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<!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 of the Rust file `/root/.cargo/registry/src/github.com-1ecc6299db9ec823/crossbeam-channel-0.5.8/src/err.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>err.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../normalize.css"><link rel="stylesheet" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../ayu.css" disabled><link rel="stylesheet" href="../../dark.css" disabled><link rel="stylesheet" href="../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../storage.js"></script><script defer src="../../source-script.js"></script><script defer src="../../source-files.js"></script><script defer src="../../main.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../crossbeam_channel/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../crossbeam_channel/index.html"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></a><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span>
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</pre><pre class="rust"><code><span class="kw">use </span>std::error;
<span class="kw">use </span>std::fmt;
<span class="doccomment">/// An error returned from the [`send`] method.
///
/// The message could not be sent because the channel is disconnected.
///
/// The error contains the message so it can be recovered.
///
/// [`send`]: super::Sender::send
</span><span class="attribute">#[derive(PartialEq, Eq, Clone, Copy)]
</span><span class="kw">pub struct </span>SendError&lt;T&gt;(<span class="kw">pub </span>T);
<span class="doccomment">/// An error returned from the [`try_send`] method.
///
/// The error contains the message being sent so it can be recovered.
///
/// [`try_send`]: super::Sender::try_send
</span><span class="attribute">#[derive(PartialEq, Eq, Clone, Copy)]
</span><span class="kw">pub enum </span>TrySendError&lt;T&gt; {
<span class="doccomment">/// The message could not be sent because the channel is full.
///
/// If this is a zero-capacity channel, then the error indicates that there was no receiver
/// available to receive the message at the time.
</span>Full(T),
<span class="doccomment">/// The message could not be sent because the channel is disconnected.
</span>Disconnected(T),
}
<span class="doccomment">/// An error returned from the [`send_timeout`] method.
///
/// The error contains the message being sent so it can be recovered.
///
/// [`send_timeout`]: super::Sender::send_timeout
</span><span class="attribute">#[derive(PartialEq, Eq, Clone, Copy)]
</span><span class="kw">pub enum </span>SendTimeoutError&lt;T&gt; {
<span class="doccomment">/// The message could not be sent because the channel is full and the operation timed out.
///
/// If this is a zero-capacity channel, then the error indicates that there was no receiver
/// available to receive the message and the operation timed out.
</span>Timeout(T),
<span class="doccomment">/// The message could not be sent because the channel is disconnected.
</span>Disconnected(T),
}
<span class="doccomment">/// An error returned from the [`recv`] method.
///
/// A message could not be received because the channel is empty and disconnected.
///
/// [`recv`]: super::Receiver::recv
</span><span class="attribute">#[derive(PartialEq, Eq, Clone, Copy, Debug)]
</span><span class="kw">pub struct </span>RecvError;
<span class="doccomment">/// An error returned from the [`try_recv`] method.
///
/// [`try_recv`]: super::Receiver::try_recv
</span><span class="attribute">#[derive(PartialEq, Eq, Clone, Copy, Debug)]
</span><span class="kw">pub enum </span>TryRecvError {
<span class="doccomment">/// A message could not be received because the channel is empty.
///
/// If this is a zero-capacity channel, then the error indicates that there was no sender
/// available to send a message at the time.
</span>Empty,
<span class="doccomment">/// The message could not be received because the channel is empty and disconnected.
</span>Disconnected,
}
<span class="doccomment">/// An error returned from the [`recv_timeout`] method.
///
/// [`recv_timeout`]: super::Receiver::recv_timeout
</span><span class="attribute">#[derive(PartialEq, Eq, Clone, Copy, Debug)]
</span><span class="kw">pub enum </span>RecvTimeoutError {
<span class="doccomment">/// A message could not be received because the channel is empty and the operation timed out.
///
/// If this is a zero-capacity channel, then the error indicates that there was no sender
/// available to send a message and the operation timed out.
</span>Timeout,
<span class="doccomment">/// The message could not be received because the channel is empty and disconnected.
</span>Disconnected,
}
<span class="doccomment">/// An error returned from the [`try_select`] method.
///
/// Failed because none of the channel operations were ready.
///
/// [`try_select`]: super::Select::try_select
</span><span class="attribute">#[derive(PartialEq, Eq, Clone, Copy, Debug)]
</span><span class="kw">pub struct </span>TrySelectError;
<span class="doccomment">/// An error returned from the [`select_timeout`] method.
