Single-piece mode, as written in the post of Epower, is used to create a pattern that requires a globally unique instance. Just a little bit to correct. In singleton mode, the constructor should be protected. So subclasses can extend this constructor.
Single-piece mode is mainly used in the following situations:
For a class, there is a lot of system resources to occupy. And these resources can be shared globally, they can be designed as singleton patterns, forcing only one instance of the global
For a class, you need to count the instances. Can be done in CreateInstance.
And you can limit the number of instances.
For a class, you need to control the specific behavior of its instance, for example, the instance you expect to return is actually an instance of your own subclass. This allows the client code to be transparent through the singleton mode.
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