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# Releases
## 2.2.6
- Added trait `MutableValues` for opt-in mutable access to set values.
## 2.2.5
- Added optional `borsh` serialization support.
## 2.2.4
- 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
- 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
- Added indexing methods to raw entries: `RawEntryBuilder::from_hash_full`,
`RawEntryBuilder::index_from_hash`, and `RawEntryMut::index`.
## 2.2.1
- 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
- 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
- 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
- The `hashbrown` dependency has been updated to version 0.14.1 to
complete the support for Rust 1.63.
## 2.0.1
- **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
- **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
- Bump the `rustc-rayon` dependency, for compiler use only.
## 1.9.2
- `IndexMap` and `IndexSet` both implement `arbitrary::Arbitrary<'_>` and
`quickcheck::Arbitrary` if those optional dependency features are enabled.
## 1.9.1
- 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
- **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
- Bump the `rustc-rayon` dependency, for compiler use only.
## 1.8.1
- The new `IndexSet::replace_full` will return the index of the item along
with the replaced value, if any, by @zakcutner in PR [222].
## 1.8.0
- 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].
## 1.7.0
- **MSRV**: Rust 1.49 or later is now required.
- The `hashbrown` dependency has been updated to version 0.11.
## 1.6.2
- 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].
## 1.6.1
- 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].
## 1.6.0
- **MSRV**: Rust 1.36 or later is now required.
- The `hashbrown` dependency has been updated to version 0.9.
## 1.5.2
- 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].
## 1.5.1
- 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].
## 1.5.0
- **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]
## 1.4.0
- 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
## 1.3.2
- Maintenance update to regenerate the published `Cargo.toml`.
## 1.3.1
- Maintenance update for formatting and `autocfg` 1.0.
## 1.3.0
- 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
- 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
- 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
- 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
- Document Rust version policy for the crate (see rustdoc)
## 1.0.0
- 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
- Renamed crate to `indexmap`; the `ordermap` crate is now deprecated
and the types `OrderMap/Set` now have a deprecation notice.
## 0.4.0
- 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
- Documentation improvements
## 0.3.4
- 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
- Document insertion behaviour better by @lucab
- Updated dependences (no feature changes) by @ignatenkobrain
## 0.3.2
- Add `OrderSet` by @cuviper!
- `OrderMap::drain` is now (too) a double ended iterator.
## 0.3.1
- In all ordermap iterators, forward the `collect` method to the underlying
iterator as well.
- Add crates.io categories.
## 0.3.0
- 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.
## 0.2.13
- Fix deserialization to support custom hashers by @Techcable.
- Add methods `.index()` on the entry types by @garro95.
## 0.2.12
- Add methods `.with_hasher()`, `.hasher()`.
## 0.2.11
- 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
- Add iterator `.drain(..)` by @stevej.
## 0.2.9
- Add method `.is_empty()` by @overvenus.
- Implement `PartialEq, Eq` by @overvenus.
- Add method `.sorted_by()`.
## 0.2.8
- Add iterators `.values()` and `.values_mut()`.
- Fix compatibility with 32-bit platforms.
## 0.2.7
- Add `.retain()`.
## 0.2.6
- Add `OccupiedEntry::remove_entry` and other minor entry methods,
so that it now has all the features of `HashMap`'s entries.
## 0.2.5
- Improved `.pop()` slightly.
## 0.2.4
- Improved performance of `.insert()` ([#3]) by @pczarn.
## 0.2.3
- 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
- Disable the verbose `Debug` impl by default.
## 0.2.1
- Fix doc links and clarify docs.
## 0.2.0
- 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
- Implement the 32/32 split idea for `Pos` which improves cache utilization
and lookup performance.
## 0.1.1
- Initial release.