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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/futures-util-0.3.28/src/future/try_future/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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</pre><pre class="rust"><code><span class="doccomment">//! Futures
//!
//! This module contains a number of functions for working with `Future`s,
//! including the `FutureExt` trait which adds methods to `Future` types.
</span><span class="attribute">#[cfg(feature = <span class="string">&quot;compat&quot;</span>)]
</span><span class="kw">use </span><span class="kw">crate</span>::compat::Compat;
<span class="kw">use </span>core::pin::Pin;
<span class="kw">use </span>futures_core::{
future::TryFuture,
stream::TryStream,
task::{Context, Poll},
};
<span class="attribute">#[cfg(feature = <span class="string">&quot;sink&quot;</span>)]
</span><span class="kw">use </span>futures_sink::Sink;
<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, map_ok_or_else_fn,
unwrap_or_else_fn, InspectErrFn, InspectOkFn, IntoFn, MapErrFn, MapOkFn, MapOkOrElseFn,
UnwrapOrElseFn,
};
<span class="kw">use </span><span class="kw">crate</span>::future::{assert_future, Inspect, Map};
<span class="kw">use </span><span class="kw">crate</span>::stream::assert_stream;
<span class="comment">// Combinators
</span><span class="kw">mod </span>into_future;
<span class="kw">mod </span>try_flatten;
<span class="kw">mod </span>try_flatten_err;
<span class="macro">delegate_all!</span>(
<span class="doccomment">/// Future for the [`try_flatten`](TryFutureExt::try_flatten) method.
</span>TryFlatten&lt;Fut1, Fut2&gt;(
try_flatten::TryFlatten&lt;Fut1, Fut2&gt;
): Debug + Future + FusedFuture + New[|x: Fut1| try_flatten::TryFlatten::new(x)]
);
<span class="macro">delegate_all!</span>(
<span class="doccomment">/// Future for the [`try_flatten_err`](TryFutureExt::try_flatten_err) method.
</span>TryFlattenErr&lt;Fut1, Fut2&gt;(
try_flatten_err::TryFlattenErr&lt;Fut1, Fut2&gt;
): Debug + Future + FusedFuture + New[|x: Fut1| try_flatten_err::TryFlattenErr::new(x)]
);
<span class="macro">delegate_all!</span>(
<span class="doccomment">/// Future for the [`try_flatten_stream`](TryFutureExt::try_flatten_stream) method.
</span>TryFlattenStream&lt;Fut&gt;(
try_flatten::TryFlatten&lt;Fut, Fut::Ok&gt;
): Debug + Sink + Stream + FusedStream + New[|x: Fut| try_flatten::TryFlatten::new(x)]
<span class="kw">where </span>Fut: TryFuture
);
<span class="attribute">#[cfg(feature = <span class="string">&quot;sink&quot;</span>)]
</span><span class="macro">delegate_all!</span>(
<span class="doccomment">/// Sink for the [`flatten_sink`](TryFutureExt::flatten_sink) method.
</span><span class="attribute">#[cfg_attr(docsrs, doc(cfg(feature = <span class="string">&quot;sink&quot;</span>)))]
</span>FlattenSink&lt;Fut, Si&gt;(
try_flatten::TryFlatten&lt;Fut, Si&gt;
): Debug + Sink + Stream + FusedStream + New[|x: Fut| try_flatten::TryFlatten::new(x)]
);
<span class="macro">delegate_all!</span>(
<span class="doccomment">/// Future for the [`and_then`](TryFutureExt::and_then) method.
</span>AndThen&lt;Fut1, Fut2, F&gt;(
TryFlatten&lt;MapOk&lt;Fut1, F&gt;, Fut2&gt;
): Debug + Future + FusedFuture + New[|x: Fut1, f: F| TryFlatten::new(MapOk::new(x, f))]
);
<span class="macro">delegate_all!</span>(
<span class="doccomment">/// Future for the [`or_else`](TryFutureExt::or_else) method.
