C++:Singleton Class


A class whose number of instances that can be instantiated is limited to one is called a singleton class. Thus, at any given time only one instance can exist, no more.

Can you give me an example, where it is used?

The singleton design pattern is used whenever the design requires only one instance of a class. Some examples:
  • Application classes. There should only be one application class. (Note: Please bear in mind, MFC class 'CWinApp' is not implemented as a singleton class)
  • Logger classes. For logging purposes of an application there is usually one logger instance required.

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