<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source to the Rust file `/home/mrh/.cargo/registry/src/github.com-1ecc6299db9ec823/crossbeam-channel-0.3.8/src/channel.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>channel.rs.html -- source</title><link rel="stylesheet" type="text/css" href="../../normalize.css"><link rel="stylesheet" type="text/css" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../dark.css"><link rel="stylesheet" type="text/css" href="../../light.css" id="themeStyle"><script src="../../storage.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="shortcut icon" href="../../favicon.ico"><style type="text/css">#crate-search{background-image:url("../../down-arrow.svg");}</style></head><body class="rustdoc source"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu">☰</div><a href='../../crossbeam_channel/index.html'><div class='logo-container'><img src='../../rust-logo.png' alt='logo'></div></a></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!"><img src="../../brush.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices"></div></div><script src="../../theme.js"></script><nav class="sub"><form class="search-form js-only"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><a id="settings-menu" href="../../settings.html"><img src="../../wheel.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><pre class="line-numbers"><span id="1"> 1</span>
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</pre><div class="example-wrap"><pre class="rust ">
<span class="doccomment">//! The channel interface.</span>
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">fmt</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">iter</span>::<span class="ident">FusedIterator</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">mem</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">panic</span>::{<span class="ident">RefUnwindSafe</span>, <span class="ident">UnwindSafe</span>};
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">sync</span>::<span class="ident">Arc</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">time</span>::{<span class="ident">Duration</span>, <span class="ident">Instant</span>};
<span class="kw">use</span> <span class="ident">context</span>::<span class="ident">Context</span>;
<span class="kw">use</span> <span class="ident">counter</span>;
<span class="kw">use</span> <span class="ident">err</span>::{<span class="ident">RecvError</span>, <span class="ident">RecvTimeoutError</span>, <span class="ident">SendError</span>, <span class="ident">SendTimeoutError</span>, <span class="ident">TryRecvError</span>, <span class="ident">TrySendError</span>};
<span class="kw">use</span> <span class="ident">flavors</span>;
<span class="kw">use</span> <span class="ident">select</span>::{<span class="ident">Operation</span>, <span class="ident">SelectHandle</span>, <span class="ident">Token</span>};
<span class="doccomment">/// Creates a channel of unbounded capacity.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This channel has a growable buffer that can hold any number of messages at a time.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::thread;</span>
<span class="doccomment">/// use crossbeam_channel::unbounded;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let (s, r) = unbounded();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // Computes the n-th Fibonacci number.</span>
<span class="doccomment">/// fn fib(n: i32) -> i32 {</span>
<span class="doccomment">/// if n <= 1 {</span>
<span class="doccomment">/// n</span>
<span class="doccomment">/// } else {</span>
<span class="doccomment">/// fib(n - 1) + fib(n - 2)</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // Spawn an asynchronous computation.</span>
<span class="doccomment">/// thread::spawn(move || s.send(fib(20)).unwrap());</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // Print the result of the computation.</span>
<span class="doccomment">/// println!("{}", r.recv().unwrap());</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">unbounded</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>() <span class="op">-</span><span class="op">></span> (<span class="ident">Sender</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>, <span class="ident">Receiver</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>) {
<span class="kw">let</span> (<span class="ident">s</span>, <span class="ident">r</span>) <span class="op">=</span> <span class="ident">counter</span>::<span class="ident">new</span>(<span class="ident">flavors</span>::<span class="ident">list</span>::<span class="ident">Channel</span>::<span class="ident">new</span>());
<span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="ident">Sender</span> {
<span class="ident">flavor</span>: <span class="ident">SenderFlavor</span>::<span class="ident">List</span>(<span class="ident">s</span>),
};
<span class="kw">let</span> <span class="ident">r</span> <span class="op">=</span> <span class="ident">Receiver</span> {
<span class="ident">flavor</span>: <span class="ident">ReceiverFlavor</span>::<span class="ident">List</span>(<span class="ident">r</span>),
};
(<span class="ident">s</span>, <span class="ident">r</span>)
}
<span class="doccomment">/// Creates a channel of bounded capacity.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This channel has a buffer that can hold at most `cap` messages at a time.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// A special case is zero-capacity channel, which cannot hold any messages. Instead, send and</span>
<span class="doccomment">/// receive operations must appear at the same time in order to pair up and pass the message over.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Panics</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Panics if the capacity is greater than `usize::max_value() / 4`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// A channel of capacity 1:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::thread;</span>
<span class="doccomment">/// use std::time::Duration;</span>
<span class="doccomment">/// use crossbeam_channel::bounded;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let (s, r) = bounded(1);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // This call returns immediately because there is enough space in the channel.</span>
<span class="doccomment">/// s.send(1).unwrap();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// thread::spawn(move || {</span>
<span class="doccomment">/// // This call blocks the current thread because the channel is full.</span>
<span class="doccomment">/// // It will be able to complete only after the first message is received.</span>
<span class="doccomment">/// s.send(2).unwrap();</span>
<span class="doccomment">/// });</span>
<span class="doccomment">///</span>
<span class="doccomment">/// thread::sleep(Duration::from_secs(1));</span>
<span class="doccomment">/// assert_eq!(r.recv(), Ok(1));</span>
<span class="doccomment">/// assert_eq!(r.recv(), Ok(2));</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// A zero-capacity channel:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::thread;</span>
<span class="doccomment">/// use std::time::Duration;</span>
<span class="doccomment">/// use crossbeam_channel::bounded;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let (s, r) = bounded(0);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// thread::spawn(move || {</span>
<span class="doccomment">/// // This call blocks the current thread until a receive operation appears</span>
<span class="doccomment">/// // on the other side of the channel.</span>
<span class="doccomment">/// s.send(1).unwrap();</span>
<span class="doccomment">/// });</span>
<span class="doccomment">///</span>
<span class="doccomment">/// thread::sleep(Duration::from_secs(1));</span>
<span class="doccomment">/// assert_eq!(r.recv(), Ok(1));</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">bounded</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">cap</span>: <span class="ident">usize</span>) <span class="op">-</span><span class="op">></span> (<span class="ident">Sender</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>, <span class="ident">Receiver</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>) {
<span class="kw">if</span> <span class="ident">cap</span> <span class="op">=</span><span class="op">=</span> <span class="number">0</span> {
<span class="kw">let</span> (<span class="ident">s</span>, <span class="ident">r</span>) <span class="op">=</span> <span class="ident">counter</span>::<span class="ident">new</span>(<span class="ident">flavors</span>::<span class="ident">zero</span>::<span class="ident">Channel</span>::<span class="ident">new</span>());
<span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="ident">Sender</span> {
<span class="ident">flavor</span>: <span class="ident">SenderFlavor</span>::<span class="ident">Zero</span>(<span class="ident">s</span>),
};
<span class="kw">let</span> <span class="ident">r</span> <span class="op">=</span> <span class="ident">Receiver</span> {
<span class="ident">flavor</span>: <span class="ident">ReceiverFlavor</span>::<span class="ident">Zero</span>(<span class="ident">r</span>),
};
(<span class="ident">s</span>, <span class="ident">r</span>)
} <span class="kw">else</span> {
<span class="kw">let</span> (<span class="ident">s</span>, <span class="ident">r</span>) <span class="op">=</span> <span class="ident">counter</span>::<span class="ident">new</span>(<span class="ident">flavors</span>::<span class="ident">array</span>::<span class="ident">Channel</span>::<span class="ident">with_capacity</span>(<span class="ident">cap</span>));
<span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="ident">Sender</span> {
<span class="ident">flavor</span>: <span class="ident">SenderFlavor</span>::<span class="ident">Array</span>(<span class="ident">s</span>),
};
<span class="kw">let</span> <span class="ident">r</span> <span class="op">=</span> <span class="ident">Receiver</span> {
<span class="ident">flavor</span>: <span class="ident">ReceiverFlavor</span>::<span class="ident">Array</span>(<span class="ident">r</span>),
};
(<span class="ident">s</span>, <span class="ident">r</span>)
}
}
<span class="doccomment">/// Creates a receiver that delivers a message after a certain duration of time.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The channel is bounded with capacity of 1 and never gets disconnected. Exactly one message will</span>
<span class="doccomment">/// be sent into the channel after `duration` elapses. The message is the instant at which it is</span>
<span class="doccomment">/// sent.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Using an `after` channel for timeouts:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// # #[macro_use]</span>
<span class="doccomment">/// # extern crate crossbeam_channel;</span>
<span class="doccomment">/// # fn main() {</span>
<span class="doccomment">/// use std::time::Duration;</span>
<span class="doccomment">/// use crossbeam_channel::{after, unbounded};</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let (s, r) = unbounded::<i32>();</span>
<span class="doccomment">/// let timeout = Duration::from_millis(100);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// select! {</span>
<span class="doccomment">/// recv(r) -> msg => println!("received {:?}", msg),</span>
<span class="doccomment">/// recv(after(timeout)) -> _ => println!("timed out"),</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// # }</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// When the message gets sent:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::thread;</span>
<span class="doccomment">/// use std::time::{Duration, Instant};</span>
<span class="doccomment">/// use crossbeam_channel::after;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // Converts a number of milliseconds into a `Duration`.</span>
<span class="doccomment">/// let ms = |ms| Duration::from_millis(ms);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // Returns `true` if `a` and `b` are very close `Instant`s.</span>
<span class="doccomment">/// let eq = |a, b| a + ms(50) > b && b + ms(50) > a;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let start = Instant::now();</span>
<span class="doccomment">/// let r = after(ms(100));</span>
<span class="doccomment">///</span>
<span class="doccomment">/// thread::sleep(ms(500));</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // This message was sent 100 ms from the start and received 500 ms from the start.</span>
<span class="doccomment">/// assert!(eq(r.recv().unwrap(), start + ms(100)));</span>
<span class="doccomment">/// assert!(eq(Instant::now(), start + ms(500)));</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">after</span>(<span class="ident">duration</span>: <span class="ident">Duration</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Receiver</span><span class="op"><</span><span class="ident">Instant</span><span class="op">></span> {
