| <!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/fns.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>fns.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="kw">use </span>core::fmt::{<span class="self">self</span>, Debug}; |
| <span class="kw">use </span>core::marker::PhantomData; |
| |
| <span class="kw">pub trait </span>FnOnce1<A> { |
| <span class="kw">type </span>Output; |
| <span class="kw">fn </span>call_once(<span class="self">self</span>, arg: A) -> <span class="self">Self</span>::Output; |
| } |
| |
| <span class="kw">impl</span><T, A, R> FnOnce1<A> <span class="kw">for </span>T |
| <span class="kw">where |
| </span>T: FnOnce(A) -> R, |
| { |
| <span class="kw">type </span>Output = R; |
| <span class="kw">fn </span>call_once(<span class="self">self</span>, arg: A) -> R { |
| <span class="self">self</span>(arg) |
| } |
| } |
| |
| <span class="kw">pub trait </span>FnMut1<A>: FnOnce1<A> { |
| <span class="kw">fn </span>call_mut(<span class="kw-2">&mut </span><span class="self">self</span>, arg: A) -> <span class="self">Self</span>::Output; |
| } |
| |
| <span class="kw">impl</span><T, A, R> FnMut1<A> <span class="kw">for </span>T |
| <span class="kw">where |
| </span>T: FnMut(A) -> R, |
| { |
| <span class="kw">fn </span>call_mut(<span class="kw-2">&mut </span><span class="self">self</span>, arg: A) -> R { |
| <span class="self">self</span>(arg) |
| } |
| } |
| |
| <span class="comment">// Not used, but present for completeness |
| </span><span class="attribute">#[allow(unreachable_pub)] |
| </span><span class="kw">pub trait </span>Fn1<A>: FnMut1<A> { |
| <span class="kw">fn </span>call(<span class="kw-2">&</span><span class="self">self</span>, arg: A) -> <span class="self">Self</span>::Output; |
| } |
| |
| <span class="kw">impl</span><T, A, R> Fn1<A> <span class="kw">for </span>T |
| <span class="kw">where |
| </span>T: Fn(A) -> R, |
| { |
| <span class="kw">fn </span>call(<span class="kw-2">&</span><span class="self">self</span>, arg: A) -> R { |
| <span class="self">self</span>(arg) |
| } |
| } |
| |
| <span class="macro">macro_rules! </span>trivial_fn_impls { |
| (<span class="macro-nonterminal">$name</span>:ident <$(<span class="macro-nonterminal">$arg</span>:ident),<span class="kw-2">*</span>> <span class="macro-nonterminal">$t</span>:ty = <span class="macro-nonterminal">$debug</span>:literal) => { |
| <span class="kw">impl</span><$(<span class="macro-nonterminal">$arg</span>),<span class="kw-2">*</span>> Copy <span class="kw">for </span><span class="macro-nonterminal">$t </span>{} |
| <span class="kw">impl</span><$(<span class="macro-nonterminal">$arg</span>),<span class="kw-2">*</span>> Clone <span class="kw">for </span><span class="macro-nonterminal">$t </span>{ |
| <span class="kw">fn </span>clone(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="self">Self </span>{ <span class="kw-2">*</span><span class="self">self </span>} |
| } |
| <span class="kw">impl</span><$(<span class="macro-nonterminal">$arg</span>),<span class="kw-2">*</span>> Debug <span class="kw">for </span><span class="macro-nonterminal">$t </span>{ |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter<<span class="lifetime">'_</span>>) -> fmt::Result { |
| f.write_str(<span class="macro-nonterminal">$debug</span>) |
| } |
| } |
| <span class="kw">impl</span><$(<span class="macro-nonterminal">$arg</span>,)* A> FnMut1<A> <span class="kw">for </span><span class="macro-nonterminal">$t </span><span class="kw">where </span><span class="self">Self</span>: FnOnce1<A> { |
| <span class="kw">fn </span>call_mut(<span class="kw-2">&mut </span><span class="self">self</span>, arg: A) -> <span class="self">Self</span>::Output { |
