c++ - Lifetime of object is over before destructor is called?

Question

I don't understand this:

3.8/1 "The lifetime of an object of type T ends when: — if T is a class type with a non-trivial destructor (12.4), the destructor call starts, or — the storage which the object occupies is reused or released."

If the lifetime ends before the destructor starts, doesn't that mean accessing members in the destructor is undefined behavior?

I saw this quote too:

12.7 "For an object with a non-trivial destructor, referring to any non-static member or base class of the object after the destructor finishes execution results in undefined behavior."

But it doesn't make clear what's allowed during the destructor.

Answer 1

If the lifetime ends before the destructor starts, doesn't that mean accessing members in the destructor is undefined behavior?

Hopefully not:

From N3242 Construction and destruction [class.cdtor] /3

To form a pointer to (or access the value of) a direct non-static member of an object obj, the construction of obj shall have started and its destruction shall not have completed, otherwise the computation of the pointer value (or accessing the member value) results in undefined behavior.