poll_fn.rs - source

Files

bitflags

bytes

buf

buf_impl.rs buf_mut.rs chain.rs iter.rs limit.rs mod.rs reader.rs take.rs uninit_slice.rs vec_deque.rs writer.rs

fmt

debug.rs hex.rs mod.rs

bytes.rs bytes_mut.rs lib.rs loom.rs

cfg_if

fnv

foreign_types

foreign_types_shared

futures

futures_channel

mpsc

mod.rs queue.rs sink_impl.rs

lib.rs lock.rs oneshot.rs

futures_core

task

__internal

atomic_waker.rs mod.rs

future.rs lib.rs stream.rs

futures_executor

enter.rs lib.rs local_pool.rs

futures_io

futures_macro

join.rs lib.rs select.rs

futures_sink

futures_task

arc_wake.rs future_obj.rs lib.rs noop_waker.rs spawn.rs waker.rs waker_ref.rs

futures_util

async_await

join_mod.rs mod.rs pending.rs poll.rs random.rs select_mod.rs

future

io

lock

bilock.rs mod.rs mutex.rs

sink

buffer.rs close.rs drain.rs err_into.rs fanout.rs feed.rs flush.rs map_err.rs mod.rs send.rs send_all.rs unfold.rs with.rs with_flat_map.rs

stream

task

mod.rs spawn.rs

fns.rs lib.rs never.rs unfold_state.rs

getrandom

error.rs error_impls.rs lib.rs linux_android.rs use_file.rs util.rs util_libc.rs

http

header

map.rs mod.rs name.rs value.rs

uri

authority.rs builder.rs mod.rs path.rs port.rs scheme.rs

byte_str.rs convert.rs error.rs extensions.rs lib.rs method.rs request.rs response.rs status.rs version.rs

http_body

combinators

box_body.rs map_data.rs map_err.rs mod.rs

empty.rs lib.rs next.rs size_hint.rs

httparse

simd

avx2.rs mod.rs sse42.rs

iter.rs lib.rs macros.rs

httpdate

httpdate.rs lib.rs

hyper

body

aggregate.rs body.rs length.rs mod.rs to_bytes.rs

client

connect

dns.rs http.rs mod.rs

client.rs conn.rs dispatch.rs mod.rs pool.rs service.rs

common

io

mod.rs rewind.rs

buf.rs exec.rs lazy.rs mod.rs never.rs task.rs watch.rs

proto

h1

conn.rs decode.rs dispatch.rs encode.rs io.rs mod.rs role.rs

service

http.rs make.rs mod.rs oneshot.rs util.rs

cfg.rs error.rs headers.rs lib.rs rt.rs upgrade.rs

hyper_tls

client.rs lib.rs stream.rs

itoa

lazy_static

inline_lazy.rs lib.rs

libc

unix

linux_like

linux

gnu

b64

x86_64

align.rs mod.rs not_x32.rs

align.rs mod.rs

align.rs mod.rs

align.rs mod.rs

fixed_width_ints.rs lib.rs macros.rs

log

lib.rs macros.rs

memchr

x86

avx.rs mod.rs sse2.rs

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

mime

lib.rs parse.rs

mime_guess

impl_bin_search.rs lib.rs

mio

event

event.rs events.rs mod.rs source.rs

net

tcp

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

uds

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

sys

unix

selector

epoll.rs mod.rs

uds

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

mod.rs net.rs pipe.rs sourcefd.rs tcp.rs udp.rs waker.rs

interest.rs io_source.rs lib.rs macros.rs poll.rs token.rs waker.rs

multipart

client

lazy.rs mod.rs sized.rs

native_tls

imp

num_cpus

lib.rs linux.rs

num_traits

ops

checked.rs inv.rs mod.rs mul_add.rs overflowing.rs saturating.rs wrapping.rs

bounds.rs cast.rs float.rs identities.rs int.rs lib.rs macros.rs pow.rs real.rs sign.rs

once_cell

imp_std.rs lib.rs race.rs

openssl

openssl_probe

openssl_sys

ordered_float

pin_project

pin_project_internal

pin_project

args.rs attribute.rs derive.rs mod.rs

lib.rs pinned_drop.rs utils.rs

pin_project_lite

pin_utils

lib.rs projection.rs stack_pin.rs

ppv_lite86

x86_64

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

remove_dir_all

ryu

buffer

pretty

exponent.rs mantissa.rs mod.rs

common.rs d2s.rs d2s_full_table.rs d2s_intrinsics.rs digit_table.rs f2s.rs f2s_intrinsics.rs lib.rs

