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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 command-line arguments into `Self`."><meta name="keywords" content="rust, rustlang, rust-lang, Parser"><title>Parser 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 defer src="sidebar-items.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 trait"><!--[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">&#9776;</button><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></a><h2 class="location"></h2></nav><nav class="sidebar"><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></a><h2 class="location"><a href="#">Parser</a></h2><div class="sidebar-elems"><section><div class="block"><h3 class="sidebar-title"><a href="#provided-methods">Provided Methods</a></h3><ul><li><a href="#method.parse">parse</a></li><li><a href="#method.parse_from">parse_from</a></li><li><a href="#method.try_parse">try_parse</a></li><li><a href="#method.try_parse_from">try_parse_from</a></li><li><a href="#method.try_update_from">try_update_from</a></li><li><a href="#method.update_from">update_from</a></li></ul></div><div class="block"><h3 class="sidebar-title"><a href="#foreign-impls">Implementations on Foreign Types</a></h3><ul><li><a href="#impl-Parser-for-Box%3CT%3E">Box&lt;T&gt;</a></li></ul></div><div class="block"><h3 class="sidebar-title"><a href="#implementors">Implementors</a></h3></div></section><h2 class="location"><a href="index.html">In clap</a></h2></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"><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"><button type="button">?</button></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></div><section id="main-content" class="content"><div class="main-heading"><h1 class="fqn"><span class="in-band">Trait <a href="index.html">clap</a>::<wbr><a class="trait" href="#">Parser</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></h1><span class="out-of-band"><a class="srclink" href="../src/clap/derive.rs.html#79-157">source</a> · <a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">&#x2212;</span>]</a></span></div><div class="docblock item-decl"><pre class="rust trait"><code>pub trait Parser: <a class="trait" href="trait.FromArgMatches.html" title="trait clap::FromArgMatches">FromArgMatches</a> + <a class="trait" href="trait.CommandFactory.html" title="trait clap::CommandFactory">CommandFactory</a> + <a class="trait" href="https://doc.rust-lang.org/1.64.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a> {
fn <a href="#method.parse" class="fnname">parse</a>() -&gt; Self { ... }
<span class="item-spacer"></span> fn <a href="#method.try_parse" class="fnname">try_parse</a>() -&gt; <a class="enum" href="https://doc.rust-lang.org/1.64.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;Self, <a class="type" href="type.Error.html" title="type clap::Error">Error</a>&gt; { ... }
<span class="item-spacer"></span> fn <a href="#method.parse_from" class="fnname">parse_from</a>&lt;I, T&gt;(itr: I) -&gt; Self<br>&nbsp;&nbsp;&nbsp; <span class="where">where<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;I: <a class="trait" href="https://doc.rust-lang.org/1.64.0/core/iter/traits/collect/trait.IntoIterator.html" title="trait core::iter::traits::collect::IntoIterator">IntoIterator</a>&lt;Item = T&gt;,<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;T: <a class="trait" href="https://doc.rust-lang.org/1.64.0/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a>&lt;<a class="struct" href="https://doc.rust-lang.org/1.64.0/std/ffi/os_str/struct.OsString.html" title="struct std::ffi::os_str::OsString">OsString</a>&gt; + <a class="trait" href="https://doc.rust-lang.org/1.64.0/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a></span>,
{ ... }
<span class="item-spacer"></span> fn <a href="#method.try_parse_from" class="fnname">try_parse_from</a>&lt;I, T&gt;(itr: I) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.64.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;Self, <a class="type" href="type.Error.html" title="type clap::Error">Error</a>&gt;<br>&nbsp;&nbsp;&nbsp; <span class="where">where<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;I: <a class="trait" href="https://doc.rust-lang.org/1.64.0/core/iter/traits/collect/trait.IntoIterator.html" title="trait core::iter::traits::collect::IntoIterator">IntoIterator</a>&lt;Item = T&gt;,<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;T: <a class="trait" href="https://doc.rust-lang.org/1.64.0/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a>&lt;<a class="struct" href="https://doc.rust-lang.org/1.64.0/std/ffi/os_str/struct.OsString.html" title="struct std::ffi::os_str::OsString">OsString</a>&gt; + <a class="trait" href="https://doc.rust-lang.org/1.64.0/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a></span>,
