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tokio: add builder function for watch::Sender #5998

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Sep 19, 2023
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21 changes: 21 additions & 0 deletions tokio/src/sync/watch.rs
Original file line number Diff line number Diff line change
Expand Up @@ -869,6 +869,27 @@ impl<T> Drop for Receiver<T> {
}

impl<T> Sender<T> {
/// Creates the sending-half of the [`watch`] channel.
///
/// See documentation of [`watch::channel`] for errors when calling this function.
/// Beware that attempting to send a value when there are no receivers will
/// return an error.
///
/// [`watch`]: crate::sync::watch
/// [`watch::channel`]: crate::sync::watch
///
/// # Examples
/// ```
/// let sender = tokio::sync::watch::Sender::new(0u8);
/// assert!(sender.send(3).is_err());
/// let _rec = sender.subscribe();
/// assert!(sender.send(4).is_ok());
/// ```
pub fn new(init: T) -> Self {
let (tx, _) = channel(init);
tx
}

/// Sends a new value via the channel, notifying all receivers.
///
/// This method fails if the channel is closed, which is the case when
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