<span class="ident">Receiver</span> {
<span class="ident">flavor</span>: <span class="ident">ReceiverFlavor</span>::<span class="ident">After</span>(<span class="ident">Arc</span>::<span class="ident">new</span>(<span class="ident">flavors</span>::<span class="ident">after</span>::<span class="ident">Channel</span>::<span class="ident">new</span>(<span class="ident">duration</span>))),
}
}
<span class="doccomment">/// Creates a receiver that never delivers messages.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The channel is bounded with capacity of 0 and never gets disconnected.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Using a `never` channel to optionally add a timeout to [`select!`]:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// # #[macro_use]</span>
<span class="doccomment">/// # extern crate crossbeam_channel;</span>
<span class="doccomment">/// # fn main() {</span>
<span class="doccomment">/// use std::thread;</span>
<span class="doccomment">/// use std::time::{Duration, Instant};</span>
<span class="doccomment">/// use crossbeam_channel::{after, never, unbounded};</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let (s, r) = unbounded();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// thread::spawn(move || {</span>
<span class="doccomment">/// thread::sleep(Duration::from_secs(1));</span>
<span class="doccomment">/// s.send(1).unwrap();</span>
<span class="doccomment">/// });</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // Suppose this duration can be a `Some` or a `None`.</span>
<span class="doccomment">/// let duration = Some(Duration::from_millis(100));</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // Create a channel that times out after the specified duration.</span>
<span class="doccomment">/// let timeout = duration</span>
<span class="doccomment">/// .map(|d| after(d))</span>
<span class="doccomment">/// .unwrap_or(never());</span>
<span class="doccomment">///</span>
<span class="doccomment">/// select! {</span>
<span class="doccomment">/// recv(r) -> msg => assert_eq!(msg, Ok(1)),</span>
<span class="doccomment">/// recv(timeout) -> _ => println!("timed out"),</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// # }</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`select!`]: macro.select.html</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">never</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>() <span class="op">-</span><span class="op">></span> <span class="ident">Receiver</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="ident">Receiver</span> {
<span class="ident">flavor</span>: <span class="ident">ReceiverFlavor</span>::<span class="ident">Never</span>(<span class="ident">flavors</span>::<span class="ident">never</span>::<span class="ident">Channel</span>::<span class="ident">new</span>()),
}
}
<span class="doccomment">/// Creates a receiver that delivers messages periodically.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The channel is bounded with capacity of 1 and never gets disconnected. Messages will be</span>
<span class="doccomment">/// sent into the channel in intervals of `duration`. Each message is the instant at which it is</span>
<span class="doccomment">/// sent.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Using a `tick` channel to periodically print elapsed time:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::time::{Duration, Instant};</span>
<span class="doccomment">/// use crossbeam_channel::tick;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let start = Instant::now();</span>
<span class="doccomment">/// let ticker = tick(Duration::from_millis(100));</span>
<span class="doccomment">///</span>
<span class="doccomment">/// for _ in 0..5 {</span>
<span class="doccomment">/// ticker.recv().unwrap();</span>
<span class="doccomment">/// println!("elapsed: {:?}", start.elapsed());</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// When messages get sent:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::thread;</span>
<span class="doccomment">/// use std::time::{Duration, Instant};</span>
<span class="doccomment">/// use crossbeam_channel::tick;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // Converts a number of milliseconds into a `Duration`.</span>
<span class="doccomment">/// let ms = |ms| Duration::from_millis(ms);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // Returns `true` if `a` and `b` are very close `Instant`s.</span>
<span class="doccomment">/// let eq = |a, b| a + ms(50) > b && b + ms(50) > a;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let start = Instant::now();</span>
<span class="doccomment">/// let r = tick(ms(100));</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // This message was sent 100 ms from the start and received 100 ms from the start.</span>
<span class="doccomment">/// assert!(eq(r.recv().unwrap(), start + ms(100)));</span>
<span class="doccomment">/// assert!(eq(Instant::now(), start + ms(100)));</span>
<span class="doccomment">///</span>
<span class="doccomment">/// thread::sleep(ms(500));</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // This message was sent 200 ms from the start and received 600 ms from the start.</span>
<span class="doccomment">/// assert!(eq(r.recv().unwrap(), start + ms(200)));</span>
<span class="doccomment">/// assert!(eq(Instant::now(), start + ms(600)));</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // This message was sent 700 ms from the start and received 700 ms from the start.</span>
<span class="doccomment">/// assert!(eq(r.recv().unwrap(), start + ms(700)));</span>
<span class="doccomment">/// assert!(eq(Instant::now(), start + ms(700)));</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">tick</span>(<span class="ident">duration</span>: <span class="ident">Duration</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Receiver</span><span class="op"><</span><span class="ident">Instant</span><span class="op">></span> {
<span class="ident">Receiver</span> {
<span class="ident">flavor</span>: <span class="ident">ReceiverFlavor</span>::<span class="ident">Tick</span>(<span class="ident">Arc</span>::<span class="ident">new</span>(<span class="ident">flavors</span>::<span class="ident">tick</span>::<span class="ident">Channel</span>::<span class="ident">new</span>(<span class="ident">duration</span>))),
}
}
<span class="doccomment">/// The sending side of a channel.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::thread;</span>
<span class="doccomment">/// use crossbeam_channel::unbounded;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let (s1, r) = unbounded();</span>
<span class="doccomment">/// let s2 = s1.clone();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// thread::spawn(move || s1.send(1).unwrap());</span>
<span class="doccomment">/// thread::spawn(move || s2.send(2).unwrap());</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let msg1 = r.recv().unwrap();</span>
<span class="doccomment">/// let msg2 = r.recv().unwrap();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(msg1 + msg2, 3);</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Sender</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="ident">flavor</span>: <span class="ident">SenderFlavor</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>,
}
<span class="doccomment">/// Sender flavors.</span>
<span class="kw">enum</span> <span class="ident">SenderFlavor</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="doccomment">/// Bounded channel based on a preallocated array.</span>
<span class="ident">Array</span>(<span class="ident">counter</span>::<span class="ident">Sender</span><span class="op"><</span><span class="ident">flavors</span>::<span class="ident">array</span>::<span class="ident">Channel</span><span class="op"><</span><span class="ident">T</span><span class="op">></span><span class="op">></span>),
<span class="doccomment">/// Unbounded channel implemented as a linked list.</span>
<span class="ident">List</span>(<span class="ident">counter</span>::<span class="ident">Sender</span><span class="op"><</span><span class="ident">flavors</span>::<span class="ident">list</span>::<span class="ident">Channel</span><span class="op"><</span><span class="ident">T</span><span class="op">></span><span class="op">></span>),
<span class="doccomment">/// Zero-capacity channel.</span>
<span class="ident">Zero</span>(<span class="ident">counter</span>::<span class="ident">Sender</span><span class="op"><</span><span class="ident">flavors</span>::<span class="ident">zero</span>::<span class="ident">Channel</span><span class="op"><</span><span class="ident">T</span><span class="op">></span><span class="op">></span>),
}
<span class="kw">unsafe</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Send</span><span class="op">></span> <span class="ident">Send</span> <span class="kw">for</span> <span class="ident">Sender</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {}
<span class="kw">unsafe</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Send</span><span class="op">></span> <span class="ident">Sync</span> <span class="kw">for</span> <span class="ident">Sender</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">UnwindSafe</span> <span class="kw">for</span> <span class="ident">Sender</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">RefUnwindSafe</span> <span class="kw">for</span> <span class="ident">Sender</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">Sender</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="doccomment">/// Attempts to send a message into the channel without blocking.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This method will either send a message into the channel immediately or return an error if</span>
<span class="doccomment">/// the channel is full or disconnected. The returned error contains the original message.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// If called on a zero-capacity channel, this method will send the message only if there</span>
<span class="doccomment">/// happens to be a receive operation on the other side of the channel at the same time.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use crossbeam_channel::{bounded, TrySendError};</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let (s, r) = bounded(1);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(s.try_send(1), Ok(()));</span>
<span class="doccomment">/// assert_eq!(s.try_send(2), Err(TrySendError::Full(2)));</span>
<span class="doccomment">///</span>
<span class="doccomment">/// drop(r);</span>
<span class="doccomment">/// assert_eq!(s.try_send(3), Err(TrySendError::Disconnected(3)));</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">try_send</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">msg</span>: <span class="ident">T</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Result</span><span class="op"><</span>(), <span class="ident">TrySendError</span><span class="op"><</span><span class="ident">T</span><span class="op">></span><span class="op">></span> {
<span class="kw">match</span> <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">flavor</span> {
<span class="ident">SenderFlavor</span>::<span class="ident">Array</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">try_send</span>(<span class="ident">msg</span>),
<span class="ident">SenderFlavor</span>::<span class="ident">List</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">try_send</span>(<span class="ident">msg</span>),
<span class="ident">SenderFlavor</span>::<span class="ident">Zero</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">try_send</span>(<span class="ident">msg</span>),
}
}
<span class="doccomment">/// Blocks the current thread until a message is sent or the channel is disconnected.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// If the channel is full and not disconnected, this call will block until the send operation</span>
<span class="doccomment">/// can proceed. If the channel becomes disconnected, this call will wake up and return an</span>
<span class="doccomment">/// error. The returned error contains the original message.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// If called on a zero-capacity channel, this method will wait for a receive operation to</span>
<span class="doccomment">/// appear on the other side of the channel.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::thread;</span>
<span class="doccomment">/// use std::time::Duration;</span>
<span class="doccomment">/// use crossbeam_channel::{bounded, SendError};</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let (s, r) = bounded(1);</span>
<span class="doccomment">/// assert_eq!(s.send(1), Ok(()));</span>
<span class="doccomment">///</span>
