State design pattern - delete this in C++ [duplicate]

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• C++: Delete this? 9 answers

I am using the example below to implement a state design pattern.

http://ift.tt/1B2XdvI

I am concerned about delete a this pointer inside a member class:

void on(Machine *m)
{
    m->setCurrent(new ON());
    delete this;
}

Is it safe to do that? What could happens if I call other member function after delete?

Is there a better approach?

Best regards,