# [−][src]Struct crossbeam_channel::SelectedOperation

    #[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.

## Methods

### `impl<'a> SelectedOperation<'a>`[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<'a> Drop for SelectedOperation<'a>`[src]

#### `fn drop(&mut self)`[src]

Executes the destructor for this type. Read more

### `impl<'a> Debug for SelectedOperation<'a>`[src]

#### `fn fmt(&self, f: &mut Formatter) -> Result`[src]

Formats the value using the given formatter. Read more

## Auto Trait Implementations

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

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

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

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

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

## Blanket Implementations

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

#### `fn into(self) -> U`[src]

Performs the conversion.

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

#### `fn from(t: T) -> T`[src]

Performs the conversion.

### `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.

#### `fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>`[src]

Performs the conversion.

### `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.

#### `fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>`[src]

Performs the conversion.

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

#### `fn borrow_mut(&mut self) -> &mut T`[src]

Mutably borrows from an owned value. Read more

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

#### `fn borrow(&self) -> &T`[src]

Immutably borrows from an owned value. Read more

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

#### `fn type_id(&self) -> TypeId`[src]

Gets the `TypeId` of `self`. Read more

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