| <!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-util-0.3.28/src/stream/try_stream/mod.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>mod.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_util/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_util/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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| <span id="1130">1130</span> |
| </pre><pre class="rust"><code><span class="doccomment">//! Streams |
| //! |
| //! This module contains a number of functions for working with `Streams`s |
| //! that return `Result`s, allowing for short-circuiting computations. |
| |
| </span><span class="attribute">#[cfg(feature = <span class="string">"compat"</span>)] |
| </span><span class="kw">use </span><span class="kw">crate</span>::compat::Compat; |
| <span class="kw">use </span><span class="kw">crate</span>::fns::{ |
| inspect_err_fn, inspect_ok_fn, into_fn, map_err_fn, map_ok_fn, InspectErrFn, InspectOkFn, |
| IntoFn, MapErrFn, MapOkFn, |
| }; |
| <span class="kw">use </span><span class="kw">crate</span>::future::assert_future; |
| <span class="kw">use </span><span class="kw">crate</span>::stream::assert_stream; |
| <span class="kw">use </span><span class="kw">crate</span>::stream::{Inspect, Map}; |
| <span class="attribute">#[cfg(feature = <span class="string">"alloc"</span>)] |
| </span><span class="kw">use </span>alloc::vec::Vec; |
| <span class="kw">use </span>core::pin::Pin; |
| |
| <span class="kw">use </span>futures_core::{ |
| future::{Future, TryFuture}, |
| stream::TryStream, |
| task::{Context, Poll}, |
| }; |
| |
| <span class="kw">mod </span>and_then; |
| <span class="attribute">#[allow(unreachable_pub)] </span><span class="comment">// https://github.com/rust-lang/rust/issues/57411 |
| </span><span class="kw">pub use </span><span class="self">self</span>::and_then::AndThen; |
| |
| <span class="macro">delegate_all!</span>( |
| <span class="doccomment">/// Stream for the [`err_into`](super::TryStreamExt::err_into) method. |
| </span>ErrInto<St, E>( |
| MapErr<St, IntoFn<E>> |
| ): Debug + Sink + Stream + FusedStream + AccessInner[St, (.)] + New[|x: St| MapErr::new(x, into_fn())] |
| ); |
| |
| <span class="macro">delegate_all!</span>( |
| <span class="doccomment">/// Stream for the [`inspect_ok`](super::TryStreamExt::inspect_ok) method. |
| </span>InspectOk<St, F>( |
| Inspect<IntoStream<St>, InspectOkFn<F>> |
| ): Debug + Sink + Stream + FusedStream + AccessInner[St, (. .)] + New[|x: St, f: F| Inspect::new(IntoStream::new(x), inspect_ok_fn(f))] |
| ); |
| |
| <span class="macro">delegate_all!</span>( |
| <span class="doccomment">/// Stream for the [`inspect_err`](super::TryStreamExt::inspect_err) method. |
| </span>InspectErr<St, F>( |
| Inspect<IntoStream<St>, InspectErrFn<F>> |
| ): Debug + Sink + Stream + FusedStream + AccessInner[St, (. .)] + New[|x: St, f: F| Inspect::new(IntoStream::new(x), inspect_err_fn(f))] |
| ); |
| |
| <span class="kw">mod </span>into_stream; |
| <span class="attribute">#[allow(unreachable_pub)] </span><span class="comment">// https://github.com/rust-lang/rust/issues/57411 |
| </span><span class="kw">pub use </span><span class="self">self</span>::into_stream::IntoStream; |
| |
| <span class="macro">delegate_all!</span>( |
| <span class="doccomment">/// Stream for the [`map_ok`](super::TryStreamExt::map_ok) method. |
| </span>MapOk<St, F>( |
| Map<IntoStream<St>, MapOkFn<F>> |
| ): Debug + Sink + Stream + FusedStream + AccessInner[St, (. .)] + New[|x: St, f: F| Map::new(IntoStream::new(x), map_ok_fn(f))] |
| ); |
| |
| <span class="macro">delegate_all!</span>( |
| <span class="doccomment">/// Stream for the [`map_err`](super::TryStreamExt::map_err) method. |
| </span>MapErr<St, F>( |
| Map<IntoStream<St>, MapErrFn<F>> |
| ): Debug + Sink + Stream + FusedStream + AccessInner[St, (. .)] + New[|x: St, f: F| Map::new(IntoStream::new(x), map_err_fn(f))] |
| ); |
| |
| <span class="kw">mod </span>or_else; |
| <span class="attribute">#[allow(unreachable_pub)] </span><span class="comment">// https://github.com/rust-lang/rust/issues/57411 |
| </span><span class="kw">pub use </span><span class="self">self</span>::or_else::OrElse; |
| |
| <span class="kw">mod </span>try_next; |
| <span class="attribute">#[allow(unreachable_pub)] </span><span class="comment">// https://github.com/rust-lang/rust/issues/57411 |
| </span><span class="kw">pub use </span><span class="self">self</span>::try_next::TryNext; |
| |
| <span class="kw">mod </span>try_for_each; |
| <span class="attribute">#[allow(unreachable_pub)] </span><span class="comment">// https://github.com/rust-lang/rust/issues/57411 |
| </span><span class="kw">pub use </span><span class="self">self</span>::try_for_each::TryForEach; |
| |
| <span class="kw">mod </span>try_filter; |
| <span class="attribute">#[allow(unreachable_pub)] </span><span class="comment">// https://github.com/rust-lang/rust/issues/57411 |
| </span><span class="kw">pub use </span><span class="self">self</span>::try_filter::TryFilter; |
| |
| <span class="kw">mod </span>try_filter_map; |
| <span class="attribute">#[allow(unreachable_pub)] </span><span class="comment">// https://github.com/rust-lang/rust/issues/57411 |
| </span><span class="kw">pub use </span><span class="self">self</span>::try_filter_map::TryFilterMap; |
| |
| <span class="kw">mod </span>try_flatten; |
| <span class="attribute">#[allow(unreachable_pub)] </span><span class="comment">// https://github.com/rust-lang/rust/issues/57411 |
| </span><span class="kw">pub use </span><span class="self">self</span>::try_flatten::TryFlatten; |
| |
| <span class="attribute">#[cfg(not(futures_no_atomic_cas))] |
| #[cfg(feature = <span class="string">"alloc"</span>)] |
| </span><span class="kw">mod </span>try_flatten_unordered; |
| <span class="attribute">#[cfg(not(futures_no_atomic_cas))] |
| #[cfg(feature = <span class="string">"alloc"</span>)] |
| #[allow(unreachable_pub)] </span><span class="comment">// https://github.com/rust-lang/rust/issues/57411 |
| </span><span class="kw">pub use </span><span class="self">self</span>::try_flatten_unordered::TryFlattenUnordered; |
| |
| <span class="kw">mod </span>try_collect; |
| <span class="attribute">#[allow(unreachable_pub)] </span><span class="comment">// https://github.com/rust-lang/rust/issues/57411 |
| </span><span class="kw">pub use </span><span class="self">self</span>::try_collect::TryCollect; |
| |
| <span class="kw">mod </span>try_concat; |
| <span class="attribute">#[allow(unreachable_pub)] </span><span class="comment">// https://github.com/rust-lang/rust/issues/57411 |
| </span><span class="kw">pub use </span><span class="self">self</span>::try_concat::TryConcat; |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"alloc"</span>)] |
| </span><span class="kw">mod </span>try_chunks; |