| <span class="self">self</span>.call_once(arg) |
| } |
| } |
| <span class="kw">impl</span><$(<span class="macro-nonterminal">$arg</span>,)* A> Fn1<A> <span class="kw">for </span><span class="macro-nonterminal">$t </span><span class="kw">where </span><span class="self">Self</span>: FnOnce1<A> { |
| <span class="kw">fn </span>call(<span class="kw-2">&</span><span class="self">self</span>, arg: A) -> <span class="self">Self</span>::Output { |
| <span class="self">self</span>.call_once(arg) |
| } |
| } |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span><span class="macro-nonterminal">$name</span><$(<span class="macro-nonterminal">$arg</span>),<span class="kw-2">*</span>>() -> <span class="macro-nonterminal">$t </span>{ |
| Default::default() |
| } |
| } |
| } |
| |
| <span class="kw">pub struct </span>OkFn<E>(PhantomData<<span class="kw">fn</span>(E)>); |
| |
| <span class="kw">impl</span><E> Default <span class="kw">for </span>OkFn<E> { |
| <span class="kw">fn </span>default() -> <span class="self">Self </span>{ |
| <span class="self">Self</span>(PhantomData) |
| } |
| } |
| |
| <span class="kw">impl</span><A, E> FnOnce1<A> <span class="kw">for </span>OkFn<E> { |
| <span class="kw">type </span>Output = <span class="prelude-ty">Result</span><A, E>; |
| <span class="kw">fn </span>call_once(<span class="self">self</span>, arg: A) -> <span class="self">Self</span>::Output { |
| <span class="prelude-val">Ok</span>(arg) |
| } |
| } |
| |
| <span class="macro">trivial_fn_impls!</span>(ok_fn <T> OkFn<T> = <span class="string">"Ok"</span>); |
| |
| <span class="attribute">#[derive(Debug, Copy, Clone, Default)] |
| </span><span class="kw">pub struct </span>ChainFn<F, G>(F, G); |
| |
| <span class="kw">impl</span><F, G, A> FnOnce1<A> <span class="kw">for </span>ChainFn<F, G> |
| <span class="kw">where |
| </span>F: FnOnce1<A>, |
| G: FnOnce1<F::Output>, |
| { |
| <span class="kw">type </span>Output = G::Output; |
| <span class="kw">fn </span>call_once(<span class="self">self</span>, arg: A) -> <span class="self">Self</span>::Output { |
| <span class="self">self</span>.<span class="number">1</span>.call_once(<span class="self">self</span>.<span class="number">0</span>.call_once(arg)) |
| } |
| } |
| <span class="kw">impl</span><F, G, A> FnMut1<A> <span class="kw">for </span>ChainFn<F, G> |
| <span class="kw">where |
| </span>F: FnMut1<A>, |
| G: FnMut1<F::Output>, |
| { |
| <span class="kw">fn </span>call_mut(<span class="kw-2">&mut </span><span class="self">self</span>, arg: A) -> <span class="self">Self</span>::Output { |
| <span class="self">self</span>.<span class="number">1</span>.call_mut(<span class="self">self</span>.<span class="number">0</span>.call_mut(arg)) |
| } |
| } |
| <span class="kw">impl</span><F, G, A> Fn1<A> <span class="kw">for </span>ChainFn<F, G> |
| <span class="kw">where |
| </span>F: Fn1<A>, |
| G: Fn1<F::Output>, |
| { |
| <span class="kw">fn </span>call(<span class="kw-2">&</span><span class="self">self</span>, arg: A) -> <span class="self">Self</span>::Output { |
| <span class="self">self</span>.<span class="number">1</span>.call(<span class="self">self</span>.<span class="number">0</span>.call(arg)) |
| } |
| } |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>chain_fn<F, G>(f: F, g: G) -> ChainFn<F, G> { |
| ChainFn(f, g) |
| } |
| |
| <span class="attribute">#[derive(Default)] |
| </span><span class="kw">pub struct </span>MergeResultFn; |
| |
| <span class="kw">impl</span><T> FnOnce1<<span class="prelude-ty">Result</span><T, T>> <span class="kw">for </span>MergeResultFn { |
| <span class="kw">type </span>Output = T; |
