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authormo khan <mo@mokhan.ca>2025-07-02 18:36:06 -0600
committermo khan <mo@mokhan.ca>2025-07-02 18:36:06 -0600
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+# Releases
+
+## 2.9.0 (2025-04-04)
+
+- Added a `get_disjoint_mut` method to `IndexMap`, matching Rust 1.86's
+ `HashMap` method.
+- Added a `get_disjoint_indices_mut` method to `IndexMap` and `map::Slice`,
+ matching Rust 1.86's `get_disjoint_mut` method on slices.
+- Deprecated the `borsh` feature in favor of their own `indexmap` feature,
+ solving a cyclic dependency that occured via `borsh-derive`.
+
+## 2.8.0 (2025-03-10)
+
+- Added `indexmap_with_default!` and `indexset_with_default!` to be used with
+ alternative hashers, especially when using the crate without `std`.
+- Implemented `PartialEq` between each `Slice` and `[]`/arrays.
+- Removed the internal `rustc-rayon` feature and dependency.
+
+## 2.7.1 (2025-01-19)
+
+- Added `#[track_caller]` to functions that may panic.
+- Improved memory reservation for `insert_entry`.
+
+## 2.7.0 (2024-11-30)
+
+- Added methods `Entry::insert_entry` and `VacantEntry::insert_entry`, returning
+ an `OccupiedEntry` after insertion.
+
+## 2.6.0 (2024-10-01)
+
+- Implemented `Clone` for `map::IntoIter` and `set::IntoIter`.
+- Updated the `hashbrown` dependency to version 0.15.
+
+## 2.5.0 (2024-08-30)
+
+- Added an `insert_before` method to `IndexMap` and `IndexSet`, as an
+ alternative to `shift_insert` with different behavior on existing entries.
+- Added `first_entry` and `last_entry` methods to `IndexMap`.
+- Added `From` implementations between `IndexedEntry` and `OccupiedEntry`.
+
+## 2.4.0 (2024-08-13)
+
+- Added methods `IndexMap::append` and `IndexSet::append`, moving all items from
+ one map or set into another, and leaving the original capacity for reuse.
+
+## 2.3.0 (2024-07-31)
+
+- Added trait `MutableEntryKey` for opt-in mutable access to map entry keys.
+- Added method `MutableKeys::iter_mut2` for opt-in mutable iteration of map
+ keys and values.
+
+## 2.2.6 (2024-03-22)
+
+- Added trait `MutableValues` for opt-in mutable access to set values.
+
+## 2.2.5 (2024-02-29)
+
+- Added optional `borsh` serialization support.
+
+## 2.2.4 (2024-02-28)
+
+- Added an `insert_sorted` method on `IndexMap`, `IndexSet`, and `VacantEntry`.
+- Avoid hashing for lookups in single-entry maps.
+- Limit preallocated memory in `serde` deserializers.
+
+## 2.2.3 (2024-02-11)
+
+- Added `move_index` and `swap_indices` methods to `IndexedEntry`,
+ `OccupiedEntry`, and `RawOccupiedEntryMut`, functioning like the existing
+ methods on `IndexMap`.
+- Added `shift_insert` methods on `VacantEntry` and `RawVacantEntryMut`, as
+ well as `shift_insert_hashed_nocheck` on the latter, to insert the new entry
+ at a particular index.
+- Added `shift_insert` methods on `IndexMap` and `IndexSet` to insert a new
+ entry at a particular index, or else move an existing entry there.
+
+## 2.2.2 (2024-01-31)
+
+- Added indexing methods to raw entries: `RawEntryBuilder::from_hash_full`,
+ `RawEntryBuilder::index_from_hash`, and `RawEntryMut::index`.
+
+## 2.2.1 (2024-01-28)
+
+- Corrected the signature of `RawOccupiedEntryMut::into_key(self) -> &'a mut K`,
+ This a breaking change from 2.2.0, but that version was published for less
+ than a day and has now been yanked.
