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From: Chuck Messenger (chuckm_at_[hidden])
Date: 2003-05-30 13:38:17

Gregory Colvin wrote:
> Thanks, but your description of cyclic_ptr is pretty far off the mark.

Sorry -- hopefully you'll forgive my ignorance. I'm just throwing out
what I understand to be the case, in the hopes that someone (such as
yourself) would set me straight...

> It does not maintain a global map, and copying cyclic_ptr cost the same
> as copying shared_ptr.

OK, I'll have to review the old messages again. I thought someone had
said cyclic_ptr used a global map. Sorry. I suppose better yet would
be for me to study your actual *code*...

Do you do a raw scan of memory, like sp_collector, then? (i.e. not
perfect discovery)

> The special assignment mode is used only during
> the mark phase of a collection, and costs more or less the same as any
> other discovery method.

Suppose I have the structure:

     struct Image {
         char huge_image[ONE_ZILLION];
         cyclic_ptr<whatever> ptr;

As I understand it, in order to discover 'ptr', you'd invoke operator=()
on each Image structure you came to. Correct, or incorrect?

     - Chuck Messenger

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