{ ... }
<span class="item-spacer"></span> fn <a href="#method.update_from" class="fnname">update_from</a>&lt;I, T&gt;(&amp;mut self, itr: I)<br>&nbsp;&nbsp;&nbsp; <span class="where">where<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;I: <a class="trait" href="https://doc.rust-lang.org/1.64.0/core/iter/traits/collect/trait.IntoIterator.html" title="trait core::iter::traits::collect::IntoIterator">IntoIterator</a>&lt;Item = T&gt;,<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;T: <a class="trait" href="https://doc.rust-lang.org/1.64.0/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a>&lt;<a class="struct" href="https://doc.rust-lang.org/1.64.0/std/ffi/os_str/struct.OsString.html" title="struct std::ffi::os_str::OsString">OsString</a>&gt; + <a class="trait" href="https://doc.rust-lang.org/1.64.0/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a></span>,
{ ... }
<span class="item-spacer"></span> fn <a href="#method.try_update_from" class="fnname">try_update_from</a>&lt;I, T&gt;(&amp;mut self, itr: I) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.64.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.64.0/std/primitive.unit.html">()</a>, <a class="type" href="type.Error.html" title="type clap::Error">Error</a>&gt;<br>&nbsp;&nbsp;&nbsp; <span class="where">where<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;I: <a class="trait" href="https://doc.rust-lang.org/1.64.0/core/iter/traits/collect/trait.IntoIterator.html" title="trait core::iter::traits::collect::IntoIterator">IntoIterator</a>&lt;Item = T&gt;,<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;T: <a class="trait" href="https://doc.rust-lang.org/1.64.0/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a>&lt;<a class="struct" href="https://doc.rust-lang.org/1.64.0/std/ffi/os_str/struct.OsString.html" title="struct std::ffi::os_str::OsString">OsString</a>&gt; + <a class="trait" href="https://doc.rust-lang.org/1.64.0/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a></span>,
{ ... }
}</code></pre></div><details class="rustdoc-toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Parse command-line arguments into <code>Self</code>.</p>
<p>The primary one-stop-shop trait used to create an instance of a <code>clap</code>
<a href="builder/struct.Command.html" title="Command"><code>Command</code></a>, conduct the parsing, and turn the resulting <a href="parser/struct.ArgMatches.html" title="ArgMatches"><code>ArgMatches</code></a> back
into concrete instance of the user struct.</p>
<p>This trait is primarily a convenience on top of <a href="trait.FromArgMatches.html" title="FromArgMatches"><code>FromArgMatches</code></a> +
<a href="trait.CommandFactory.html" title="CommandFactory"><code>CommandFactory</code></a> which uses those two underlying traits to build the two
fundamental functions <code>parse</code> which uses the <code>std::env::args_os</code> iterator,
and <code>parse_from</code> which allows the consumer to supply the iterator (along
with fallible options for each).</p>
<p>See also <a href="trait.Subcommand.html" title="Subcommand"><code>Subcommand</code></a> and <a href="trait.Args.html" title="Args"><code>Args</code></a>.</p>
<p>See the <a href="crate::_derive">derive reference</a> for attributes and best practices.</p>
<p><strong>NOTE:</strong> Deriving requires the [<code>derive</code> feature flag][crate::_features]</p>
<h2 id="examples"><a href="#examples">Examples</a></h2>
<p>The following example creates a <code>Context</code> struct that would be used
throughout the application representing the normalized values coming from
the CLI.</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="doccomment">/// My super CLI</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">clap::Parser</span>)]</span>
<span class="attribute">#[<span class="ident">command</span>(<span class="ident">name</span> <span class="op">=</span> <span class="string">&quot;demo&quot;</span>)]</span>
