logo
pub struct Sender<T> { /* private fields */ }
Expand description

The sending side of a channel.

Senders can be cloned and shared among threads. When all senders associated with a channel are dropped, the channel becomes closed.

The channel can also be closed manually by calling Sender::close().

Implementations

Attempts to send a message into the channel.

If the channel is full or closed, this method returns an error.

Examples
use async_channel::{bounded, TrySendError};

let (s, r) = bounded(1);

assert_eq!(s.try_send(1), Ok(()));
assert_eq!(s.try_send(2), Err(TrySendError::Full(2)));

drop(r);
assert_eq!(s.try_send(3), Err(TrySendError::Closed(3)));

Sends a message into the channel.

If the channel is full, this method waits until there is space for a message.

If the channel is closed, this method returns an error.

Examples
use async_channel::{unbounded, SendError};

let (s, r) = unbounded();

assert_eq!(s.send(1).await, Ok(()));
drop(r);
assert_eq!(s.send(2).await, Err(SendError(2)));

Closes the channel.

Returns true if this call has closed the channel and it was not closed already.

The remaining messages can still be received.

Examples
use async_channel::{unbounded, RecvError};

let (s, r) = unbounded();
assert_eq!(s.send(1).await, Ok(()));
assert!(s.close());

assert_eq!(r.recv().await, Ok(1));
assert_eq!(r.recv().await, Err(RecvError));

Returns true if the channel is closed.

Examples
use async_channel::{unbounded, RecvError};

let (s, r) = unbounded::<()>();
assert!(!s.is_closed());

drop(r);
assert!(s.is_closed());

Returns true if the channel is empty.

Examples
use async_channel::unbounded;

let (s, r) = unbounded();

assert!(s.is_empty());
s.send(1).await;
assert!(!s.is_empty());

Returns true if the channel is full.

Unbounded channels are never full.

Examples
use async_channel::bounded;

let (s, r) = bounded(1);

assert!(!s.is_full());
s.send(1).await;
assert!(s.is_full());

Returns the number of messages in the channel.

Examples
use async_channel::unbounded;

let (s, r) = unbounded();
assert_eq!(s.len(), 0);

s.send(1).await;
s.send(2).await;
assert_eq!(s.len(), 2);

Returns the channel capacity if it’s bounded.

Examples
use async_channel::{bounded, unbounded};

let (s, r) = bounded::<i32>(5);
assert_eq!(s.capacity(), Some(5));

let (s, r) = unbounded::<i32>();
assert_eq!(s.capacity(), None);

Returns the number of receivers for the channel.

Examples
use async_channel::unbounded;

let (s, r) = unbounded::<()>();
assert_eq!(s.receiver_count(), 1);

let r2 = r.clone();
assert_eq!(s.receiver_count(), 2);

Returns the number of senders for the channel.

Examples
use async_channel::unbounded;

let (s, r) = unbounded::<()>();
assert_eq!(s.sender_count(), 1);

let s2 = s.clone();
assert_eq!(s.sender_count(), 2);

Trait Implementations

Returns a copy of the value. Read more

Performs copy-assignment from source. Read more

Formats the value using the given formatter. Read more

Executes the destructor for this type. Read more

Auto Trait Implementations

Blanket Implementations

Gets the TypeId of self. Read more

Immutably borrows from an owned value. Read more

Mutably borrows from an owned value. Read more

Returns the argument unchanged.

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

The resulting type after obtaining ownership.

Creates owned data from borrowed data, usually by cloning. Read more

Uses borrowed data to replace owned data, usually by cloning. Read more

The type returned in the event of a conversion error.

Performs the conversion.

The type returned in the event of a conversion error.

Performs the conversion.