+
+## 2.2.0 (2024-01-28)
+
+- The new `IndexMap::get_index_entry` method finds an entry by its index for
+ in-place manipulation.
+
+- The `Keys` iterator now implements `Index<usize>` for quick access to the
+ entry's key, compared to indexing the map to get the value.
+
+- The new `IndexMap::splice` and `IndexSet::splice` methods will drain the
+ given range as an iterator, and then replace that range with entries from
+ an input iterator.
+
+- The new trait `RawEntryApiV1` offers opt-in access to a raw entry API for
+ `IndexMap`, corresponding to the unstable API on `HashSet` as of Rust 1.75.
+
+- Many `IndexMap` and `IndexSet` methods have relaxed their type constraints,
+ e.g. removing `K: Hash` on methods that don't actually need to hash.
+
+- Removal methods `remove`, `remove_entry`, and `take` are now deprecated
+ in favor of their `shift_` or `swap_` prefixed variants, which are more
+ explicit about their effect on the index and order of remaining items.
+ The deprecated methods will remain to guide drop-in replacements from
+ `HashMap` and `HashSet` toward the prefixed methods.
+
+## 2.1.0 (2023-10-31)
+
+- Empty slices can now be created with `map::Slice::{new, new_mut}` and
+ `set::Slice::new`. In addition, `Slice::new`, `len`, and `is_empty` are
+ now `const` functions on both types.
+
+- `IndexMap`, `IndexSet`, and their respective `Slice`s all have binary
+ search methods for sorted data: map `binary_search_keys` and set
+ `binary_search` for plain comparison, `binary_search_by` for custom
+ comparators, `binary_search_by_key` for key extraction, and
+ `partition_point` for boolean conditions.
+
+## 2.0.2 (2023-09-29)
+
+- The `hashbrown` dependency has been updated to version 0.14.1 to
+ complete the support for Rust 1.63.
+
+## 2.0.1 (2023-09-27)
+
+- **MSRV**: Rust 1.63.0 is now supported as well, pending publication of
+ `hashbrown`'s relaxed MSRV (or use cargo `--ignore-rust-version`).
+
+## 2.0.0 (2023-06-23)
+
+- **MSRV**: Rust 1.64.0 or later is now required.
+
+- The `"std"` feature is no longer auto-detected. It is included in the
+ default feature set, or else can be enabled like any other Cargo feature.
+
+- The `"serde-1"` feature has been removed, leaving just the optional
+ `"serde"` dependency to be enabled like a feature itself.
+
+- `IndexMap::get_index_mut` now returns `Option<(&K, &mut V)>`, changing
+ the key part from `&mut K` to `&K`. There is also a new alternative
+ `MutableKeys::get_index_mut2` to access the former behavior.
+
+- The new `map::Slice<K, V>` and `set::Slice<T>` offer a linear view of maps
+ and sets, behaving a lot like normal `[(K, V)]` and `[T]` slices. Notably,
+ comparison traits like `Eq` only consider items in order, rather than hash
+ lookups, and slices even implement `Hash`.
+
+- `IndexMap` and `IndexSet` now have `sort_by_cached_key` and
+ `par_sort_by_cached_key` methods which perform stable sorts in place
+ using a key extraction function.
+
+- `IndexMap` and `IndexSet` now have `reserve_exact`, `try_reserve`, and
+ `try_reserve_exact` methods that correspond to the same methods on `Vec`.
+ However, exactness only applies to the direct capacity for items, while the
+ raw hash table still follows its own rules for capacity and load factor.
+
+- The `Equivalent` trait is now re-exported from the `equivalent` crate,
+ intended as a common base to allow types to work with multiple map types.
+
+- The `hashbrown` dependency has been updated to version 0.14.
+
+- The `serde_seq` module has been moved from the crate root to below the
+ `map` module.
+
+## 1.9.3 (2023-03-24)
+
+- Bump the `rustc-rayon` dependency, for compiler use only.