| <span class="kw">fn </span>call_once(<span class="self">self</span>, arg: <span class="prelude-ty">Result</span><T, T>) -> <span class="self">Self</span>::Output { |
| <span class="kw">match </span>arg { |
| <span class="prelude-val">Ok</span>(x) => x, |
| <span class="prelude-val">Err</span>(x) => x, |
| } |
| } |
| } |
| <span class="macro">trivial_fn_impls!</span>(merge_result_fn <> MergeResultFn = <span class="string">"merge_result"</span>); |
| |
| <span class="attribute">#[derive(Debug, Copy, Clone, Default)] |
| </span><span class="kw">pub struct </span>InspectFn<F>(F); |
| |
| <span class="attribute">#[allow(single_use_lifetimes)] </span><span class="comment">// https://github.com/rust-lang/rust/issues/55058 |
| </span><span class="kw">impl</span><F, A> FnOnce1<A> <span class="kw">for </span>InspectFn<F> |
| <span class="kw">where |
| </span>F: <span class="kw">for</span><<span class="lifetime">'a</span>> FnOnce1<<span class="kw-2">&</span><span class="lifetime">'a </span>A, Output = ()>, |
| { |
| <span class="kw">type </span>Output = A; |
| <span class="kw">fn </span>call_once(<span class="self">self</span>, arg: A) -> <span class="self">Self</span>::Output { |
| <span class="self">self</span>.<span class="number">0</span>.call_once(<span class="kw-2">&</span>arg); |
| arg |
| } |
| } |
| <span class="attribute">#[allow(single_use_lifetimes)] </span><span class="comment">// https://github.com/rust-lang/rust/issues/55058 |
| </span><span class="kw">impl</span><F, A> FnMut1<A> <span class="kw">for </span>InspectFn<F> |
| <span class="kw">where |
| </span>F: <span class="kw">for</span><<span class="lifetime">'a</span>> FnMut1<<span class="kw-2">&</span><span class="lifetime">'a </span>A, Output = ()>, |
| { |
| <span class="kw">fn </span>call_mut(<span class="kw-2">&mut </span><span class="self">self</span>, arg: A) -> <span class="self">Self</span>::Output { |
| <span class="self">self</span>.<span class="number">0</span>.call_mut(<span class="kw-2">&</span>arg); |
| arg |
| } |
| } |
| <span class="attribute">#[allow(single_use_lifetimes)] </span><span class="comment">// https://github.com/rust-lang/rust/issues/55058 |
| </span><span class="kw">impl</span><F, A> Fn1<A> <span class="kw">for </span>InspectFn<F> |
| <span class="kw">where |
| </span>F: <span class="kw">for</span><<span class="lifetime">'a</span>> Fn1<<span class="kw-2">&</span><span class="lifetime">'a </span>A, Output = ()>, |
| { |
| <span class="kw">fn </span>call(<span class="kw-2">&</span><span class="self">self</span>, arg: A) -> <span class="self">Self</span>::Output { |
| <span class="self">self</span>.<span class="number">0</span>.call(<span class="kw-2">&</span>arg); |
| arg |
| } |
| } |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>inspect_fn<F>(f: F) -> InspectFn<F> { |
| InspectFn(f) |
| } |
| |
| <span class="attribute">#[derive(Debug, Copy, Clone, Default)] |
| </span><span class="kw">pub struct </span>MapOkFn<F>(F); |
| |
| <span class="kw">impl</span><F, T, E> FnOnce1<<span class="prelude-ty">Result</span><T, E>> <span class="kw">for </span>MapOkFn<F> |
| <span class="kw">where |
| </span>F: FnOnce1<T>, |
| { |
| <span class="kw">type </span>Output = <span class="prelude-ty">Result</span><F::Output, E>; |
| <span class="kw">fn </span>call_once(<span class="self">self</span>, arg: <span class="prelude-ty">Result</span><T, E>) -> <span class="self">Self</span>::Output { |
| arg.map(|x| <span class="self">self</span>.<span class="number">0</span>.call_once(x)) |
| } |
| } |
| <span class="kw">impl</span><F, T, E> FnMut1<<span class="prelude-ty">Result</span><T, E>> <span class="kw">for </span>MapOkFn<F> |
