std.hash_map: adding a rehash() method #19923
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@linusg thanks! fixed those 3 comments, and rebased on master again. |
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Note: this resurrects the recently closed #17890.
This allows a highly fragmented HashMap to have tombstones removed as the values are all rehashed.
It would be nice to make this
rehash()automatically, but that currently presents a challenge where it doesn't work with adapted contexts since the keys are not preserved in the map for re-hashing and the hash value is not stored currently, and the non-adapted contexts require a bit of additional book-keeping to check before calling rehash().This is a partial fix for #17851, but requires the user to call
rehash()periodically to get the benefit.