| <span class="attribute">#[cfg(feature = <span class="string">"alloc"</span>)] |
| #[allow(unreachable_pub)] </span><span class="comment">// https://github.com/rust-lang/rust/issues/57411 |
| </span><span class="kw">pub use </span><span class="self">self</span>::try_chunks::{TryChunks, TryChunksError}; |
| |
| <span class="kw">mod </span>try_fold; |
| <span class="attribute">#[allow(unreachable_pub)] </span><span class="comment">// https://github.com/rust-lang/rust/issues/57411 |
| </span><span class="kw">pub use </span><span class="self">self</span>::try_fold::TryFold; |
| |
| <span class="kw">mod </span>try_unfold; |
| <span class="attribute">#[allow(unreachable_pub)] </span><span class="comment">// https://github.com/rust-lang/rust/issues/57411 |
| </span><span class="kw">pub use </span><span class="self">self</span>::try_unfold::{try_unfold, TryUnfold}; |
| |
| <span class="kw">mod </span>try_skip_while; |
| <span class="attribute">#[allow(unreachable_pub)] </span><span class="comment">// https://github.com/rust-lang/rust/issues/57411 |
| </span><span class="kw">pub use </span><span class="self">self</span>::try_skip_while::TrySkipWhile; |
| |
| <span class="kw">mod </span>try_take_while; |
| <span class="attribute">#[allow(unreachable_pub)] </span><span class="comment">// https://github.com/rust-lang/rust/issues/57411 |
| </span><span class="kw">pub use </span><span class="self">self</span>::try_take_while::TryTakeWhile; |
| |
| <span class="attribute">#[cfg(not(futures_no_atomic_cas))] |
| #[cfg(feature = <span class="string">"alloc"</span>)] |
| </span><span class="kw">mod </span>try_buffer_unordered; |
| <span class="attribute">#[cfg(not(futures_no_atomic_cas))] |
| #[cfg(feature = <span class="string">"alloc"</span>)] |
| #[allow(unreachable_pub)] </span><span class="comment">// https://github.com/rust-lang/rust/issues/57411 |
| </span><span class="kw">pub use </span><span class="self">self</span>::try_buffer_unordered::TryBufferUnordered; |
| |
| <span class="attribute">#[cfg(not(futures_no_atomic_cas))] |
| #[cfg(feature = <span class="string">"alloc"</span>)] |
| </span><span class="kw">mod </span>try_buffered; |
| <span class="attribute">#[cfg(not(futures_no_atomic_cas))] |
| #[cfg(feature = <span class="string">"alloc"</span>)] |
| #[allow(unreachable_pub)] </span><span class="comment">// https://github.com/rust-lang/rust/issues/57411 |
| </span><span class="kw">pub use </span><span class="self">self</span>::try_buffered::TryBuffered; |
| |
| <span class="attribute">#[cfg(not(futures_no_atomic_cas))] |
| #[cfg(feature = <span class="string">"alloc"</span>)] |
| </span><span class="kw">mod </span>try_for_each_concurrent; |
| <span class="attribute">#[cfg(not(futures_no_atomic_cas))] |
| #[cfg(feature = <span class="string">"alloc"</span>)] |
| #[allow(unreachable_pub)] </span><span class="comment">// https://github.com/rust-lang/rust/issues/57411 |
| </span><span class="kw">pub use </span><span class="self">self</span>::try_for_each_concurrent::TryForEachConcurrent; |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"io"</span>)] |
| #[cfg(feature = <span class="string">"std"</span>)] |
| </span><span class="kw">mod </span>into_async_read; |
| <span class="attribute">#[cfg(feature = <span class="string">"io"</span>)] |
| #[cfg_attr(docsrs, doc(cfg(feature = <span class="string">"io"</span>)))] |
| #[cfg(feature = <span class="string">"std"</span>)] |
| #[allow(unreachable_pub)] </span><span class="comment">// https://github.com/rust-lang/rust/issues/57411 |
| </span><span class="kw">pub use </span><span class="self">self</span>::into_async_read::IntoAsyncRead; |
| |
| <span class="kw">impl</span><S: <span class="question-mark">?</span>Sized + TryStream> TryStreamExt <span class="kw">for </span>S {} |
| |
| <span class="doccomment">/// Adapters specific to `Result`-returning streams |
| </span><span class="kw">pub trait </span>TryStreamExt: TryStream { |
| <span class="doccomment">/// Wraps the current stream in a new stream which converts the error type |
| /// into the one provided. |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// # futures::executor::block_on(async { |
| /// use futures::stream::{self, TryStreamExt}; |
| /// |
| /// let mut stream = |
| /// stream::iter(vec![Ok(()), Err(5i32)]) |
| /// .err_into::<i64>(); |
| /// |
| /// assert_eq!(stream.try_next().await, Ok(Some(()))); |
| /// assert_eq!(stream.try_next().await, Err(5i64)); |
| /// # }) |
| /// ``` |
| </span><span class="kw">fn </span>err_into<E>(<span class="self">self</span>) -> ErrInto<<span class="self">Self</span>, E> |
| <span class="kw">where |
| </span><span class="self">Self</span>: Sized, |
| <span class="self">Self</span>::Error: Into<E>, |
| { |
| assert_stream::<<span class="prelude-ty">Result</span><<span class="self">Self</span>::Ok, E>, <span class="kw">_</span>>(ErrInto::new(<span class="self">self</span>)) |
| } |
| |
| <span class="doccomment">/// Wraps the current stream in a new stream which maps the success value |
| /// using the provided closure. |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// # futures::executor::block_on(async { |
| /// use futures::stream::{self, TryStreamExt}; |
| /// |
| /// let mut stream = |
| /// stream::iter(vec![Ok(5), Err(0)]) |
| /// .map_ok(|x| x + 2); |
| /// |
| /// assert_eq!(stream.try_next().await, Ok(Some(7))); |
| /// assert_eq!(stream.try_next().await, Err(0)); |
| /// # }) |
| /// ``` |
| </span><span class="kw">fn </span>map_ok<T, F>(<span class="self">self</span>, f: F) -> MapOk<<span class="self">Self</span>, F> |
| <span class="kw">where |
| </span><span class="self">Self</span>: Sized, |
| F: FnMut(<span class="self">Self</span>::Ok) -> T, |
| { |
| assert_stream::<<span class="prelude-ty">Result</span><T, <span class="self">Self</span>::Error>, <span class="kw">_</span>>(MapOk::new(<span class="self">self</span>, f)) |
| } |
| |
| <span class="doccomment">/// Wraps the current stream in a new stream which maps the error value |
| /// using the provided closure. |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// # futures::executor::block_on(async { |
| /// use futures::stream::{self, TryStreamExt}; |
| /// |
| /// let mut stream = |
| /// stream::iter(vec![Ok(5), Err(0)]) |
| /// .map_err(|x| x + 2); |
| /// |
| /// assert_eq!(stream.try_next().await, Ok(Some(5))); |
| /// assert_eq!(stream.try_next().await, Err(2)); |
| /// # }) |
| /// ``` |
| </span><span class="kw">fn </span>map_err<E, F>(<span class="self">self</span>, f: F) -> MapErr<<span class="self">Self</span>, F> |
| <span class="kw">where |
| </span><span class="self">Self</span>: Sized, |
| F: FnMut(<span class="self">Self</span>::Error) -> E, |
| { |
| assert_stream::<<span class="prelude-ty">Result</span><<span class="self">Self</span>::Ok, E>, <span class="kw">_</span>>(MapErr::new(<span class="self">self</span>, f)) |