</span>OrElse&lt;Fut1, Fut2, F&gt;(
TryFlattenErr&lt;MapErr&lt;Fut1, F&gt;, Fut2&gt;
): Debug + Future + FusedFuture + New[|x: Fut1, f: F| TryFlattenErr::new(MapErr::new(x, f))]
);
<span class="macro">delegate_all!</span>(
<span class="doccomment">/// Future for the [`err_into`](TryFutureExt::err_into) method.
</span>ErrInto&lt;Fut, E&gt;(
MapErr&lt;Fut, IntoFn&lt;E&gt;&gt;
): Debug + Future + FusedFuture + New[|x: Fut| MapErr::new(x, into_fn())]
);
<span class="macro">delegate_all!</span>(
<span class="doccomment">/// Future for the [`ok_into`](TryFutureExt::ok_into) method.
</span>OkInto&lt;Fut, E&gt;(
MapOk&lt;Fut, IntoFn&lt;E&gt;&gt;
): Debug + Future + FusedFuture + New[|x: Fut| MapOk::new(x, into_fn())]
);
<span class="macro">delegate_all!</span>(
<span class="doccomment">/// Future for the [`inspect_ok`](super::TryFutureExt::inspect_ok) method.
</span>InspectOk&lt;Fut, F&gt;(
Inspect&lt;IntoFuture&lt;Fut&gt;, InspectOkFn&lt;F&gt;&gt;
): Debug + Future + FusedFuture + New[|x: Fut, f: F| Inspect::new(IntoFuture::new(x), inspect_ok_fn(f))]
);
<span class="macro">delegate_all!</span>(
<span class="doccomment">/// Future for the [`inspect_err`](super::TryFutureExt::inspect_err) method.
</span>InspectErr&lt;Fut, F&gt;(
Inspect&lt;IntoFuture&lt;Fut&gt;, InspectErrFn&lt;F&gt;&gt;
): Debug + Future + FusedFuture + New[|x: Fut, f: F| Inspect::new(IntoFuture::new(x), inspect_err_fn(f))]
);
<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_future::IntoFuture;
<span class="macro">delegate_all!</span>(
<span class="doccomment">/// Future for the [`map_ok`](TryFutureExt::map_ok) method.
</span>MapOk&lt;Fut, F&gt;(
Map&lt;IntoFuture&lt;Fut&gt;, MapOkFn&lt;F&gt;&gt;
): Debug + Future + FusedFuture + New[|x: Fut, f: F| Map::new(IntoFuture::new(x), map_ok_fn(f))]
);
<span class="macro">delegate_all!</span>(
<span class="doccomment">/// Future for the [`map_err`](TryFutureExt::map_err) method.
</span>MapErr&lt;Fut, F&gt;(
Map&lt;IntoFuture&lt;Fut&gt;, MapErrFn&lt;F&gt;&gt;
): Debug + Future + FusedFuture + New[|x: Fut, f: F| Map::new(IntoFuture::new(x), map_err_fn(f))]
);
<span class="macro">delegate_all!</span>(
<span class="doccomment">/// Future for the [`map_ok_or_else`](TryFutureExt::map_ok_or_else) method.
</span>MapOkOrElse&lt;Fut, F, G&gt;(
Map&lt;IntoFuture&lt;Fut&gt;, MapOkOrElseFn&lt;F, G&gt;&gt;
): Debug + Future + FusedFuture + New[|x: Fut, f: F, g: G| Map::new(IntoFuture::new(x), map_ok_or_else_fn(f, g))]
);
<span class="macro">delegate_all!</span>(
<span class="doccomment">/// Future for the [`unwrap_or_else`](TryFutureExt::unwrap_or_else) method.
