Eliminate allocations in no-op write operations (Set.With, Map.With) - #94
Merged
Merged
Conversation
Add `same` field to CombineArgs for identity detection in leaf nodes. When a write doesn't change the collection, leaves return themselves unchanged, short-circuiting all spine allocation. Tree.WithWith uses cached CombineArgs to avoid per-call boxing of equality/hash functions. Bonus: mutating inserts also improved (Map.Insert 1k: 12→3 allocs). Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
1 participant
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
Add
samefield to CombineArgs for identity detection in leaf nodes.When a write doesn't change the collection, leaves return themselves
unchanged, short-circuiting all spine allocation. Tree.WithWith uses
cached CombineArgs to avoid per-call boxing of equality/hash functions.
Bonus: mutating inserts also improved (Map.Insert 1k: 12→3 allocs).
Co-Authored-By: Claude Opus 4.6 noreply@anthropic.com