| } |
| |
| <span class="doccomment">/// Chain on a computation for when a value is ready, passing the successful |
| /// results to the provided closure `f`. |
| /// |
| /// This function can be used to run a unit of work when the next successful |
| /// value on a stream is ready. The closure provided will be yielded a value |
| /// when ready, and the returned future will then be run to completion to |
| /// produce the next value on this stream. |
| /// |
| /// Any errors produced by this stream will not be passed to the closure, |
| /// and will be passed through. |
| /// |
| /// The returned value of the closure must implement the `TryFuture` trait |
| /// and can represent some more work to be done before the composed stream |
| /// is finished. |
| /// |
| /// Note that this function consumes the receiving stream and returns a |
| /// wrapped version of it. |
| /// |
| /// To process the entire stream and return a single future representing |
| /// success or error, use `try_for_each` instead. |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// use futures::channel::mpsc; |
| /// use futures::future; |
| /// use futures::stream::TryStreamExt; |
| /// |
| /// let (_tx, rx) = mpsc::channel::<Result<i32, ()>>(1); |
| /// |
| /// let rx = rx.and_then(|result| { |
| /// future::ok(if result % 2 == 0 { |
| /// Some(result) |
| /// } else { |
| /// None |
| /// }) |
| /// }); |
| /// ``` |
| </span><span class="kw">fn </span>and_then<Fut, F>(<span class="self">self</span>, f: F) -> AndThen<<span class="self">Self</span>, Fut, F> |
| <span class="kw">where |
| </span>F: FnMut(<span class="self">Self</span>::Ok) -> Fut, |
| Fut: TryFuture<Error = <span class="self">Self</span>::Error>, |
| <span class="self">Self</span>: Sized, |
| { |
| assert_stream::<<span class="prelude-ty">Result</span><Fut::Ok, Fut::Error>, <span class="kw">_</span>>(AndThen::new(<span class="self">self</span>, f)) |
| } |
| |
| <span class="doccomment">/// Chain on a computation for when an error happens, passing the |
| /// erroneous result to the provided closure `f`. |
| /// |
| /// This function can be used to run a unit of work and attempt to recover from |
| /// an error if one happens. The closure provided will be yielded an error |
| /// when one appears, and the returned future will then be run to completion |
| /// to produce the next value on this stream. |
| /// |
| /// Any successful values produced by this stream will not be passed to the |
| /// closure, and will be passed through. |
| /// |
| /// The returned value of the closure must implement the [`TryFuture`](futures_core::future::TryFuture) trait |
| /// and can represent some more work to be done before the composed stream |
| /// is finished. |
| /// |
| /// Note that this function consumes the receiving stream and returns a |
| /// wrapped version of it. |
| </span><span class="kw">fn </span>or_else<Fut, F>(<span class="self">self</span>, f: F) -> OrElse<<span class="self">Self</span>, Fut, F> |
| <span class="kw">where |
| </span>F: FnMut(<span class="self">Self</span>::Error) -> Fut, |
| Fut: TryFuture<<span class="prelude-val">Ok </span>= <span class="self">Self</span>::Ok>, |
| <span class="self">Self</span>: Sized, |
| { |
| assert_stream::<<span class="prelude-ty">Result</span><<span class="self">Self</span>::Ok, Fut::Error>, <span class="kw">_</span>>(OrElse::new(<span class="self">self</span>, f)) |
| } |
| |
| <span class="doccomment">/// Do something with the success value of this stream, afterwards passing |
| /// it on. |
| /// |
| /// This is similar to the `StreamExt::inspect` method where it allows |
| /// easily inspecting the success value as it passes through the stream, for |
| /// example to debug what's going on. |
| </span><span class="kw">fn </span>inspect_ok<F>(<span class="self">self</span>, f: F) -> InspectOk<<span class="self">Self</span>, F> |
| <span class="kw">where |
| </span>F: FnMut(<span class="kw-2">&</span><span class="self">Self</span>::Ok), |
| <span class="self">Self</span>: Sized, |
| { |
| assert_stream::<<span class="prelude-ty">Result</span><<span class="self">Self</span>::Ok, <span class="self">Self</span>::Error>, <span class="kw">_</span>>(InspectOk::new(<span class="self">self</span>, f)) |
| } |
| |
| <span class="doccomment">/// Do something with the error value of this stream, afterwards passing it on. |
| /// |
| /// This is similar to the `StreamExt::inspect` method where it allows |
| /// easily inspecting the error value as it passes through the stream, for |
| /// example to debug what's going on. |
| </span><span class="kw">fn </span>inspect_err<F>(<span class="self">self</span>, f: F) -> InspectErr<<span class="self">Self</span>, F> |
| <span class="kw">where |
| </span>F: FnMut(<span class="kw-2">&</span><span class="self">Self</span>::Error), |
| <span class="self">Self</span>: Sized, |
| { |
| assert_stream::<<span class="prelude-ty">Result</span><<span class="self">Self</span>::Ok, <span class="self">Self</span>::Error>, <span class="kw">_</span>>(InspectErr::new(<span class="self">self</span>, f)) |
| } |
| |
| <span class="doccomment">/// Wraps a [`TryStream`] into a type that implements |
| /// [`Stream`](futures_core::stream::Stream) |
| /// |
| /// [`TryStream`]s currently do not implement the |
| /// [`Stream`](futures_core::stream::Stream) trait because of limitations |
| /// of the compiler. |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// use futures::stream::{Stream, TryStream, TryStreamExt}; |
| /// |
| /// # type T = i32; |
| /// # type E = (); |
| /// fn make_try_stream() -> impl TryStream<Ok = T, Error = E> { // ... } |
| /// # futures::stream::empty() |
| /// # } |
| /// fn take_stream(stream: impl Stream<Item = Result<T, E>>) { /* ... */ } |
| /// |
| /// take_stream(make_try_stream().into_stream()); |
| /// ``` |
| </span><span class="kw">fn </span>into_stream(<span class="self">self</span>) -> IntoStream<<span class="self">Self</span>> |
| <span class="kw">where |
| </span><span class="self">Self</span>: Sized, |
| { |
| assert_stream::<<span class="prelude-ty">Result</span><<span class="self">Self</span>::Ok, <span class="self">Self</span>::Error>, <span class="kw">_</span>>(IntoStream::new(<span class="self">self</span>)) |
| } |
| |
| <span class="doccomment">/// Creates a future that attempts to resolve the next item in the stream. |
| /// If an error is encountered before the next item, the error is returned |
| /// instead. |
| /// |
| /// This is similar to the `Stream::next` combinator, but returns a |
| /// `Result<Option<T>, E>` rather than an `Option<Result<T, E>>`, making |
| /// for easy use with the `?` operator. |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// # futures::executor::block_on(async { |
| /// use futures::stream::{self, TryStreamExt}; |
| /// |
