Recitation - Mar 21, 2011

Additional language feature/construct.
Facilitates the design of classes being modeled as real world concepts.
Can be used to make the code more closely resemble these real world concepts.
Inheritance can be used to more directly support the application design.
Expresses a relationship between classes.
Derived class can be thought of as inheriting the properties from its base class.
Base class is sometimes referred to as a superclass.
Derived class is sometimes referred to as a subclass.
Graphical representation

class BASE { /* ... */ }
class DERIVED : public BASE { /* ... */ }

class Shape { /* ... */ }
class Rectangle : public Shape { /* ... */ }

Declares functions in a base class that can be redefined in a derived class.
Pure virtual function is a function that must be defined by a non-abstract, dervied class.
Abstract class

class that has one or more pure virtual functions.
class that only makes sense as a base for a derived object, but does not make sense as a standalone object.
Syntax

class CLASS_NAME {
	...
	virtual void FUNCTION() = 0;
};