| <!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/futures-sink-0.3.28/src/lib.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>lib.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="../../futures_sink/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="../../futures_sink/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="doccomment">//! Asynchronous sinks |
| //! |
| //! This crate contains the `Sink` trait which allows values to be sent |
| //! asynchronously. |
| |
| </span><span class="attribute">#![cfg_attr(not(feature = <span class="string">"std"</span>), no_std)] |
| #![warn(missing_debug_implementations, missing_docs, rust_2018_idioms, unreachable_pub)] |
| </span><span class="comment">// It cannot be included in the published code because this lints have false positives in the minimum required version. |
| </span><span class="attribute">#![cfg_attr(test, warn(single_use_lifetimes))] |
| #![doc(test( |
| no_crate_inject, |
| attr( |
| deny(warnings, rust_2018_idioms, single_use_lifetimes), |
| allow(dead_code, unused_assignments, unused_variables) |
| ) |
| ))] |
| |
| #[cfg(feature = <span class="string">"alloc"</span>)] |
| </span><span class="kw">extern crate </span>alloc; |
| |
| <span class="kw">use </span>core::ops::DerefMut; |
| <span class="kw">use </span>core::pin::Pin; |
| <span class="kw">use </span>core::task::{Context, Poll}; |
| |
| <span class="doccomment">/// A `Sink` is a value into which other values can be sent, asynchronously. |
| /// |
| /// Basic examples of sinks include the sending side of: |
| /// |
| /// - Channels |
| /// - Sockets |
| /// - Pipes |
| /// |
| /// In addition to such "primitive" sinks, it's typical to layer additional |
| /// functionality, such as buffering, on top of an existing sink. |
| /// |
| /// Sending to a sink is "asynchronous" in the sense that the value may not be |
| /// sent in its entirety immediately. Instead, values are sent in a two-phase |
| /// way: first by initiating a send, and then by polling for completion. This |
| /// two-phase setup is analogous to buffered writing in synchronous code, where |
| /// writes often succeed immediately, but internally are buffered and are |
| /// *actually* written only upon flushing. |
| /// |
| /// In addition, the `Sink` may be *full*, in which case it is not even possible |
| /// to start the sending process. |
| /// |
| /// As with `Future` and `Stream`, the `Sink` trait is built from a few core |
| /// required methods, and a host of default methods for working in a |
| /// higher-level way. The `Sink::send_all` combinator is of particular |
| /// importance: you can use it to send an entire stream to a sink, which is |
| /// the simplest way to ultimately consume a stream. |
| </span><span class="attribute">#[must_use = <span class="string">"sinks do nothing unless polled"</span>] |
| </span><span class="kw">pub trait </span>Sink<Item> { |
| <span class="doccomment">/// The type of value produced by the sink when an error occurs. |
| </span><span class="kw">type </span>Error; |
| |
| <span class="doccomment">/// Attempts to prepare the `Sink` to receive a value. |
| /// |
| /// This method must be called and return `Poll::Ready(Ok(()))` prior to |
| /// each call to `start_send`. |
| /// |
| /// This method returns `Poll::Ready` once the underlying sink is ready to |
| /// receive data. If this method returns `Poll::Pending`, the current task |
| /// is registered to be notified (via `cx.waker().wake_by_ref()`) when `poll_ready` |
| /// should be called again. |
| /// |
| /// In most cases, if the sink encounters an error, the sink will |
| /// permanently be unable to receive items. |
| </span><span class="kw">fn </span>poll_ready(<span class="self">self</span>: Pin<<span class="kw-2">&mut </span><span class="self">Self</span>>, cx: <span class="kw-2">&mut </span>Context<<span class="lifetime">'_</span>>) -> Poll<<span class="prelude-ty">Result</span><(), <span class="self">Self</span>::Error>>; |
| |
| <span class="doccomment">/// Begin the process of sending a value to the sink. |
| /// Each call to this function must be preceded by a successful call to |
| /// `poll_ready` which returned `Poll::Ready(Ok(()))`. |
| /// |
