      1
      2
      3
      4
      5
      6
      7
      8
      9
     10
     11
     12
     13
     14
     15
     16
     17
     18
     19
     20
     21
     22
     23
     24
     25
     26
     27
     28
     29
     30
     31
     32
     33
     34
     35
     36
     37
     38
     39
     40
     41
     42
     43
     44
     45
     46
     47
     48
     49
     50
     51
     52
     53
     54
     55
     56
     57
     58
     59
     60
     61
     62
     63
     64
     65
     66
     67
     68
     69
     70
     71
     72
     73
     74
     75
     76
     77
     78
     79
     80
     81
     82
     83
     84
     85
     86
     87
     88
     89
     90
     91
     92
     93
     94
     95
     96
     97
     98
     99
    100
    101
    102
    103
    104
    105

    use std::any::Any;
    use std::error::Error;
    use std::fmt;

    use {StartSend, Sink, Stream, Poll, Async, AsyncSink};
    use sync::BiLock;

    /// A `Stream` part of the split pair
    #[derive(Debug)]
    pub struct SplitStream<S>(BiLock<S>);

    impl<S> SplitStream<S> {
        /// Attempts to put the two "halves" of a split `Stream + Sink` back
        /// together. Succeeds only if the `SplitStream<S>` and `SplitSink<S>` are
        /// a matching pair originating from the same call to `Stream::split`.
        pub fn reunite(self, other: SplitSink<S>) -> Result<S, ReuniteError<S>> {
            other.reunite(self)
        }
    }

    impl<S: Stream> Stream for SplitStream<S> {
        type Item = S::Item;
        type Error = S::Error;

        fn poll(&mut self) -> Poll<Option<S::Item>, S::Error> {
            match self.0.poll_lock() {
                Async::Ready(mut inner) => inner.poll(),
                Async::NotReady => Ok(Async::NotReady),
            }
        }
    }

    /// A `Sink` part of the split pair
    #[derive(Debug)]
    pub struct SplitSink<S>(BiLock<S>);

    impl<S> SplitSink<S> {
        /// Attempts to put the two "halves" of a split `Stream + Sink` back
        /// together. Succeeds only if the `SplitStream<S>` and `SplitSink<S>` are
        /// a matching pair originating from the same call to `Stream::split`.
        pub fn reunite(self, other: SplitStream<S>) -> Result<S, ReuniteError<S>> {
            self.0.reunite(other.0).map_err(|err| {
                ReuniteError(SplitSink(err.0), SplitStream(err.1))
            })
        }
    }

    impl<S: Sink> Sink for SplitSink<S> {
        type SinkItem = S::SinkItem;
        type SinkError = S::SinkError;

        fn start_send(&mut self, item: S::SinkItem)
            -> StartSend<S::SinkItem, S::SinkError>
        {
            match self.0.poll_lock() {
                Async::Ready(mut inner) => inner.start_send(item),
                Async::NotReady => Ok(AsyncSink::NotReady(item)),
            }
        }

        fn poll_complete(&mut self) -> Poll<(), S::SinkError> {
            match self.0.poll_lock() {
                Async::Ready(mut inner) => inner.poll_complete(),
                Async::NotReady => Ok(Async::NotReady),
            }
        }

        fn close(&mut self) -> Poll<(), S::SinkError> {
            match self.0.poll_lock() {
                Async::Ready(mut inner) => inner.close(),
                Async::NotReady => Ok(Async::NotReady),
            }
        }
    }

    pub fn split<S: Stream + Sink>(s: S) -> (SplitSink<S>, SplitStream<S>) {
        let (a, b) = BiLock::new(s);
        let read = SplitStream(a);
        let write = SplitSink(b);
        (write, read)
    }

    /// Error indicating a `SplitSink<S>` and `SplitStream<S>` were not two halves
    /// of a `Stream + Split`, and thus could not be `reunite`d.
    pub struct ReuniteError<T>(pub SplitSink<T>, pub SplitStream<T>);

    impl<T> fmt::Debug for ReuniteError<T> {
        fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
            fmt.debug_tuple("ReuniteError")
                .field(&"...")
                .finish()
        }
    }

    impl<T> fmt::Display for ReuniteError<T> {
        fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
            write!(fmt, "tried to reunite a SplitStream and SplitSink that don't form a pair")
        }
    }

    impl<T: Any> Error for ReuniteError<T> {
        fn description(&self) -> &str {
            "tried to reunite a SplitStream and SplitSink that don't form a pair"
        }
    }

# Help

## Keyboard Shortcuts

`?`
  Show this help dialog
`S`
  Focus the search field
`↑`
  Move up in search results
`↓`
  Move down in search results
`↹`
  Switch tab
`⏎`
  Go to active search result
`+`
  Expand all sections
`-`
  Collapse all sections

## Search Tricks

Prefix searches with a type followed by a colon (e.g. `fn:`) to restrict the search to a given type.

Accepted types are: `fn`, `mod`, `struct`, `enum`, `trait`, `type`, `macro`, and `const`.

Search functions by type signature (e.g. `vec -> usize` or `* -> vec`)