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Referential integrity

In C++


    class Foo {
        Bar* bar;
    };
    Foo* foo = new Foo();
    ...

Possible values of foo->bar:

OK: The address of a Bar.
OK: NULL.
Don't do this: Random memory, (e.g. Bar on stack from function we've exited, deallocated Bar, ...). Reading or writing foo->bar is a bad idea.

Pointing into random memory violates referential integrity.

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