The Simple Singleton Pattern
The Simple Singleton pattern provides a global reference to an object that requires uniqueness. Figure 6-7 shows the class diagram.
Figure 6-7. Simple Singleton pattern class diagram
This pattern has the following parts:
- Concrete singleton
- Class member
- Client
The pattern's benefits are as follows:
- Grants global access to an object
- Maintains access to its unique instance
- Is easy to create
It also has this drawback:
- Can't be extended (change is a constant)
A Comprehensive Look
Chapter 4 explained that not all object-oriented languages are built equally, and therefore not all patterns can be implemented equally. ...
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