CSC/ECE 517 Fall 2011/ch17 5b uo

When to use Inheritance

Introduction

Inheritance is a useful programming concept, but it is easy to abuse this concept. Often interfaces or delegation are better options. In this wiki chapter, we will discuss the situations when to use and when not to use inheritance.

Inheritance is a good choice when:

Your inheritance hierarchy represents an "is-a" relationship and not a "has-a" relationship.

You can reuse code from the base classes.

You want to implement polymorphism.

The class hierarchy is reasonably shallow, and other developers are not likely to add many more levels.

You want to make global changes to derived classes by changing a base class.

These points are discussed in detail below

Code Reuse

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Drawbacks of inheritance

Inheritance is not without its own set of drawbacks. If inheritance is applied without due consideration problems can arise. In some situations it can:

• Reduce the comprehensibility of code.
  
• Make maintenance harder.
  
• Make further development harder.
  
• Reduce reliability of code.
  
• Reduce overall reuse.
  

References

• http://web.cs.mun.ca/~donald/bsc/node13.html