Struct crossbeam_channel::SelectedOperation[][src]

#[must_use]pub struct SelectedOperation<'a> { /* fields omitted */ }

A selected operation that needs to be completed.

To complete the operation, call send or recv.

Panics

Forgetting to complete the operation is an error and might lead to deadlocks. If a SelectedOperation is dropped without completion, a panic occurs.

Implementations

impl SelectedOperation<'_>[src]

pub fn index(&self) -> usize[src]

Returns the index of the selected operation.

Examples

use crossbeam_channel::{bounded, Select};

let (s1, r1) = bounded::<()>(0);
let (s2, r2) = bounded::<()>(0);
let (s3, r3) = bounded::<()>(1);

let mut sel = Select::new();
let oper1 = sel.send(&s1);
let oper2 = sel.recv(&r2);
let oper3 = sel.send(&s3);

// Only the last operation is ready.
let oper = sel.select();
assert_eq!(oper.index(), 2);
assert_eq!(oper.index(), oper3);

// Complete the operation.
oper.send(&s3, ()).unwrap();

pub fn send<T>(self, s: &Sender<T>, msg: T) -> Result<(), SendError<T>>[src]

Completes the send operation.

The passed Sender reference must be the same one that was used in Select::send when the operation was added.

Panics

Panics if an incorrect Sender reference is passed.

Examples

use crossbeam_channel::{bounded, Select, SendError};

let (s, r) = bounded::<i32>(0);
drop(r);

let mut sel = Select::new();
let oper1 = sel.send(&s);

let oper = sel.select();
assert_eq!(oper.index(), oper1);
assert_eq!(oper.send(&s, 10), Err(SendError(10)));

pub fn recv<T>(self, r: &Receiver<T>) -> Result<T, RecvError>[src]

Completes the receive operation.

The passed Receiver reference must be the same one that was used in Select::recv when the operation was added.

Panics

Panics if an incorrect Receiver reference is passed.

Examples

use crossbeam_channel::{bounded, Select, RecvError};

let (s, r) = bounded::<i32>(0);
drop(s);

let mut sel = Select::new();
let oper1 = sel.recv(&r);

let oper = sel.select();
assert_eq!(oper.index(), oper1);
assert_eq!(oper.recv(&r), Err(RecvError));

Trait Implementations

impl Debug for SelectedOperation<'_>[src]

impl Drop for SelectedOperation<'_>[src]

Auto Trait Implementations

impl<'a> RefUnwindSafe for SelectedOperation<'a>

impl<'a> !Send for SelectedOperation<'a>

impl<'a> !Sync for SelectedOperation<'a>

impl<'a> Unpin for SelectedOperation<'a>

impl<'a> UnwindSafe for SelectedOperation<'a>

Blanket Implementations

impl<T> Any for T where
    T: 'static + ?Sized
[src]

impl<T> Borrow<T> for T where
    T: ?Sized
[src]

impl<T> BorrowMut<T> for T where
    T: ?Sized
[src]

impl<T> From<T> for T[src]

impl<T, U> Into<U> for T where
    U: From<T>, 
[src]

impl<T, U> TryFrom<U> for T where
    U: Into<T>, 
[src]

type Error = Infallible

The type returned in the event of a conversion error.

impl<T, U> TryInto<U> for T where
    U: TryFrom<T>, 
[src]

type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.