</span>UnwrapOrElse&lt;Fut, F&gt;(
Map&lt;IntoFuture&lt;Fut&gt;, UnwrapOrElseFn&lt;F&gt;&gt;
): Debug + Future + FusedFuture + New[|x: Fut, f: F| Map::new(IntoFuture::new(x), unwrap_or_else_fn(f))]
);
<span class="kw">impl</span>&lt;Fut: <span class="question-mark">?</span>Sized + TryFuture&gt; TryFutureExt <span class="kw">for </span>Fut {}
<span class="doccomment">/// Adapters specific to [`Result`]-returning futures
</span><span class="kw">pub trait </span>TryFutureExt: TryFuture {
<span class="doccomment">/// Flattens the execution of this future when the successful result of this
/// future is a [`Sink`].
///
/// This can be useful when sink initialization is deferred, and it is
/// convenient to work with that sink as if the sink was available at the
/// call site.
///
/// Note that this function consumes this future and returns a wrapped
/// version of it.
///
/// # Examples
///
/// ```
/// use futures::future::{Future, TryFutureExt};
/// use futures::sink::Sink;
/// # use futures::channel::mpsc::{self, SendError};
/// # type T = i32;
/// # type E = SendError;
///
/// fn make_sink_async() -&gt; impl Future&lt;Output = Result&lt;
/// impl Sink&lt;T, Error = E&gt;,
/// E,
/// &gt;&gt; { // ... }
/// # let (tx, _rx) = mpsc::unbounded::&lt;i32&gt;();
/// # futures::future::ready(Ok(tx))
/// # }
/// fn take_sink(sink: impl Sink&lt;T, Error = E&gt;) { /* ... */ }
///
/// let fut = make_sink_async();
/// take_sink(fut.flatten_sink())
/// ```
</span><span class="attribute">#[cfg(feature = <span class="string">&quot;sink&quot;</span>)]
#[cfg_attr(docsrs, doc(cfg(feature = <span class="string">&quot;sink&quot;</span>)))]
</span><span class="kw">fn </span>flatten_sink&lt;Item&gt;(<span class="self">self</span>) -&gt; FlattenSink&lt;<span class="self">Self</span>, <span class="self">Self</span>::Ok&gt;
<span class="kw">where
</span><span class="self">Self</span>::Ok: Sink&lt;Item, Error = <span class="self">Self</span>::Error&gt;,
<span class="self">Self</span>: Sized,
{
<span class="kw">crate</span>::sink::assert_sink::&lt;Item, <span class="self">Self</span>::Error, <span class="kw">_</span>&gt;(FlattenSink::new(<span class="self">self</span>))
}
<span class="doccomment">/// Maps this future&#39;s success value to a different value.
///
/// This method can be used to change the [`Ok`](TryFuture::Ok) type of the
/// future into a different type. It is similar to the [`Result::map`]
/// method. You can use this method to chain along a computation once the
/// future has been resolved.
///
/// The provided closure `f` will only be called if this future is resolved
/// to an [`Ok`]. If it resolves to an [`Err`], panics, or is dropped, then
/// the provided closure will never be invoked.
///
/// Note that this method consumes the future it is called on and returns a
/// wrapped version of it.
///
/// # Examples
///
/// ```
/// use futures::future::TryFutureExt;
///
/// # futures::executor::block_on(async {
/// let future = async { Ok::&lt;i32, i32&gt;(1) };
/// let future = future.map_ok(|x| x + 3);
/// assert_eq!(future.await, Ok(4));
/// # });
/// ```
///
/// Calling [`map_ok`](TryFutureExt::map_ok) on an errored future has no
/// effect:
///
/// ```
/// use futures::future::TryFutureExt;
///
/// # futures::executor::block_on(async {
/// let future = async { Err::&lt;i32, i32&gt;(1) };
/// let future = future.map_ok(|x| x + 3);
/// assert_eq!(future.await, Err(1));
/// # });
/// ```
</span><span class="kw">fn </span>map_ok&lt;T, F&gt;(<span class="self">self</span>, f: F) -&gt; MapOk&lt;<span class="self">Self</span>, F&gt;
<span class="kw">where
</span>F: FnOnce(<span class="self">Self</span>::Ok) -&gt; T,
<span class="self">Self</span>: Sized,
{
assert_future::&lt;<span class="prelude-ty">Result</span>&lt;T, <span class="self">Self</span>::Error&gt;, <span class="kw">_</span>&gt;(MapOk::new(<span class="self">self</span>, f))
}
<span class="doccomment">/// Maps this future&#39;s success value to a different value, and permits for error handling resulting in the same type.