| <span class="kw">where |
| </span>F: FnMut1<T>, |
| { |
| <span class="kw">fn </span>call_mut(<span class="kw-2">&mut </span><span class="self">self</span>, arg: <span class="prelude-ty">Result</span><T, E>) -> <span class="self">Self</span>::Output { |
| arg.map(|x| <span class="self">self</span>.<span class="number">0</span>.call_mut(x)) |
| } |
| } |
| <span class="kw">impl</span><F, T, E> Fn1<<span class="prelude-ty">Result</span><T, E>> <span class="kw">for </span>MapOkFn<F> |
| <span class="kw">where |
| </span>F: Fn1<T>, |
| { |
| <span class="kw">fn </span>call(<span class="kw-2">&</span><span class="self">self</span>, arg: <span class="prelude-ty">Result</span><T, E>) -> <span class="self">Self</span>::Output { |
| arg.map(|x| <span class="self">self</span>.<span class="number">0</span>.call(x)) |
| } |
| } |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>map_ok_fn<F>(f: F) -> MapOkFn<F> { |
| MapOkFn(f) |
| } |
| |
| <span class="attribute">#[derive(Debug, Copy, Clone, Default)] |
| </span><span class="kw">pub struct </span>MapErrFn<F>(F); |
| |
| <span class="kw">impl</span><F, T, E> FnOnce1<<span class="prelude-ty">Result</span><T, E>> <span class="kw">for </span>MapErrFn<F> |
| <span class="kw">where |
| </span>F: FnOnce1<E>, |
| { |
| <span class="kw">type </span>Output = <span class="prelude-ty">Result</span><T, F::Output>; |
| <span class="kw">fn </span>call_once(<span class="self">self</span>, arg: <span class="prelude-ty">Result</span><T, E>) -> <span class="self">Self</span>::Output { |
| arg.map_err(|x| <span class="self">self</span>.<span class="number">0</span>.call_once(x)) |
| } |
| } |
| <span class="kw">impl</span><F, T, E> FnMut1<<span class="prelude-ty">Result</span><T, E>> <span class="kw">for </span>MapErrFn<F> |
| <span class="kw">where |
| </span>F: FnMut1<E>, |
| { |
| <span class="kw">fn </span>call_mut(<span class="kw-2">&mut </span><span class="self">self</span>, arg: <span class="prelude-ty">Result</span><T, E>) -> <span class="self">Self</span>::Output { |
| arg.map_err(|x| <span class="self">self</span>.<span class="number">0</span>.call_mut(x)) |
| } |
| } |
| <span class="kw">impl</span><F, T, E> Fn1<<span class="prelude-ty">Result</span><T, E>> <span class="kw">for </span>MapErrFn<F> |
| <span class="kw">where |
| </span>F: Fn1<E>, |
| { |
| <span class="kw">fn </span>call(<span class="kw-2">&</span><span class="self">self</span>, arg: <span class="prelude-ty">Result</span><T, E>) -> <span class="self">Self</span>::Output { |
| arg.map_err(|x| <span class="self">self</span>.<span class="number">0</span>.call(x)) |
| } |
| } |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>map_err_fn<F>(f: F) -> MapErrFn<F> { |
| MapErrFn(f) |
| } |
| |
| <span class="attribute">#[derive(Debug, Copy, Clone)] |
| </span><span class="kw">pub struct </span>InspectOkFn<F>(F); |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, F, T, E> FnOnce1<<span class="kw-2">&</span><span class="lifetime">'a </span><span class="prelude-ty">Result</span><T, E>> <span class="kw">for </span>InspectOkFn<F> |
| <span class="kw">where |
| </span>F: FnOnce1<<span class="kw-2">&</span><span class="lifetime">'a </span>T, Output = ()>, |
| { |
| <span class="kw">type </span>Output = (); |
| <span class="kw">fn </span>call_once(<span class="self">self</span>, arg: <span class="kw-2">&</span><span class="lifetime">'a </span><span class="prelude-ty">Result</span><T, E>) -> <span class="self">Self</span>::Output { |
| <span class="kw">if let </span><span class="prelude-val">Ok</span>(x) = arg { |
| <span class="self">self</span>.<span class="number">0</span>.call_once(x) |
| } |
| } |
