# ArcSwap
[](https://github.com/vorner/arc-swap/actions)
[](https://codecov.io/gh/vorner/arc-swap)
[](https://docs.rs/arc-swap)
This provides something similar to what `RwLock<Arc<T>>` is or what
`Atomic<Arc<T>>` would be if it existed, optimized for read-mostly write-seldom
scenarios, with consistent performance characteristics.
Read [the documentation](https://docs.rs/arc-swap) before using.
## Rust version policy
The 1. version will build on any edition 2018 capable compiler. This does not
include:
* Tests. Tests build and run on recent compilers, mostly because of
dependencies.
* Additional feature flags. Most feature flags are guaranteed to build since the
version they are introduced. Experimental features are without any guarantees.
## License
Licensed under either of
* Apache License, Version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or http://www.apache.org/licenses/LICENSE-2.0)
* MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)
at your option.
### Contribution
Unless you explicitly state otherwise, any contribution intentionally
submitted for inclusion in the work by you, as defined in the Apache-2.0
license, shall be dual licensed as above, without any additional terms
or conditions.
[`Arc`]: https://doc.rust-lang.org/std/sync/struct.Arc.html
[`AtomicPtr`]: https://doc.rust-lang.org/std/sync/atomic/struct.AtomicPtr.html
[`ArcSwap`]: https://docs.rs/arc-swap/*/arc_swap/type.ArcSwap.html