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//! Combinators and utilities for working with `Future`s, `Stream`s, `Sink`s,
//! and the `AsyncRead` and `AsyncWrite` traits.

#![feature(futures_api)]
#![cfg_attr(feature = "std", feature(async_await, await_macro, box_into_pin))]
#![cfg_attr(feature = "cfg-target-has-atomic", feature(cfg_target_has_atomic))]

#![cfg_attr(not(feature = "std"), no_std)]
#![warn(missing_docs, missing_debug_implementations, rust_2018_idioms)]

#![doc(html_root_url = "https://rust-lang-nursery.github.io/futures-api-docs/0.3.0-alpha.13/futures_util")]

#[cfg(all(feature = "cfg-target-has-atomic", not(feature = "nightly")))]
compile_error!("The `cfg-target-has-atomic` feature requires the `nightly` feature as an explicit opt-in to unstable features");

#[macro_use]
mod macros;

#[cfg(feature = "std")]
#[macro_use]
#[doc(hidden)]
pub mod async_await;
#[cfg(feature = "std")]
pub use self::async_await::*;

#[cfg(feature = "std")]
#[doc(hidden)]
pub mod rand_reexport { // used by select!
    pub use rand::*;
}

#[doc(hidden)]
pub mod core_reexport {
    pub use core::*;
}

macro_rules! delegate_sink {
    ($field:ident) => {
        fn poll_ready(
            self: Pin<&mut Self>,
            waker: &$crate::core_reexport::task::Waker,
        ) -> $crate::core_reexport::task::Poll<Result<(), Self::SinkError>> {
            self.$field().poll_ready(waker)
        }

        fn start_send(
            self: Pin<&mut Self>,
            item: Self::SinkItem
        ) -> Result<(), Self::SinkError> {
            self.$field().start_send(item)
        }

        fn poll_flush(
            self: Pin<&mut Self>,
            waker: &$crate::core_reexport::task::Waker
        ) -> $crate::core_reexport::task::Poll<Result<(), Self::SinkError>> {
            self.$field().poll_flush(waker)
        }

        fn poll_close(
            self: Pin<&mut Self>,
            waker: &$crate::core_reexport::task::Waker
        ) -> $crate::core_reexport::task::Poll<Result<(), Self::SinkError>> {
            self.$field().poll_close(waker)
        }
    }
}

pub mod future;
#[doc(hidden)] pub use crate::future::FutureExt;

pub mod try_future;
#[doc(hidden)] pub use crate::try_future::TryFutureExt;

pub mod stream;
#[doc(hidden)] pub use crate::stream::StreamExt;

pub mod try_stream;
#[doc(hidden)] pub use crate::try_stream::TryStreamExt;

pub mod sink;
#[doc(hidden)] pub use crate::sink::SinkExt;

pub mod task;

#[cfg(feature = "compat")]
pub mod compat;

#[cfg(feature = "std")]
pub mod io;
#[cfg(feature = "std")]
#[doc(hidden)] pub use crate::io::{AsyncReadExt, AsyncWriteExt};

#[cfg(feature = "std")]
pub mod lock;