filter.rs.html -- source

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regex

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rustc_serialize

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ryu

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ser

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serde_urlencoded

ser

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

serde_yaml

value

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slab

socket2

sys

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syn

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time

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

tinyvec

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tokio

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

io

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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

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sync

task

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

time

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wheel

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

util

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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

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tower_service

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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::stream::Stream;

use core::fmt;
use core::pin::Pin;
use core::task::{Context, Poll};
use pin_project_lite::pin_project;

pin_project! {
    /// Stream returned by the [`filter`](super::StreamExt::filter) method.
    #[must_use = "streams do nothing unless polled"]
    pub struct Filter<St, F> {
        #[pin]
        stream: St,
        f: F,
    }
}

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

impl<St, F> Filter<St, F> {
    pub(super) fn new(stream: St, f: F) -> Self {
        Self { stream, f }
    }
}

impl<St, F> Stream for Filter<St, F>
where
    St: Stream,
    F: FnMut(&St::Item) -> bool,
{
    type Item = St::Item;

    fn poll_next(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<St::Item>> {
        loop {
            match ready!(self.as_mut().project().stream.poll_next(cx)) {
                Some(e) => {
                    if (self.as_mut().project().f)(&e) {
                        return Poll::Ready(Some(e));
                    }
                }
                None => return Poll::Ready(None),
            }
        }
    }

    fn size_hint(&self) -> (usize, Option<usize>) {
        (0, self.stream.size_hint().1) // can't know a lower bound, due to the predicate
    }
}

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