds of operation :

• abstract operation (3 facts) - An operation in a class that makes logical sense for all subclasses, but that is not implemented in the class
• polymorphic operation (4 facts)
• pure virtual function (3 facts)