+
+## 1.9.2 (2022-11-17)
+
+- `IndexMap` and `IndexSet` both implement `arbitrary::Arbitrary<'_>` and
+ `quickcheck::Arbitrary` if those optional dependency features are enabled.
+
+## 1.9.1 (2022-06-21)
+
+- The MSRV now allows Rust 1.56.0 as well. However, currently `hashbrown`
+ 0.12.1 requires 1.56.1, so users on 1.56.0 should downgrade that to 0.12.0
+ until there is a later published version relaxing its requirement.
+
+## 1.9.0 (2022-06-16)
+
+- **MSRV**: Rust 1.56.1 or later is now required.
+
+- The `hashbrown` dependency has been updated to version 0.12.
+
+- `IterMut` and `ValuesMut` now implement `Debug`.
+
+- The new `IndexMap::shrink_to` and `IndexSet::shrink_to` methods shrink
+ the capacity with a lower bound.
+
+- The new `IndexMap::move_index` and `IndexSet::move_index` methods change
+ the position of an item from one index to another, shifting the items
+ between to accommodate the move.
+
+## 1.8.2 (2022-05-27)
+
+- Bump the `rustc-rayon` dependency, for compiler use only.
+
+## 1.8.1 (2022-03-29)
+
+- The new `IndexSet::replace_full` will return the index of the item along
+ with the replaced value, if any, by @zakcutner in PR [222].
+
+[222]: https://github.com/indexmap-rs/indexmap/pull/222
+
+## 1.8.0 (2022-01-07)
+
+- The new `IndexMap::into_keys` and `IndexMap::into_values` will consume
+ the map into keys or values, respectively, matching Rust 1.54's `HashMap`
+ methods, by @taiki-e in PR [195].
+
+- More of the iterator types implement `Debug`, `ExactSizeIterator`, and
+ `FusedIterator`, by @cuviper in PR [196].
+
+- `IndexMap` and `IndexSet` now implement rayon's `ParallelDrainRange`,
+ by @cuviper in PR [197].
+
+- `IndexMap::with_hasher` and `IndexSet::with_hasher` are now `const`
+ functions, allowing static maps and sets, by @mwillsey in PR [203].
+
+- `IndexMap` and `IndexSet` now implement `From` for arrays, matching
+ Rust 1.56's implementation for `HashMap`, by @rouge8 in PR [205].
+
+- `IndexMap` and `IndexSet` now have methods `sort_unstable_keys`,
+ `sort_unstable_by`, `sorted_unstable_by`, and `par_*` equivalents,
+ which sort in-place without preserving the order of equal items, by
+ @bhgomes in PR [211].
+
+[195]: https://github.com/indexmap-rs/indexmap/pull/195
+[196]: https://github.com/indexmap-rs/indexmap/pull/196
+[197]: https://github.com/indexmap-rs/indexmap/pull/197
+[203]: https://github.com/indexmap-rs/indexmap/pull/203
+[205]: https://github.com/indexmap-rs/indexmap/pull/205
+[211]: https://github.com/indexmap-rs/indexmap/pull/211
+
+## 1.7.0 (2021-06-29)
+
+- **MSRV**: Rust 1.49 or later is now required.
+
+- The `hashbrown` dependency has been updated to version 0.11.
+
+## 1.6.2 (2021-03-05)
+
+- Fixed to match `std` behavior, `OccupiedEntry::key` now references the
+ existing key in the map instead of the lookup key, by @cuviper in PR [170].
+
+- The new `Entry::or_insert_with_key` matches Rust 1.50's `Entry` method,
+ passing `&K` to the callback to create a value, by @cuviper in PR [175].
+
+[170]: https://github.com/indexmap-rs/indexmap/pull/170
+[175]: https://github.com/indexmap-rs/indexmap/pull/175
+
+## 1.6.1 (2020-12-14)
+
+- The new `serde_seq` module implements `IndexMap` serialization as a
+ sequence to ensure order is preserved, by @cuviper in PR [158].
