Inheritance
The bless function gives more information to a reference. It makes the reference be of a type: Student in this case. This has several uses in Perl, as we shall see. Using public methods to access private data is not the only benefit of the object-oriented approach. Another important principle, inheritance, is the cornerstone of object orientation.
Inheritance is one of the principal ways of implementing code reuse. The following are examples of inheritance relationships.
A Directory is a type of File.
A Manager is a type of Employee.
A Car is a type of MovingVehicle.
A Circle is a type of Shape.
Sometimes inheritance is characterized as the is-a relationship. In the File–Directory relationship, we say that a Directory is-a File. Likewise, ...
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