| /// As the name suggests, this method only *begins* the process of sending |
| /// the item. If the sink employs buffering, the item isn't fully processed |
| /// until the buffer is fully flushed. Since sinks are designed to work with |
| /// asynchronous I/O, the process of actually writing out the data to an |
| /// underlying object takes place asynchronously. **You *must* use |
| /// `poll_flush` or `poll_close` in order to guarantee completion of a |
| /// send**. |
| /// |
| /// Implementations of `poll_ready` and `start_send` will usually involve |
| /// flushing behind the scenes in order to make room for new messages. |
| /// It is only necessary to call `poll_flush` if you need to guarantee that |
| /// *all* of the items placed into the `Sink` have been sent. |
| /// |
| /// In most cases, if the sink encounters an error, the sink will |
| /// permanently be unable to receive items. |
| </span><span class="kw">fn </span>start_send(<span class="self">self</span>: Pin<<span class="kw-2">&mut </span><span class="self">Self</span>>, item: Item) -> <span class="prelude-ty">Result</span><(), <span class="self">Self</span>::Error>; |
| |
| <span class="doccomment">/// Flush any remaining output from this sink. |
| /// |
| /// Returns `Poll::Ready(Ok(()))` when no buffered items remain. If this |
| /// value is returned then it is guaranteed that all previous values sent |
| /// via `start_send` have been flushed. |
| /// |
| /// Returns `Poll::Pending` if there is more work left to do, in which |
| /// case the current task is scheduled (via `cx.waker().wake_by_ref()`) to wake up when |
| /// `poll_flush` should be called again. |
| /// |
| /// In most cases, if the sink encounters an error, the sink will |
| /// permanently be unable to receive items. |
| </span><span class="kw">fn </span>poll_flush(<span class="self">self</span>: Pin<<span class="kw-2">&mut </span><span class="self">Self</span>>, cx: <span class="kw-2">&mut </span>Context<<span class="lifetime">'_</span>>) -> Poll<<span class="prelude-ty">Result</span><(), <span class="self">Self</span>::Error>>; |
| |
| <span class="doccomment">/// Flush any remaining output and close this sink, if necessary. |
| /// |
| /// Returns `Poll::Ready(Ok(()))` when no buffered items remain and the sink |
| /// has been successfully closed. |
| /// |
| /// Returns `Poll::Pending` if there is more work left to do, in which |
| /// case the current task is scheduled (via `cx.waker().wake_by_ref()`) to wake up when |
| /// `poll_close` should be called again. |
| /// |
| /// If this function encounters an error, the sink should be considered to |
| /// have failed permanently, and no more `Sink` methods should be called. |
| </span><span class="kw">fn </span>poll_close(<span class="self">self</span>: Pin<<span class="kw-2">&mut </span><span class="self">Self</span>>, cx: <span class="kw-2">&mut </span>Context<<span class="lifetime">'_</span>>) -> Poll<<span class="prelude-ty">Result</span><(), <span class="self">Self</span>::Error>>; |
| } |
| |
| <span class="kw">impl</span><S: <span class="question-mark">?</span>Sized + Sink<Item> + Unpin, Item> Sink<Item> <span class="kw">for </span><span class="kw-2">&mut </span>S { |
| <span class="kw">type </span>Error = S::Error; |
| |
| <span class="kw">fn </span>poll_ready(<span class="kw-2">mut </span><span class="self">self</span>: Pin<<span class="kw-2">&mut </span><span class="self">Self</span>>, cx: <span class="kw-2">&mut </span>Context<<span class="lifetime">'_</span>>) -> Poll<<span class="prelude-ty">Result</span><(), <span class="self">Self</span>::Error>> { |
| Pin::new(<span class="kw-2">&mut **</span><span class="self">self</span>).poll_ready(cx) |
| } |
| |
| <span class="kw">fn </span>start_send(<span class="kw-2">mut </span><span class="self">self</span>: Pin<<span class="kw-2">&mut </span><span class="self">Self</span>>, item: Item) -> <span class="prelude-ty">Result</span><(), <span class="self">Self</span>::Error> { |
| Pin::new(<span class="kw-2">&mut **</span><span class="self">self</span>).start_send(item) |
| } |
| |
| <span class="kw">fn </span>poll_flush(<span class="kw-2">mut </span><span class="self">self</span>: Pin<<span class="kw-2">&mut </span><span class="self">Self</span>>, cx: <span class="kw-2">&mut </span>Context<<span class="lifetime">'_</span>>) -> Poll<<span class="prelude-ty">Result</span><(), <span class="self">Self</span>::Error>> { |