+
+- New methods on maps and sets work like the `Vec`/slice methods by the same name:
+ `truncate`, `split_off`, `first`, `first_mut`, `last`, `last_mut`, and
+ `swap_indices`, by @cuviper in PR [160].
+
+[158]: https://github.com/indexmap-rs/indexmap/pull/158
+[160]: https://github.com/indexmap-rs/indexmap/pull/160
+
+## 1.6.0 (2020-09-05)
+
+- **MSRV**: Rust 1.36 or later is now required.
+
+- The `hashbrown` dependency has been updated to version 0.9.
+
+## 1.5.2 (2020-09-01)
+
+- The new "std" feature will force the use of `std` for users that explicitly
+ want the default `S = RandomState`, bypassing the autodetection added in 1.3.0,
+ by @cuviper in PR [145].
+
+[145]: https://github.com/indexmap-rs/indexmap/pull/145
+
+## 1.5.1 (2020-08-07)
+
+- Values can now be indexed by their `usize` position by @cuviper in PR [132].
+
+- Some of the generic bounds have been relaxed to match `std` by @cuviper in PR [141].
+
+- `drain` now accepts any `R: RangeBounds<usize>` by @cuviper in PR [142].
+
+[132]: https://github.com/indexmap-rs/indexmap/pull/132
+[141]: https://github.com/indexmap-rs/indexmap/pull/141
+[142]: https://github.com/indexmap-rs/indexmap/pull/142
+
+## 1.5.0 (2020-07-17)
+
+- **MSRV**: Rust 1.32 or later is now required.
+
+- The inner hash table is now based on `hashbrown` by @cuviper in PR [131].
+ This also completes the method `reserve` and adds `shrink_to_fit`.
+
+- Add new methods `get_key_value`, `remove_entry`, `swap_remove_entry`,
+ and `shift_remove_entry`, by @cuviper in PR [136]
+
+- `Clone::clone_from` reuses allocations by @cuviper in PR [125]
+
+- Add new method `reverse` by @linclelinkpart5 in PR [128]
+
+[125]: https://github.com/indexmap-rs/indexmap/pull/125
+[128]: https://github.com/indexmap-rs/indexmap/pull/128
+[131]: https://github.com/indexmap-rs/indexmap/pull/131
+[136]: https://github.com/indexmap-rs/indexmap/pull/136
+
+## 1.4.0 (2020-06-01)
+
+- Add new method `get_index_of` by @Thermatrix in PR [115] and [120]
+
+- Fix build script rebuild-if-changed configuration to use "build.rs";
+ fixes issue [123]. Fix by @cuviper.
+
+- Dev-dependencies (rand and quickcheck) have been updated. The crate's tests
+ now run using Rust 1.32 or later (MSRV for building the crate has not changed).
+ by @kjeremy and @bluss
+
+[123]: https://github.com/indexmap-rs/indexmap/issues/123
+[115]: https://github.com/indexmap-rs/indexmap/pull/115
+[120]: https://github.com/indexmap-rs/indexmap/pull/120
+
+## 1.3.2 (2020-02-05)
+
+- Maintenance update to regenerate the published `Cargo.toml`.
+
+## 1.3.1 (2020-01-15)
+
+- Maintenance update for formatting and `autocfg` 1.0.
+
+## 1.3.0 (2019-10-18)
+
+- The deprecation messages in the previous version have been removed.
+ (The methods have not otherwise changed.) Docs for removal methods have been
+ improved.
+- From Rust 1.36, this crate supports being built **without std**, requiring
+ `alloc` instead. This is enabled automatically when it is detected that
+ `std` is not available. There is no crate feature to enable/disable to
+ trigger this. The new build-dep `autocfg` enables this.
+
+## 1.2.0 (2019-09-08)
+
+- Plain `.remove()` now has a deprecation message, it informs the user
+ about picking one of the removal functions `swap_remove` and `shift_remove`
+ which have different performance and order semantics.
+ Plain `.remove()` will not be removed, the warning message and method
+ will remain until further.
+
+- Add new method `shift_remove` for order preserving removal on the map,
+ and `shift_take` for the corresponding operation on the set.