///
/// Failed because none of the channel operations became ready before the timeout.
///
/// [`select_timeout`]: super::Select::select_timeout
</span><span class="attribute">#[derive(PartialEq, Eq, Clone, Copy, Debug)]
</span><span class="kw">pub struct </span>SelectTimeoutError;
<span class="doccomment">/// An error returned from the [`try_ready`] method.
///
/// Failed because none of the channel operations were ready.
///
/// [`try_ready`]: super::Select::try_ready
</span><span class="attribute">#[derive(PartialEq, Eq, Clone, Copy, Debug)]
</span><span class="kw">pub struct </span>TryReadyError;
<span class="doccomment">/// An error returned from the [`ready_timeout`] method.
///
/// Failed because none of the channel operations became ready before the timeout.
///
/// [`ready_timeout`]: super::Select::ready_timeout
</span><span class="attribute">#[derive(PartialEq, Eq, Clone, Copy, Debug)]
</span><span class="kw">pub struct </span>ReadyTimeoutError;
<span class="kw">impl</span>&lt;T&gt; fmt::Debug <span class="kw">for </span>SendError&lt;T&gt; {
<span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>fmt::Formatter&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; fmt::Result {
<span class="string">&quot;SendError(..)&quot;</span>.fmt(f)
}
}
<span class="kw">impl</span>&lt;T&gt; fmt::Display <span class="kw">for </span>SendError&lt;T&gt; {
<span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>fmt::Formatter&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; fmt::Result {
<span class="string">&quot;sending on a disconnected channel&quot;</span>.fmt(f)
}
}
<span class="kw">impl</span>&lt;T: Send&gt; error::Error <span class="kw">for </span>SendError&lt;T&gt; {}
<span class="kw">impl</span>&lt;T&gt; SendError&lt;T&gt; {
<span class="doccomment">/// Unwraps the message.
///
/// # Examples
///
/// ```
/// use crossbeam_channel::unbounded;
///
/// let (s, r) = unbounded();
/// drop(r);
///
/// if let Err(err) = s.send(&quot;foo&quot;) {
/// assert_eq!(err.into_inner(), &quot;foo&quot;);
/// }
/// ```
</span><span class="kw">pub fn </span>into_inner(<span class="self">self</span>) -&gt; T {
<span class="self">self</span>.<span class="number">0
</span>}
}
<span class="kw">impl</span>&lt;T&gt; fmt::Debug <span class="kw">for </span>TrySendError&lt;T&gt; {
<span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>fmt::Formatter&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; fmt::Result {
<span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{
TrySendError::Full(..) =&gt; <span class="string">&quot;Full(..)&quot;</span>.fmt(f),
TrySendError::Disconnected(..) =&gt; <span class="string">&quot;Disconnected(..)&quot;</span>.fmt(f),
}
}
}
<span class="kw">impl</span>&lt;T&gt; fmt::Display <span class="kw">for </span>TrySendError&lt;T&gt; {
<span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>fmt::Formatter&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; fmt::Result {
<span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{
TrySendError::Full(..) =&gt; <span class="string">&quot;sending on a full channel&quot;</span>.fmt(f),
TrySendError::Disconnected(..) =&gt; <span class="string">&quot;sending on a disconnected channel&quot;</span>.fmt(f),
}
}
}
<span class="kw">impl</span>&lt;T: Send&gt; error::Error <span class="kw">for </span>TrySendError&lt;T&gt; {}
<span class="kw">impl</span>&lt;T&gt; From&lt;SendError&lt;T&gt;&gt; <span class="kw">for </span>TrySendError&lt;T&gt; {
<span class="kw">fn </span>from(err: SendError&lt;T&gt;) -&gt; TrySendError&lt;T&gt; {
<span class="kw">match </span>err {
SendError(t) =&gt; TrySendError::Disconnected(t),
}
}
}
<span class="kw">impl</span>&lt;T&gt; TrySendError&lt;T&gt; {
<span class="doccomment">/// Unwraps the message.