| /// let mut stream = stream::iter(vec![Ok(()), Err(())]); |
| /// |
| /// assert_eq!(stream.try_next().await, Ok(Some(()))); |
| /// assert_eq!(stream.try_next().await, Err(())); |
| /// # }) |
| /// ``` |
| </span><span class="kw">fn </span>try_next(<span class="kw-2">&mut </span><span class="self">self</span>) -> TryNext<<span class="lifetime">'_</span>, <span class="self">Self</span>> |
| <span class="kw">where |
| </span><span class="self">Self</span>: Unpin, |
| { |
| assert_future::<<span class="prelude-ty">Result</span><<span class="prelude-ty">Option</span><<span class="self">Self</span>::Ok>, <span class="self">Self</span>::Error>, <span class="kw">_</span>>(TryNext::new(<span class="self">self</span>)) |
| } |
| |
| <span class="doccomment">/// Attempts to run this stream to completion, executing the provided |
| /// asynchronous closure for each element on the stream. |
| /// |
| /// The provided closure will be called for each item this stream produces, |
| /// yielding a future. That future will then be executed to completion |
| /// before moving on to the next item. |
| /// |
| /// The returned value is a [`Future`](futures_core::future::Future) where the |
| /// [`Output`](futures_core::future::Future::Output) type is |
| /// `Result<(), Self::Error>`. If any of the intermediate |
| /// futures or the stream returns an error, this future will return |
| /// immediately with an error. |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// # futures::executor::block_on(async { |
| /// use futures::future; |
| /// use futures::stream::{self, TryStreamExt}; |
| /// |
| /// let mut x = 0i32; |
| /// |
| /// { |
| /// let fut = stream::repeat(Ok(1)).try_for_each(|item| { |
| /// x += item; |
| /// future::ready(if x == 3 { Err(()) } else { Ok(()) }) |
| /// }); |
| /// assert_eq!(fut.await, Err(())); |
| /// } |
| /// |
| /// assert_eq!(x, 3); |
| /// # }) |
| /// ``` |
| </span><span class="kw">fn </span>try_for_each<Fut, F>(<span class="self">self</span>, f: F) -> TryForEach<<span class="self">Self</span>, Fut, F> |
| <span class="kw">where |
| </span>F: FnMut(<span class="self">Self</span>::Ok) -> Fut, |
| Fut: TryFuture<<span class="prelude-val">Ok </span>= (), Error = <span class="self">Self</span>::Error>, |
| <span class="self">Self</span>: Sized, |
| { |
| assert_future::<<span class="prelude-ty">Result</span><(), <span class="self">Self</span>::Error>, <span class="kw">_</span>>(TryForEach::new(<span class="self">self</span>, f)) |
| } |
| |
| <span class="doccomment">/// Skip elements on this stream while the provided asynchronous predicate |
| /// resolves to `true`. |
| /// |
| /// This function is similar to |
| /// [`StreamExt::skip_while`](crate::stream::StreamExt::skip_while) but exits |
| /// early if an error occurs. |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// # futures::executor::block_on(async { |
| /// use futures::future; |
| /// use futures::stream::{self, TryStreamExt}; |
| /// |
| /// let stream = stream::iter(vec![Ok::<i32, i32>(1), Ok(3), Ok(2)]); |
| /// let stream = stream.try_skip_while(|x| future::ready(Ok(*x < 3))); |
| /// |
| /// let output: Result<Vec<i32>, i32> = stream.try_collect().await; |
| /// assert_eq!(output, Ok(vec![3, 2])); |
| /// # }) |
| /// ``` |
| </span><span class="kw">fn </span>try_skip_while<Fut, F>(<span class="self">self</span>, f: F) -> TrySkipWhile<<span class="self">Self</span>, Fut, F> |
| <span class="kw">where |
| </span>F: FnMut(<span class="kw-2">&</span><span class="self">Self</span>::Ok) -> Fut, |
| Fut: TryFuture<<span class="prelude-val">Ok </span>= bool, Error = <span class="self">Self</span>::Error>, |
| <span class="self">Self</span>: Sized, |
| { |
| assert_stream::<<span class="prelude-ty">Result</span><<span class="self">Self</span>::Ok, <span class="self">Self</span>::Error>, <span class="kw">_</span>>(TrySkipWhile::new(<span class="self">self</span>, f)) |
| } |
| |
| <span class="doccomment">/// Take elements on this stream while the provided asynchronous predicate |
| /// resolves to `true`. |
| /// |
| /// This function is similar to |
| /// [`StreamExt::take_while`](crate::stream::StreamExt::take_while) but exits |
| /// early if an error occurs. |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// # futures::executor::block_on(async { |
| /// use futures::future; |
| /// use futures::stream::{self, TryStreamExt}; |
| /// |
| /// let stream = stream::iter(vec![Ok::<i32, i32>(1), Ok(2), Ok(3), Ok(2)]); |
| /// let stream = stream.try_take_while(|x| future::ready(Ok(*x < 3))); |
| /// |
| /// let output: Result<Vec<i32>, i32> = stream.try_collect().await; |
| /// assert_eq!(output, Ok(vec![1, 2])); |
| /// # }) |
| /// ``` |
| </span><span class="kw">fn </span>try_take_while<Fut, F>(<span class="self">self</span>, f: F) -> TryTakeWhile<<span class="self">Self</span>, Fut, F> |
| <span class="kw">where |
| </span>F: FnMut(<span class="kw-2">&</span><span class="self">Self</span>::Ok) -> Fut, |
| Fut: TryFuture<<span class="prelude-val">Ok </span>= bool, Error = <span class="self">Self</span>::Error>, |
| <span class="self">Self</span>: Sized, |
| { |
| assert_stream::<<span class="prelude-ty">Result</span><<span class="self">Self</span>::Ok, <span class="self">Self</span>::Error>, <span class="kw">_</span>>(TryTakeWhile::new(<span class="self">self</span>, f)) |
| } |
| |
| <span class="doccomment">/// Attempts to run this stream to completion, executing the provided asynchronous |
| /// closure for each element on the stream concurrently as elements become |
| /// available, exiting as soon as an error occurs. |
| /// |
| /// This is similar to |
| /// [`StreamExt::for_each_concurrent`](crate::stream::StreamExt::for_each_concurrent), |
| /// but will resolve to an error immediately if the underlying stream or the provided |
| /// closure return an error. |
| /// |
| /// This method is only available when the `std` or `alloc` feature of this |
| /// library is activated, and it is activated by default. |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// # futures::executor::block_on(async { |
| /// use futures::channel::oneshot; |
| /// use futures::stream::{self, StreamExt, TryStreamExt}; |
| /// |
| /// let (tx1, rx1) = oneshot::channel(); |
| /// let (tx2, rx2) = oneshot::channel(); |
| /// let (_tx3, rx3) = oneshot::channel(); |
| /// |
| /// let stream = stream::iter(vec![rx1, rx2, rx3]); |
| /// let fut = stream.map(Ok).try_for_each_concurrent( |
| /// /* limit */ 2, |
| /// |rx| async move { |
| /// let res: Result<(), oneshot::Canceled> = rx.await; |
| /// res |
| /// } |
| /// ); |
| /// |
| /// tx1.send(()).unwrap(); |
| /// // Drop the second sender so that `rx2` resolves to `Canceled`. |
| /// drop(tx2); |
| /// |
| /// // The final result is an error because the second future |
| /// // resulted in an error. |