+
+- Add methods `swap_remove`, `swap_remove_entry` to `Entry`.
+
+- Fix indexset/indexmap to support full paths, like `indexmap::indexmap!()`
+
+- Internal improvements: fix warnings, deprecations and style lints
+
+## 1.1.0 (2019-08-20)
+
+- Added optional feature `"rayon"` that adds parallel iterator support
+ to `IndexMap` and `IndexSet` using Rayon. This includes all the regular
+ iterators in parallel versions, and parallel sort.
+
+- Implemented `Clone` for `map::{Iter, Keys, Values}` and
+ `set::{Difference, Intersection, Iter, SymmetricDifference, Union}`
+
+- Implemented `Debug` for `map::{Entry, IntoIter, Iter, Keys, Values}` and
+ `set::{Difference, Intersection, IntoIter, Iter, SymmetricDifference, Union}`
+
+- Serde trait `IntoDeserializer` are implemented for `IndexMap` and `IndexSet`.
+
+- Minimum Rust version requirement increased to Rust 1.30 for development builds.
+
+## 1.0.2 (2018-10-22)
+
+- The new methods `IndexMap::insert_full` and `IndexSet::insert_full` are
+ both like `insert` with the index included in the return value.
+
+- The new method `Entry::and_modify` can be used to modify occupied
+ entries, matching the new methods of `std` maps in Rust 1.26.
+
+- The new method `Entry::or_default` inserts a default value in unoccupied
+ entries, matching the new methods of `std` maps in Rust 1.28.
+
+## 1.0.1 (2018-03-24)
+
+- Document Rust version policy for the crate (see rustdoc)
+
+## 1.0.0 (2018-03-11)
+
+- This is the 1.0 release for `indexmap`! (the crate and datastructure
+ formerly known as “ordermap”)
+- `OccupiedEntry::insert` changed its signature, to use `&mut self` for
+ the method receiver, matching the equivalent method for a standard
+ `HashMap`. Thanks to @dtolnay for finding this bug.
+- The deprecated old names from ordermap were removed: `OrderMap`,
+ `OrderSet`, `ordermap!{}`, `orderset!{}`. Use the new `IndexMap`
+ etc names instead.
+
+## 0.4.1 (2018-02-14)
+
+- Renamed crate to `indexmap`; the `ordermap` crate is now deprecated
+ and the types `OrderMap/Set` now have a deprecation notice.
+
+## 0.4.0 (2018-02-02)
+
+- This is the last release series for this `ordermap` under that name,
+ because the crate is **going to be renamed** to `indexmap` (with types
+ `IndexMap`, `IndexSet`) and no change in functionality!
+- The map and its associated structs moved into the `map` submodule of the
+ crate, so that the map and set are symmetric
+
+ + The iterators, `Entry` and other structs are now under `ordermap::map::`
+
+- Internally refactored `OrderMap<K, V, S>` so that all the main algorithms
+ (insertion, lookup, removal etc) that don't use the `S` parameter (the
+ hasher) are compiled without depending on `S`, which reduces generics bloat.
+
+- `Entry<K, V>` no longer has a type parameter `S`, which is just like
+ the standard `HashMap`'s entry.
+
+- Minimum Rust version requirement increased to Rust 1.18
+
+## 0.3.5 (2018-01-14)
+
+- Documentation improvements
+
+## 0.3.4 (2018-01-04)
+
+- The `.retain()` methods for `OrderMap` and `OrderSet` now
+ traverse the elements in order, and the retained elements **keep their order**
+- Added new methods `.sort_by()`, `.sort_keys()` to `OrderMap` and
+ `.sort_by()`, `.sort()` to `OrderSet`. These methods allow you to
+ sort the maps in place efficiently.
+
+## 0.3.3 (2017-12-28)
+
+- Document insertion behaviour better by @lucab
+- Updated dependences (no feature changes) by @ignatenkobrain
+
+## 0.3.2 (2017-11-25)
+
+- Add `OrderSet` by @cuviper!
