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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="Parse a set of arguments into a user-defined container."><meta name="keywords" content="rust, rustlang, rust-lang, Args"><title>Args in clap - Rust</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" type="text/css" href="../normalize.css"><link rel="stylesheet" type="text/css" href="../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../ayu.css" disabled><link rel="stylesheet" type="text/css" href="../dark.css" disabled><link rel="stylesheet" type="text/css" href="../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../storage.js"></script><script src="../crates.js"></script><script defer src="../main.js"></script>
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<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 trait"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu" role="button">☰</div><a class="sidebar-logo" href="../clap/index.html"><div class="logo-container"><img src="https://raw.githubusercontent.com/clap-rs/clap/master/assets/clap.png" alt="logo"></div>
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</a><h2 class="location">Trait Args</h2><div class="sidebar-elems"><div class="block items"><h3 class="sidebar-title"><a href="#required-methods">Required Methods</a></h3><div class="sidebar-links"><a href="#tymethod.augment_args">augment_args</a><a href="#tymethod.augment_args_for_update">augment_args_for_update</a></div><h3 class="sidebar-title"><a href="#foreign-impls">Implementations on Foreign Types</a></h3><div class="sidebar-links"><a href="#impl-Args-for-Box%3CT%3E">Box<T></a></div><h3 class="sidebar-title"><a href="#implementors">Implementors</a></h3></div><h2 class="location">Other items in<br><a href="index.html">clap</a></h2><div id="sidebar-vars" data-name="Args" data-ty="trait" data-relpath=""></div><script defer src="sidebar-items.js"></script></div></nav><main><div class="width-limiter"><div class="sub-container"><a class="sub-logo-container" href="../clap/index.html"><img src="https://raw.githubusercontent.com/clap-rs/clap/master/assets/clap.png" alt="logo"></a><nav class="sub"><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!" aria-haspopup="menu" title="themes"><img width="18" height="18" alt="Pick another theme!" src="../brush.svg"></button><div id="theme-choices" role="menu"></div></div><form class="search-form"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><button type="button" id="help-button" title="help">?</button><a id="settings-menu" href="../settings.html" title="settings"><img width="18" height="18" alt="Change settings" src="../wheel.svg"></a></div></form></nav></div><section id="main-content" class="content"><h1 class="fqn"><span class="in-band">Trait <a href="index.html">clap</a>::<wbr><a class="trait" href="#">Args</a><button id="copy-path" onclick="copy_path(this)" title="Copy item path to clipboard"><img src="../clipboard.svg" width="19" height="18" alt="Copy item path"></button></span><span class="out-of-band"><span id="render-detail"><a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">−</span>]</a></span><a class="srclink" href="../src/clap/derive.rs.html#330-341" title="goto source code">[src]</a></span></h1><div class="docblock item-decl"><pre class="rust trait"><code>pub trait Args: <a class="trait" href="trait.FromArgMatches.html" title="trait clap::FromArgMatches">FromArgMatches</a> + <a class="trait" href="https://doc.rust-lang.org/1.59.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a> {
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fn <a href="#tymethod.augment_args" class="fnname">augment_args</a>(cmd: <a class="type" href="type.Command.html" title="type clap::Command">Command</a><'_>) -> <a class="type" href="type.Command.html" title="type clap::Command">Command</a><'_>;
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<div class="item-spacer"></div> fn <a href="#tymethod.augment_args_for_update" class="fnname">augment_args_for_update</a>(cmd: <a class="type" href="type.Command.html" title="type clap::Command">Command</a><'_>) -> <a class="type" href="type.Command.html" title="type clap::Command">Command</a><'_>;
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}</code></pre></div><details class="rustdoc-toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Parse a set of arguments into a user-defined container.</p>
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<p>Implementing this trait lets a parent container delegate argument parsing behavior to <code>Self</code>.
