Futures 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
Streams, 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
poll() for it, and the buffer was empty.
want is provided under the MIT license. See LICENSE.