+- `OrderMap::drain` is now (too) a double ended iterator.
+
+## 0.3.1 (2017-11-19)
+
+- In all ordermap iterators, forward the `collect` method to the underlying
+ iterator as well.
+- Add crates.io categories.
+
+## 0.3.0 (2017-10-07)
+
+- The methods `get_pair`, `get_pair_index` were both replaced by
+ `get_full` (and the same for the mutable case).
+- Method `swap_remove_pair` replaced by `swap_remove_full`.
+- Add trait `MutableKeys` for opt-in mutable key access. Mutable key access
+ is only possible through the methods of this extension trait.
+- Add new trait `Equivalent` for key equivalence. This extends the
+ `Borrow` trait mechanism for `OrderMap::get` in a backwards compatible
+ way, just some minor type inference related issues may become apparent.
+ See [#10] for more information.
+- Implement `Extend<(&K, &V)>` by @xfix.
+
+[#10]: https://github.com/indexmap-rs/indexmap/pull/10
+
+## 0.2.13 (2017-09-30)
+
+- Fix deserialization to support custom hashers by @Techcable.
+- Add methods `.index()` on the entry types by @garro95.
+
+## 0.2.12 (2017-09-11)
+
+- Add methods `.with_hasher()`, `.hasher()`.
+
+## 0.2.11 (2017-08-29)
+
+- Support `ExactSizeIterator` for the iterators. By @Binero.
+- Use `Box<[Pos]>` internally, saving a word in the `OrderMap` struct.
+- Serde support, with crate feature `"serde-1"`. By @xfix.
+
+## 0.2.10 (2017-04-29)
+
+- Add iterator `.drain(..)` by @stevej.
+
+## 0.2.9 (2017-03-26)
+
+- Add method `.is_empty()` by @overvenus.
+- Implement `PartialEq, Eq` by @overvenus.
+- Add method `.sorted_by()`.
+
+## 0.2.8 (2017-03-01)
+
+- Add iterators `.values()` and `.values_mut()`.
+- Fix compatibility with 32-bit platforms.
+
+## 0.2.7 (2016-11-02)
+
+- Add `.retain()`.
+
+## 0.2.6 (2016-11-02)
+
+- Add `OccupiedEntry::remove_entry` and other minor entry methods,
+ so that it now has all the features of `HashMap`'s entries.
+
+## 0.2.5 (2016-10-31)
+
+- Improved `.pop()` slightly.
+
+## 0.2.4 (2016-10-22)
+
+- Improved performance of `.insert()` ([#3]) by @pczarn.
+
+[#3]: https://github.com/indexmap-rs/indexmap/pull/3
+
+## 0.2.3 (2016-10-11)
+
+- Generalize `Entry` for now, so that it works on hashmaps with non-default
+ hasher. However, there's a lingering compat issue since libstd `HashMap`
+ does not parameterize its entries by the hasher (`S` typarm).
+- Special case some iterator methods like `.nth()`.
+
+## 0.2.2 (2016-10-02)
+
+- Disable the verbose `Debug` impl by default.
+
+## 0.2.1 (2016-10-02)
+
+- Fix doc links and clarify docs.
+
+## 0.2.0 (2016-10-01)
+
+- Add more `HashMap` methods & compat with its API.
+- Experimental support for `.entry()` (the simplest parts of the API).
+- Add `.reserve()` (placeholder impl).
+- Add `.remove()` as synonym for `.swap_remove()`.
+- Changed `.insert()` to swap value if the entry already exists, and
+ return `Option`.
+- Experimental support as an *indexed* hash map! Added methods
+ `.get_index()`, `.get_index_mut()`, `.swap_remove_index()`,
+ `.get_pair_index()`, `.get_pair_index_mut()`.
+
+## 0.1.2 (2016-09-19)
+
+- Implement the 32/32 split idea for `Pos` which improves cache utilization
+ and lookup performance.
+
+## 0.1.1 (2016-09-16)
+
+- Initial release.