| # Want |
| |
| - [Crates.io](https://crates.io/crates/want) |
| - [Docs](https://docs.rs/want) |
| |
| A `Future`s channel-like utility to signal when a value is wanted. |
| |
| Futures are supposed to be lazy, and only starting work if `Future::poll` |
| is called. The same is true of `Stream`s, but when using a channel as |
| a `Stream`, it can be hard to know if the receiver is ready for the next |
| value. |
| |
| Put another way, given a `(tx, rx)` from `futures::sync::mpsc::channel()`, |
| how can the sender (`tx`) know when the receiver (`rx`) actually wants more |
| work to be produced? Just because there is room in the channel buffer |
| doesn't mean the work would be used by the receiver. |
| |
| This is where something like `want` comes in. Added to a channel, you can |
| make sure that the `tx` only creates the message and sends it when the `rx` |
| has `poll()` for it, and the buffer was empty. |
| |
| ## License |
| |
| `want` is provided under the MIT license. See [LICENSE](LICENSE). |