///
/// # Examples
///
/// ```
/// use crossbeam_channel::bounded;
///
/// let (s, r) = bounded(0);
///
/// if let Err(err) = s.try_send(&quot;foo&quot;) {
/// assert_eq!(err.into_inner(), &quot;foo&quot;);
/// }
/// ```
</span><span class="kw">pub fn </span>into_inner(<span class="self">self</span>) -&gt; T {
<span class="kw">match </span><span class="self">self </span>{
TrySendError::Full(v) =&gt; v,
TrySendError::Disconnected(v) =&gt; v,
}
}
<span class="doccomment">/// Returns `true` if the send operation failed because the channel is full.
</span><span class="kw">pub fn </span>is_full(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; bool {
<span class="kw">match </span><span class="self">self </span>{
TrySendError::Full(<span class="kw">_</span>) =&gt; <span class="bool-val">true</span>,
<span class="kw">_ </span>=&gt; <span class="bool-val">false</span>,
}
}
<span class="doccomment">/// Returns `true` if the send operation failed because the channel is disconnected.
</span><span class="kw">pub fn </span>is_disconnected(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; bool {
<span class="kw">match </span><span class="self">self </span>{
TrySendError::Disconnected(<span class="kw">_</span>) =&gt; <span class="bool-val">true</span>,
<span class="kw">_ </span>=&gt; <span class="bool-val">false</span>,
}
}
}
<span class="kw">impl</span>&lt;T&gt; fmt::Debug <span class="kw">for </span>SendTimeoutError&lt;T&gt; {
<span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>fmt::Formatter&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; fmt::Result {
<span class="string">&quot;SendTimeoutError(..)&quot;</span>.fmt(f)
}
}
<span class="kw">impl</span>&lt;T&gt; fmt::Display <span class="kw">for </span>SendTimeoutError&lt;T&gt; {
<span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>fmt::Formatter&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; fmt::Result {
<span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{
SendTimeoutError::Timeout(..) =&gt; <span class="string">&quot;timed out waiting on send operation&quot;</span>.fmt(f),
SendTimeoutError::Disconnected(..) =&gt; <span class="string">&quot;sending on a disconnected channel&quot;</span>.fmt(f),
}
}
}
<span class="kw">impl</span>&lt;T: Send&gt; error::Error <span class="kw">for </span>SendTimeoutError&lt;T&gt; {}
<span class="kw">impl</span>&lt;T&gt; From&lt;SendError&lt;T&gt;&gt; <span class="kw">for </span>SendTimeoutError&lt;T&gt; {
<span class="kw">fn </span>from(err: SendError&lt;T&gt;) -&gt; SendTimeoutError&lt;T&gt; {
<span class="kw">match </span>err {
SendError(e) =&gt; SendTimeoutError::Disconnected(e),
}
}
}
<span class="kw">impl</span>&lt;T&gt; SendTimeoutError&lt;T&gt; {
<span class="doccomment">/// Unwraps the message.
///
/// # Examples
///
/// ```
/// use std::time::Duration;
/// use crossbeam_channel::unbounded;
///
/// let (s, r) = unbounded();
///
/// if let Err(err) = s.send_timeout(&quot;foo&quot;, Duration::from_secs(1)) {
/// assert_eq!(err.into_inner(), &quot;foo&quot;);
/// }
/// ```
</span><span class="kw">pub fn </span>into_inner(<span class="self">self</span>) -&gt; T {
<span class="kw">match </span><span class="self">self </span>{
SendTimeoutError::Timeout(v) =&gt; v,
SendTimeoutError::Disconnected(v) =&gt; v,
}
}
<span class="doccomment">/// Returns `true` if the send operation timed out.
</span><span class="kw">pub fn </span>is_timeout(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; bool {
<span class="kw">match </span><span class="self">self </span>{
SendTimeoutError::Timeout(<span class="kw">_</span>) =&gt; <span class="bool-val">true</span>,
<span class="kw">_ </span>=&gt; <span class="bool-val">false</span>,
}
}
<span class="doccomment">/// Returns `true` if the send operation failed because the channel is disconnected.