<span class="doccomment">/// thread::spawn(move || {</span>
<span class="doccomment">/// assert_eq!(r.recv(), Ok(1));</span>
<span class="doccomment">/// thread::sleep(Duration::from_secs(1));</span>
<span class="doccomment">/// drop(r);</span>
<span class="doccomment">/// });</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(s.send(2), Ok(()));</span>
<span class="doccomment">/// assert_eq!(s.send(3), Err(SendError(3)));</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">send</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">msg</span>: <span class="ident">T</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Result</span><span class="op"><</span>(), <span class="ident">SendError</span><span class="op"><</span><span class="ident">T</span><span class="op">></span><span class="op">></span> {
<span class="kw">match</span> <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">flavor</span> {
<span class="ident">SenderFlavor</span>::<span class="ident">Array</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">send</span>(<span class="ident">msg</span>, <span class="prelude-val">None</span>),
<span class="ident">SenderFlavor</span>::<span class="ident">List</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">send</span>(<span class="ident">msg</span>, <span class="prelude-val">None</span>),
<span class="ident">SenderFlavor</span>::<span class="ident">Zero</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">send</span>(<span class="ident">msg</span>, <span class="prelude-val">None</span>),
}.<span class="ident">map_err</span>(<span class="op">|</span><span class="ident">err</span><span class="op">|</span> <span class="kw">match</span> <span class="ident">err</span> {
<span class="ident">SendTimeoutError</span>::<span class="ident">Disconnected</span>(<span class="ident">msg</span>) <span class="op">=</span><span class="op">></span> <span class="ident">SendError</span>(<span class="ident">msg</span>),
<span class="ident">SendTimeoutError</span>::<span class="ident">Timeout</span>(<span class="kw">_</span>) <span class="op">=</span><span class="op">></span> <span class="macro">unreachable</span><span class="macro">!</span>(),
})
}
<span class="doccomment">/// Waits for a message to be sent into the channel, but only for a limited time.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// If the channel is full and not disconnected, this call will block until the send operation</span>
<span class="doccomment">/// can proceed or the operation times out. If the channel becomes disconnected, this call will</span>
<span class="doccomment">/// wake up and return an error. The returned error contains the original message.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// If called on a zero-capacity channel, this method will wait for a receive operation to</span>
<span class="doccomment">/// appear on the other side of the channel.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::thread;</span>
<span class="doccomment">/// use std::time::Duration;</span>
<span class="doccomment">/// use crossbeam_channel::{bounded, SendTimeoutError};</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let (s, r) = bounded(0);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// thread::spawn(move || {</span>
<span class="doccomment">/// thread::sleep(Duration::from_secs(1));</span>
<span class="doccomment">/// assert_eq!(r.recv(), Ok(2));</span>
<span class="doccomment">/// drop(r);</span>
<span class="doccomment">/// });</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(</span>
<span class="doccomment">/// s.send_timeout(1, Duration::from_millis(500)),</span>
<span class="doccomment">/// Err(SendTimeoutError::Timeout(1)),</span>
<span class="doccomment">/// );</span>
<span class="doccomment">/// assert_eq!(</span>
<span class="doccomment">/// s.send_timeout(2, Duration::from_secs(1)),</span>
<span class="doccomment">/// Ok(()),</span>
<span class="doccomment">/// );</span>
<span class="doccomment">/// assert_eq!(</span>
<span class="doccomment">/// s.send_timeout(3, Duration::from_millis(500)),</span>
<span class="doccomment">/// Err(SendTimeoutError::Disconnected(3)),</span>
<span class="doccomment">/// );</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">send_timeout</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">msg</span>: <span class="ident">T</span>, <span class="ident">timeout</span>: <span class="ident">Duration</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Result</span><span class="op"><</span>(), <span class="ident">SendTimeoutError</span><span class="op"><</span><span class="ident">T</span><span class="op">></span><span class="op">></span> {
<span class="kw">let</span> <span class="ident">deadline</span> <span class="op">=</span> <span class="ident">Instant</span>::<span class="ident">now</span>() <span class="op">+</span> <span class="ident">timeout</span>;
<span class="kw">match</span> <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">flavor</span> {
<span class="ident">SenderFlavor</span>::<span class="ident">Array</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">send</span>(<span class="ident">msg</span>, <span class="prelude-val">Some</span>(<span class="ident">deadline</span>)),
<span class="ident">SenderFlavor</span>::<span class="ident">List</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">send</span>(<span class="ident">msg</span>, <span class="prelude-val">Some</span>(<span class="ident">deadline</span>)),
<span class="ident">SenderFlavor</span>::<span class="ident">Zero</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">send</span>(<span class="ident">msg</span>, <span class="prelude-val">Some</span>(<span class="ident">deadline</span>)),
}
}
<span class="doccomment">/// Returns `true` if the channel is empty.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Note: Zero-capacity channels are always empty.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use crossbeam_channel::unbounded;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let (s, r) = unbounded();</span>
<span class="doccomment">/// assert!(s.is_empty());</span>
<span class="doccomment">///</span>
<span class="doccomment">/// s.send(0).unwrap();</span>
<span class="doccomment">/// assert!(!s.is_empty());</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_empty</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">bool</span> {
<span class="kw">match</span> <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">flavor</span> {
<span class="ident">SenderFlavor</span>::<span class="ident">Array</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">is_empty</span>(),
<span class="ident">SenderFlavor</span>::<span class="ident">List</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">is_empty</span>(),
<span class="ident">SenderFlavor</span>::<span class="ident">Zero</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">is_empty</span>(),
}
}
<span class="doccomment">/// Returns `true` if the channel is full.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Note: Zero-capacity channels are always full.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use crossbeam_channel::bounded;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let (s, r) = bounded(1);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert!(!s.is_full());</span>
<span class="doccomment">/// s.send(0).unwrap();</span>
<span class="doccomment">/// assert!(s.is_full());</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_full</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">bool</span> {
<span class="kw">match</span> <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">flavor</span> {
<span class="ident">SenderFlavor</span>::<span class="ident">Array</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">is_full</span>(),
<span class="ident">SenderFlavor</span>::<span class="ident">List</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">is_full</span>(),
<span class="ident">SenderFlavor</span>::<span class="ident">Zero</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">is_full</span>(),
}
}
<span class="doccomment">/// Returns the number of messages in the channel.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use crossbeam_channel::unbounded;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let (s, r) = unbounded();</span>
<span class="doccomment">/// assert_eq!(s.len(), 0);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// s.send(1).unwrap();</span>
<span class="doccomment">/// s.send(2).unwrap();</span>
<span class="doccomment">/// assert_eq!(s.len(), 2);</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">len</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">usize</span> {
<span class="kw">match</span> <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">flavor</span> {
<span class="ident">SenderFlavor</span>::<span class="ident">Array</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">len</span>(),
<span class="ident">SenderFlavor</span>::<span class="ident">List</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">len</span>(),
<span class="ident">SenderFlavor</span>::<span class="ident">Zero</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">len</span>(),
}
}
<span class="doccomment">/// If the channel is bounded, returns its capacity.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use crossbeam_channel::{bounded, unbounded};</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let (s, _) = unbounded::<i32>();</span>
<span class="doccomment">/// assert_eq!(s.capacity(), None);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let (s, _) = bounded::<i32>(5);</span>
<span class="doccomment">/// assert_eq!(s.capacity(), Some(5));</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let (s, _) = bounded::<i32>(0);</span>
<span class="doccomment">/// assert_eq!(s.capacity(), Some(0));</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">capacity</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> {
<span class="kw">match</span> <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">flavor</span> {
<span class="ident">SenderFlavor</span>::<span class="ident">Array</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">capacity</span>(),
<span class="ident">SenderFlavor</span>::<span class="ident">List</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">capacity</span>(),
<span class="ident">SenderFlavor</span>::<span class="ident">Zero</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">capacity</span>(),
}
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">Drop</span> <span class="kw">for</span> <span class="ident">Sender</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">drop</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) {
<span class="kw">unsafe</span> {
<span class="kw">match</span> <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">flavor</span> {
<span class="ident">SenderFlavor</span>::<span class="ident">Array</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">release</span>(<span class="op">|</span><span class="ident">c</span><span class="op">|</span> <span class="ident">c</span>.<span class="ident">disconnect</span>()),
<span class="ident">SenderFlavor</span>::<span class="ident">List</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">release</span>(<span class="op">|</span><span class="ident">c</span><span class="op">|</span> <span class="ident">c</span>.<span class="ident">disconnect</span>()),
<span class="ident">SenderFlavor</span>::<span class="ident">Zero</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">release</span>(<span class="op">|</span><span class="ident">c</span><span class="op">|</span> <span class="ident">c</span>.<span class="ident">disconnect</span>()),
}
}
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">Clone</span> <span class="kw">for</span> <span class="ident">Sender</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">clone</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
<span class="kw">let</span> <span class="ident">flavor</span> <span class="op">=</span> <span class="kw">match</span> <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">flavor</span> {
<span class="ident">SenderFlavor</span>::<span class="ident">Array</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">SenderFlavor</span>::<span class="ident">Array</span>(<span class="ident">chan</span>.<span class="ident">acquire</span>()),
<span class="ident">SenderFlavor</span>::<span class="ident">List</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">SenderFlavor</span>::<span class="ident">List</span>(<span class="ident">chan</span>.<span class="ident">acquire</span>()),
<span class="ident">SenderFlavor</span>::<span class="ident">Zero</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">SenderFlavor</span>::<span class="ident">Zero</span>(<span class="ident">chan</span>.<span class="ident">acquire</span>()),
