arc-swap 0.4.7

Atomically swappable Arc
Documentation 
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# ArcSwap

[![Travis Build Status](https://api.travis-ci.org/vorner/arc-swap.png?branch=master)](https://travis-ci.org/vorner/arc-swap)
[![AppVeyor Build status](https://ci.appveyor.com/api/projects/status/d9p4equeuhymfny6/branch/master?svg=true)](https://ci.appveyor.com/project/vorner/arc-swap/branch/master)

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

There's no hard policy yet. However, currently the crate builds with Rust 1.26
and is tested for that. There would have to be a very good reason to increase
the required version.

## 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