Crate want

A 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 rx has poll() for it, and the buffer was empty.

Structs

Closed	The Taker has canceled its interest in a value.
Giver	An entity that gives a value when wanted.
SharedGiver	A cloneable Giver.
Taker	An entity that wants a value.

Functions

new	Create a new want channel.