| Pin::new(<span class="kw-2">&mut **</span><span class="self">self</span>).poll_flush(cx) |
| } |
| |
| <span class="kw">fn </span>poll_close(<span class="kw-2">mut </span><span class="self">self</span>: Pin<<span class="kw-2">&mut </span><span class="self">Self</span>>, cx: <span class="kw-2">&mut </span>Context<<span class="lifetime">'_</span>>) -> Poll<<span class="prelude-ty">Result</span><(), <span class="self">Self</span>::Error>> { |
| Pin::new(<span class="kw-2">&mut **</span><span class="self">self</span>).poll_close(cx) |
| } |
| } |
| |
| <span class="kw">impl</span><P, Item> Sink<Item> <span class="kw">for </span>Pin<P> |
| <span class="kw">where |
| </span>P: DerefMut + Unpin, |
| P::Target: Sink<Item>, |
| { |
| <span class="kw">type </span>Error = <P::Target <span class="kw">as </span>Sink<Item>>::Error; |
| |
| <span class="kw">fn </span>poll_ready(<span class="self">self</span>: Pin<<span class="kw-2">&mut </span><span class="self">Self</span>>, cx: <span class="kw-2">&mut </span>Context<<span class="lifetime">'_</span>>) -> Poll<<span class="prelude-ty">Result</span><(), <span class="self">Self</span>::Error>> { |
| <span class="self">self</span>.get_mut().as_mut().poll_ready(cx) |
| } |
| |
| <span class="kw">fn </span>start_send(<span class="self">self</span>: Pin<<span class="kw-2">&mut </span><span class="self">Self</span>>, item: Item) -> <span class="prelude-ty">Result</span><(), <span class="self">Self</span>::Error> { |
| <span class="self">self</span>.get_mut().as_mut().start_send(item) |
| } |
| |
| <span class="kw">fn </span>poll_flush(<span class="self">self</span>: Pin<<span class="kw-2">&mut </span><span class="self">Self</span>>, cx: <span class="kw-2">&mut </span>Context<<span class="lifetime">'_</span>>) -> Poll<<span class="prelude-ty">Result</span><(), <span class="self">Self</span>::Error>> { |
| <span class="self">self</span>.get_mut().as_mut().poll_flush(cx) |
| } |
| |
| <span class="kw">fn </span>poll_close(<span class="self">self</span>: Pin<<span class="kw-2">&mut </span><span class="self">Self</span>>, cx: <span class="kw-2">&mut </span>Context<<span class="lifetime">'_</span>>) -> Poll<<span class="prelude-ty">Result</span><(), <span class="self">Self</span>::Error>> { |
| <span class="self">self</span>.get_mut().as_mut().poll_close(cx) |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"alloc"</span>)] |
| </span><span class="kw">mod </span>if_alloc { |
| <span class="kw">use super</span>::<span class="kw-2">*</span>; |
| <span class="kw">use </span>core::convert::Infallible <span class="kw">as </span>Never; |
| |
| <span class="kw">impl</span><T> Sink<T> <span class="kw">for </span>alloc::vec::Vec<T> { |
| <span class="kw">type </span>Error = Never; |
| |
| <span class="kw">fn </span>poll_ready(<span class="self">self</span>: Pin<<span class="kw-2">&mut </span><span class="self">Self</span>>, <span class="kw">_</span>: <span class="kw-2">&mut </span>Context<<span class="lifetime">'_</span>>) -> Poll<<span class="prelude-ty">Result</span><(), <span class="self">Self</span>::Error>> { |
| Poll::Ready(<span class="prelude-val">Ok</span>(())) |
| } |
| |
| <span class="kw">fn </span>start_send(<span class="self">self</span>: Pin<<span class="kw-2">&mut </span><span class="self">Self</span>>, item: T) -> <span class="prelude-ty">Result</span><(), <span class="self">Self</span>::Error> { |
| <span class="comment">// TODO: impl<T> Unpin for Vec<T> {} |
| </span><span class="kw">unsafe </span>{ <span class="self">self</span>.get_unchecked_mut() }.push(item); |
| <span class="prelude-val">Ok</span>(()) |
| } |
| |
| <span class="kw">fn </span>poll_flush(<span class="self">self</span>: Pin<<span class="kw-2">&mut </span><span class="self">Self</span>>, <span class="kw">_</span>: <span class="kw-2">&mut </span>Context<<span class="lifetime">'_</span>>) -> Poll<<span class="prelude-ty">Result</span><(), <span class="self">Self</span>::Error>> { |
| Poll::Ready(<span class="prelude-val">Ok</span>(())) |
| } |
| |