};
<span class="ident">Sender</span> { <span class="ident">flavor</span> }
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">Sender</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-</span><span class="op">></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
<span class="ident">f</span>.<span class="ident">pad</span>(<span class="string">"Sender { .. }"</span>)
}
}
<span class="doccomment">/// The receiving side of a channel.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::thread;</span>
<span class="doccomment">/// use std::time::Duration;</span>
<span class="doccomment">/// use crossbeam_channel::unbounded;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let (s, r) = unbounded();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// thread::spawn(move || {</span>
<span class="doccomment">/// s.send(1);</span>
<span class="doccomment">/// thread::sleep(Duration::from_secs(1));</span>
<span class="doccomment">/// s.send(2);</span>
<span class="doccomment">/// });</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(r.recv(), Ok(1)); // Received immediately.</span>
<span class="doccomment">/// assert_eq!(r.recv(), Ok(2)); // Received after 1 second.</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Receiver</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="ident">flavor</span>: <span class="ident">ReceiverFlavor</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>,
}
<span class="doccomment">/// Receiver flavors.</span>
<span class="kw">enum</span> <span class="ident">ReceiverFlavor</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="doccomment">/// Bounded channel based on a preallocated array.</span>
<span class="ident">Array</span>(<span class="ident">counter</span>::<span class="ident">Receiver</span><span class="op"><</span><span class="ident">flavors</span>::<span class="ident">array</span>::<span class="ident">Channel</span><span class="op"><</span><span class="ident">T</span><span class="op">></span><span class="op">></span>),
<span class="doccomment">/// Unbounded channel implemented as a linked list.</span>
<span class="ident">List</span>(<span class="ident">counter</span>::<span class="ident">Receiver</span><span class="op"><</span><span class="ident">flavors</span>::<span class="ident">list</span>::<span class="ident">Channel</span><span class="op"><</span><span class="ident">T</span><span class="op">></span><span class="op">></span>),
<span class="doccomment">/// Zero-capacity channel.</span>
<span class="ident">Zero</span>(<span class="ident">counter</span>::<span class="ident">Receiver</span><span class="op"><</span><span class="ident">flavors</span>::<span class="ident">zero</span>::<span class="ident">Channel</span><span class="op"><</span><span class="ident">T</span><span class="op">></span><span class="op">></span>),
<span class="doccomment">/// The after flavor.</span>
<span class="ident">After</span>(<span class="ident">Arc</span><span class="op"><</span><span class="ident">flavors</span>::<span class="ident">after</span>::<span class="ident">Channel</span><span class="op">></span>),
<span class="doccomment">/// The tick flavor.</span>
<span class="ident">Tick</span>(<span class="ident">Arc</span><span class="op"><</span><span class="ident">flavors</span>::<span class="ident">tick</span>::<span class="ident">Channel</span><span class="op">></span>),
<span class="doccomment">/// The never flavor.</span>
<span class="ident">Never</span>(<span class="ident">flavors</span>::<span class="ident">never</span>::<span class="ident">Channel</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>),
}
<span class="kw">unsafe</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Send</span><span class="op">></span> <span class="ident">Send</span> <span class="kw">for</span> <span class="ident">Receiver</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {}
<span class="kw">unsafe</span> <span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">Send</span><span class="op">></span> <span class="ident">Sync</span> <span class="kw">for</span> <span class="ident">Receiver</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">UnwindSafe</span> <span class="kw">for</span> <span class="ident">Receiver</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">RefUnwindSafe</span> <span class="kw">for</span> <span class="ident">Receiver</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">Receiver</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="doccomment">/// Attempts to receive a message from the channel without blocking.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This method will either receive a message from the channel immediately or return an error</span>
<span class="doccomment">/// if the channel is empty.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// If called on a zero-capacity channel, this method will receive a message only if there</span>
<span class="doccomment">/// happens to be a send operation on the other side of the channel at the same time.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use crossbeam_channel::{unbounded, TryRecvError};</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let (s, r) = unbounded();</span>
<span class="doccomment">/// assert_eq!(r.try_recv(), Err(TryRecvError::Empty));</span>
<span class="doccomment">///</span>
<span class="doccomment">/// s.send(5).unwrap();</span>
<span class="doccomment">/// drop(s);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(r.try_recv(), Ok(5));</span>
<span class="doccomment">/// assert_eq!(r.try_recv(), Err(TryRecvError::Disconnected));</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">try_recv</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">TryRecvError</span><span class="op">></span> {
<span class="kw">match</span> <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">flavor</span> {
<span class="ident">ReceiverFlavor</span>::<span class="ident">Array</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">try_recv</span>(),
<span class="ident">ReceiverFlavor</span>::<span class="ident">List</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">try_recv</span>(),
<span class="ident">ReceiverFlavor</span>::<span class="ident">Zero</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">try_recv</span>(),
<span class="ident">ReceiverFlavor</span>::<span class="ident">After</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> {
<span class="kw">let</span> <span class="ident">msg</span> <span class="op">=</span> <span class="ident">chan</span>.<span class="ident">try_recv</span>();
<span class="kw">unsafe</span> {
<span class="ident">mem</span>::<span class="ident">transmute_copy</span>::<span class="op"><</span><span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">Instant</span>, <span class="ident">TryRecvError</span><span class="op">></span>, <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">TryRecvError</span><span class="op">></span><span class="op">></span>(
<span class="kw-2">&</span><span class="ident">msg</span>,
)
}
}
<span class="ident">ReceiverFlavor</span>::<span class="ident">Tick</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> {
<span class="kw">let</span> <span class="ident">msg</span> <span class="op">=</span> <span class="ident">chan</span>.<span class="ident">try_recv</span>();
<span class="kw">unsafe</span> {
<span class="ident">mem</span>::<span class="ident">transmute_copy</span>::<span class="op"><</span><span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">Instant</span>, <span class="ident">TryRecvError</span><span class="op">></span>, <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">TryRecvError</span><span class="op">></span><span class="op">></span>(
<span class="kw-2">&</span><span class="ident">msg</span>,
)
}
}
<span class="ident">ReceiverFlavor</span>::<span class="ident">Never</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">try_recv</span>(),
}
}
<span class="doccomment">/// Blocks the current thread until a message is received or the channel is empty and</span>
<span class="doccomment">/// disconnected.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// If the channel is empty and not disconnected, this call will block until the receive</span>
<span class="doccomment">/// operation can proceed. If the channel is empty and becomes disconnected, this call will</span>
<span class="doccomment">/// wake up and return an error.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// If called on a zero-capacity channel, this method will wait for a send operation to appear</span>
<span class="doccomment">/// on the other side of the channel.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::thread;</span>
<span class="doccomment">/// use std::time::Duration;</span>
<span class="doccomment">/// use crossbeam_channel::{unbounded, RecvError};</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let (s, r) = unbounded();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// thread::spawn(move || {</span>
<span class="doccomment">/// thread::sleep(Duration::from_secs(1));</span>
<span class="doccomment">/// s.send(5).unwrap();</span>
<span class="doccomment">/// drop(s);</span>
<span class="doccomment">/// });</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(r.recv(), Ok(5));</span>
<span class="doccomment">/// assert_eq!(r.recv(), Err(RecvError));</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">recv</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">RecvError</span><span class="op">></span> {
<span class="kw">match</span> <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">flavor</span> {
<span class="ident">ReceiverFlavor</span>::<span class="ident">Array</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">recv</span>(<span class="prelude-val">None</span>),
<span class="ident">ReceiverFlavor</span>::<span class="ident">List</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">recv</span>(<span class="prelude-val">None</span>),
<span class="ident">ReceiverFlavor</span>::<span class="ident">Zero</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">recv</span>(<span class="prelude-val">None</span>),
<span class="ident">ReceiverFlavor</span>::<span class="ident">After</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> {
<span class="kw">let</span> <span class="ident">msg</span> <span class="op">=</span> <span class="ident">chan</span>.<span class="ident">recv</span>(<span class="prelude-val">None</span>);
<span class="kw">unsafe</span> {
<span class="ident">mem</span>::<span class="ident">transmute_copy</span>::<span class="op"><</span>
<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">Instant</span>, <span class="ident">RecvTimeoutError</span><span class="op">></span>,
<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">RecvTimeoutError</span><span class="op">></span>,
<span class="op">></span>(<span class="kw-2">&</span><span class="ident">msg</span>)
}
}
<span class="ident">ReceiverFlavor</span>::<span class="ident">Tick</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> {
<span class="kw">let</span> <span class="ident">msg</span> <span class="op">=</span> <span class="ident">chan</span>.<span class="ident">recv</span>(<span class="prelude-val">None</span>);
<span class="kw">unsafe</span> {
<span class="ident">mem</span>::<span class="ident">transmute_copy</span>::<span class="op"><</span>
<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">Instant</span>, <span class="ident">RecvTimeoutError</span><span class="op">></span>,
<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">RecvTimeoutError</span><span class="op">></span>,
<span class="op">></span>(<span class="kw-2">&</span><span class="ident">msg</span>)
}
}
<span class="ident">ReceiverFlavor</span>::<span class="ident">Never</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">recv</span>(<span class="prelude-val">None</span>),
}.<span class="ident">map_err</span>(<span class="op">|</span><span class="kw">_</span><span class="op">|</span> <span class="ident">RecvError</span>)
}
<span class="doccomment">/// Waits for a message to be received from the channel, but only for a limited time.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// If the channel is empty and not disconnected, this call will block until the receive</span>
<span class="doccomment">/// operation can proceed or the operation times out. If the channel is empty and becomes</span>
<span class="doccomment">/// disconnected, this call will wake up and return an error.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// If called on a zero-capacity channel, this method will wait for a send operation to appear</span>
<span class="doccomment">/// on the other side of the channel.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::thread;</span>
<span class="doccomment">/// use std::time::Duration;</span>