///
/// This method can be used to coalesce your [`Ok`](TryFuture::Ok) type and [`Error`](TryFuture::Error) into another type,
/// where that type is the same for both outcomes.
///
/// The provided closure `f` will only be called if this future is resolved
/// to an [`Ok`]. If it resolves to an [`Err`], panics, or is dropped, then
/// the provided closure will never be invoked.
///
/// The provided closure `e` will only be called if this future is resolved
/// to an [`Err`]. If it resolves to an [`Ok`], panics, or is dropped, then
/// the provided closure will never be invoked.
///
/// Note that this method consumes the future it is called on and returns a
/// wrapped version of it.
///
/// # Examples
///
/// ```
/// use futures::future::TryFutureExt;
///
/// # futures::executor::block_on(async {
/// let future = async { Ok::&lt;i32, i32&gt;(5) };
/// let future = future.map_ok_or_else(|x| x * 2, |x| x + 3);
/// assert_eq!(future.await, 8);
///
/// let future = async { Err::&lt;i32, i32&gt;(5) };
/// let future = future.map_ok_or_else(|x| x * 2, |x| x + 3);
/// assert_eq!(future.await, 10);
/// # });
/// ```
///
</span><span class="kw">fn </span>map_ok_or_else&lt;T, E, F&gt;(<span class="self">self</span>, e: E, f: F) -&gt; MapOkOrElse&lt;<span class="self">Self</span>, F, E&gt;
<span class="kw">where
</span>F: FnOnce(<span class="self">Self</span>::Ok) -&gt; T,
E: FnOnce(<span class="self">Self</span>::Error) -&gt; T,
<span class="self">Self</span>: Sized,
{
assert_future::&lt;T, <span class="kw">_</span>&gt;(MapOkOrElse::new(<span class="self">self</span>, f, e))
}
<span class="doccomment">/// Maps this future&#39;s error value to a different value.
///
/// This method can be used to change the [`Error`](TryFuture::Error) type
/// of the future into a different type. It is similar to the
/// [`Result::map_err`] method. You can use this method for example to
/// ensure that futures have the same [`Error`](TryFuture::Error) type when
/// using [`select!`] or [`join!`].
///
/// The provided closure `f` will only be called if this future is resolved
/// to an [`Err`]. If it resolves to an [`Ok`], panics, or is dropped, then
/// the provided closure will never be invoked.
///
/// Note that this method consumes the future it is called on and returns a
/// wrapped version of it.
///
/// # Examples
///
/// ```
/// use futures::future::TryFutureExt;
///
/// # futures::executor::block_on(async {
/// let future = async { Err::&lt;i32, i32&gt;(1) };
/// let future = future.map_err(|x| x + 3);
/// assert_eq!(future.await, Err(4));
/// # });
/// ```
///
/// Calling [`map_err`](TryFutureExt::map_err) on a successful future has
/// no effect:
///
/// ```
/// use futures::future::TryFutureExt;
///
/// # futures::executor::block_on(async {
/// let future = async { Ok::&lt;i32, i32&gt;(1) };
/// let future = future.map_err(|x| x + 3);
/// assert_eq!(future.await, Ok(1));
/// # });
/// ```
///
/// [`join!`]: crate::join
/// [`select!`]: crate::select
</span><span class="kw">fn </span>map_err&lt;E, F&gt;(<span class="self">self</span>, f: F) -&gt; MapErr&lt;<span class="self">Self</span>, F&gt;
<span class="kw">where
</span>F: FnOnce(<span class="self">Self</span>::Error) -&gt; E,
<span class="self">Self</span>: Sized,
{
assert_future::&lt;<span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>::Ok, E&gt;, <span class="kw">_</span>&gt;(MapErr::new(<span class="self">self</span>, f))
}
<span class="doccomment">/// Maps this future&#39;s [`Error`](TryFuture::Error) to a new error type
/// using the [`Into`](std::convert::Into) trait.
