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if the arc is the last: the data structure is destructed and deallocated + atomic check

if the arch is not the last: atomic check

You might lose 100 ns or 300 ms. When? Nobody knows. You lose nothing when going out of scope with GC.

as a programmer you know and you can even control it by designing the appropriate scope and moving between scopes

> You lose nothing when going out of scope with GC.

actually, you don't know

Yes, I can, e.g. by implementing deferred deallocation, which is a primitive GC form.

> actually, you don't know

I know because I’ve verified it.

> Yes, I can, e.g. by implementing deferred deallocation, which is a primitive GC form.

sounds more like a form of manual memory management

Manual management involves an explicit function call. Functions called by a destructor are considered automatic.

How does this relate?

What exactly don't you understand?

how this relates to garbage collectors