Struct AsyncTry 

pub struct AsyncTry<'a, G: AsyncTryGetFut<'a>> { /* private fields */ }

Try to encapsulate an async-constructed borrowed-future along with it’s owner.

This struct only works with !Send futures. If you’re working with Send-futures, try using AsyncSendTry.

This struct can be constructed by passing to Self::new the owner by value and a functor-like AsyncTryGetFut, which when invoked will return a borrowed-future.’

In contrast to the method helpers in this crate, this structure is a future which must be polled in order to acquire the owned-future. Polling this future will first poll the functor until it results in either an error, in which case this future will yield that same error along with the owner, or a borrowed-future, in which ase this future will yield a future which has taken ownership of the owner, and will .await the borrowed future when polled. Auxiliary data returned by the functor is also yielded in this case.

Callers may wish to use crate::async_try_get to quickly construct the functor for cases which don’t require capturing, but any type which implements AsyncTryGetFut will work.

Implementations

impl<'a, G: AsyncTryGetFut<'a>> AsyncTry<'a, G>

pub fn new(val: G::Input, getter: G) -> Self

Construct the AsyncTry from an owner and a borrowed-future functor

Trait Implementations

impl<'a, G: AsyncTryGetFut<'a>> Future for AsyncTry<'a, G>

type Output = Result<(Pin<Box<dyn Future<Output = <G as AsyncTryGetFut<'a>>::Output> + 'a>>, <G as AsyncTryGetFut<'a>>::Aux), (<G as AsyncTryGetFut<'a>>::Input, <G as AsyncTryGetFut<'a>>::Error)>

The type of value produced on completion.

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

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

impl<'__pin, 'a, G: AsyncTryGetFut<'a>> Unpin for AsyncTry<'a, G>

where PinnedFieldsOf<__Origin<'__pin, 'a, G>>: Unpin,