230 lines
6.0 KiB
Markdown
230 lines
6.0 KiB
Markdown
# Changelog
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## Unreleased
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-
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## 1.19.0
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- Use `portable-atomic` instead of `atomic-polyfill`, [#251](https://github.com/matklad/once_cell/pull/251).
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## 1.18.0
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- `MSRV` is updated to 1.60.0 to take advantage of `dep:` syntax for cargo features,
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removing "implementation details" from publicly visible surface.
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## 1.17.2
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- Avoid unnecessary synchronization in `Lazy::{force,deref}_mut()`, [#231](https://github.com/matklad/once_cell/pull/231).
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## 1.17.1
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- Make `OnceRef` implementation compliant with [strict provenance](https://github.com/rust-lang/rust/issues/95228).
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## 1.17.0
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- Add `race::OnceRef` for storing a `&'a T`.
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## 1.16.0
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- Add `no_std` implementation based on `critical-section`,
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[#195](https://github.com/matklad/once_cell/pull/195).
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- Deprecate `atomic-polyfill` feature (use the new `critical-section` instead)
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## 1.15.0
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- Increase minimal supported Rust version to 1.56.0.
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- Implement `UnwindSafe` even if the `std` feature is disabled.
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## 1.14.0
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- Add extension to `unsync` and `sync` `Lazy` mut API:
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- `force_mut`
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- `get_mut`
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## 1.13.1
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- Make implementation compliant with [strict provenance](https://github.com/rust-lang/rust/issues/95228).
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- Upgrade `atomic-polyfill` to `1.0`
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## 1.13.0
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- Add `Lazy::get`, similar to `OnceCell::get`.
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## 1.12.1
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- Remove incorrect `debug_assert`.
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## 1.12.0
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- Add `OnceCell::wait`, a blocking variant of `get`.
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## 1.11.0
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- Add `OnceCell::with_value` to create initialized `OnceCell` in `const` context.
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- Improve `Clone` implementation for `OnceCell`.
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- Rewrite `parking_lot` version on top of `parking_lot_core`, for even smaller cells!
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## 1.10.0
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- upgrade `parking_lot` to `0.12.0` (note that this bumps MSRV with `parking_lot` feature enabled to `1.49.0`).
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## 1.9.0
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- Added an `atomic-polyfill` optional dependency to compile `race` on platforms without atomics
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## 1.8.0
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- Add `try_insert` API -- a version of `set` that returns a reference.
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## 1.7.2
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- Improve code size when using parking_lot feature.
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## 1.7.1
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- Fix `race::OnceBox<T>` to also impl `Default` even if `T` doesn't impl `Default`.
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## 1.7.0
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- Hide the `race` module behind (default) `race` feature.
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Turns out that adding `race` by default was a breaking change on some platforms without atomics.
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In this release, we make the module opt-out.
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Technically, this is a breaking change for those who use `race` with `no_default_features`.
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Given that the `race` module itself only several days old, the breakage is deemed acceptable.
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## 1.6.0
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- Add `Lazy::into_value`
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- Stabilize `once_cell::race` module for "first one wins" no_std-compatible initialization flavor.
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- Migrate from deprecated `compare_and_swap` to `compare_exchange`.
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## 1.5.2
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- `OnceBox` API uses `Box<T>`.
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This a breaking change to unstable API.
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## 1.5.1
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- MSRV is increased to `1.36.0`.
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- document `once_cell::race` module.
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- introduce `alloc` feature for `OnceBox`.
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- fix `OnceBox::set`.
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## 1.5.0
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- add new `once_cell::race` module for "first one wins" no_std-compatible initialization flavor.
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The API is provisional, subject to change and is gated by the `unstable` cargo feature.
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## 1.4.1
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- upgrade `parking_lot` to `0.11.0`
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- make `sync::OnceCell<T>` pass https://doc.rust-lang.org/nomicon/dropck.html#an-escape-hatch[dropck] with `parking_lot` feature enabled.
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This fixes a (minor) semver-incompatible changed introduced in `1.4.0`
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## 1.4.0
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- upgrade `parking_lot` to `0.10` (note that this bumps MSRV with `parking_lot` feature enabled to `1.36.0`).
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- add `OnceCell::take`.
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- upgrade crossbeam utils (private dependency) to `0.7`.
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## 1.3.1
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- remove unnecessary `F: fmt::Debug` bound from `impl fmt::Debug for Lazy<T, F>`.
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## 1.3.0
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- `Lazy<T>` now implements `DerefMut`.
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- update implementation according to the latest changes in `std`.
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## 1.2.0
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- add `sync::OnceCell::get_unchecked`.
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## 1.1.0
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- implement `Default` for `Lazy`: it creates an empty `Lazy<T>` which is initialized with `T::default` on first access.
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- add `OnceCell::get_mut`.
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## 1.0.2
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- actually add `#![no_std]` attribute if std feature is not enabled.
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## 1.0.1
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- fix unsoundness in `Lazy<T>` if the initializing function panics. Thanks [@xfix](https://github.com/xfix)!
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- implement `RefUnwindSafe` for `Lazy`.
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- share more code between `std` and `parking_lot` implementations.
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- add F.A.Q section to the docs.
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## 1.0.0
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- remove `parking_lot` from the list of default features.
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- add `std` default feature. Without `std`, only `unsync` module is supported.
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- implement `Eq` for `OnceCell`.
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- fix wrong `Sync` bound on `sync::Lazy`.
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- run the whole test suite with miri.
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## 0.2.7
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- New implementation of `sync::OnceCell` if `parking_lot` feature is disabled.
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It now employs a hand-rolled variant of `std::sync::Once`.
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- `sync::OnceCell::get_or_try_init` works without `parking_lot` as well!
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- document the effects of `parking_lot` feature: same performance but smaller types.
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## 0.2.6
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- Updated `Lazy`'s `Deref` impl to requires only `FnOnce` instead of `Fn`
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## 0.2.5
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- `Lazy` requires only `FnOnce` instead of `Fn`
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## 0.2.4
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- nicer `fmt::Debug` implementation
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## 0.2.3
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- update `parking_lot` to `0.9.0`
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- fix stacked borrows violation in `unsync::OnceCell::get`
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- implement `Clone` for `sync::OnceCell<T> where T: Clone`
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## 0.2.2
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- add `OnceCell::into_inner` which consumes a cell and returns an option
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## 0.2.1
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- implement `sync::OnceCell::get_or_try_init` if `parking_lot` feature is enabled
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- switch internal `unsafe` implementation of `sync::OnceCell` from `Once` to `Mutex`
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- `sync::OnceCell::get_or_init` is twice as fast if cell is already initialized
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- implement `std::panic::RefUnwindSafe` and `std::panic::UnwindSafe` for `OnceCell`
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- better document behavior around panics
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## 0.2.0
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- MSRV is now 1.31.1
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- `Lazy::new` and `OnceCell::new` are now const-fns
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- `unsync_lazy` and `sync_lazy` macros are removed
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## 0.1.8
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- update crossbeam-utils to 0.6
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- enable bors-ng
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## 0.1.7
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- cells implement `PartialEq` and `From`
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- MSRV is down to 1.24.1
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- update `parking_lot` to `0.7.1`
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## 0.1.6
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- `unsync::OnceCell<T>` is `Clone` if `T` is `Clone`.
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## 0.1.5
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- No changelog until this point :(
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