pending.rs - source

Files

addr2line

adler

aho_corasick

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bitflags

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fmt

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future

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stream

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getrandom

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hid_io_core

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capnp.rs mod.rs

device

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module

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daemonnode.rs mod.rs

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commands

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install_service

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inline_lazy.rs lib.rs

libc

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align.rs mod.rs

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fixed_width_ints.rs lib.rs macros.rs

libloading

os

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changelog.rs error.rs lib.rs util.rs

libudev_sys

log

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memchr

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fallback.rs iter.rs lib.rs naive.rs

memmap

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inflate

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lib.rs shared.rs

mio

event

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net

tcp

listener.rs mod.rs socket.rs stream.rs

uds

datagram.rs listener.rs mod.rs stream.rs

sys

unix

selector

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uds

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nix

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object

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open

pem

errors.rs lib.rs

pin_project_lite

pin_utils

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ppv_lite86

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lib.rs soft.rs types.rs

proc_macro2

detection.rs fallback.rs lib.rs marker.rs parse.rs wrapper.rs

proc_macro_hack

error.rs iter.rs lib.rs parse.rs quote.rs

proc_macro_nested

quote

ext.rs format.rs ident_fragment.rs lib.rs runtime.rs spanned.rs to_tokens.rs

rand

rand_chacha

chacha.rs guts.rs lib.rs

rand_core

block.rs error.rs impls.rs le.rs lib.rs os.rs

rcgen

regex

regex_syntax

remove_dir_all

ring

rustc_demangle

legacy.rs lib.rs v0.rs

rustls

scoped_tls

sct

serde

de

ignored_any.rs impls.rs mod.rs seed.rs utf8.rs value.rs

private

de.rs doc.rs mod.rs ser.rs size_hint.rs

ser

fmt.rs impls.rs impossible.rs mod.rs

integer128.rs lib.rs macros.rs

serde_derive

internals

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bound.rs de.rs dummy.rs fragment.rs lib.rs pretend.rs ser.rs try.rs

slab

smallvec

spin

lib.rs mutex.rs once.rs rw_lock.rs

stable_deref_trait

strsim

syn

synstructure

lib.rs macros.rs

sys_info

tempfile

file

imp

dir.rs error.rs lib.rs spooled.rs util.rs

textwrap

indentation.rs lib.rs splitting.rs

thiserror

aserror.rs display.rs lib.rs

thiserror_impl

ast.rs attr.rs expand.rs fmt.rs lib.rs prop.rs valid.rs

time

display.rs duration.rs lib.rs parse.rs sys.rs

tokio

future

block_on.rs maybe_done.rs mod.rs poll_fn.rs ready.rs

io

driver

interest.rs mod.rs ready.rs registration.rs scheduled_io.rs

async_buf_read.rs async_fd.rs async_read.rs async_seek.rs async_write.rs mod.rs poll_evented.rs read_buf.rs

loom

std

atomic_ptr.rs atomic_u16.rs atomic_u32.rs atomic_u64.rs atomic_u8.rs atomic_usize.rs mod.rs mutex.rs unsafe_cell.rs

macros

cfg.rs join.rs loom.rs mod.rs pin.rs ready.rs scoped_tls.rs select.rs support.rs thread_local.rs try_join.rs

net

park

either.rs mod.rs thread.rs

runtime

stream

sync

mpsc

block.rs bounded.rs chan.rs error.rs list.rs mod.rs unbounded.rs

task

atomic_waker.rs mod.rs

barrier.rs batch_semaphore.rs broadcast.rs mod.rs mutex.rs notify.rs oneshot.rs rwlock.rs semaphore.rs watch.rs

task

blocking.rs local.rs mod.rs spawn.rs task_local.rs yield_now.rs

time

driver

wheel

level.rs mod.rs

entry.rs handle.rs mod.rs sleep.rs

clock.rs error.rs instant.rs interval.rs mod.rs timeout.rs

util

bit.rs linked_list.rs mod.rs rand.rs slab.rs trace.rs try_lock.rs wake.rs

blocking.rs coop.rs lib.rs prelude.rs

tokio_macros

entry.rs lib.rs select.rs

tokio_rustls

common

handshake.rs mod.rs

client.rs lib.rs server.rs

tokio_util

sync

cancellation_token.rs intrusive_double_linked_list.rs mod.rs

cfg.rs compat.rs either.rs lib.rs loom.rs

typenum

array.rs bit.rs int.rs lib.rs marker_traits.rs operator_aliases.rs private.rs type_operators.rs uint.rs

udev

device.rs enumerator.rs lib.rs monitor.rs udev.rs util.rs

uhid_virt

codec.rs lib.rs uhid_device.rs

uhidrs_sys

unicode_width

lib.rs tables.rs

unicode_xid

lib.rs tables.rs

untrusted

vec_map

wayland_client

native_lib

display.rs event_queue.rs mod.rs proxy.rs

display.rs event_queue.rs globals.rs lib.rs proxy.rs

wayland_commons

debug.rs filter.rs lib.rs map.rs socket.rs user_data.rs wire.rs

wayland_sys

client.rs common.rs lib.rs server.rs

webpki

calendar.rs cert.rs der.rs error.rs name.rs signed_data.rs time.rs trust_anchor_util.rs verify_cert.rs webpki.rs

which

checker.rs error.rs finder.rs lib.rs

x11

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xcb

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base.rs big_requests.rs lib.rs xc_misc.rs xkb.rs xproto.rs

xkbcommon

xkb

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compose.rs ffi.rs keysyms.rs mod.rs

yansi

color.rs docify.rs lib.rs macros.rs paint.rs style.rs windows.rs

yasna

deserializer

models

der.rs mod.rs oid.rs time.rs

reader

error.rs mod.rs

serializer

tags

writer

zwp_virtual_keyboard

use crate::stream::Stream;

use core::marker::PhantomData;
use core::pin::Pin;
use core::task::{Context, Poll};

/// Stream for the [`pending`](fn@pending) function.
#[derive(Debug)]
#[must_use = "streams do nothing unless polled"]
pub struct Pending<T>(PhantomData<T>);

impl<T> Unpin for Pending<T> {}
unsafe impl<T> Send for Pending<T> {}
unsafe impl<T> Sync for Pending<T> {}

/// Creates a stream that is never ready
///
/// The returned stream is never ready. Attempting to call
/// [`next()`](crate::stream::StreamExt::next) will never complete. Use
/// [`stream::empty()`](super::empty()) to obtain a stream that is is
/// immediately empty but returns no values.
///
/// # Examples
///
/// Basic usage:
///
/// ```no_run
/// use tokio::stream::{self, StreamExt};
///
/// #[tokio::main]
/// async fn main() {
///     let mut never = stream::pending::<i32>();
///
///     // This will never complete
///     never.next().await;
///
///     unreachable!();
/// }
/// ```
pub const fn pending<T>() -> Pending<T> {
    Pending(PhantomData)
}

impl<T> Stream for Pending<T> {
    type Item = T;

    fn poll_next(self: Pin<&mut Self>, _: &mut Context<'_>) -> Poll<Option<T>> {
        Poll::Pending
    }

    fn size_hint(&self) -> (usize, Option<usize>) {
        (0, None)
    }
}