///
/// This method does for futures what the `?`-operator does for
/// [`Result`]: It lets the compiler infer the type of the resulting
/// error. Just as [`map_err`](TryFutureExt::map_err), this is useful for
/// example to ensure that futures have the same [`Error`](TryFuture::Error)
/// type when using [`select!`] or [`join!`].
///
/// Note that this method consumes the future it is called on and returns a
/// wrapped version of it.
///
/// # Examples
///
/// ```
/// use futures::future::TryFutureExt;
///
/// # futures::executor::block_on(async {
/// let future_err_u8 = async { Err::&lt;(), u8&gt;(1) };
/// let future_err_i32 = future_err_u8.err_into::&lt;i32&gt;();
/// # });
/// ```
///
/// [`join!`]: crate::join
/// [`select!`]: crate::select
</span><span class="kw">fn </span>err_into&lt;E&gt;(<span class="self">self</span>) -&gt; ErrInto&lt;<span class="self">Self</span>, E&gt;
<span class="kw">where
</span><span class="self">Self</span>: Sized,
<span class="self">Self</span>::Error: Into&lt;E&gt;,
{
assert_future::&lt;<span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>::Ok, E&gt;, <span class="kw">_</span>&gt;(ErrInto::new(<span class="self">self</span>))
}
<span class="doccomment">/// Maps this future&#39;s [`Ok`](TryFuture::Ok) to a new type
/// using the [`Into`](std::convert::Into) trait.
</span><span class="kw">fn </span>ok_into&lt;U&gt;(<span class="self">self</span>) -&gt; OkInto&lt;<span class="self">Self</span>, U&gt;
<span class="kw">where
</span><span class="self">Self</span>: Sized,
<span class="self">Self</span>::Ok: Into&lt;U&gt;,
{
assert_future::&lt;<span class="prelude-ty">Result</span>&lt;U, <span class="self">Self</span>::Error&gt;, <span class="kw">_</span>&gt;(OkInto::new(<span class="self">self</span>))
}
<span class="doccomment">/// Executes another future after this one resolves successfully. The
/// success value is passed to a closure to create this subsequent future.
///
/// The provided closure `f` will only be called if this future is resolved
/// to an [`Ok`]. If this future resolves to an [`Err`], panics, or is
/// dropped, then the provided closure will never be invoked. The
/// [`Error`](TryFuture::Error) type of this future and the future
/// returned by `f` have to match.
///
/// Note that this method consumes the future it is called on and returns a
/// wrapped version of it.
