WeakPair primitive ?

[Allen Wirfs-Brock]

On Sep 15, 2011, at 10:21 AM, Sean Eagan wrote:

> Would a WeakPair primitive be useful...
> 
> let wp = new WeakPair(key, value);
> ...
> if(wp.hasKey(key)) {
>  foo(wp.value());
> }
> 
> WeakMap could be built on top of this primitive:

It's not that easy.  Read http://www.arnetminer.org/dev.do?m=downloadpdf&url=http://arnetminer.org/pdf/PDFFiles/--g---g-Index1247931776950/Ephemerons A New Finalization Mechanism1247944577286.pdf

You need Ephemeron pairs to build such abstractions

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