<span class="kw">struct</span> <span class="ident">Context</span> {
<span class="doccomment">/// More verbose output</span>
<span class="attribute">#[<span class="ident">arg</span>(<span class="ident">long</span>)]</span>
<span class="ident">verbose</span>: <span class="ident">bool</span>,
<span class="doccomment">/// An optional name</span>
<span class="attribute">#[<span class="ident">arg</span>(<span class="ident">short</span>, <span class="ident">long</span>)]</span>
<span class="ident">name</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">String</span><span class="op">&gt;</span>,
}</code></pre></div>
<p>The equivalent <a href="builder/struct.Command.html" title="Command"><code>Command</code></a> struct + <code>From</code> implementation:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="ident">Command::new</span>(<span class="string">&quot;demo&quot;</span>)
.<span class="ident">about</span>(<span class="string">&quot;My super CLI&quot;</span>)
.<span class="ident">arg</span>(<span class="ident">Arg::new</span>(<span class="string">&quot;verbose&quot;</span>)
.<span class="ident">long</span>(<span class="string">&quot;verbose&quot;</span>)
.<span class="ident">action</span>(<span class="ident">ArgAction::SetTrue</span>)
.<span class="ident">help</span>(<span class="string">&quot;More verbose output&quot;</span>))
.<span class="ident">arg</span>(<span class="ident">Arg::new</span>(<span class="string">&quot;name&quot;</span>)
.<span class="ident">long</span>(<span class="string">&quot;name&quot;</span>)
.<span class="ident">short</span>(<span class="string">&#39;n&#39;</span>)
.<span class="ident">help</span>(<span class="string">&quot;An optional name&quot;</span>)
.<span class="ident">action</span>(<span class="ident">ArgAction::Set</span>));
<span class="kw">struct</span> <span class="ident">Context</span> {
<span class="ident">verbose</span>: <span class="ident">bool</span>,
<span class="ident">name</span>: <span class="prelude-ty">Option</span><span class="op">&lt;</span><span class="ident">String</span><span class="op">&gt;</span>,
}
<span class="kw">impl</span> <span class="ident">From</span><span class="op">&lt;</span><span class="ident">ArgMatches</span><span class="op">&gt;</span> <span class="kw">for</span> <span class="ident">Context</span> {
<span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">m</span>: <span class="ident">ArgMatches</span>) -&gt; <span class="self">Self</span> {
<span class="ident">Context</span> {
<span class="ident">verbose</span>: <span class="kw-2">*</span><span class="ident">m</span>.<span class="ident">get_one</span>::<span class="op">&lt;</span><span class="ident">bool</span><span class="op">&gt;</span>(<span class="string">&quot;verbose&quot;</span>).<span class="ident">expect</span>(<span class="string">&quot;defaulted_by_clap&quot;</span>),
<span class="ident">name</span>: <span class="ident">m</span>.<span class="ident">get_one</span>::<span class="op">&lt;</span><span class="ident">String</span><span class="op">&gt;</span>(<span class="string">&quot;name&quot;</span>).<span class="ident">cloned</span>(),
}
}
}</code></pre></div>
</div></details><h2 id="provided-methods" class="small-section-header">Provided Methods<a href="#provided-methods" class="anchor"></a></h2><div class="methods"><details class="rustdoc-toggle" open><summary><div id="method.parse" class="method has-srclink"><div class="rightside"><a class="srclink" href="../src/clap/derive.rs.html#81-93">source</a></div><h4 class="code-header">fn <a href="#method.parse" class="fnname">parse</a>() -&gt; Self</h4></div></summary><div class="docblock"><p>Parse from <code>std::env::args_os()</code>, exit on error</p>
</div></details><details class="rustdoc-toggle" open><summary><div id="method.try_parse" class="method has-srclink"><div class="rightside"><a class="srclink" href="../src/clap/derive.rs.html#96-99">source</a></div><h4 class="code-header">fn <a href="#method.try_parse" class="fnname">try_parse</a>() -&gt; <a class="enum" href="https://doc.rust-lang.org/1.64.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;Self, <a class="type" href="type.Error.html" title="type clap::Error">Error</a>&gt;</h4></div></summary><div class="docblock"><p>Parse from <code>std::env::args_os()</code>, return Err on error.</p>
