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SinkPrepareSendFuture

tor_async_utils

Struct SinkPrepareSendFuture 

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pub struct SinkPrepareSendFuture<'w, IF, OS, OM> {
    generator: IF,
    output: Option<Pin<&'w mut OS>>,
    tw: PhantomData<fn(OM)>,
}
Expand description

Future for SinkPrepareExt::prepare_send_from

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§generator: IF

Underlying future that will yield a message.

§output: Option<Pin<&'w mut OS>>

This Option exists because otherwise SinkPrepareSendFuture::poll() can’t move output out of this struct to put it into the SinkSendable. (The poll() impl cannot borrow from SinkPrepareSendFuture.)

§tw: PhantomData<fn(OM)>

fn(OM) gives contravariance in OM.

Variance is confusing. Loosely, a SinkPrepareSendFuture<..OM> consumes an OM. Actually, we don’t really need to add any variance restricions wrt OM, because the &mut OS already implies the correct variance, so we could have used the PhantomData<fn(*const OM)> trick. Happily there is no unsafe anywhere nearby, so it is not possible for us to write a bug due to getting the variance wrong - only to erroneously prevent some use case.

Implementations§

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impl<'w, IF, OS, OM> SinkPrepareSendFuture<'w, IF, OS, OM>

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pub(crate) fn project<'pin>( self: Pin<&'pin mut Self>, ) -> __SinkPrepareSendFutureProjection<'pin, 'w, IF, OS, OM>

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pub(crate) fn project_ref<'pin>( self: Pin<&'pin Self>, ) -> __SinkPrepareSendFutureProjectionRef<'pin, 'w, IF, OS, OM>

Trait Implementations§

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impl<'w, IF, OS, IM, OM> FusedFuture for SinkPrepareSendFuture<'w, IF, OS, OM>
where IF: Future<Output = IM>, OS: Sink<OM>,

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fn is_terminated(&self) -> bool

Returns true if the underlying future should no longer be polled.
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impl<'w, IF, OS, IM, OM> Future for SinkPrepareSendFuture<'w, IF, OS, OM>
where IF: Future<Output = IM>, OS: Sink<OM>,

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type Output = Result<(IM, SinkSendable<'w, OS, OM>), <OS as Sink<OM>>::Error>

The type of value produced on completion.
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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. Read more
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impl<'pin, 'w, IF, OS, OM> Unpin for SinkPrepareSendFuture<'w, IF, OS, OM>
where PinnedFieldsOf<__SinkPrepareSendFuture<'pin, 'w, IF, OS, OM>>: Unpin,

Auto Trait Implementations§

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impl<'w, IF, OS, OM> !UnwindSafe for SinkPrepareSendFuture<'w, IF, OS, OM>

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impl<'w, IF, OS, OM> Freeze for SinkPrepareSendFuture<'w, IF, OS, OM>
where IF: Freeze,

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impl<'w, IF, OS, OM> RefUnwindSafe for SinkPrepareSendFuture<'w, IF, OS, OM>
where IF: RefUnwindSafe, OS: RefUnwindSafe,

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impl<'w, IF, OS, OM> Send for SinkPrepareSendFuture<'w, IF, OS, OM>
where IF: Send, OS: Send,

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impl<'w, IF, OS, OM> Sync for SinkPrepareSendFuture<'w, IF, OS, OM>
where IF: Sync, OS: Sync,

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impl<'w, IF, OS, OM> UnsafeUnpin for SinkPrepareSendFuture<'w, IF, OS, OM>
where IF: UnsafeUnpin,

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