<span class="doccomment">/// use crossbeam_channel::{unbounded, RecvTimeoutError};</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let (s, r) = unbounded();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// thread::spawn(move || {</span>
<span class="doccomment">/// thread::sleep(Duration::from_secs(1));</span>
<span class="doccomment">/// s.send(5).unwrap();</span>
<span class="doccomment">/// drop(s);</span>
<span class="doccomment">/// });</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(</span>
<span class="doccomment">/// r.recv_timeout(Duration::from_millis(500)),</span>
<span class="doccomment">/// Err(RecvTimeoutError::Timeout),</span>
<span class="doccomment">/// );</span>
<span class="doccomment">/// assert_eq!(</span>
<span class="doccomment">/// r.recv_timeout(Duration::from_secs(1)),</span>
<span class="doccomment">/// Ok(5),</span>
<span class="doccomment">/// );</span>
<span class="doccomment">/// assert_eq!(</span>
<span class="doccomment">/// r.recv_timeout(Duration::from_secs(1)),</span>
<span class="doccomment">/// Err(RecvTimeoutError::Disconnected),</span>
<span class="doccomment">/// );</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">recv_timeout</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">timeout</span>: <span class="ident">Duration</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">RecvTimeoutError</span><span class="op">></span> {
<span class="kw">let</span> <span class="ident">deadline</span> <span class="op">=</span> <span class="ident">Instant</span>::<span class="ident">now</span>() <span class="op">+</span> <span class="ident">timeout</span>;
<span class="kw">match</span> <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">flavor</span> {
<span class="ident">ReceiverFlavor</span>::<span class="ident">Array</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">recv</span>(<span class="prelude-val">Some</span>(<span class="ident">deadline</span>)),
<span class="ident">ReceiverFlavor</span>::<span class="ident">List</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">recv</span>(<span class="prelude-val">Some</span>(<span class="ident">deadline</span>)),
<span class="ident">ReceiverFlavor</span>::<span class="ident">Zero</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">recv</span>(<span class="prelude-val">Some</span>(<span class="ident">deadline</span>)),
<span class="ident">ReceiverFlavor</span>::<span class="ident">After</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> {
<span class="kw">let</span> <span class="ident">msg</span> <span class="op">=</span> <span class="ident">chan</span>.<span class="ident">recv</span>(<span class="prelude-val">Some</span>(<span class="ident">deadline</span>));
<span class="kw">unsafe</span> {
<span class="ident">mem</span>::<span class="ident">transmute_copy</span>::<span class="op"><</span>
<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">Instant</span>, <span class="ident">RecvTimeoutError</span><span class="op">></span>,
<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">RecvTimeoutError</span><span class="op">></span>,
<span class="op">></span>(<span class="kw-2">&</span><span class="ident">msg</span>)
}
}
<span class="ident">ReceiverFlavor</span>::<span class="ident">Tick</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> {
<span class="kw">let</span> <span class="ident">msg</span> <span class="op">=</span> <span class="ident">chan</span>.<span class="ident">recv</span>(<span class="prelude-val">Some</span>(<span class="ident">deadline</span>));
<span class="kw">unsafe</span> {
<span class="ident">mem</span>::<span class="ident">transmute_copy</span>::<span class="op"><</span>
<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">Instant</span>, <span class="ident">RecvTimeoutError</span><span class="op">></span>,
<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">RecvTimeoutError</span><span class="op">></span>,
<span class="op">></span>(<span class="kw-2">&</span><span class="ident">msg</span>)
}
}
<span class="ident">ReceiverFlavor</span>::<span class="ident">Never</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">recv</span>(<span class="prelude-val">Some</span>(<span class="ident">deadline</span>)),
}
}
<span class="doccomment">/// Returns `true` if the channel is empty.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Note: Zero-capacity channels are always empty.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use crossbeam_channel::unbounded;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let (s, r) = unbounded();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert!(r.is_empty());</span>
<span class="doccomment">/// s.send(0).unwrap();</span>
<span class="doccomment">/// assert!(!r.is_empty());</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_empty</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">bool</span> {
<span class="kw">match</span> <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">flavor</span> {
<span class="ident">ReceiverFlavor</span>::<span class="ident">Array</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">is_empty</span>(),
<span class="ident">ReceiverFlavor</span>::<span class="ident">List</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">is_empty</span>(),
<span class="ident">ReceiverFlavor</span>::<span class="ident">Zero</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">is_empty</span>(),
<span class="ident">ReceiverFlavor</span>::<span class="ident">After</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">is_empty</span>(),
<span class="ident">ReceiverFlavor</span>::<span class="ident">Tick</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">is_empty</span>(),
<span class="ident">ReceiverFlavor</span>::<span class="ident">Never</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">is_empty</span>(),
}
}
<span class="doccomment">/// Returns `true` if the channel is full.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Note: Zero-capacity channels are always full.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use crossbeam_channel::bounded;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let (s, r) = bounded(1);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert!(!r.is_full());</span>
<span class="doccomment">/// s.send(0).unwrap();</span>
<span class="doccomment">/// assert!(r.is_full());</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">is_full</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">bool</span> {
<span class="kw">match</span> <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">flavor</span> {
<span class="ident">ReceiverFlavor</span>::<span class="ident">Array</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">is_full</span>(),
<span class="ident">ReceiverFlavor</span>::<span class="ident">List</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">is_full</span>(),
<span class="ident">ReceiverFlavor</span>::<span class="ident">Zero</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">is_full</span>(),
<span class="ident">ReceiverFlavor</span>::<span class="ident">After</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">is_full</span>(),
<span class="ident">ReceiverFlavor</span>::<span class="ident">Tick</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">is_full</span>(),
<span class="ident">ReceiverFlavor</span>::<span class="ident">Never</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">is_full</span>(),
}
}
<span class="doccomment">/// Returns the number of messages in the channel.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use crossbeam_channel::unbounded;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let (s, r) = unbounded();</span>
<span class="doccomment">/// assert_eq!(r.len(), 0);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// s.send(1).unwrap();</span>
<span class="doccomment">/// s.send(2).unwrap();</span>
<span class="doccomment">/// assert_eq!(r.len(), 2);</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">len</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">usize</span> {
<span class="kw">match</span> <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">flavor</span> {
<span class="ident">ReceiverFlavor</span>::<span class="ident">Array</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">len</span>(),
<span class="ident">ReceiverFlavor</span>::<span class="ident">List</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">len</span>(),
<span class="ident">ReceiverFlavor</span>::<span class="ident">Zero</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">len</span>(),
<span class="ident">ReceiverFlavor</span>::<span class="ident">After</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">len</span>(),
<span class="ident">ReceiverFlavor</span>::<span class="ident">Tick</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">len</span>(),
<span class="ident">ReceiverFlavor</span>::<span class="ident">Never</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">len</span>(),
}
}
<span class="doccomment">/// If the channel is bounded, returns its capacity.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use crossbeam_channel::{bounded, unbounded};</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let (_, r) = unbounded::<i32>();</span>
<span class="doccomment">/// assert_eq!(r.capacity(), None);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let (_, r) = bounded::<i32>(5);</span>
<span class="doccomment">/// assert_eq!(r.capacity(), Some(5));</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let (_, r) = bounded::<i32>(0);</span>
<span class="doccomment">/// assert_eq!(r.capacity(), Some(0));</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">capacity</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> {
<span class="kw">match</span> <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">flavor</span> {
<span class="ident">ReceiverFlavor</span>::<span class="ident">Array</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">capacity</span>(),
<span class="ident">ReceiverFlavor</span>::<span class="ident">List</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">capacity</span>(),
<span class="ident">ReceiverFlavor</span>::<span class="ident">Zero</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">capacity</span>(),
<span class="ident">ReceiverFlavor</span>::<span class="ident">After</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">capacity</span>(),
<span class="ident">ReceiverFlavor</span>::<span class="ident">Tick</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">capacity</span>(),
<span class="ident">ReceiverFlavor</span>::<span class="ident">Never</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">capacity</span>(),
}
}
<span class="doccomment">/// A blocking iterator over messages in the channel.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Each call to [`next`] blocks waiting for the next message and then returns it. However, if</span>
<span class="doccomment">/// the channel becomes empty and disconnected, it returns [`None`] without blocking.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`next`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#tymethod.next</span>
<span class="doccomment">/// [`None`]: https://doc.rust-lang.org/std/option/enum.Option.html#variant.None</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::thread;</span>
<span class="doccomment">/// use crossbeam_channel::unbounded;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let (s, r) = unbounded();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// thread::spawn(move || {</span>
<span class="doccomment">/// s.send(1).unwrap();</span>
<span class="doccomment">/// s.send(2).unwrap();</span>
<span class="doccomment">/// s.send(3).unwrap();</span>
<span class="doccomment">/// drop(s); // Disconnect the channel.</span>
<span class="doccomment">/// });</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // Collect all messages from the channel.</span>
<span class="doccomment">/// // Note that the call to `collect` blocks until the sender is dropped.</span>
<span class="doccomment">/// let v: Vec<_> = r.iter().collect();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(v, [1, 2, 3]);</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">iter</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">Iter</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="ident">Iter</span> { <span class="ident">receiver</span>: <span class="self">self</span> }
}
<span class="doccomment">/// A non-blocking iterator over messages in the channel.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Each call to [`next`] returns a message if there is one ready to be received. The iterator</span>
<span class="doccomment">/// never blocks waiting for the next message.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`next`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#tymethod.next</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::thread;</span>