| <span class="kw">fn </span>poll_close(<span class="self">self</span>: Pin<<span class="kw-2">&mut </span><span class="self">Self</span>>, <span class="kw">_</span>: <span class="kw-2">&mut </span>Context<<span class="lifetime">'_</span>>) -> Poll<<span class="prelude-ty">Result</span><(), <span class="self">Self</span>::Error>> { |
| Poll::Ready(<span class="prelude-val">Ok</span>(())) |
| } |
| } |
| |
| <span class="kw">impl</span><T> Sink<T> <span class="kw">for </span>alloc::collections::VecDeque<T> { |
| <span class="kw">type </span>Error = Never; |
| |
| <span class="kw">fn </span>poll_ready(<span class="self">self</span>: Pin<<span class="kw-2">&mut </span><span class="self">Self</span>>, <span class="kw">_</span>: <span class="kw-2">&mut </span>Context<<span class="lifetime">'_</span>>) -> Poll<<span class="prelude-ty">Result</span><(), <span class="self">Self</span>::Error>> { |
| Poll::Ready(<span class="prelude-val">Ok</span>(())) |
| } |
| |
| <span class="kw">fn </span>start_send(<span class="self">self</span>: Pin<<span class="kw-2">&mut </span><span class="self">Self</span>>, item: T) -> <span class="prelude-ty">Result</span><(), <span class="self">Self</span>::Error> { |
| <span class="comment">// TODO: impl<T> Unpin for Vec<T> {} |
| </span><span class="kw">unsafe </span>{ <span class="self">self</span>.get_unchecked_mut() }.push_back(item); |
| <span class="prelude-val">Ok</span>(()) |
| } |
| |
| <span class="kw">fn </span>poll_flush(<span class="self">self</span>: Pin<<span class="kw-2">&mut </span><span class="self">Self</span>>, <span class="kw">_</span>: <span class="kw-2">&mut </span>Context<<span class="lifetime">'_</span>>) -> Poll<<span class="prelude-ty">Result</span><(), <span class="self">Self</span>::Error>> { |
| Poll::Ready(<span class="prelude-val">Ok</span>(())) |
| } |
| |
| <span class="kw">fn </span>poll_close(<span class="self">self</span>: Pin<<span class="kw-2">&mut </span><span class="self">Self</span>>, <span class="kw">_</span>: <span class="kw-2">&mut </span>Context<<span class="lifetime">'_</span>>) -> Poll<<span class="prelude-ty">Result</span><(), <span class="self">Self</span>::Error>> { |
| Poll::Ready(<span class="prelude-val">Ok</span>(())) |
| } |
| } |
| |
| <span class="kw">impl</span><S: <span class="question-mark">?</span>Sized + Sink<Item> + Unpin, Item> Sink<Item> <span class="kw">for </span>alloc::boxed::Box<S> { |
| <span class="kw">type </span>Error = S::Error; |
| |
| <span class="kw">fn </span>poll_ready( |
| <span class="kw-2">mut </span><span class="self">self</span>: Pin<<span class="kw-2">&mut </span><span class="self">Self</span>>, |
| cx: <span class="kw-2">&mut </span>Context<<span class="lifetime">'_</span>>, |
| ) -> Poll<<span class="prelude-ty">Result</span><(), <span class="self">Self</span>::Error>> { |
| Pin::new(<span class="kw-2">&mut **</span><span class="self">self</span>).poll_ready(cx) |
| } |
| |
| <span class="kw">fn </span>start_send(<span class="kw-2">mut </span><span class="self">self</span>: Pin<<span class="kw-2">&mut </span><span class="self">Self</span>>, item: Item) -> <span class="prelude-ty">Result</span><(), <span class="self">Self</span>::Error> { |
| Pin::new(<span class="kw-2">&mut **</span><span class="self">self</span>).start_send(item) |
| } |
| |
| <span class="kw">fn </span>poll_flush( |
| <span class="kw-2">mut </span><span class="self">self</span>: Pin<<span class="kw-2">&mut </span><span class="self">Self</span>>, |
| cx: <span class="kw-2">&mut </span>Context<<span class="lifetime">'_</span>>, |
| ) -> Poll<<span class="prelude-ty">Result</span><(), <span class="self">Self</span>::Error>> { |
| Pin::new(<span class="kw-2">&mut **</span><span class="self">self</span>).poll_flush(cx) |
| } |
| |
| <span class="kw">fn </span>poll_close( |
| <span class="kw-2">mut </span><span class="self">self</span>: Pin<<span class="kw-2">&mut </span><span class="self">Self</span>>, |
| cx: <span class="kw-2">&mut </span>Context<<span class="lifetime">'_</span>>, |
| ) -> Poll<<span class="prelude-ty">Result</span><(), <span class="self">Self</span>::Error>> { |
| Pin::new(<span class="kw-2">&mut **</span><span class="self">self</span>).poll_close(cx) |
| } |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="futures_sink" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