///
/// # Examples
///
/// ```
/// use futures::future::TryFutureExt;
///
/// # futures::executor::block_on(async {
/// let future = async { Ok::&lt;i32, i32&gt;(1) };
/// let future = future.and_then(|x| async move { Ok::&lt;i32, i32&gt;(x + 3) });
/// assert_eq!(future.await, Ok(4));
/// # });
/// ```
///
/// Calling [`and_then`](TryFutureExt::and_then) on an errored future has no
/// effect:
///
/// ```
/// use futures::future::TryFutureExt;
///
/// # futures::executor::block_on(async {
/// let future = async { Err::&lt;i32, i32&gt;(1) };
/// let future = future.and_then(|x| async move { Err::&lt;i32, i32&gt;(x + 3) });
/// assert_eq!(future.await, Err(1));
/// # });
/// ```
</span><span class="kw">fn </span>and_then&lt;Fut, F&gt;(<span class="self">self</span>, f: F) -&gt; AndThen&lt;<span class="self">Self</span>, Fut, F&gt;
<span class="kw">where
</span>F: FnOnce(<span class="self">Self</span>::Ok) -&gt; Fut,
Fut: TryFuture&lt;Error = <span class="self">Self</span>::Error&gt;,
<span class="self">Self</span>: Sized,
{
assert_future::&lt;<span class="prelude-ty">Result</span>&lt;Fut::Ok, Fut::Error&gt;, <span class="kw">_</span>&gt;(AndThen::new(<span class="self">self</span>, f))
}
<span class="doccomment">/// Executes another future if this one resolves to an error. The
/// error value is passed to a closure to create this subsequent future.
///
/// The provided closure `f` will only be called if this future is resolved
/// to an [`Err`]. If this future resolves to an [`Ok`], panics, or is
/// dropped, then the provided closure will never be invoked. The
/// [`Ok`](TryFuture::Ok) type of this future and the future returned by `f`
/// have to match.
///
/// Note that this method consumes the future it is called on and returns a
/// wrapped version of it.
///
/// # Examples
///
/// ```
/// use futures::future::TryFutureExt;
///
/// # futures::executor::block_on(async {
/// let future = async { Err::&lt;i32, i32&gt;(1) };
/// let future = future.or_else(|x| async move { Err::&lt;i32, i32&gt;(x + 3) });
/// assert_eq!(future.await, Err(4));
/// # });
/// ```
///
/// Calling [`or_else`](TryFutureExt::or_else) on a successful future has
/// no effect:
///
/// ```
/// use futures::future::TryFutureExt;
///
/// # futures::executor::block_on(async {
/// let future = async { Ok::&lt;i32, i32&gt;(1) };
/// let future = future.or_else(|x| async move { Ok::&lt;i32, i32&gt;(x + 3) });
/// assert_eq!(future.await, Ok(1));
/// # });
/// ```
</span><span class="kw">fn </span>or_else&lt;Fut, F&gt;(<span class="self">self</span>, f: F) -&gt; OrElse&lt;<span class="self">Self</span>, Fut, F&gt;
<span class="kw">where
</span>F: FnOnce(<span class="self">Self</span>::Error) -&gt; Fut,
Fut: TryFuture&lt;<span class="prelude-val">Ok </span>= <span class="self">Self</span>::Ok&gt;,
<span class="self">Self</span>: Sized,
{
assert_future::&lt;<span class="prelude-ty">Result</span>&lt;Fut::Ok, Fut::Error&gt;, <span class="kw">_</span>&gt;(OrElse::new(<span class="self">self</span>, f))
}
<span class="doccomment">/// Do something with the success value of a future before passing it on.
///
/// When using futures, you&#39;ll often chain several of them together. While
/// working on such code, you might want to check out what&#39;s happening at
/// various parts in the pipeline, without consuming the intermediate
/// value. To do that, insert a call to `inspect_ok`.
///
/// # Examples
///
/// ```
/// # futures::executor::block_on(async {
/// use futures::future::TryFutureExt;
///
/// let future = async { Ok::&lt;_, ()&gt;(1) };
/// let new_future = future.inspect_ok(|&amp;x| println!(&quot;about to resolve: {}&quot;, x));
/// assert_eq!(new_future.await, Ok(1));
/// # });
/// ```
</span><span class="kw">fn </span>inspect_ok&lt;F&gt;(<span class="self">self</span>, f: F) -&gt; InspectOk&lt;<span class="self">Self</span>, F&gt;
<span class="kw">where
</span>F: FnOnce(<span class="kw-2">&amp;</span><span class="self">Self</span>::Ok),
<span class="self">Self</span>: Sized,
{
assert_future::&lt;<span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>::Ok, <span class="self">Self</span>::Error&gt;, <span class="kw">_</span>&gt;(InspectOk::new(<span class="self">self</span>, f))
}
<span class="doccomment">/// Do something with the error value of a future before passing it on.