<span class="doccomment">/// use std::time::Duration;</span>
<span class="doccomment">/// use crossbeam_channel::unbounded;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let (s, r) = unbounded::<i32>();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// thread::spawn(move || {</span>
<span class="doccomment">/// s.send(1).unwrap();</span>
<span class="doccomment">/// thread::sleep(Duration::from_secs(1));</span>
<span class="doccomment">/// s.send(2).unwrap();</span>
<span class="doccomment">/// thread::sleep(Duration::from_secs(2));</span>
<span class="doccomment">/// s.send(3).unwrap();</span>
<span class="doccomment">/// });</span>
<span class="doccomment">///</span>
<span class="doccomment">/// thread::sleep(Duration::from_secs(2));</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // Collect all messages from the channel without blocking.</span>
<span class="doccomment">/// // The third message hasn't been sent yet so we'll collect only the first two.</span>
<span class="doccomment">/// let v: Vec<_> = r.try_iter().collect();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(v, [1, 2]);</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">try_iter</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">TryIter</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="ident">TryIter</span> { <span class="ident">receiver</span>: <span class="self">self</span> }
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">Drop</span> <span class="kw">for</span> <span class="ident">Receiver</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">drop</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) {
<span class="kw">unsafe</span> {
<span class="kw">match</span> <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">flavor</span> {
<span class="ident">ReceiverFlavor</span>::<span class="ident">Array</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">release</span>(<span class="op">|</span><span class="ident">c</span><span class="op">|</span> <span class="ident">c</span>.<span class="ident">disconnect</span>()),
<span class="ident">ReceiverFlavor</span>::<span class="ident">List</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">release</span>(<span class="op">|</span><span class="ident">c</span><span class="op">|</span> <span class="ident">c</span>.<span class="ident">disconnect</span>()),
<span class="ident">ReceiverFlavor</span>::<span class="ident">Zero</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">release</span>(<span class="op">|</span><span class="ident">c</span><span class="op">|</span> <span class="ident">c</span>.<span class="ident">disconnect</span>()),
<span class="ident">ReceiverFlavor</span>::<span class="ident">After</span>(<span class="kw">_</span>) <span class="op">=</span><span class="op">></span> {},
<span class="ident">ReceiverFlavor</span>::<span class="ident">Tick</span>(<span class="kw">_</span>) <span class="op">=</span><span class="op">></span> {},
<span class="ident">ReceiverFlavor</span>::<span class="ident">Never</span>(<span class="kw">_</span>) <span class="op">=</span><span class="op">></span> {},
}
}
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">Clone</span> <span class="kw">for</span> <span class="ident">Receiver</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">clone</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span> {
<span class="kw">let</span> <span class="ident">flavor</span> <span class="op">=</span> <span class="kw">match</span> <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">flavor</span> {
<span class="ident">ReceiverFlavor</span>::<span class="ident">Array</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">ReceiverFlavor</span>::<span class="ident">Array</span>(<span class="ident">chan</span>.<span class="ident">acquire</span>()),
<span class="ident">ReceiverFlavor</span>::<span class="ident">List</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">ReceiverFlavor</span>::<span class="ident">List</span>(<span class="ident">chan</span>.<span class="ident">acquire</span>()),
<span class="ident">ReceiverFlavor</span>::<span class="ident">Zero</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">ReceiverFlavor</span>::<span class="ident">Zero</span>(<span class="ident">chan</span>.<span class="ident">acquire</span>()),
<span class="ident">ReceiverFlavor</span>::<span class="ident">After</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">ReceiverFlavor</span>::<span class="ident">After</span>(<span class="ident">chan</span>.<span class="ident">clone</span>()),
<span class="ident">ReceiverFlavor</span>::<span class="ident">Tick</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">ReceiverFlavor</span>::<span class="ident">Tick</span>(<span class="ident">chan</span>.<span class="ident">clone</span>()),
<span class="ident">ReceiverFlavor</span>::<span class="ident">Never</span>(<span class="kw">_</span>) <span class="op">=</span><span class="op">></span> <span class="ident">ReceiverFlavor</span>::<span class="ident">Never</span>(<span class="ident">flavors</span>::<span class="ident">never</span>::<span class="ident">Channel</span>::<span class="ident">new</span>()),
};
<span class="ident">Receiver</span> { <span class="ident">flavor</span> }
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">Receiver</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-</span><span class="op">></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
<span class="ident">f</span>.<span class="ident">pad</span>(<span class="string">"Receiver { .. }"</span>)
}
}
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">IntoIterator</span> <span class="kw">for</span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">Receiver</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="ident">T</span>;
<span class="kw">type</span> <span class="ident">IntoIter</span> <span class="op">=</span> <span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span>;
<span class="kw">fn</span> <span class="ident">into_iter</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span>::<span class="ident">IntoIter</span> {
<span class="self">self</span>.<span class="ident">iter</span>()
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">IntoIterator</span> <span class="kw">for</span> <span class="ident">Receiver</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="ident">T</span>;
<span class="kw">type</span> <span class="ident">IntoIter</span> <span class="op">=</span> <span class="ident">IntoIter</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>;
<span class="kw">fn</span> <span class="ident">into_iter</span>(<span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="self">Self</span>::<span class="ident">IntoIter</span> {
<span class="ident">IntoIter</span> { <span class="ident">receiver</span>: <span class="self">self</span> }
}
}
<span class="doccomment">/// A blocking iterator over messages in a channel.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Each call to [`next`] blocks waiting for the next message and then returns it. However, if the</span>
<span class="doccomment">/// channel becomes empty and disconnected, it returns [`None`] without blocking.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`next`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#tymethod.next</span>
<span class="doccomment">/// [`None`]: https://doc.rust-lang.org/std/option/enum.Option.html#variant.None</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::thread;</span>
<span class="doccomment">/// use crossbeam_channel::unbounded;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let (s, r) = unbounded();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// thread::spawn(move || {</span>
<span class="doccomment">/// s.send(1).unwrap();</span>
<span class="doccomment">/// s.send(2).unwrap();</span>
<span class="doccomment">/// s.send(3).unwrap();</span>
<span class="doccomment">/// drop(s); // Disconnect the channel.</span>
<span class="doccomment">/// });</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // Collect all messages from the channel.</span>
<span class="doccomment">/// // Note that the call to `collect` blocks until the sender is dropped.</span>
<span class="doccomment">/// let v: Vec<_> = r.iter().collect();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(v, [1, 2, 3]);</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="lifetime">'a</span><span class="op">></span> {
<span class="ident">receiver</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">Receiver</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>,
}
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">FusedIterator</span> <span class="kw">for</span> <span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> {}
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> {
<span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="ident">T</span>;
<span class="kw">fn</span> <span class="ident">next</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="self">Self</span>::<span class="ident">Item</span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">receiver</span>.<span class="ident">recv</span>().<span class="ident">ok</span>()
}
}
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">Iter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-</span><span class="op">></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
<span class="ident">f</span>.<span class="ident">pad</span>(<span class="string">"Iter { .. }"</span>)
}
}
<span class="doccomment">/// A non-blocking iterator over messages in a channel.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Each call to [`next`] returns a message if there is one ready to be received. The iterator</span>
<span class="doccomment">/// never blocks waiting for the next message.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`next`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#tymethod.next</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::thread;</span>
<span class="doccomment">/// use std::time::Duration;</span>
<span class="doccomment">/// use crossbeam_channel::unbounded;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let (s, r) = unbounded::<i32>();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// thread::spawn(move || {</span>
<span class="doccomment">/// s.send(1).unwrap();</span>
<span class="doccomment">/// thread::sleep(Duration::from_secs(1));</span>
<span class="doccomment">/// s.send(2).unwrap();</span>
<span class="doccomment">/// thread::sleep(Duration::from_secs(2));</span>
<span class="doccomment">/// s.send(3).unwrap();</span>
<span class="doccomment">/// });</span>
<span class="doccomment">///</span>
<span class="doccomment">/// thread::sleep(Duration::from_secs(2));</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // Collect all messages from the channel without blocking.</span>
<span class="doccomment">/// // The third message hasn't been sent yet so we'll collect only the first two.</span>
<span class="doccomment">/// let v: Vec<_> = r.try_iter().collect();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(v, [1, 2]);</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">TryIter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="lifetime">'a</span><span class="op">></span> {
<span class="ident">receiver</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">Receiver</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>,
}
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">TryIter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> {
<span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="ident">T</span>;
<span class="kw">fn</span> <span class="ident">next</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="self">Self</span>::<span class="ident">Item</span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">receiver</span>.<span class="ident">try_recv</span>().<span class="ident">ok</span>()
}
}
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">TryIter</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-</span><span class="op">></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
<span class="ident">f</span>.<span class="ident">pad</span>(<span class="string">"TryIter { .. }"</span>)
}
}
<span class="doccomment">/// A blocking iterator over messages in a channel.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Each call to [`next`] blocks waiting for the next message and then returns it. However, if the</span>
<span class="doccomment">/// channel becomes empty and disconnected, it returns [`None`] without blocking.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`next`]: https://doc.rust-lang.org/std/iter/trait.Iterator.html#tymethod.next</span>
<span class="doccomment">/// [`None`]: https://doc.rust-lang.org/std/option/enum.Option.html#variant.None</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::thread;</span>