| /// assert_eq!(Err(oneshot::Canceled), fut.await); |
| /// # }) |
| /// ``` |
| </span><span class="attribute">#[cfg(not(futures_no_atomic_cas))] |
| #[cfg(feature = <span class="string">"alloc"</span>)] |
| </span><span class="kw">fn </span>try_for_each_concurrent<Fut, F>( |
| <span class="self">self</span>, |
| limit: <span class="kw">impl </span>Into<<span class="prelude-ty">Option</span><usize>>, |
| f: F, |
| ) -> TryForEachConcurrent<<span class="self">Self</span>, Fut, F> |
| <span class="kw">where |
| </span>F: FnMut(<span class="self">Self</span>::Ok) -> Fut, |
| Fut: Future<Output = <span class="prelude-ty">Result</span><(), <span class="self">Self</span>::Error>>, |
| <span class="self">Self</span>: Sized, |
| { |
| assert_future::<<span class="prelude-ty">Result</span><(), <span class="self">Self</span>::Error>, <span class="kw">_</span>>(TryForEachConcurrent::new( |
| <span class="self">self</span>, |
| limit.into(), |
| f, |
| )) |
| } |
| |
| <span class="doccomment">/// Attempt to transform a stream into a collection, |
| /// returning a future representing the result of that computation. |
| /// |
| /// This combinator will collect all successful results of this stream and |
| /// collect them into the specified collection type. If an error happens then all |
| /// collected elements will be dropped and the error will be returned. |
| /// |
| /// The returned future will be resolved when the stream terminates. |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// # futures::executor::block_on(async { |
| /// use futures::channel::mpsc; |
| /// use futures::stream::TryStreamExt; |
| /// use std::thread; |
| /// |
| /// let (tx, rx) = mpsc::unbounded(); |
| /// |
| /// thread::spawn(move || { |
| /// for i in 1..=5 { |
| /// tx.unbounded_send(Ok(i)).unwrap(); |
| /// } |
| /// tx.unbounded_send(Err(6)).unwrap(); |
| /// }); |
| /// |
| /// let output: Result<Vec<i32>, i32> = rx.try_collect().await; |
| /// assert_eq!(output, Err(6)); |
| /// # }) |
| /// ``` |
| </span><span class="kw">fn </span>try_collect<C: Default + Extend<<span class="self">Self</span>::Ok>>(<span class="self">self</span>) -> TryCollect<<span class="self">Self</span>, C> |
| <span class="kw">where |
| </span><span class="self">Self</span>: Sized, |
| { |
| assert_future::<<span class="prelude-ty">Result</span><C, <span class="self">Self</span>::Error>, <span class="kw">_</span>>(TryCollect::new(<span class="self">self</span>)) |
| } |
| |
| <span class="doccomment">/// An adaptor for chunking up successful items of the stream inside a vector. |
| /// |
| /// This combinator will attempt to pull successful items from this stream and buffer |
| /// them into a local vector. At most `capacity` items will get buffered |
| /// before they're yielded from the returned stream. |
| /// |
| /// Note that the vectors returned from this iterator may not always have |
| /// `capacity` elements. If the underlying stream ended and only a partial |
| /// vector was created, it'll be returned. Additionally if an error happens |
| /// from the underlying stream then the currently buffered items will be |
| /// yielded. |
| /// |
| /// This method is only available when the `std` or `alloc` feature of this |
| /// library is activated, and it is activated by default. |
| /// |
| /// This function is similar to |
| /// [`StreamExt::chunks`](crate::stream::StreamExt::chunks) but exits |
| /// early if an error occurs. |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// # futures::executor::block_on(async { |
| /// use futures::stream::{self, TryChunksError, TryStreamExt}; |
| /// |
| /// let stream = stream::iter(vec![Ok::<i32, i32>(1), Ok(2), Ok(3), Err(4), Ok(5), Ok(6)]); |
| /// let mut stream = stream.try_chunks(2); |
| /// |
| /// assert_eq!(stream.try_next().await, Ok(Some(vec![1, 2]))); |
| /// assert_eq!(stream.try_next().await, Err(TryChunksError(vec![3], 4))); |
| /// assert_eq!(stream.try_next().await, Ok(Some(vec![5, 6]))); |
| /// # }) |
| /// ``` |
| /// |
| /// # Panics |
| /// |
| /// This method will panic if `capacity` is zero. |
| </span><span class="attribute">#[cfg(feature = <span class="string">"alloc"</span>)] |
| </span><span class="kw">fn </span>try_chunks(<span class="self">self</span>, capacity: usize) -> TryChunks<<span class="self">Self</span>> |
| <span class="kw">where |
| </span><span class="self">Self</span>: Sized, |
| { |
| assert_stream::<<span class="prelude-ty">Result</span><Vec<<span class="self">Self</span>::Ok>, TryChunksError<<span class="self">Self</span>::Ok, <span class="self">Self</span>::Error>>, <span class="kw">_</span>>( |
| TryChunks::new(<span class="self">self</span>, capacity), |
| ) |
| } |
| |
| <span class="doccomment">/// Attempt to filter the values produced by this stream according to the |
| /// provided asynchronous closure. |
| /// |
| /// As values of this stream are made available, the provided predicate `f` |
| /// will be run on them. If the predicate returns a `Future` which resolves |
| /// to `true`, then the stream will yield the value, but if the predicate |
| /// return a `Future` which resolves to `false`, then the value will be |
| /// discarded and the next value will be produced. |
| /// |
| /// All errors are passed through without filtering in this combinator. |
| /// |
| /// Note that this function consumes the stream passed into it and returns a |
| /// wrapped version of it, similar to the existing `filter` methods in |
| /// the standard library. |
| /// |
| /// # Examples |
| /// ``` |
| /// # futures::executor::block_on(async { |
| /// use futures::future; |
| /// use futures::stream::{self, StreamExt, TryStreamExt}; |
| /// |
| /// let stream = stream::iter(vec![Ok(1i32), Ok(2i32), Ok(3i32), Err("error")]); |
| /// let mut evens = stream.try_filter(|x| { |
| /// future::ready(x % 2 == 0) |
| /// }); |
| /// |
| /// assert_eq!(evens.next().await, Some(Ok(2))); |
| /// assert_eq!(evens.next().await, Some(Err("error"))); |
| /// # }) |
| /// ``` |
| </span><span class="kw">fn </span>try_filter<Fut, F>(<span class="self">self</span>, f: F) -> TryFilter<<span class="self">Self</span>, Fut, F> |
| <span class="kw">where |
| </span>Fut: Future<Output = bool>, |
| F: FnMut(<span class="kw-2">&</span><span class="self">Self</span>::Ok) -> Fut, |
| <span class="self">Self</span>: Sized, |
| { |
| assert_stream::<<span class="prelude-ty">Result</span><<span class="self">Self</span>::Ok, <span class="self">Self</span>::Error>, <span class="kw">_</span>>(TryFilter::new(<span class="self">self</span>, f)) |
| } |
| |
| <span class="doccomment">/// Attempt to filter the values produced by this stream while |
| /// simultaneously mapping them to a different type according to the |
| /// provided asynchronous closure. |
| /// |
| /// As values of this stream are made available, the provided function will |