</div></details><details class="rustdoc-toggle" open><summary><div id="method.parse_from" class="method has-srclink"><div class="rightside"><a class="srclink" href="../src/clap/derive.rs.html#102-118">source</a></div><h4 class="code-header">fn <a href="#method.parse_from" class="fnname">parse_from</a>&lt;I, T&gt;(itr: I) -&gt; Self <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;I: <a class="trait" href="https://doc.rust-lang.org/1.64.0/core/iter/traits/collect/trait.IntoIterator.html" title="trait core::iter::traits::collect::IntoIterator">IntoIterator</a>&lt;Item = T&gt;,<br>&nbsp;&nbsp;&nbsp;&nbsp;T: <a class="trait" href="https://doc.rust-lang.org/1.64.0/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a>&lt;<a class="struct" href="https://doc.rust-lang.org/1.64.0/std/ffi/os_str/struct.OsString.html" title="struct std::ffi::os_str::OsString">OsString</a>&gt; + <a class="trait" href="https://doc.rust-lang.org/1.64.0/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a>,&nbsp;</span></h4></div></summary><div class="docblock"><p>Parse from iterator, exit on error</p>
</div></details><details class="rustdoc-toggle" open><summary><div id="method.try_parse_from" class="method has-srclink"><div class="rightside"><a class="srclink" href="../src/clap/derive.rs.html#121-128">source</a></div><h4 class="code-header">fn <a href="#method.try_parse_from" class="fnname">try_parse_from</a>&lt;I, T&gt;(itr: I) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.64.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;Self, <a class="type" href="type.Error.html" title="type clap::Error">Error</a>&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;I: <a class="trait" href="https://doc.rust-lang.org/1.64.0/core/iter/traits/collect/trait.IntoIterator.html" title="trait core::iter::traits::collect::IntoIterator">IntoIterator</a>&lt;Item = T&gt;,<br>&nbsp;&nbsp;&nbsp;&nbsp;T: <a class="trait" href="https://doc.rust-lang.org/1.64.0/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a>&lt;<a class="struct" href="https://doc.rust-lang.org/1.64.0/std/ffi/os_str/struct.OsString.html" title="struct std::ffi::os_str::OsString">OsString</a>&gt; + <a class="trait" href="https://doc.rust-lang.org/1.64.0/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a>,&nbsp;</span></h4></div></summary><div class="docblock"><p>Parse from iterator, return Err on error.</p>
</div></details><details class="rustdoc-toggle" open><summary><div id="method.update_from" class="method has-srclink"><div class="rightside"><a class="srclink" href="../src/clap/derive.rs.html#131-144">source</a></div><h4 class="code-header">fn <a href="#method.update_from" class="fnname">update_from</a>&lt;I, T&gt;(&amp;mut self, itr: I) <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;I: <a class="trait" href="https://doc.rust-lang.org/1.64.0/core/iter/traits/collect/trait.IntoIterator.html" title="trait core::iter::traits::collect::IntoIterator">IntoIterator</a>&lt;Item = T&gt;,<br>&nbsp;&nbsp;&nbsp;&nbsp;T: <a class="trait" href="https://doc.rust-lang.org/1.64.0/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a>&lt;<a class="struct" href="https://doc.rust-lang.org/1.64.0/std/ffi/os_str/struct.OsString.html" title="struct std::ffi::os_str::OsString">OsString</a>&gt; + <a class="trait" href="https://doc.rust-lang.org/1.64.0/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a>,&nbsp;</span></h4></div></summary><div class="docblock"><p>Update from iterator, exit on error</p>
</div></details><details class="rustdoc-toggle" open><summary><div id="method.try_update_from" class="method has-srclink"><div class="rightside"><a class="srclink" href="../src/clap/derive.rs.html#147-156">source</a></div><h4 class="code-header">fn <a href="#method.try_update_from" class="fnname">try_update_from</a>&lt;I, T&gt;(&amp;mut self, itr: I) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.64.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.64.0/std/primitive.unit.html">()</a>, <a class="type" href="type.Error.html" title="type clap::Error">Error</a>&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;I: <a class="trait" href="https://doc.rust-lang.org/1.64.0/core/iter/traits/collect/trait.IntoIterator.html" title="trait core::iter::traits::collect::IntoIterator">IntoIterator</a>&lt;Item = T&gt;,<br>&nbsp;&nbsp;&nbsp;&nbsp;T: <a class="trait" href="https://doc.rust-lang.org/1.64.0/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a>&lt;<a class="struct" href="https://doc.rust-lang.org/1.64.0/std/ffi/os_str/struct.OsString.html" title="struct std::ffi::os_str::OsString">OsString</a>&gt; + <a class="trait" href="https://doc.rust-lang.org/1.64.0/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a>,&nbsp;</span></h4></div></summary><div class="docblock"><p>Update from iterator, return Err on error.</p>
