# futures_util::future::Join4 - Rust
API documentation for the Rust `Join4` struct in crate `futures_util`.
Keywords: rust, rustlang, rust-lang, Join4

# Struct futures_util::future::Join4 [−] [src]

    #[must_use = "futures do nothing unless you `.await` or poll them"]pub struct Join4<Fut1: Future, Fut2: Future, Fut3: Future, Fut4: Future> { /* fields omitted */ }

Future for the `join4` function.

## Trait Implementations

### `impl<Fut1, Fut2, Fut3, Fut4> Debug for Join4<Fut1, Fut2, Fut3, Fut4> where
Fut1: Future + Debug,
Fut1::Output: Debug,
Fut2: Future + Debug,
Fut2::Output: Debug,
Fut3: Future + Debug,
Fut3::Output: Debug,
Fut4: Future + Debug,
Fut4::Output: Debug,` [src]

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

Formats the value using the given formatter. Read more

### `impl<Fut1: FusedFuture, Fut2: FusedFuture, Fut3: FusedFuture, Fut4: FusedFuture> FusedFuture for Join4<Fut1, Fut2, Fut3, Fut4>` [src]

#### `fn is_terminated(&self) -> bool` [src]

Returns `true` if the underlying future should no longer be polled.

### `impl<Fut1: Future, Fut2: Future, Fut3: Future, Fut4: Future> Future for Join4<Fut1, Fut2, Fut3, Fut4>` [src]

#### `type Output = (Fut1::Output, Fut2::Output, Fut3::Output, Fut4::Output)`

The type of value produced on completion.

#### `fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output>` [src]

Attempt to resolve the future to a final value, registering the current task for wakeup if the value is not yet available. Read more

### `impl<'__pin, Fut1: Future, Fut2: Future, Fut3: Future, Fut4: Future> Unpin for Join4<Fut1, Fut2, Fut3, Fut4> where
__Origin<'__pin, Fut1, Fut2, Fut3, Fut4>: Unpin,` [src]

## Auto Trait Implementations

### `impl<Fut1, Fut2, Fut3, Fut4> RefUnwindSafe for Join4<Fut1, Fut2, Fut3, Fut4> where
Fut1: RefUnwindSafe,
Fut2: RefUnwindSafe,
Fut3: RefUnwindSafe,
Fut4: RefUnwindSafe,
<Fut1 as Future>::Output: RefUnwindSafe,
<Fut2 as Future>::Output: RefUnwindSafe,
<Fut3 as Future>::Output: RefUnwindSafe,
<Fut4 as Future>::Output: RefUnwindSafe,` [src]

### `impl<Fut1, Fut2, Fut3, Fut4> Send for Join4<Fut1, Fut2, Fut3, Fut4> where
Fut1: Send,
Fut2: Send,
Fut3: Send,
Fut4: Send,
<Fut1 as Future>::Output: Send,
<Fut2 as Future>::Output: Send,
<Fut3 as Future>::Output: Send,
<Fut4 as Future>::Output: Send,` [src]

### `impl<Fut1, Fut2, Fut3, Fut4> Sync for Join4<Fut1, Fut2, Fut3, Fut4> where
Fut1: Sync,
Fut2: Sync,
Fut3: Sync,
Fut4: Sync,
<Fut1 as Future>::Output: Sync,
<Fut2 as Future>::Output: Sync,
<Fut3 as Future>::Output: Sync,
<Fut4 as Future>::Output: Sync,` [src]

### `impl<Fut1, Fut2, Fut3, Fut4> UnwindSafe for Join4<Fut1, Fut2, Fut3, Fut4> where
Fut1: UnwindSafe,
Fut2: UnwindSafe,
Fut3: UnwindSafe,
Fut4: UnwindSafe,
<Fut1 as Future>::Output: UnwindSafe,
<Fut2 as Future>::Output: UnwindSafe,
<Fut3 as Future>::Output: UnwindSafe,
<Fut4 as Future>::Output: UnwindSafe,` [src]

## Blanket Implementations

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

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

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

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

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

Immutably borrows from an owned value. Read more

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

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

Mutably borrows from an owned value. Read more

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

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

Performs the conversion.

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

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

Performs the conversion.

### `impl<F> IntoFuture for F where
F: Future,` [src]

#### `type Output = <F as Future>::Output`

🔬 This is a nightly-only experimental API. (`into_future`)

The output that the future will produce on completion.

#### `type Future = F`

🔬 This is a nightly-only experimental API. (`into_future`)

Which kind of future are we turning this into?

#### `pub fn into_future(self) -> <F as IntoFuture>::Future` [src]

🔬 This is a nightly-only experimental API. (`into_future`)

Creates a future from a value.

### `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.

#### `pub 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.

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

Performs the conversion.