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Week 6, session 1: object-oriented design

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5CCYB041

OBJECT-ORIENTED PROGRAMMING

Week 6, session 1

object-oriented design

Abstraction and encapsulation

The difference between abstraction and encapsulation is far from obvious!

According to Bjarne Stroustrup, the original developer of C++:

  • abstraction is the act of specifying a general interface hiding implementation details.
  • encapsulation is the enforcement of abstraction by mechanisms that prevent access to implementation details of an object or a group of objects except through a well-defined interface.

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Abstraction relates to the process by which we decide which methods to make available to users, and which aspects of the implementation (data members, etc) should be hidden from users

  • this is more about the design process

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encapsulation relates the means by which abstraction is enforced.

  • C++ classes provides a mechanism to achieve encapsulation
  • this is more about the implementation process

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In practice, the two concepts go hand in hand: abstraction relies on encapsulation, and vice-versa