</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><section id="impl-Parser-for-Box%3CT%3E" class="impl has-srclink"><span class="rightside"><a class="srclink" href="../src/clap/derive.rs.html#397-421">source</a></span><a href="#impl-Parser-for-Box%3CT%3E" class="anchor"></a><h3 class="code-header in-band">impl&lt;T:&nbsp;<a class="trait" href="trait.Parser.html" title="trait clap::Parser">Parser</a>&gt; <a class="trait" href="trait.Parser.html" title="trait clap::Parser">Parser</a> for <a class="struct" href="https://doc.rust-lang.org/1.64.0/alloc/boxed/struct.Box.html" title="struct alloc::boxed::Box">Box</a>&lt;T&gt;</h3></section></summary><div class="impl-items"><section id="method.parse-1" class="method trait-impl has-srclink"><span class="rightside"><a class="srclink" href="../src/clap/derive.rs.html#398-400">source</a></span><a href="#method.parse-1" class="anchor"></a><h4 class="code-header">fn <a href="#method.parse" class="fnname">parse</a>() -&gt; Self</h4></section><section id="method.try_parse-1" class="method trait-impl has-srclink"><span class="rightside"><a class="srclink" href="../src/clap/derive.rs.html#402-404">source</a></span><a href="#method.try_parse-1" class="anchor"></a><h4 class="code-header">fn <a href="#method.try_parse" class="fnname">try_parse</a>() -&gt; <a class="enum" href="https://doc.rust-lang.org/1.64.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;Self, <a class="type" href="type.Error.html" title="type clap::Error">Error</a>&gt;</h4></section><section id="method.parse_from-1" class="method trait-impl has-srclink"><span class="rightside"><a class="srclink" href="../src/clap/derive.rs.html#406-412">source</a></span><a href="#method.parse_from-1" class="anchor"></a><h4 class="code-header">fn <a href="#method.parse_from" class="fnname">parse_from</a>&lt;I, It&gt;(itr: I) -&gt; Self <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;I: <a class="trait" href="https://doc.rust-lang.org/1.64.0/core/iter/traits/collect/trait.IntoIterator.html" title="trait core::iter::traits::collect::IntoIterator">IntoIterator</a>&lt;Item = It&gt;,<br>&nbsp;&nbsp;&nbsp;&nbsp;It: <a class="trait" href="https://doc.rust-lang.org/1.64.0/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a>&lt;<a class="struct" href="https://doc.rust-lang.org/1.64.0/std/ffi/os_str/struct.OsString.html" title="struct std::ffi::os_str::OsString">OsString</a>&gt; + <a class="trait" href="https://doc.rust-lang.org/1.64.0/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a>,&nbsp;</span></h4></section><section id="method.try_parse_from-1" class="method trait-impl has-srclink"><span class="rightside"><a class="srclink" href="../src/clap/derive.rs.html#414-420">source</a></span><a href="#method.try_parse_from-1" class="anchor"></a><h4 class="code-header">fn <a href="#method.try_parse_from" class="fnname">try_parse_from</a>&lt;I, It&gt;(itr: I) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.64.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;Self, <a class="type" href="type.Error.html" title="type clap::Error">Error</a>&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;I: <a class="trait" href="https://doc.rust-lang.org/1.64.0/core/iter/traits/collect/trait.IntoIterator.html" title="trait core::iter::traits::collect::IntoIterator">IntoIterator</a>&lt;Item = It&gt;,<br>&nbsp;&nbsp;&nbsp;&nbsp;It: <a class="trait" href="https://doc.rust-lang.org/1.64.0/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a>&lt;<a class="struct" href="https://doc.rust-lang.org/1.64.0/std/ffi/os_str/struct.OsString.html" title="struct std::ffi::os_str::OsString">OsString</a>&gt; + <a class="trait" href="https://doc.rust-lang.org/1.64.0/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a>,&nbsp;</span></h4></section></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/derive/trait.Parser.js" data-ignore-extern-crates="alloc" async></script></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="1.64.0 (a55dd71d5 2022-09-19)" ></div></body></html>