| /// be run on them. If the future returned by the predicate `f` resolves to |
| /// [`Some(item)`](Some) then the stream will yield the value `item`, but if |
| /// it resolves to [`None`] then the next value will be produced. |
| /// |
| /// All errors are passed through without filtering in this combinator. |
| /// |
| /// Note that this function consumes the stream passed into it and returns a |
| /// wrapped version of it, similar to the existing `filter_map` methods in |
| /// the standard library. |
| /// |
| /// # Examples |
| /// ``` |
| /// # futures::executor::block_on(async { |
| /// use futures::stream::{self, StreamExt, TryStreamExt}; |
| /// use futures::pin_mut; |
| /// |
| /// let stream = stream::iter(vec![Ok(1i32), Ok(6i32), Err("error")]); |
| /// let halves = stream.try_filter_map(|x| async move { |
| /// let ret = if x % 2 == 0 { Some(x / 2) } else { None }; |
| /// Ok(ret) |
| /// }); |
| /// |
| /// pin_mut!(halves); |
| /// assert_eq!(halves.next().await, Some(Ok(3))); |
| /// assert_eq!(halves.next().await, Some(Err("error"))); |
| /// # }) |
| /// ``` |
| </span><span class="kw">fn </span>try_filter_map<Fut, F, T>(<span class="self">self</span>, f: F) -> TryFilterMap<<span class="self">Self</span>, Fut, F> |
| <span class="kw">where |
| </span>Fut: TryFuture<<span class="prelude-val">Ok </span>= <span class="prelude-ty">Option</span><T>, Error = <span class="self">Self</span>::Error>, |
| F: FnMut(<span class="self">Self</span>::Ok) -> Fut, |
| <span class="self">Self</span>: Sized, |
| { |
| assert_stream::<<span class="prelude-ty">Result</span><T, <span class="self">Self</span>::Error>, <span class="kw">_</span>>(TryFilterMap::new(<span class="self">self</span>, f)) |
| } |
| |
| <span class="doccomment">/// Flattens a stream of streams into just one continuous stream. Produced streams |
| /// will be polled concurrently and any errors will be passed through without looking at them. |
| /// If the underlying base stream returns an error, it will be **immediately** propagated. |
| /// |
| /// The only argument is an optional limit on the number of concurrently |
| /// polled streams. If this limit is not `None`, no more than `limit` streams |
| /// will be polled at the same time. The `limit` argument is of type |
| /// `Into<Option<usize>>`, and so can be provided as either `None`, |
| /// `Some(10)`, or just `10`. Note: a limit of zero is interpreted as |
| /// no limit at all, and will have the same result as passing in `None`. |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// # futures::executor::block_on(async { |
| /// use futures::channel::mpsc; |
| /// use futures::stream::{StreamExt, TryStreamExt}; |
| /// use std::thread; |
| /// |
| /// let (tx1, rx1) = mpsc::unbounded(); |
| /// let (tx2, rx2) = mpsc::unbounded(); |
| /// let (tx3, rx3) = mpsc::unbounded(); |
| /// |
| /// thread::spawn(move || { |
| /// tx1.unbounded_send(Ok(1)).unwrap(); |
| /// }); |
| /// thread::spawn(move || { |
| /// tx2.unbounded_send(Ok(2)).unwrap(); |
| /// tx2.unbounded_send(Err(3)).unwrap(); |
| /// tx2.unbounded_send(Ok(4)).unwrap(); |
| /// }); |
| /// thread::spawn(move || { |
| /// tx3.unbounded_send(Ok(rx1)).unwrap(); |
| /// tx3.unbounded_send(Ok(rx2)).unwrap(); |
| /// tx3.unbounded_send(Err(5)).unwrap(); |
| /// }); |
| /// |
| /// let stream = rx3.try_flatten_unordered(None); |
| /// let mut values: Vec<_> = stream.collect().await; |
| /// values.sort(); |
| /// |
| /// assert_eq!(values, vec![Ok(1), Ok(2), Ok(4), Err(3), Err(5)]); |
| /// # }); |
| /// ``` |
| </span><span class="attribute">#[cfg(not(futures_no_atomic_cas))] |
| #[cfg(feature = <span class="string">"alloc"</span>)] |
| </span><span class="kw">fn </span>try_flatten_unordered(<span class="self">self</span>, limit: <span class="kw">impl </span>Into<<span class="prelude-ty">Option</span><usize>>) -> TryFlattenUnordered<<span class="self">Self</span>> |
| <span class="kw">where |
| </span><span class="self">Self</span>::Ok: TryStream + Unpin, |
| <<span class="self">Self</span>::Ok <span class="kw">as </span>TryStream>::Error: From<<span class="self">Self</span>::Error>, |
| <span class="self">Self</span>: Sized, |
| { |
| assert_stream::<<span class="prelude-ty">Result</span><<<span class="self">Self</span>::Ok <span class="kw">as </span>TryStream>::Ok, <<span class="self">Self</span>::Ok <span class="kw">as </span>TryStream>::Error>, <span class="kw">_</span>>( |
| TryFlattenUnordered::new(<span class="self">self</span>, limit), |
| ) |
| } |
| |
| <span class="doccomment">/// Flattens a stream of streams into just one continuous stream. |
| /// |
| /// If this stream's elements are themselves streams then this combinator |
| /// will flatten out the entire stream to one long chain of elements. Any |
| /// errors are passed through without looking at them, but otherwise each |
| /// individual stream will get exhausted before moving on to the next. |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// # futures::executor::block_on(async { |
| /// use futures::channel::mpsc; |
| /// use futures::stream::{StreamExt, TryStreamExt}; |
| /// use std::thread; |
| /// |
| /// let (tx1, rx1) = mpsc::unbounded(); |
| /// let (tx2, rx2) = mpsc::unbounded(); |
| /// let (tx3, rx3) = mpsc::unbounded(); |
| /// |
| /// thread::spawn(move || { |
| /// tx1.unbounded_send(Ok(1)).unwrap(); |
| /// }); |
| /// thread::spawn(move || { |
| /// tx2.unbounded_send(Ok(2)).unwrap(); |
| /// tx2.unbounded_send(Err(3)).unwrap(); |
| /// tx2.unbounded_send(Ok(4)).unwrap(); |
| /// }); |
| /// thread::spawn(move || { |
| /// tx3.unbounded_send(Ok(rx1)).unwrap(); |
| /// tx3.unbounded_send(Ok(rx2)).unwrap(); |
| /// tx3.unbounded_send(Err(5)).unwrap(); |
| /// }); |
| /// |
| /// let mut stream = rx3.try_flatten(); |
| /// assert_eq!(stream.next().await, Some(Ok(1))); |
| /// assert_eq!(stream.next().await, Some(Ok(2))); |
| /// assert_eq!(stream.next().await, Some(Err(3))); |
| /// assert_eq!(stream.next().await, Some(Ok(4))); |
| /// assert_eq!(stream.next().await, Some(Err(5))); |
| /// assert_eq!(stream.next().await, None); |
| /// # }); |
| /// ``` |
| </span><span class="kw">fn </span>try_flatten(<span class="self">self</span>) -> TryFlatten<<span class="self">Self</span>> |
| <span class="kw">where |
| </span><span class="self">Self</span>::Ok: TryStream, |
| <<span class="self">Self</span>::Ok <span class="kw">as </span>TryStream>::Error: From<<span class="self">Self</span>::Error>, |
| <span class="self">Self</span>: Sized, |
| { |
| assert_stream::<<span class="prelude-ty">Result</span><<<span class="self">Self</span>::Ok <span class="kw">as </span>TryStream>::Ok, <<span class="self">Self</span>::Ok <span class="kw">as </span>TryStream>::Error>, <span class="kw">_</span>>( |
| TryFlatten::new(<span class="self">self</span>), |