///
/// When using futures, you&#39;ll often chain several of them together. While
/// working on such code, you might want to check out what&#39;s happening at
/// various parts in the pipeline, without consuming the intermediate
/// value. To do that, insert a call to `inspect_err`.
///
/// # Examples
///
/// ```
/// # futures::executor::block_on(async {
/// use futures::future::TryFutureExt;
///
/// let future = async { Err::&lt;(), _&gt;(1) };
/// let new_future = future.inspect_err(|&amp;x| println!(&quot;about to error: {}&quot;, x));
/// assert_eq!(new_future.await, Err(1));
/// # });
/// ```
</span><span class="kw">fn </span>inspect_err&lt;F&gt;(<span class="self">self</span>, f: F) -&gt; InspectErr&lt;<span class="self">Self</span>, F&gt;
<span class="kw">where
</span>F: FnOnce(<span class="kw-2">&amp;</span><span class="self">Self</span>::Error),
<span class="self">Self</span>: Sized,
{
assert_future::&lt;<span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>::Ok, <span class="self">Self</span>::Error&gt;, <span class="kw">_</span>&gt;(InspectErr::new(<span class="self">self</span>, f))
}
<span class="doccomment">/// Flatten the execution of this future when the successful result of this
/// future is another future.
///
/// This is equivalent to `future.and_then(|x| x)`.
</span><span class="kw">fn </span>try_flatten(<span class="self">self</span>) -&gt; TryFlatten&lt;<span class="self">Self</span>, <span class="self">Self</span>::Ok&gt;
<span class="kw">where
</span><span class="self">Self</span>::Ok: TryFuture&lt;Error = <span class="self">Self</span>::Error&gt;,
<span class="self">Self</span>: Sized,
{
assert_future::&lt;<span class="prelude-ty">Result</span>&lt;&lt;<span class="self">Self</span>::Ok <span class="kw">as </span>TryFuture&gt;::Ok, <span class="self">Self</span>::Error&gt;, <span class="kw">_</span>&gt;(TryFlatten::new(<span class="self">self</span>))
}
<span class="doccomment">/// Flatten the execution of this future when the successful result of this
/// future is a stream.
///
/// This can be useful when stream initialization is deferred, and it is
/// convenient to work with that stream as if stream was available at the
/// call site.
///
/// Note that this function consumes this future and returns a wrapped
/// version of it.
///
/// # Examples
///
/// ```
/// # futures::executor::block_on(async {
/// use futures::future::TryFutureExt;
/// use futures::stream::{self, TryStreamExt};
///
/// let stream_items = vec![17, 18, 19].into_iter().map(Ok);
/// let future_of_a_stream = async { Ok::&lt;_, ()&gt;(stream::iter(stream_items)) };
///
/// let stream = future_of_a_stream.try_flatten_stream();
/// let list = stream.try_collect::&lt;Vec&lt;_&gt;&gt;().await;
/// assert_eq!(list, Ok(vec![17, 18, 19]));
/// # });
/// ```
</span><span class="kw">fn </span>try_flatten_stream(<span class="self">self</span>) -&gt; TryFlattenStream&lt;<span class="self">Self</span>&gt;
<span class="kw">where
</span><span class="self">Self</span>::Ok: TryStream&lt;Error = <span class="self">Self</span>::Error&gt;,
<span class="self">Self</span>: Sized,
{
assert_stream::&lt;<span class="prelude-ty">Result</span>&lt;&lt;<span class="self">Self</span>::Ok <span class="kw">as </span>TryStream&gt;::Ok, <span class="self">Self</span>::Error&gt;, <span class="kw">_</span>&gt;(TryFlattenStream::new(
<span class="self">self</span>,
))
}
<span class="doccomment">/// Unwraps this future&#39;s output, producing a future with this future&#39;s
/// [`Ok`](TryFuture::Ok) type as its
/// [`Output`](std::future::Future::Output) type.