| } |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, F, T, E> FnMut1<<span class="kw-2">&</span><span class="lifetime">'a </span><span class="prelude-ty">Result</span><T, E>> <span class="kw">for </span>InspectOkFn<F> |
| <span class="kw">where |
| </span>F: FnMut1<<span class="kw-2">&</span><span class="lifetime">'a </span>T, Output = ()>, |
| { |
| <span class="kw">fn </span>call_mut(<span class="kw-2">&mut </span><span class="self">self</span>, arg: <span class="kw-2">&</span><span class="lifetime">'a </span><span class="prelude-ty">Result</span><T, E>) -> <span class="self">Self</span>::Output { |
| <span class="kw">if let </span><span class="prelude-val">Ok</span>(x) = arg { |
| <span class="self">self</span>.<span class="number">0</span>.call_mut(x) |
| } |
| } |
| } |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, F, T, E> Fn1<<span class="kw-2">&</span><span class="lifetime">'a </span><span class="prelude-ty">Result</span><T, E>> <span class="kw">for </span>InspectOkFn<F> |
| <span class="kw">where |
| </span>F: Fn1<<span class="kw-2">&</span><span class="lifetime">'a </span>T, Output = ()>, |
| { |
| <span class="kw">fn </span>call(<span class="kw-2">&</span><span class="self">self</span>, arg: <span class="kw-2">&</span><span class="lifetime">'a </span><span class="prelude-ty">Result</span><T, E>) -> <span class="self">Self</span>::Output { |
| <span class="kw">if let </span><span class="prelude-val">Ok</span>(x) = arg { |
| <span class="self">self</span>.<span class="number">0</span>.call(x) |
| } |
| } |
| } |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>inspect_ok_fn<F>(f: F) -> InspectOkFn<F> { |
| InspectOkFn(f) |
| } |
| |
| <span class="attribute">#[derive(Debug, Copy, Clone)] |
| </span><span class="kw">pub struct </span>InspectErrFn<F>(F); |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, F, T, E> FnOnce1<<span class="kw-2">&</span><span class="lifetime">'a </span><span class="prelude-ty">Result</span><T, E>> <span class="kw">for </span>InspectErrFn<F> |
| <span class="kw">where |
| </span>F: FnOnce1<<span class="kw-2">&</span><span class="lifetime">'a </span>E, Output = ()>, |
| { |
| <span class="kw">type </span>Output = (); |
| <span class="kw">fn </span>call_once(<span class="self">self</span>, arg: <span class="kw-2">&</span><span class="lifetime">'a </span><span class="prelude-ty">Result</span><T, E>) -> <span class="self">Self</span>::Output { |
| <span class="kw">if let </span><span class="prelude-val">Err</span>(x) = arg { |
| <span class="self">self</span>.<span class="number">0</span>.call_once(x) |
| } |
| } |
| } |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, F, T, E> FnMut1<<span class="kw-2">&</span><span class="lifetime">'a </span><span class="prelude-ty">Result</span><T, E>> <span class="kw">for </span>InspectErrFn<F> |
| <span class="kw">where |
| </span>F: FnMut1<<span class="kw-2">&</span><span class="lifetime">'a </span>E, Output = ()>, |
| { |
| <span class="kw">fn </span>call_mut(<span class="kw-2">&mut </span><span class="self">self</span>, arg: <span class="kw-2">&</span><span class="lifetime">'a </span><span class="prelude-ty">Result</span><T, E>) -> <span class="self">Self</span>::Output { |
| <span class="kw">if let </span><span class="prelude-val">Err</span>(x) = arg { |
| <span class="self">self</span>.<span class="number">0</span>.call_mut(x) |
| } |
| } |
| } |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, F, T, E> Fn1<<span class="kw-2">&</span><span class="lifetime">'a </span><span class="prelude-ty">Result</span><T, E>> <span class="kw">for </span>InspectErrFn<F> |
| <span class="kw">where |