<span class="doccomment">/// use crossbeam_channel::unbounded;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let (s, r) = unbounded();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// thread::spawn(move || {</span>
<span class="doccomment">/// s.send(1).unwrap();</span>
<span class="doccomment">/// s.send(2).unwrap();</span>
<span class="doccomment">/// s.send(3).unwrap();</span>
<span class="doccomment">/// drop(s); // Disconnect the channel.</span>
<span class="doccomment">/// });</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // Collect all messages from the channel.</span>
<span class="doccomment">/// // Note that the call to `collect` blocks until the sender is dropped.</span>
<span class="doccomment">/// let v: Vec<_> = r.into_iter().collect();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(v, [1, 2, 3]);</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">IntoIter</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="ident">receiver</span>: <span class="ident">Receiver</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>,
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">FusedIterator</span> <span class="kw">for</span> <span class="ident">IntoIter</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">IntoIter</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="ident">T</span>;
<span class="kw">fn</span> <span class="ident">next</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="self">Self</span>::<span class="ident">Item</span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">receiver</span>.<span class="ident">recv</span>().<span class="ident">ok</span>()
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">IntoIter</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-</span><span class="op">></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
<span class="ident">f</span>.<span class="ident">pad</span>(<span class="string">"IntoIter { .. }"</span>)
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">SelectHandle</span> <span class="kw">for</span> <span class="ident">Sender</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">try_select</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">token</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Token</span>) <span class="op">-</span><span class="op">></span> <span class="ident">bool</span> {
<span class="kw">match</span> <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">flavor</span> {
<span class="ident">SenderFlavor</span>::<span class="ident">Array</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">sender</span>().<span class="ident">try_select</span>(<span class="ident">token</span>),
<span class="ident">SenderFlavor</span>::<span class="ident">List</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">sender</span>().<span class="ident">try_select</span>(<span class="ident">token</span>),
<span class="ident">SenderFlavor</span>::<span class="ident">Zero</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">sender</span>().<span class="ident">try_select</span>(<span class="ident">token</span>),
}
}
<span class="kw">fn</span> <span class="ident">deadline</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">Instant</span><span class="op">></span> {
<span class="prelude-val">None</span>
}
<span class="kw">fn</span> <span class="ident">register</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">oper</span>: <span class="ident">Operation</span>, <span class="ident">cx</span>: <span class="kw-2">&</span><span class="ident">Context</span>) <span class="op">-</span><span class="op">></span> <span class="ident">bool</span> {
<span class="kw">match</span> <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">flavor</span> {
<span class="ident">SenderFlavor</span>::<span class="ident">Array</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">sender</span>().<span class="ident">register</span>(<span class="ident">oper</span>, <span class="ident">cx</span>),
<span class="ident">SenderFlavor</span>::<span class="ident">List</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">sender</span>().<span class="ident">register</span>(<span class="ident">oper</span>, <span class="ident">cx</span>),
<span class="ident">SenderFlavor</span>::<span class="ident">Zero</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">sender</span>().<span class="ident">register</span>(<span class="ident">oper</span>, <span class="ident">cx</span>),
}
}
<span class="kw">fn</span> <span class="ident">unregister</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">oper</span>: <span class="ident">Operation</span>) {
<span class="kw">match</span> <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">flavor</span> {
<span class="ident">SenderFlavor</span>::<span class="ident">Array</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">sender</span>().<span class="ident">unregister</span>(<span class="ident">oper</span>),
<span class="ident">SenderFlavor</span>::<span class="ident">List</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">sender</span>().<span class="ident">unregister</span>(<span class="ident">oper</span>),
<span class="ident">SenderFlavor</span>::<span class="ident">Zero</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">sender</span>().<span class="ident">unregister</span>(<span class="ident">oper</span>),
}
}
<span class="kw">fn</span> <span class="ident">accept</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">token</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Token</span>, <span class="ident">cx</span>: <span class="kw-2">&</span><span class="ident">Context</span>) <span class="op">-</span><span class="op">></span> <span class="ident">bool</span> {
<span class="kw">match</span> <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">flavor</span> {
<span class="ident">SenderFlavor</span>::<span class="ident">Array</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">sender</span>().<span class="ident">accept</span>(<span class="ident">token</span>, <span class="ident">cx</span>),
<span class="ident">SenderFlavor</span>::<span class="ident">List</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">sender</span>().<span class="ident">accept</span>(<span class="ident">token</span>, <span class="ident">cx</span>),
<span class="ident">SenderFlavor</span>::<span class="ident">Zero</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">sender</span>().<span class="ident">accept</span>(<span class="ident">token</span>, <span class="ident">cx</span>),
}
}
<span class="kw">fn</span> <span class="ident">is_ready</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">bool</span> {
<span class="kw">match</span> <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">flavor</span> {
<span class="ident">SenderFlavor</span>::<span class="ident">Array</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">sender</span>().<span class="ident">is_ready</span>(),
<span class="ident">SenderFlavor</span>::<span class="ident">List</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">sender</span>().<span class="ident">is_ready</span>(),
<span class="ident">SenderFlavor</span>::<span class="ident">Zero</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">sender</span>().<span class="ident">is_ready</span>(),
}
}
<span class="kw">fn</span> <span class="ident">watch</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">oper</span>: <span class="ident">Operation</span>, <span class="ident">cx</span>: <span class="kw-2">&</span><span class="ident">Context</span>) <span class="op">-</span><span class="op">></span> <span class="ident">bool</span> {
<span class="kw">match</span> <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">flavor</span> {
<span class="ident">SenderFlavor</span>::<span class="ident">Array</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">sender</span>().<span class="ident">watch</span>(<span class="ident">oper</span>, <span class="ident">cx</span>),
<span class="ident">SenderFlavor</span>::<span class="ident">List</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">sender</span>().<span class="ident">watch</span>(<span class="ident">oper</span>, <span class="ident">cx</span>),
<span class="ident">SenderFlavor</span>::<span class="ident">Zero</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">sender</span>().<span class="ident">watch</span>(<span class="ident">oper</span>, <span class="ident">cx</span>),
}
}
<span class="kw">fn</span> <span class="ident">unwatch</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">oper</span>: <span class="ident">Operation</span>) {
<span class="kw">match</span> <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">flavor</span> {
<span class="ident">SenderFlavor</span>::<span class="ident">Array</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">sender</span>().<span class="ident">unwatch</span>(<span class="ident">oper</span>),
<span class="ident">SenderFlavor</span>::<span class="ident">List</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">sender</span>().<span class="ident">unwatch</span>(<span class="ident">oper</span>),
<span class="ident">SenderFlavor</span>::<span class="ident">Zero</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">sender</span>().<span class="ident">unwatch</span>(<span class="ident">oper</span>),
}
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">SelectHandle</span> <span class="kw">for</span> <span class="ident">Receiver</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">try_select</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">token</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Token</span>) <span class="op">-</span><span class="op">></span> <span class="ident">bool</span> {
<span class="kw">match</span> <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">flavor</span> {
<span class="ident">ReceiverFlavor</span>::<span class="ident">Array</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">receiver</span>().<span class="ident">try_select</span>(<span class="ident">token</span>),
<span class="ident">ReceiverFlavor</span>::<span class="ident">List</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">receiver</span>().<span class="ident">try_select</span>(<span class="ident">token</span>),
<span class="ident">ReceiverFlavor</span>::<span class="ident">Zero</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">receiver</span>().<span class="ident">try_select</span>(<span class="ident">token</span>),
<span class="ident">ReceiverFlavor</span>::<span class="ident">After</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">try_select</span>(<span class="ident">token</span>),
<span class="ident">ReceiverFlavor</span>::<span class="ident">Tick</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">try_select</span>(<span class="ident">token</span>),
<span class="ident">ReceiverFlavor</span>::<span class="ident">Never</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">try_select</span>(<span class="ident">token</span>),
}
}
<span class="kw">fn</span> <span class="ident">deadline</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">Instant</span><span class="op">></span> {
<span class="kw">match</span> <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">flavor</span> {
<span class="ident">ReceiverFlavor</span>::<span class="ident">Array</span>(<span class="kw">_</span>) <span class="op">=</span><span class="op">></span> <span class="prelude-val">None</span>,
<span class="ident">ReceiverFlavor</span>::<span class="ident">List</span>(<span class="kw">_</span>) <span class="op">=</span><span class="op">></span> <span class="prelude-val">None</span>,
<span class="ident">ReceiverFlavor</span>::<span class="ident">Zero</span>(<span class="kw">_</span>) <span class="op">=</span><span class="op">></span> <span class="prelude-val">None</span>,
<span class="ident">ReceiverFlavor</span>::<span class="ident">After</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">deadline</span>(),
<span class="ident">ReceiverFlavor</span>::<span class="ident">Tick</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">deadline</span>(),
<span class="ident">ReceiverFlavor</span>::<span class="ident">Never</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">deadline</span>(),
}
}
<span class="kw">fn</span> <span class="ident">register</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">oper</span>: <span class="ident">Operation</span>, <span class="ident">cx</span>: <span class="kw-2">&</span><span class="ident">Context</span>) <span class="op">-</span><span class="op">></span> <span class="ident">bool</span> {
<span class="kw">match</span> <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">flavor</span> {
<span class="ident">ReceiverFlavor</span>::<span class="ident">Array</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">receiver</span>().<span class="ident">register</span>(<span class="ident">oper</span>, <span class="ident">cx</span>),
