Check if this is null - checking if this is null

problem ：

Does it ever make sense to check if this is null? Check this Whether it is empty or meaningful ？

Say I have a class with a method; Suppose I have a class with methods ;inside that method, I check this == NULL , and if it is, return an error code. In this method , I check this == NULL , If it is , The error code is returned .

If this is null, then that means the object is deleted. If this It's empty. , Then this means that the object is deleted .Is the method even able to return anything? Can this method even return anything ？

Update: I forgot to mention that the method can be called from multiple threads and it may cause the object to be deleted while another thread is inside the method. to update ： I forgot to mention that this method can be called from multiple threads , It may cause the object to be deleted , Another thread is inside the method .

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Solution ：

Reference resources ： https://stackoom.com/en/question/7ji1