| </span>F: Fn1<<span class="kw-2">&</span><span class="lifetime">'a </span>E, Output = ()>, |
| { |
| <span class="kw">fn </span>call(<span class="kw-2">&</span><span class="self">self</span>, arg: <span class="kw-2">&</span><span class="lifetime">'a </span><span class="prelude-ty">Result</span><T, E>) -> <span class="self">Self</span>::Output { |
| <span class="kw">if let </span><span class="prelude-val">Err</span>(x) = arg { |
| <span class="self">self</span>.<span class="number">0</span>.call(x) |
| } |
| } |
| } |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>inspect_err_fn<F>(f: F) -> InspectErrFn<F> { |
| InspectErrFn(f) |
| } |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">type </span>MapOkOrElseFn<F, G> = ChainFn<MapOkFn<F>, ChainFn<MapErrFn<G>, MergeResultFn>>; |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>map_ok_or_else_fn<F, G>(f: F, g: G) -> MapOkOrElseFn<F, G> { |
| chain_fn(map_ok_fn(f), chain_fn(map_err_fn(g), merge_result_fn())) |
| } |
| |
| <span class="attribute">#[derive(Debug, Copy, Clone, Default)] |
| </span><span class="kw">pub struct </span>UnwrapOrElseFn<F>(F); |
| |
| <span class="kw">impl</span><F, T, E> FnOnce1<<span class="prelude-ty">Result</span><T, E>> <span class="kw">for </span>UnwrapOrElseFn<F> |
| <span class="kw">where |
| </span>F: FnOnce1<E, Output = T>, |
| { |
| <span class="kw">type </span>Output = T; |
| <span class="kw">fn </span>call_once(<span class="self">self</span>, arg: <span class="prelude-ty">Result</span><T, E>) -> <span class="self">Self</span>::Output { |
| arg.unwrap_or_else(|x| <span class="self">self</span>.<span class="number">0</span>.call_once(x)) |
| } |
| } |
| <span class="kw">impl</span><F, T, E> FnMut1<<span class="prelude-ty">Result</span><T, E>> <span class="kw">for </span>UnwrapOrElseFn<F> |
| <span class="kw">where |
| </span>F: FnMut1<E, Output = T>, |
| { |
| <span class="kw">fn </span>call_mut(<span class="kw-2">&mut </span><span class="self">self</span>, arg: <span class="prelude-ty">Result</span><T, E>) -> <span class="self">Self</span>::Output { |
| arg.unwrap_or_else(|x| <span class="self">self</span>.<span class="number">0</span>.call_mut(x)) |
| } |
| } |
| <span class="kw">impl</span><F, T, E> Fn1<<span class="prelude-ty">Result</span><T, E>> <span class="kw">for </span>UnwrapOrElseFn<F> |
| <span class="kw">where |
| </span>F: Fn1<E, Output = T>, |
| { |
| <span class="kw">fn </span>call(<span class="kw-2">&</span><span class="self">self</span>, arg: <span class="prelude-ty">Result</span><T, E>) -> <span class="self">Self</span>::Output { |
| arg.unwrap_or_else(|x| <span class="self">self</span>.<span class="number">0</span>.call(x)) |
| } |
| } |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>unwrap_or_else_fn<F>(f: F) -> UnwrapOrElseFn<F> { |
| UnwrapOrElseFn(f) |
| } |
| |
| <span class="kw">pub struct </span>IntoFn<T>(PhantomData<<span class="kw">fn</span>() -> T>); |
| |
| <span class="kw">impl</span><T> Default <span class="kw">for </span>IntoFn<T> { |
| <span class="kw">fn </span>default() -> <span class="self">Self </span>{ |
| <span class="self">Self</span>(PhantomData) |
| } |
| } |
| <span class="kw">impl</span><A, T> FnOnce1<A> <span class="kw">for </span>IntoFn<T> |
| <span class="kw">where |
| </span>A: Into<T>, |
| { |
| <span class="kw">type </span>Output = T; |
| <span class="kw">fn </span>call_once(<span class="self">self</span>, arg: A) -> <span class="self">Self</span>::Output { |
| arg.into() |
| } |
| } |
| |
| <span class="macro">trivial_fn_impls!</span>(into_fn <T> IntoFn<T> = <span class="string">"Into::into"</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> |