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with:</p>
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<ul>
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<li><code>#[clap(flatten)] args: ChildArgs</code>: Attribute can only be used with struct fields that impl
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<code>Args</code>.</li>
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<li><code>Variant(ChildArgs)</code>: No attribute is used with enum variants that impl <code>Args</code>.</li>
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</ul>
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<p>See the
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<a href="https://github.com/clap-rs/clap/blob/v3.1.6/examples/derive_ref/README.md">derive reference</a>
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for attributes and best practices.</p>
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<p><strong>NOTE:</strong> Deriving requires the <code>derive</code> feature flag</p>
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<h2 id="example" class="section-header"><a href="#example">Example</a></h2>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="attribute">#[<span class="ident">derive</span>(<span class="ident">clap::Parser</span>)]</span>
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<span class="kw">struct</span> <span class="ident">Args</span> {
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<span class="attribute">#[<span class="ident">clap</span>(<span class="ident">flatten</span>)]</span>
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<span class="ident">logging</span>: <span class="ident">LogArgs</span>,
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}
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<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">clap::Args</span>)]</span>
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<span class="kw">struct</span> <span class="ident">LogArgs</span> {
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<span class="attribute">#[<span class="ident">clap</span>(<span class="ident">long</span>, <span class="ident">short</span> <span class="op">=</span> <span class="string">'v'</span>, <span class="ident">parse</span>(<span class="ident">from_occurrences</span>))]</span>
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<span class="ident">verbose</span>: <span class="ident">i8</span>,
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}</code></pre></div>
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</div></details><h2 id="required-methods" class="small-section-header">Required methods<a href="#required-methods" class="anchor"></a></h2><div class="methods"><details class="rustdoc-toggle" open><summary><div id="tymethod.augment_args" class="method has-srclink"><div class="rightside"><a class="srclink" href="../src/clap/derive.rs.html#334" title="goto source code">[src]</a></div><h4 class="code-header">fn <a href="#tymethod.augment_args" class="fnname">augment_args</a>(cmd: <a class="type" href="type.Command.html" title="type clap::Command">Command</a><'_>) -> <a class="type" href="type.Command.html" title="type clap::Command">Command</a><'_></h4></div></summary><div class="docblock"><p>Append to <a href="type.Command.html" title="Command"><code>Command</code></a> so it can instantiate <code>Self</code>.</p>
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<p>See also <a href="trait.CommandFactory.html" title="CommandFactory"><code>CommandFactory</code></a>.</p>
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</div></details><details class="rustdoc-toggle" open><summary><div id="tymethod.augment_args_for_update" class="method has-srclink"><div class="rightside"><a class="srclink" href="../src/clap/derive.rs.html#340" title="goto source code">[src]</a></div><h4 class="code-header">fn <a href="#tymethod.augment_args_for_update" class="fnname">augment_args_for_update</a>(cmd: <a class="type" href="type.Command.html" title="type clap::Command">Command</a><'_>) -> <a class="type" href="type.Command.html" title="type clap::Command">Command</a><'_></h4></div></summary><div class="docblock"><p>Append to <a href="type.Command.html" title="Command"><code>Command</code></a> so it can update <code>self</code>.</p>
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<p>This is used to implement <code>#[clap(flatten)]</code></p>
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<p>See also <a href="trait.CommandFactory.html" title="CommandFactory"><code>CommandFactory</code></a>.</p>
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</div></details></div><h2 id="foreign-impls" class="small-section-header">Implementations on Foreign Types<a href="#foreign-impls" class="anchor"></a></h2><details class="rustdoc-toggle implementors-toggle"><summary><div id="impl-Args-for-Box%3CT%3E" class="impl has-srclink"><div class="rightside"><a class="srclink" href="../src/clap/derive.rs.html#488-495" title="goto source code">[src]</a></div><a href="#impl-Args-for-Box%3CT%3E" class="anchor"></a><h3 class="code-header in-band">impl<T: <a class="trait" href="trait.Args.html" title="trait clap::Args">Args</a>> <a class="trait" href="trait.Args.html" title="trait clap::Args">Args</a> for <a class="struct" href="https://doc.rust-lang.org/1.59.0/alloc/boxed/struct.Box.html" title="struct alloc::boxed::Box">Box</a><T></h3></div></summary><div class="impl-items"><div id="method.augment_args" class="method trait-impl has-srclink"><div class="rightside"><a class="srclink" href="../src/clap/derive.rs.html#489-491" title="goto source code">[src]</a></div><a href="#method.augment_args" class="anchor"></a><h4 class="code-header">fn <a href="#tymethod.augment_args" class="fnname">augment_args</a>(cmd: <a class="type" href="type.Command.html" title="type clap::Command">Command</a><'_>) -> <a class="type" href="type.Command.html" title="type clap::Command">Command</a><'_></h4></div><div id="method.augment_args_for_update" class="method trait-impl has-srclink"><div class="rightside"><a class="srclink" href="../src/clap/derive.rs.html#492-494" title="goto source code">[src]</a></div><a href="#method.augment_args_for_update" class="anchor"></a><h4 class="code-header">fn <a href="#tymethod.augment_args_for_update" class="fnname">augment_args_for_update</a>(cmd: <a class="type" href="type.Command.html" title="type clap::Command">Command</a><'_>) -> <a class="type" href="type.Command.html" title="type clap::Command">Command</a><'_></h4></div></div></details><h2 id="implementors" class="small-section-header">Implementors<a href="#implementors" class="anchor"></a></h2><div class="item-list" id="implementors-list"></div><script type="text/javascript" src="../implementors/clap/trait.Args.js" async></script></section><section id="search" class="content hidden"></section></div></main><div id="rustdoc-vars" data-root-path="../" data-current-crate="clap" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.59.0 (9d1b2106e 2022-02-23)" ></div>
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