| ) |
| } |
| |
| <span class="doccomment">/// Attempt to execute an accumulating asynchronous computation over a |
| /// stream, collecting all the values into one final result. |
| /// |
| /// This combinator will accumulate all values returned by this stream |
| /// according to the closure provided. The initial state is also provided to |
| /// this method and then is returned again by each execution of the closure. |
| /// Once the entire stream has been exhausted the returned future will |
| /// resolve to this value. |
| /// |
| /// This method is similar to [`fold`](crate::stream::StreamExt::fold), but will |
| /// exit early if an error is encountered in either the stream or the |
| /// provided closure. |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// # futures::executor::block_on(async { |
| /// use futures::stream::{self, TryStreamExt}; |
| /// |
| /// let number_stream = stream::iter(vec![Ok::<i32, i32>(1), Ok(2)]); |
| /// let sum = number_stream.try_fold(0, |acc, x| async move { Ok(acc + x) }); |
| /// assert_eq!(sum.await, Ok(3)); |
| /// |
| /// let number_stream_with_err = stream::iter(vec![Ok::<i32, i32>(1), Err(2), Ok(1)]); |
| /// let sum = number_stream_with_err.try_fold(0, |acc, x| async move { Ok(acc + x) }); |
| /// assert_eq!(sum.await, Err(2)); |
| /// # }) |
| /// ``` |
| </span><span class="kw">fn </span>try_fold<T, Fut, F>(<span class="self">self</span>, init: T, f: F) -> TryFold<<span class="self">Self</span>, Fut, T, F> |
| <span class="kw">where |
| </span>F: FnMut(T, <span class="self">Self</span>::Ok) -> Fut, |
| Fut: TryFuture<<span class="prelude-val">Ok </span>= T, Error = <span class="self">Self</span>::Error>, |
| <span class="self">Self</span>: Sized, |
| { |
| assert_future::<<span class="prelude-ty">Result</span><T, <span class="self">Self</span>::Error>, <span class="kw">_</span>>(TryFold::new(<span class="self">self</span>, f, init)) |
| } |
| |
| <span class="doccomment">/// Attempt to concatenate all items of a stream into a single |
| /// extendable destination, returning a future representing the end result. |
| /// |
| /// This combinator will extend the first item with the contents of all |
| /// the subsequent successful results of the stream. If the stream is empty, |
| /// the default value will be returned. |
| /// |
| /// Works with all collections that implement the [`Extend`](std::iter::Extend) trait. |
| /// |
| /// This method is similar to [`concat`](crate::stream::StreamExt::concat), but will |
| /// exit early if an error is encountered in the stream. |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// # futures::executor::block_on(async { |
| /// use futures::channel::mpsc; |
| /// use futures::stream::TryStreamExt; |
| /// use std::thread; |
| /// |
| /// let (tx, rx) = mpsc::unbounded::<Result<Vec<i32>, ()>>(); |
| /// |
| /// thread::spawn(move || { |
| /// for i in (0..3).rev() { |
| /// let n = i * 3; |
| /// tx.unbounded_send(Ok(vec![n + 1, n + 2, n + 3])).unwrap(); |
| /// } |
| /// }); |
| /// |
| /// let result = rx.try_concat().await; |
| /// |
| /// assert_eq!(result, Ok(vec![7, 8, 9, 4, 5, 6, 1, 2, 3])); |
| /// # }); |
| /// ``` |
| </span><span class="kw">fn </span>try_concat(<span class="self">self</span>) -> TryConcat<<span class="self">Self</span>> |
| <span class="kw">where |
| </span><span class="self">Self</span>: Sized, |
| <span class="self">Self</span>::Ok: Extend<<<<span class="self">Self </span><span class="kw">as </span>TryStream>::Ok <span class="kw">as </span>IntoIterator>::Item> + IntoIterator + Default, |
| { |
| assert_future::<<span class="prelude-ty">Result</span><<span class="self">Self</span>::Ok, <span class="self">Self</span>::Error>, <span class="kw">_</span>>(TryConcat::new(<span class="self">self</span>)) |
| } |
| |
| <span class="doccomment">/// Attempt to execute several futures from a stream concurrently (unordered). |
| /// |
| /// This stream's `Ok` type must be a [`TryFuture`](futures_core::future::TryFuture) with an `Error` type |
| /// that matches the stream's `Error` type. |
| /// |
| /// This adaptor will buffer up to `n` futures and then return their |
| /// outputs in the order in which they complete. If the underlying stream |
| /// returns an error, it will be immediately propagated. |
| /// |
| /// The returned stream will be a stream of results, each containing either |
| /// an error or a future's output. An error can be produced either by the |
| /// underlying stream itself or by one of the futures it yielded. |
| /// |
| /// This method is only available when the `std` or `alloc` feature of this |
| /// library is activated, and it is activated by default. |
| /// |
| /// # Examples |
| /// |
| /// Results are returned in the order of completion: |
| /// ``` |
| /// # futures::executor::block_on(async { |
| /// use futures::channel::oneshot; |
| /// use futures::stream::{self, StreamExt, TryStreamExt}; |
| /// |
| /// let (send_one, recv_one) = oneshot::channel(); |
| /// let (send_two, recv_two) = oneshot::channel(); |
| /// |
| /// let stream_of_futures = stream::iter(vec![Ok(recv_one), Ok(recv_two)]); |
| /// |
| /// let mut buffered = stream_of_futures.try_buffer_unordered(10); |
| /// |
| /// send_two.send(2i32)?; |
| /// assert_eq!(buffered.next().await, Some(Ok(2i32))); |
| /// |
| /// send_one.send(1i32)?; |
| /// assert_eq!(buffered.next().await, Some(Ok(1i32))); |
| /// |
| /// assert_eq!(buffered.next().await, None); |
| /// # Ok::<(), i32>(()) }).unwrap(); |
| /// ``` |
| /// |
| /// Errors from the underlying stream itself are propagated: |
| /// ``` |
| /// # futures::executor::block_on(async { |
| /// use futures::channel::mpsc; |
| /// use futures::stream::{StreamExt, TryStreamExt}; |
| /// |
| /// let (sink, stream_of_futures) = mpsc::unbounded(); |
| /// let mut buffered = stream_of_futures.try_buffer_unordered(10); |
| /// |
| /// sink.unbounded_send(Ok(async { Ok(7i32) }))?; |
| /// assert_eq!(buffered.next().await, Some(Ok(7i32))); |
| /// |
| /// sink.unbounded_send(Err("error in the stream"))?; |
| /// assert_eq!(buffered.next().await, Some(Err("error in the stream"))); |
| /// # Ok::<(), Box<dyn std::error::Error>>(()) }).unwrap(); |
| /// ``` |
| </span><span class="attribute">#[cfg(not(futures_no_atomic_cas))] |
| #[cfg(feature = <span class="string">"alloc"</span>)] |
| </span><span class="kw">fn </span>try_buffer_unordered(<span class="self">self</span>, n: usize) -> TryBufferUnordered<<span class="self">Self</span>> |
| <span class="kw">where |
| </span><span class="self">Self</span>::Ok: TryFuture<Error = <span class="self">Self</span>::Error>, |
| <span class="self">Self</span>: Sized, |
| { |
| assert_stream::<<span class="prelude-ty">Result</span><<<span class="self">Self</span>::Ok <span class="kw">as </span>TryFuture>::Ok, <span class="self">Self</span>::Error>, <span class="kw">_</span>>( |
