edlang/either/macro.for_both.html
2024-07-26 09:42:18 +00:00

21 lines
4.6 KiB
HTML
Raw Permalink Blame History

This file contains ambiguous Unicode characters

This file contains Unicode characters that might be confused with other characters. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.

<!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="Evaluate the provided expression for both `Either::Left` and `Either::Right`."><title>for_both in either - Rust</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-46f98efaafac5295.ttf.woff2,FiraSans-Regular-018c141bf0843ffd.woff2,FiraSans-Medium-8f9a781e4970d388.woff2,SourceCodePro-Regular-562dcc5011b6de7d.ttf.woff2,SourceCodePro-Semibold-d899c5a5c4aeb14a.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../static.files/normalize-76eba96aa4d2e634.css"><link rel="stylesheet" href="../static.files/rustdoc-dd39b87e5fcfba68.css"><meta name="rustdoc-vars" data-root-path="../" data-static-root-path="../static.files/" data-current-crate="either" data-themes="" data-resource-suffix="" data-rustdoc-version="1.80.0 (051478957 2024-07-21)" data-channel="1.80.0" data-search-js="search-d52510db62a78183.js" data-settings-js="settings-4313503d2e1961c2.js" ><script src="../static.files/storage-118b08c4c78b968e.js"></script><script defer src="sidebar-items.js"></script><script defer src="../static.files/main-20a3ad099b048cf2.js"></script><noscript><link rel="stylesheet" href="../static.files/noscript-df360f571f6edeae.css"></noscript><link rel="alternate icon" type="image/png" href="../static.files/favicon-32x32-422f7d1d52889060.png"><link rel="icon" type="image/svg+xml" href="../static.files/favicon-2c020d218678b618.svg"></head><body class="rustdoc macro"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle" title="show sidebar"></button></nav><nav class="sidebar"><div class="sidebar-crate"><h2><a href="../either/index.html">either</a><span class="version">1.13.0</span></h2></div><div class="sidebar-elems"></div></nav><div class="sidebar-resizer"></div><main><div class="width-limiter"><rustdoc-search></rustdoc-search><section id="main-content" class="content"><div class="main-heading"><h1>Macro <a href="index.html">either</a>::<wbr><a class="macro" href="#">for_both</a><button id="copy-path" title="Copy item path to clipboard">Copy item path</button></h1><span class="out-of-band"><a class="src" href="../src/either/lib.rs.html#81-88">source</a> · <button id="toggle-all-docs" title="collapse all docs">[<span>&#x2212;</span>]</button></span></div><pre class="rust item-decl"><span class="macro">macro_rules!</span> for_both {
(<span class="macro-nonterminal">$value</span>:expr, <span class="macro-nonterminal">$pattern</span>:pat =&gt; <span class="macro-nonterminal">$result</span>:expr) =&gt; { ... };
}</pre><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Evaluate the provided expression for both <a href="enum.Either.html#variant.Left" title="variant either::Either::Left"><code>Either::Left</code></a> and <a href="enum.Either.html#variant.Right" title="variant either::Either::Right"><code>Either::Right</code></a>.</p>
<p>This macro is useful in cases where both sides of <a href="enum.Either.html" title="enum either::Either"><code>Either</code></a> can be interacted with
in the same way even though the dont share the same type.</p>
<p>Syntax: <code>either::for_both!(</code> <em>expression</em> <code>,</code> <em>pattern</em> <code>=&gt;</code> <em>expression</em> <code>)</code></p>
<h2 id="example"><a class="doc-anchor" href="#example">§</a>Example</h2>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>either::Either;
<span class="kw">fn </span>length(owned_or_borrowed: Either&lt;String, <span class="kw-2">&amp;</span><span class="lifetime">'static </span>str&gt;) -&gt; usize {
<span class="macro">either::for_both!</span>(owned_or_borrowed, s =&gt; s.len())
}
<span class="kw">fn </span>main() {
<span class="kw">let </span>borrowed = Either::Right(<span class="string">"Hello world!"</span>);
<span class="kw">let </span>owned = Either::Left(<span class="string">"Hello world!"</span>.to_owned());
<span class="macro">assert_eq!</span>(length(borrowed), <span class="number">12</span>);
<span class="macro">assert_eq!</span>(length(owned), <span class="number">12</span>);
}</code></pre></div>
</div></details></section></div></main></body></html>