</span><span class="kw">pub fn </span>is_disconnected(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; bool {
<span class="kw">match </span><span class="self">self </span>{
SendTimeoutError::Disconnected(<span class="kw">_</span>) =&gt; <span class="bool-val">true</span>,
<span class="kw">_ </span>=&gt; <span class="bool-val">false</span>,
}
}
}
<span class="kw">impl </span>fmt::Display <span class="kw">for </span>RecvError {
<span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>fmt::Formatter&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; fmt::Result {
<span class="string">&quot;receiving on an empty and disconnected channel&quot;</span>.fmt(f)
}
}
<span class="kw">impl </span>error::Error <span class="kw">for </span>RecvError {}
<span class="kw">impl </span>fmt::Display <span class="kw">for </span>TryRecvError {
<span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>fmt::Formatter&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; fmt::Result {
<span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{
TryRecvError::Empty =&gt; <span class="string">&quot;receiving on an empty channel&quot;</span>.fmt(f),
TryRecvError::Disconnected =&gt; <span class="string">&quot;receiving on an empty and disconnected channel&quot;</span>.fmt(f),
}
}
}
<span class="kw">impl </span>error::Error <span class="kw">for </span>TryRecvError {}
<span class="kw">impl </span>From&lt;RecvError&gt; <span class="kw">for </span>TryRecvError {
<span class="kw">fn </span>from(err: RecvError) -&gt; TryRecvError {
<span class="kw">match </span>err {
RecvError =&gt; TryRecvError::Disconnected,
}
}
}
<span class="kw">impl </span>TryRecvError {
<span class="doccomment">/// Returns `true` if the receive operation failed because the channel is empty.
</span><span class="kw">pub fn </span>is_empty(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; bool {
<span class="kw">match </span><span class="self">self </span>{
TryRecvError::Empty =&gt; <span class="bool-val">true</span>,
<span class="kw">_ </span>=&gt; <span class="bool-val">false</span>,
}
}
<span class="doccomment">/// Returns `true` if the receive operation failed because the channel is disconnected.
</span><span class="kw">pub fn </span>is_disconnected(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; bool {
<span class="kw">match </span><span class="self">self </span>{
TryRecvError::Disconnected =&gt; <span class="bool-val">true</span>,
<span class="kw">_ </span>=&gt; <span class="bool-val">false</span>,
}
}
}
<span class="kw">impl </span>fmt::Display <span class="kw">for </span>RecvTimeoutError {
<span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>fmt::Formatter&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; fmt::Result {
<span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{
RecvTimeoutError::Timeout =&gt; <span class="string">&quot;timed out waiting on receive operation&quot;</span>.fmt(f),
RecvTimeoutError::Disconnected =&gt; <span class="string">&quot;channel is empty and disconnected&quot;</span>.fmt(f),
}
}
}
<span class="kw">impl </span>error::Error <span class="kw">for </span>RecvTimeoutError {}
<span class="kw">impl </span>From&lt;RecvError&gt; <span class="kw">for </span>RecvTimeoutError {
<span class="kw">fn </span>from(err: RecvError) -&gt; RecvTimeoutError {
<span class="kw">match </span>err {
RecvError =&gt; RecvTimeoutError::Disconnected,
}
}
}
<span class="kw">impl </span>RecvTimeoutError {
<span class="doccomment">/// Returns `true` if the receive operation timed out.
</span><span class="kw">pub fn </span>is_timeout(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; bool {
<span class="kw">match </span><span class="self">self </span>{
RecvTimeoutError::Timeout =&gt; <span class="bool-val">true</span>,
<span class="kw">_ </span>=&gt; <span class="bool-val">false</span>,
}
}
<span class="doccomment">/// Returns `true` if the receive operation failed because the channel is disconnected.
</span><span class="kw">pub fn </span>is_disconnected(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; bool {
<span class="kw">match </span><span class="self">self </span>{
RecvTimeoutError::Disconnected =&gt; <span class="bool-val">true</span>,
<span class="kw">_ </span>=&gt; <span class="bool-val">false</span>,
}
}
}
<span class="kw">impl </span>fmt::Display <span class="kw">for </span>TrySelectError {
<span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>fmt::Formatter&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; fmt::Result {
<span class="string">&quot;all operations in select would block&quot;</span>.fmt(f)
}
}
<span class="kw">impl </span>error::Error <span class="kw">for </span>TrySelectError {}
<span class="kw">impl </span>fmt::Display <span class="kw">for </span>SelectTimeoutError {
<span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>fmt::Formatter&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; fmt::Result {
<span class="string">&quot;timed out waiting on select&quot;</span>.fmt(f)
}
}
<span class="kw">impl </span>error::Error <span class="kw">for </span>SelectTimeoutError {}
</code></pre></div>
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