///
/// If this future is resolved successfully, the returned future will
/// contain the original future&#39;s success value as output. Otherwise, the
/// closure `f` is called with the error value to produce an alternate
/// success value.
///
/// This method is similar to the [`Result::unwrap_or_else`] method.
///
/// # Examples
///
/// ```
/// use futures::future::TryFutureExt;
///
/// # futures::executor::block_on(async {
/// let future = async { Err::&lt;(), &amp;str&gt;(&quot;Boom!&quot;) };
/// let future = future.unwrap_or_else(|_| ());
/// assert_eq!(future.await, ());
/// # });
/// ```
</span><span class="kw">fn </span>unwrap_or_else&lt;F&gt;(<span class="self">self</span>, f: F) -&gt; UnwrapOrElse&lt;<span class="self">Self</span>, F&gt;
<span class="kw">where
</span><span class="self">Self</span>: Sized,
F: FnOnce(<span class="self">Self</span>::Error) -&gt; <span class="self">Self</span>::Ok,
{
assert_future::&lt;<span class="self">Self</span>::Ok, <span class="kw">_</span>&gt;(UnwrapOrElse::new(<span class="self">self</span>, f))
}
<span class="doccomment">/// Wraps a [`TryFuture`] into a future compatible with libraries using
/// futures 0.1 future definitions. Requires the `compat` feature to enable.
</span><span class="attribute">#[cfg(feature = <span class="string">&quot;compat&quot;</span>)]
#[cfg_attr(docsrs, doc(cfg(feature = <span class="string">&quot;compat&quot;</span>)))]
</span><span class="kw">fn </span>compat(<span class="self">self</span>) -&gt; Compat&lt;<span class="self">Self</span>&gt;
<span class="kw">where
</span><span class="self">Self</span>: Sized + Unpin,
{
Compat::new(<span class="self">self</span>)
}
<span class="doccomment">/// Wraps a [`TryFuture`] into a type that implements
/// [`Future`](std::future::Future).
///
/// [`TryFuture`]s currently do not implement the
/// [`Future`](std::future::Future) trait due to limitations of the
/// compiler.
///
/// # Examples
///
/// ```
/// use futures::future::{Future, TryFuture, TryFutureExt};
///
/// # type T = i32;
/// # type E = ();
/// fn make_try_future() -&gt; impl TryFuture&lt;Ok = T, Error = E&gt; { // ... }
/// # async { Ok::&lt;i32, ()&gt;(1) }
/// # }
/// fn take_future(future: impl Future&lt;Output = Result&lt;T, E&gt;&gt;) { /* ... */ }
///
/// take_future(make_try_future().into_future());
/// ```
</span><span class="kw">fn </span>into_future(<span class="self">self</span>) -&gt; IntoFuture&lt;<span class="self">Self</span>&gt;
<span class="kw">where
</span><span class="self">Self</span>: Sized,
{
assert_future::&lt;<span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>::Ok, <span class="self">Self</span>::Error&gt;, <span class="kw">_</span>&gt;(IntoFuture::new(<span class="self">self</span>))
}
<span class="doccomment">/// A convenience method for calling [`TryFuture::try_poll`] on [`Unpin`]
/// future types.
</span><span class="kw">fn </span>try_poll_unpin(<span class="kw-2">&amp;mut </span><span class="self">self</span>, cx: <span class="kw-2">&amp;mut </span>Context&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; Poll&lt;<span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>::Ok, <span class="self">Self</span>::Error&gt;&gt;
<span class="kw">where
</span><span class="self">Self</span>: Unpin,
{
Pin::new(<span class="self">self</span>).try_poll(cx)
}
}
</code></pre></div>
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