GC.forget() (Was: O(N) Garbage collection?)

[bearophile]

dsimcha:

> Yeh, I rebuilt the same model in my head over the past few hours (like 
> you, I had a good mental model of the GC at one point but have slowly 
> forgotten it).

For serious D programmers having such model in the head is so important that I'd like a short page with such explanations & pseudocode in the D site :-)

Bye,
bearophile