What are the characteristics of static member functions?

Characteristics of static member functions:

1. They are shared by all objects of the class and do not belong to a certain object. It can be called directly through the class name::.

2. Compared with ordinary member functions, there is no hidden this pointer as a parameter. This can be used to encapsulate thread classes.

3. Static member functions can only access static member variables.

4. Static local variables are saved in the global data area instead of on the stack. Each value is kept until the next call until a new value is assigned next time.

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