<span class="ident">ReceiverFlavor</span>::<span class="ident">List</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">receiver</span>().<span class="ident">register</span>(<span class="ident">oper</span>, <span class="ident">cx</span>),
<span class="ident">ReceiverFlavor</span>::<span class="ident">Zero</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">receiver</span>().<span class="ident">register</span>(<span class="ident">oper</span>, <span class="ident">cx</span>),
<span class="ident">ReceiverFlavor</span>::<span class="ident">After</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">register</span>(<span class="ident">oper</span>, <span class="ident">cx</span>),
<span class="ident">ReceiverFlavor</span>::<span class="ident">Tick</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">register</span>(<span class="ident">oper</span>, <span class="ident">cx</span>),
<span class="ident">ReceiverFlavor</span>::<span class="ident">Never</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">register</span>(<span class="ident">oper</span>, <span class="ident">cx</span>),
}
}
<span class="kw">fn</span> <span class="ident">unregister</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">oper</span>: <span class="ident">Operation</span>) {
<span class="kw">match</span> <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">flavor</span> {
<span class="ident">ReceiverFlavor</span>::<span class="ident">Array</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">receiver</span>().<span class="ident">unregister</span>(<span class="ident">oper</span>),
<span class="ident">ReceiverFlavor</span>::<span class="ident">List</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">receiver</span>().<span class="ident">unregister</span>(<span class="ident">oper</span>),
<span class="ident">ReceiverFlavor</span>::<span class="ident">Zero</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">receiver</span>().<span class="ident">unregister</span>(<span class="ident">oper</span>),
<span class="ident">ReceiverFlavor</span>::<span class="ident">After</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">unregister</span>(<span class="ident">oper</span>),
<span class="ident">ReceiverFlavor</span>::<span class="ident">Tick</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">unregister</span>(<span class="ident">oper</span>),
<span class="ident">ReceiverFlavor</span>::<span class="ident">Never</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">unregister</span>(<span class="ident">oper</span>),
}
}
<span class="kw">fn</span> <span class="ident">accept</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">token</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Token</span>, <span class="ident">cx</span>: <span class="kw-2">&</span><span class="ident">Context</span>) <span class="op">-</span><span class="op">></span> <span class="ident">bool</span> {
<span class="kw">match</span> <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">flavor</span> {
<span class="ident">ReceiverFlavor</span>::<span class="ident">Array</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">receiver</span>().<span class="ident">accept</span>(<span class="ident">token</span>, <span class="ident">cx</span>),
<span class="ident">ReceiverFlavor</span>::<span class="ident">List</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">receiver</span>().<span class="ident">accept</span>(<span class="ident">token</span>, <span class="ident">cx</span>),
<span class="ident">ReceiverFlavor</span>::<span class="ident">Zero</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">receiver</span>().<span class="ident">accept</span>(<span class="ident">token</span>, <span class="ident">cx</span>),
<span class="ident">ReceiverFlavor</span>::<span class="ident">After</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">accept</span>(<span class="ident">token</span>, <span class="ident">cx</span>),
<span class="ident">ReceiverFlavor</span>::<span class="ident">Tick</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">accept</span>(<span class="ident">token</span>, <span class="ident">cx</span>),
<span class="ident">ReceiverFlavor</span>::<span class="ident">Never</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">accept</span>(<span class="ident">token</span>, <span class="ident">cx</span>),
}
}
<span class="kw">fn</span> <span class="ident">is_ready</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-</span><span class="op">></span> <span class="ident">bool</span> {
<span class="kw">match</span> <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">flavor</span> {
<span class="ident">ReceiverFlavor</span>::<span class="ident">Array</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">receiver</span>().<span class="ident">is_ready</span>(),
<span class="ident">ReceiverFlavor</span>::<span class="ident">List</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">receiver</span>().<span class="ident">is_ready</span>(),
<span class="ident">ReceiverFlavor</span>::<span class="ident">Zero</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">receiver</span>().<span class="ident">is_ready</span>(),
<span class="ident">ReceiverFlavor</span>::<span class="ident">After</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">is_ready</span>(),
<span class="ident">ReceiverFlavor</span>::<span class="ident">Tick</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">is_ready</span>(),
<span class="ident">ReceiverFlavor</span>::<span class="ident">Never</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">is_ready</span>(),
}
}
<span class="kw">fn</span> <span class="ident">watch</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">oper</span>: <span class="ident">Operation</span>, <span class="ident">cx</span>: <span class="kw-2">&</span><span class="ident">Context</span>) <span class="op">-</span><span class="op">></span> <span class="ident">bool</span> {
<span class="kw">match</span> <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">flavor</span> {
<span class="ident">ReceiverFlavor</span>::<span class="ident">Array</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">receiver</span>().<span class="ident">watch</span>(<span class="ident">oper</span>, <span class="ident">cx</span>),
<span class="ident">ReceiverFlavor</span>::<span class="ident">List</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">receiver</span>().<span class="ident">watch</span>(<span class="ident">oper</span>, <span class="ident">cx</span>),
<span class="ident">ReceiverFlavor</span>::<span class="ident">Zero</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">receiver</span>().<span class="ident">watch</span>(<span class="ident">oper</span>, <span class="ident">cx</span>),
<span class="ident">ReceiverFlavor</span>::<span class="ident">After</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">watch</span>(<span class="ident">oper</span>, <span class="ident">cx</span>),
<span class="ident">ReceiverFlavor</span>::<span class="ident">Tick</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">watch</span>(<span class="ident">oper</span>, <span class="ident">cx</span>),
<span class="ident">ReceiverFlavor</span>::<span class="ident">Never</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">watch</span>(<span class="ident">oper</span>, <span class="ident">cx</span>),
}
}
<span class="kw">fn</span> <span class="ident">unwatch</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">oper</span>: <span class="ident">Operation</span>) {
<span class="kw">match</span> <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">flavor</span> {
<span class="ident">ReceiverFlavor</span>::<span class="ident">Array</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">receiver</span>().<span class="ident">unwatch</span>(<span class="ident">oper</span>),
<span class="ident">ReceiverFlavor</span>::<span class="ident">List</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">receiver</span>().<span class="ident">unwatch</span>(<span class="ident">oper</span>),
<span class="ident">ReceiverFlavor</span>::<span class="ident">Zero</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">receiver</span>().<span class="ident">unwatch</span>(<span class="ident">oper</span>),
<span class="ident">ReceiverFlavor</span>::<span class="ident">After</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">unwatch</span>(<span class="ident">oper</span>),
<span class="ident">ReceiverFlavor</span>::<span class="ident">Tick</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">unwatch</span>(<span class="ident">oper</span>),
<span class="ident">ReceiverFlavor</span>::<span class="ident">Never</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">unwatch</span>(<span class="ident">oper</span>),
}
}
}
<span class="doccomment">/// Writes a message into the channel.</span>
<span class="kw">pub</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">write</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">s</span>: <span class="kw-2">&</span><span class="ident">Sender</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>, <span class="ident">token</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Token</span>, <span class="ident">msg</span>: <span class="ident">T</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Result</span><span class="op"><</span>(), <span class="ident">T</span><span class="op">></span> {
<span class="kw">match</span> <span class="kw-2">&</span><span class="ident">s</span>.<span class="ident">flavor</span> {
<span class="ident">SenderFlavor</span>::<span class="ident">Array</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">write</span>(<span class="ident">token</span>, <span class="ident">msg</span>),
<span class="ident">SenderFlavor</span>::<span class="ident">List</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">write</span>(<span class="ident">token</span>, <span class="ident">msg</span>),
<span class="ident">SenderFlavor</span>::<span class="ident">Zero</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">write</span>(<span class="ident">token</span>, <span class="ident">msg</span>),
}
}
<span class="doccomment">/// Reads a message from the channel.</span>
<span class="kw">pub</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">read</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>(<span class="ident">r</span>: <span class="kw-2">&</span><span class="ident">Receiver</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>, <span class="ident">token</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Token</span>) <span class="op">-</span><span class="op">></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">T</span>, ()<span class="op">></span> {
<span class="kw">match</span> <span class="kw-2">&</span><span class="ident">r</span>.<span class="ident">flavor</span> {
<span class="ident">ReceiverFlavor</span>::<span class="ident">Array</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">read</span>(<span class="ident">token</span>),
<span class="ident">ReceiverFlavor</span>::<span class="ident">List</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">read</span>(<span class="ident">token</span>),
<span class="ident">ReceiverFlavor</span>::<span class="ident">Zero</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">read</span>(<span class="ident">token</span>),
<span class="ident">ReceiverFlavor</span>::<span class="ident">After</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> {
<span class="ident">mem</span>::<span class="ident">transmute_copy</span>::<span class="op"><</span><span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">Instant</span>, ()<span class="op">></span>, <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">T</span>, ()<span class="op">></span><span class="op">></span>(<span class="kw-2">&</span><span class="ident">chan</span>.<span class="ident">read</span>(<span class="ident">token</span>))
}
<span class="ident">ReceiverFlavor</span>::<span class="ident">Tick</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> {
<span class="ident">mem</span>::<span class="ident">transmute_copy</span>::<span class="op"><</span><span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">Instant</span>, ()<span class="op">></span>, <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">T</span>, ()<span class="op">></span><span class="op">></span>(<span class="kw-2">&</span><span class="ident">chan</span>.<span class="ident">read</span>(<span class="ident">token</span>))
}
<span class="ident">ReceiverFlavor</span>::<span class="ident">Never</span>(<span class="ident">chan</span>) <span class="op">=</span><span class="op">></span> <span class="ident">chan</span>.<span class="ident">read</span>(<span class="ident">token</span>),
}
}
</pre></div>
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