On Tue, Apr 14, 2015 at 10:50 AM, Michael J Gruber
<g...@drmicha.warpmail.net> wrote:

> "to dangle" means "to hang loosely".
>
> So, in the description above, "A^ dangles from A loosely" because it
> hangs from A (you can reach it from A) but loosely, because it would
> "drop" if A gets dropped and A is "likely" to be dropped (because it is
> unreachable by refs). But A^ is not dangling in our terminology.
>
> If you *reverse the arrows*, i.e. consider A^ pointing to A, it becomes
> more apparent that A is dangling: it is an unreferenced leaf node.

That's exactly what confused me. In the very literal sense, something
can only "hang loosely", i.e. dangle, if it's only tied at *one* end,
and that's the case for A (which is only connected to A^) but not for
A^ (which is connected to its parent, and A). Especially when talking
about A as a "leaf" node, like in the leaf of a natural tree, I would
think that A is dangling.

-- 
Sebastian Schuberth
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