Module watchable

Watchable values.

A Watchable exists to keep track of a value which may change over time. It allows observers to be notified of changes to the value. The aim is to always be aware of the last value, not to observe every value change.

In that way, a Watchable is like a [tokio::sync::broadcast::Sender] (and a Watcher is like a [tokio::sync::broadcast::Receiver]), except that there’s no risk of the channel filling up, but instead you might miss items.

Structs

• Disconnected
  The error for when a Watcher is disconnected from its underlying Watchable value, because of that watchable having been dropped.
• WatchInitializedFut
  Future returning the current or next value that’s Some value. in a Watcher.
• WatchNextFut
  Future returning the next item after the current one in a Watcher.
• Watchable
  A wrapper around a value that notifies Watchers when the value is modified.
• Watcher
  An observer for a value.
• WatcherStream
  A stream for a Watcher’s next values.