Struct futures_util::future::MapErr

#[must_use =
  "futures/streams/sinks do nothing unless you `.await` or poll them"]pub struct MapErr<Fut, F> { /* fields omitted */ }

Future for the map_err method.

Trait Implementations

impl<Fut, F> Debug for MapErr<Fut, F> where
    Map<IntoFuture<Fut>, MapErrFn<F>>: Debug, 

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<Fut, F> FusedFuture for MapErr<Fut, F> where
    Map<IntoFuture<Fut>, MapErrFn<F>>: FusedFuture, 

fn is_terminated(&self) -> bool

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

impl<Fut, F> Future for MapErr<Fut, F> where
    Map<IntoFuture<Fut>, MapErrFn<F>>: Future, 

type Output = <Map<IntoFuture<Fut>, MapErrFn<F>> as Future>::Output

The type of value produced on completion.

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

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

impl<Fut, F> PinnedDrop for MapErr<Fut, F>

unsafe fn drop(self: Pin<&mut Self>)

impl<'pin, Fut, F> Unpin for MapErr<Fut, F> where
    __MapErr<'pin, Fut, F>: Unpin, 

impl<Fut, F> UnsafeUnpin for MapErr<Fut, F>