I understand that objects are passed by reference in Java (similarly to ECMAScript), however I'm not sure how implementations link Lexical Environments' identifiers to their respective values, and re-mapping these would be more complicated than the C++ sample you've posted I believe.
As far as I can see, this seems a lot more complicated than it is worth, and it would at least require a new abstract operation for internally in-place replacing objects while keeping references intact. Wouldn't it be far easier to just have an internal data property in each Weak(Map|Set) which can be replaced by a new list/object? Then implementations can just access/pass-by-reference the Weak(Set|Map) object and methods can read its data property. In fact, that seems to be what the spec already does: > ### [23.3.3.1 WeakMap.prototype.clear ( )]( https://people.mozilla.org/~jorendorff/es6-draft.html#sec-weakmap.prototype.clear ) > ... > 5. Set the value of M’s [[WeakMapData]] internal slot to a new empty List. And > ### [23.4.3.2 WeakSet.prototype.clear ( )]( https://people.mozilla.org/~jorendorff/es6-draft.html#sec-weakset.prototype.clear ) > ... > 5. Set the value of S’s [[WeakSetData]] internal slot to a new empty List. How would your proposal simplify those algorithms?
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