The difference between a class's member function and an ordinary member function

Difference 1:

A static member function is actually a global function that does not depend on the object of a class. The static member function does not have the this pointer, but belongs to the class and does not create an object to call.

The ordinary member function relies on the object of a class, that is, it has a hidden call parameter (this) pointer, which must point to the object of a class.

Difference 2:

Static functions can only access static member variables in the class;

Difference 3::

If a member function wants to be used as a callback function, such as creating a thread, it is generally only possible to define it as a static member function.

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The difference between a class's member function and an ordinary member function