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

ast.rs attr.rs case.rs check.rs ctxt.rs mod.rs receiver.rs respan.rs symbol.rs

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

serde_json

features_check

io

value

de.rs from.rs index.rs mod.rs partial_eq.rs ser.rs

de.rs error.rs iter.rs lib.rs macros.rs map.rs number.rs read.rs ser.rs

serde_value

de.rs lib.rs ser.rs

slab

socket2

sys

lib.rs sockaddr.rs socket.rs utils.rs

syn

telegram_bot

connector

hyper.rs mod.rs

types

mod.rs requests.rs

util

messages.rs mod.rs

api.rs errors.rs lib.rs macros.rs prelude.rs stream.rs

telegram_bot_raw

requests

types

callback_query.rs chat.rs chat_member.rs inline_query.rs inline_query_result.rs input_file.rs message.rs mod.rs primitive.rs refs.rs reply_markup.rs response_parameters.rs text.rs update.rs

tempfile

file

imp

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

tokio

fs

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 blocking.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

tcp

listener.rs mod.rs socket.rs split.rs split_owned.rs stream.rs

unix

datagram

mod.rs socket.rs

listener.rs mod.rs socketaddr.rs split.rs split_owned.rs stream.rs ucred.rs

addr.rs lookup_host.rs mod.rs udp.rs

park

either.rs mod.rs thread.rs

runtime

sync

task

blocking.rs local.rs mod.rs spawn.rs task_local.rs unconstrained.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 error.rs linked_list.rs mod.rs rand.rs slab.rs trace.rs try_lock.rs wake.rs

blocking.rs coop.rs lib.rs

tokio_macros

entry.rs lib.rs select.rs

tokio_native_tls

tower_service

tracing

dispatcher.rs field.rs instrument.rs level_filters.rs lib.rs macros.rs span.rs stdlib.rs subscriber.rs

tracing_attributes

tracing_core

callsite.rs dispatcher.rs event.rs field.rs lib.rs metadata.rs parent.rs span.rs stdlib.rs subscriber.rs

tracing_futures

executor

lib.rs stdlib.rs

try_lock

unicase

unicode

ascii.rs lib.rs

unicode_xid

lib.rs tables.rs

want

//! Definition of the `PollFn` adapter combinator

use super::assert_future;
use core::fmt;
use core::pin::Pin;
use futures_core::future::Future;
use futures_core::task::{Context, Poll};

/// Future for the [`poll_fn`] function.
#[must_use = "futures do nothing unless you `.await` or poll them"]
pub struct PollFn<F> {
    f: F,
}

impl<F> Unpin for PollFn<F> {}

/// Creates a new future wrapping around a function returning [`Poll`].
///
/// Polling the returned future delegates to the wrapped function.
///
/// # Examples
///
/// ```
/// # futures::executor::block_on(async {
/// use futures::future::poll_fn;
/// use futures::task::{Context, Poll};
///
/// fn read_line(_cx: &mut Context<'_>) -> Poll<String> {
///     Poll::Ready("Hello, World!".into())
/// }
///
/// let read_future = poll_fn(read_line);
/// assert_eq!(read_future.await, "Hello, World!".to_owned());
/// # });
/// ```
pub fn poll_fn<T, F>(f: F) -> PollFn<F>
where
    F: FnMut(&mut Context<'_>) -> Poll<T>
{
    assert_future::<T, _>(PollFn { f })
}

impl<F> fmt::Debug for PollFn<F> {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        f.debug_struct("PollFn").finish()
    }
}

impl<T, F> Future for PollFn<F>
    where F: FnMut(&mut Context<'_>) -> Poll<T>,
{
    type Output = T;

    fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<T> {
        (&mut self.f)(cx)
    }
}