Niko Matsakis wrote:
- Why do you say Java doesn't have a weakmap? What is the
[WeakHashMap][2] class if not a WeakMap? Presumably we are using the
term differently? (I imagine there are many variations of weakmaps
which vary in subtle but significant ways)
Quoting from [2]:
"*Implementation note:* The value objects in a WeakHashMap are held by
ordinary strong references. Thus care should be taken to ensure that
value objects do not strongly refer to their own keys, either directly
or indirectly, since that will prevent the keys from being discarded."
In contrast, an ES6 WeakMap is an ephemeron table, where the keys and
values can be twisted into cycles, but so long as no live key object
remains, the whole knot can be cut and collected. See
http://en.wikipedia.org/wiki/Ephemeron (but Allen's testimony trumps
this page, given his being in the room when Ephemerons were discovered).
/be
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