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C++ In Theory: The Singleton Pattern, Part 2


In our second article on the Singleton pattern, J. Nakamura discusses a reusable code version of the pattern.

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By: J. Nakamura
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January 25, 2005
TABLE OF CONTENTS:
  1. · C++ In Theory: The Singleton Pattern, Part 2
  2. · Singleton Generalization
  3. · Testing Our Generic Implementation
  4. · Singletons are not for Simpletons

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C++ In Theory: The Singleton Pattern, Part 2
(Page 1 of 4 )

In the previous article I introduced a design pattern named the “Singleton” as it is described in the book Design Patterns [Gamma]. Design patterns are very useful for describing solutions to common problems that software engineers often encounter. The Singleton pattern is a solution to the desire to have only one object of a class instantiated during the lifetime of your application.

Though design patterns were invented because solutions were often not reusable on the code level, the singleton pattern actually does have a reusable code version. We are going to look at a way to generalize the singleton implementation and how we can use the generalization to deal with construction/destruction sequence problems.

This topic will be covered in four sections:

  1. Singleton Generalization;

  2. Testing Our Generic Implementation;

  3. Singletons are not for Simpletons; and

  4. Resources.

Let's get started.


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