Trait futures::prelude::TryStream

pub trait TryStream {
    type Ok;
    type Error;
    fn try_poll_next(
        self: Pin<&mut Self>, 
        lw: &LocalWaker
    ) -> Poll<Option<Result<Self::Ok, Self::Error>>>;
}

A convenience for streams that return Result values that includes a variety of adapters tailored to such futures.

Associated Types

type Ok

The type of successful values yielded by this future

type Error

The type of failures yielded by this future

Required Methods

fn try_poll_next(
    self: Pin<&mut Self>,
    lw: &LocalWaker
) -> Poll<Option<Result<Self::Ok, Self::Error>>>

Poll this TryStream as if it were a Stream.

This method is a stopgap for a compiler limitation that prevents us from directly inheriting from the Stream trait; in the future it won't be needed.

Implementors

impl<S, T, E> TryStream for S where     S: Stream<Item = Result<T, E>>,

type Ok = T

type Error = E

fn try_poll_next(     self: Pin<&mut S>,     lw: &LocalWaker ) -> Poll<Option<Result<<S as TryStream>::Ok, <S as TryStream>::Error>>>