| TryBufferUnordered::new(<span class="self">self</span>, n), |
| ) |
| } |
| |
| <span class="doccomment">/// Attempt to execute several futures from a stream concurrently. |
| /// |
| /// This stream's `Ok` type must be a [`TryFuture`](futures_core::future::TryFuture) with an `Error` type |
| /// that matches the stream's `Error` type. |
| /// |
| /// This adaptor will buffer up to `n` futures and then return their |
| /// outputs in the same order as the underlying stream. If the underlying stream returns an error, it will |
| /// be immediately propagated. |
| /// |
| /// The returned stream will be a stream of results, each containing either |
| /// an error or a future's output. An error can be produced either by the |
| /// underlying stream itself or by one of the futures it yielded. |
| /// |
| /// This method is only available when the `std` or `alloc` feature of this |
| /// library is activated, and it is activated by default. |
| /// |
| /// # Examples |
| /// |
| /// Results are returned in the order of addition: |
| /// ``` |
| /// # futures::executor::block_on(async { |
| /// use futures::channel::oneshot; |
| /// use futures::future::lazy; |
| /// use futures::stream::{self, StreamExt, TryStreamExt}; |
| /// |
| /// let (send_one, recv_one) = oneshot::channel(); |
| /// let (send_two, recv_two) = oneshot::channel(); |
| /// |
| /// let mut buffered = lazy(move |cx| { |
| /// let stream_of_futures = stream::iter(vec![Ok(recv_one), Ok(recv_two)]); |
| /// |
| /// let mut buffered = stream_of_futures.try_buffered(10); |
| /// |
| /// assert!(buffered.try_poll_next_unpin(cx).is_pending()); |
| /// |
| /// send_two.send(2i32)?; |
| /// assert!(buffered.try_poll_next_unpin(cx).is_pending()); |
| /// Ok::<_, i32>(buffered) |
| /// }).await?; |
| /// |
| /// send_one.send(1i32)?; |
| /// assert_eq!(buffered.next().await, Some(Ok(1i32))); |
| /// assert_eq!(buffered.next().await, Some(Ok(2i32))); |
| /// |
| /// assert_eq!(buffered.next().await, None); |
| /// # Ok::<(), i32>(()) }).unwrap(); |
| /// ``` |
| /// |
| /// Errors from the underlying stream itself are propagated: |
| /// ``` |
| /// # futures::executor::block_on(async { |
| /// use futures::channel::mpsc; |
| /// use futures::stream::{StreamExt, TryStreamExt}; |
| /// |
| /// let (sink, stream_of_futures) = mpsc::unbounded(); |
| /// let mut buffered = stream_of_futures.try_buffered(10); |
| /// |
| /// sink.unbounded_send(Ok(async { Ok(7i32) }))?; |
| /// assert_eq!(buffered.next().await, Some(Ok(7i32))); |
| /// |
| /// sink.unbounded_send(Err("error in the stream"))?; |
| /// assert_eq!(buffered.next().await, Some(Err("error in the stream"))); |
| /// # Ok::<(), Box<dyn std::error::Error>>(()) }).unwrap(); |
| /// ``` |
| </span><span class="attribute">#[cfg(not(futures_no_atomic_cas))] |
| #[cfg(feature = <span class="string">"alloc"</span>)] |
| </span><span class="kw">fn </span>try_buffered(<span class="self">self</span>, n: usize) -> TryBuffered<<span class="self">Self</span>> |
| <span class="kw">where |
| </span><span class="self">Self</span>::Ok: TryFuture<Error = <span class="self">Self</span>::Error>, |
| <span class="self">Self</span>: Sized, |
| { |
| assert_stream::<<span class="prelude-ty">Result</span><<<span class="self">Self</span>::Ok <span class="kw">as </span>TryFuture>::Ok, <span class="self">Self</span>::Error>, <span class="kw">_</span>>(TryBuffered::new( |
| <span class="self">self</span>, n, |
| )) |
| } |
| |
| <span class="comment">// TODO: false positive warning from rustdoc. Verify once #43466 settles |
| // |
| </span><span class="doccomment">/// A convenience method for calling [`TryStream::try_poll_next`] on [`Unpin`] |
| /// stream types. |
| </span><span class="kw">fn </span>try_poll_next_unpin( |
| <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">Option</span><<span class="prelude-ty">Result</span><<span class="self">Self</span>::Ok, <span class="self">Self</span>::Error>>> |
| <span class="kw">where |
| </span><span class="self">Self</span>: Unpin, |
| { |
| Pin::new(<span class="self">self</span>).try_poll_next(cx) |
| } |
| |
| <span class="doccomment">/// Wraps a [`TryStream`] into a stream compatible with libraries using |
| /// futures 0.1 `Stream`. Requires the `compat` feature to be enabled. |
| /// ``` |
| /// # if cfg!(miri) { return; } // Miri does not support epoll |
| /// use futures::future::{FutureExt, TryFutureExt}; |
| /// # let (tx, rx) = futures::channel::oneshot::channel(); |
| /// |
| /// let future03 = async { |
| /// println!("Running on the pool"); |
| /// tx.send(42).unwrap(); |
| /// }; |
| /// |
| /// let future01 = future03 |
| /// .unit_error() // Make it a TryFuture |
| /// .boxed() // Make it Unpin |
| /// .compat(); |
| /// |
| /// tokio::run(future01); |
| /// # assert_eq!(42, futures::executor::block_on(rx).unwrap()); |
| /// ``` |
| </span><span class="attribute">#[cfg(feature = <span class="string">"compat"</span>)] |
| #[cfg_attr(docsrs, doc(cfg(feature = <span class="string">"compat"</span>)))] |
| </span><span class="kw">fn </span>compat(<span class="self">self</span>) -> Compat<<span class="self">Self</span>> |
| <span class="kw">where |
| </span><span class="self">Self</span>: Sized + Unpin, |
| { |
| Compat::new(<span class="self">self</span>) |
| } |
| |
| <span class="doccomment">/// Adapter that converts this stream into an [`AsyncBufRead`](crate::io::AsyncBufRead). |
| /// |
| /// This method is only available when the `std` feature of this |
| /// library is activated, and it is activated by default. |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// # futures::executor::block_on(async { |
| /// use futures::stream::{self, TryStreamExt}; |
| /// use futures::io::AsyncReadExt; |
| /// |
| /// let stream = stream::iter([Ok(vec![1, 2, 3]), Ok(vec![4, 5])]); |
| /// let mut reader = stream.into_async_read(); |
| /// |
| /// let mut buf = Vec::new(); |
| /// reader.read_to_end(&mut buf).await.unwrap(); |
| /// assert_eq!(buf, [1, 2, 3, 4, 5]); |
| /// # }) |
| /// ``` |
| </span><span class="attribute">#[cfg(feature = <span class="string">"io"</span>)] |
| #[cfg_attr(docsrs, doc(cfg(feature = <span class="string">"io"</span>)))] |
| #[cfg(feature = <span class="string">"std"</span>)] |
| </span><span class="kw">fn </span>into_async_read(<span class="self">self</span>) -> IntoAsyncRead<<span class="self">Self</span>> |
| <span class="kw">where |
| </span><span class="self">Self</span>: Sized + TryStreamExt<Error = std::io::Error>, |
| <span class="self">Self</span>::Ok: AsRef<[u8]>, |
| { |
| <span class="kw">crate</span>::io::assert_read(IntoAsyncRead::new(<span class="self">self</span>)) |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../../../" data-current-crate="futures_util" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
