This is mainly intended for implementors of weak data-structures, to allow the cleaning of stale references in Collect::trace, where fully upgrading a GcWeak isn't possible.
An alternative API would be to expose upgrade methods on CollectionContext instead, but this eems much more constraining on the possible space of GC algorithms.
This is mainly intended for implementors of weak data-structures, to allow the cleaning of stale references in
Collect::trace, where fully upgrading aGcWeakisn't possible.An alternative API would be to expose upgrade methods on
CollectionContextinstead, but this eems much more constraining on the possible space of GC algorithms.