seek.rs.html -- source

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aho_corasick

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teddy

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bitflags

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eui48

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zlib

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fnv

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stream

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h2

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http

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client

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io

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proto

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accept.rs conn.rs mod.rs shutdown.rs tcp.rs

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hyper_tls

client.rs lib.rs stream.rs

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indexmap

map

core

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iovec

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itoa

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inline_lazy.rs lib.rs

libc

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matches

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mime

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miniz_oxide

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mio

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openssl

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osproto

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percent_encoding

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proc_macro2

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proc_macro_hack

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proc_macro_nested

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regex

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body.rs client.rs decoder.rs mod.rs multipart.rs request.rs response.rs

connect.rs error.rs into_url.rs lib.rs proxy.rs redirect.rs tls.rs util.rs

rustc_serialize

base64.rs collection_impls.rs hex.rs json.rs lib.rs serialize.rs

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

from_primitive.rs ignored_any.rs impls.rs mod.rs utf8.rs value.rs

private

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ser

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export.rs integer128.rs lib.rs macros.rs

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ast.rs attr.rs case.rs check.rs ctxt.rs mod.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

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

serde_urlencoded

ser

key.rs mod.rs pair.rs part.rs value.rs

serde_yaml

value

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

de.rs error.rs lib.rs mapping.rs number.rs path.rs ser.rs

slab

socket2

sys

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

syn

thread_local

cached.rs lib.rs thread_id.rs unreachable.rs

time

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

tinyvec

array.rs arrayvec.rs lib.rs tinyvec.rs

tokio

future

maybe_done.rs mod.rs poll_fn.rs ready.rs try_join.rs

io

loom

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

incoming.rs listener.rs mod.rs split.rs split_owned.rs stream.rs

park

either.rs mod.rs thread.rs

runtime

stream

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sync

task

blocking.rs mod.rs spawn.rs yield_now.rs

time

driver

atomic_stack.rs entry.rs handle.rs mod.rs registration.rs stack.rs

wheel

level.rs mod.rs stack.rs

clock.rs delay.rs delay_queue.rs error.rs instant.rs interval.rs mod.rs throttle.rs timeout.rs

util

slab

addr.rs entry.rs generation.rs mod.rs page.rs shard.rs slot.rs stack.rs

bit.rs intrusive_double_linked_list.rs linked_list.rs mod.rs rand.rs trace.rs wake.rs

coop.rs lib.rs prelude.rs

tokio_macros

entry.rs lib.rs select.rs

tokio_tls

tokio_util

codec

bytes_codec.rs decoder.rs encoder.rs framed.rs framed_read.rs framed_write.rs length_delimited.rs lines_codec.rs mod.rs

tower_service

tracing

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

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_bidi

char_data

mod.rs tables.rs

deprecated.rs explicit.rs format_chars.rs implicit.rs level.rs lib.rs prepare.rs

unicode_normalization

__test_api.rs decompose.rs lib.rs lookups.rs no_std_prelude.rs normalize.rs perfect_hash.rs quick_check.rs recompose.rs stream_safe.rs tables.rs

unicode_xid

lib.rs tables.rs

url

host.rs lib.rs origin.rs parser.rs path_segments.rs quirks.rs slicing.rs

waiter

want

yaml_rust

emitter.rs lib.rs parser.rs scanner.rs yaml.rs

use crate::io::AsyncSeek;
use std::future::Future;
use std::io::{self, SeekFrom};
use std::pin::Pin;
use std::task::{Context, Poll};

/// Future for the [`seek`](crate::io::AsyncSeekExt::seek) method.
#[derive(Debug)]
#[must_use = "futures do nothing unless you `.await` or poll them"]
pub struct Seek<'a, S: ?Sized> {
    seek: &'a mut S,
    pos: Option<SeekFrom>,
}

pub(crate) fn seek<S>(seek: &mut S, pos: SeekFrom) -> Seek<'_, S>
where
    S: AsyncSeek + ?Sized + Unpin,
{
    Seek {
        seek,
        pos: Some(pos),
    }
}

impl<S> Future for Seek<'_, S>
where
    S: AsyncSeek + ?Sized + Unpin,
{
    type Output = io::Result<u64>;

    fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
        let me = &mut *self;
        match me.pos {
            Some(pos) => match Pin::new(&mut me.seek).start_seek(cx, pos) {
                Poll::Ready(Ok(())) => {
                    me.pos = None;
                    Pin::new(&mut me.seek).poll_complete(cx)
                }
                Poll::Ready(Err(e)) => Poll::Ready(Err(e)),
                Poll::Pending => Poll::Pending,
            },
            None => Pin::new(&mut me.seek).poll_complete(cx),
        }
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn assert_unpin() {
        use std::marker::PhantomPinned;
        crate::is_unpin::<Seek<'_, PhantomPinned>>();
    }
}

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