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Fix memory leak in flow tree by adding weak refs. #5228

Merged
merged 1 commit into from Mar 16, 2015
Merged

Fix memory leak in flow tree by adding weak refs. #5228

merged 1 commit into from Mar 16, 2015
+147 −18

Commits on Mar 16, 2015

  1. Fix memory leak in flow tree by adding weak refs. 

    Cycles were being created in the flow tree since absolutely positioned
descendants had pointers to their containing blocks. This adds
WeakFlowRef (based on Weak<T>) and makes these backpointers weak
references. This also harmonizes our custom Arc<T>, FlowRef, to be
consistent with the upstream implementation.

Fixes #4915.
    @metajack
    metajack committed Mar 16, 2015
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