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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 arguments into enums."><title>ValueEnum in clap_builder - Rust</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/SourceSerif4-Regular-46f98efaafac5295.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/FiraSans-Regular-018c141bf0843ffd.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/FiraSans-Medium-8f9a781e4970d388.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/SourceCodePro-Regular-562dcc5011b6de7d.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/SourceCodePro-Semibold-d899c5a5c4aeb14a.ttf.woff2"><link rel="stylesheet" href="../static.files/normalize-76eba96aa4d2e634.css"><link rel="stylesheet" href="../static.files/rustdoc-ac92e1bbe349e143.css"><meta name="rustdoc-vars" data-root-path="../" data-static-root-path="../static.files/" data-current-crate="clap_builder" data-themes="" data-resource-suffix="" data-rustdoc-version="1.76.0 (07dca489a 2024-02-04)" data-channel="1.76.0" data-search-js="search-2b6ce74ff89ae146.js" data-settings-js="settings-4313503d2e1961c2.js" ><script src="../static.files/storage-f2adc0d6ca4d09fb.js"></script><script defer src="sidebar-items.js"></script><script defer src="../static.files/main-305769736d49e732.js"></script><noscript><link rel="stylesheet" href="../static.files/noscript-feafe1bb7466e4bd.css"></noscript><link rel="alternate icon" type="image/png" href="../static.files/favicon-16x16-8b506e7a72182f1c.png"><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 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">☰</button><a class="logo-container" href="../clap_builder/index.html"><img src="https://raw.githubusercontent.com/clap-rs/clap/master/assets/clap.png" alt=""></a></nav><nav class="sidebar"><div class="sidebar-crate"><a class="logo-container" href="../clap_builder/index.html"><img src="https://raw.githubusercontent.com/clap-rs/clap/master/assets/clap.png" alt="logo"></a><h2><a href="../clap_builder/index.html">clap_builder</a><span class="version">4.5.0</span></h2></div><h2 class="location"><a href="#">ValueEnum</a></h2><div class="sidebar-elems"><section><h3><a href="#required-methods">Required Methods</a></h3><ul class="block"><li><a href="#tymethod.to_possible_value">to_possible_value</a></li><li><a href="#tymethod.value_variants">value_variants</a></li></ul><h3><a href="#provided-methods">Provided Methods</a></h3><ul class="block"><li><a href="#method.from_str">from_str</a></li></ul><h3><a href="#object-safety">Object Safety</a></h3><h3><a href="#implementors">Implementors</a></h3></section><h2><a href="index.html">In crate clap_builder</a></h2></div></nav><div class="sidebar-resizer"></div>
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<main><div class="width-limiter"><nav class="sub"><form class="search-form"><span></span><div id="sidebar-button" tabindex="-1"><a href="../clap_builder/all.html" title="show sidebar"></a></div><input class="search-input" name="search" aria-label="Run search in the documentation" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" tabindex="-1"><a href="../help.html" title="help">?</a></div><div id="settings-menu" tabindex="-1"><a href="../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../static.files/wheel-7b819b6101059cd0.svg"></a></div></form></nav><section id="main-content" class="content"><div class="main-heading"><h1>Trait <a href="index.html">clap_builder</a>::<wbr><a class="trait" href="#">ValueEnum</a><button id="copy-path" title="Copy item path to clipboard"><img src="../static.files/clipboard-7571035ce49a181d.svg" width="19" height="18" alt="Copy item path"></button></h1><span class="out-of-band"><a class="src" href="../src/clap_builder/derive.rs.html#264-285">source</a> · <button id="toggle-all-docs" title="collapse all docs">[<span>−</span>]</button></span></div><pre class="rust item-decl"><code>pub trait ValueEnum: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a> + <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a> {
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// Required methods
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fn <a href="#tymethod.value_variants" class="fn">value_variants</a><'a>() -> &'a <a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.slice.html">[Self]</a>;
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<span class="item-spacer"></span> fn <a href="#tymethod.to_possible_value" class="fn">to_possible_value</a>(&self) -> <a class="enum" href="https://doc.rust-lang.org/1.76.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a><<a class="struct" href="builder/struct.PossibleValue.html" title="struct clap_builder::builder::PossibleValue">PossibleValue</a>>;
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// Provided method
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fn <a href="#method.from_str" class="fn">from_str</a>(input: &<a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.str.html">str</a>, ignore_case: <a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.bool.html">bool</a>) -> <a class="enum" href="https://doc.rust-lang.org/1.76.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><Self, <a class="struct" href="https://doc.rust-lang.org/1.76.0/alloc/string/struct.String.html" title="struct alloc::string::String">String</a>> { ... }
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}</code></pre><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Parse arguments into enums.</p>
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<p>When deriving <a href="trait.Parser.html" title="trait clap_builder::Parser"><code>Parser</code></a>, a field whose type implements <code>ValueEnum</code> can have the attribute
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<code>#[arg(value_enum)]</code> which will</p>
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<ul>
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<li>Call <a href="builder/struct.EnumValueParser.html" title="struct clap_builder::builder::EnumValueParser"><code>EnumValueParser</code></a></li>
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<li>Allowing using the <code>#[arg(default_value_t)]</code> attribute without implementing <code>Display</code>.</li>
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</ul>
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<p><strong>NOTE:</strong> Deriving requires the <code>derive</code> feature flag</p>
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</div></details><h2 id="required-methods" class="section-header">Required Methods<a href="#required-methods" class="anchor">§</a></h2><div class="methods"><details class="toggle method-toggle" open><summary><section id="tymethod.value_variants" class="method"><a class="src rightside" href="../src/clap_builder/derive.rs.html#266">source</a><h4 class="code-header">fn <a href="#tymethod.value_variants" class="fn">value_variants</a><'a>() -> &'a <a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.slice.html">[Self]</a></h4></section></summary><div class="docblock"><p>All possible argument values, in display order.</p>
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</div></details><details class="toggle method-toggle" open><summary><section id="tymethod.to_possible_value" class="method"><a class="src rightside" href="../src/clap_builder/derive.rs.html#284">source</a><h4 class="code-header">fn <a href="#tymethod.to_possible_value" class="fn">to_possible_value</a>(&self) -> <a class="enum" href="https://doc.rust-lang.org/1.76.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a><<a class="struct" href="builder/struct.PossibleValue.html" title="struct clap_builder::builder::PossibleValue">PossibleValue</a>></h4></section></summary><div class="docblock"><p>The canonical argument value.</p>
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<p>The value is <code>None</code> for skipped variants.</p>
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</div></details></div><h2 id="provided-methods" class="section-header">Provided Methods<a href="#provided-methods" class="anchor">§</a></h2><div class="methods"><details class="toggle method-toggle" open><summary><section id="method.from_str" class="method"><a class="src rightside" href="../src/clap_builder/derive.rs.html#269-279">source</a><h4 class="code-header">fn <a href="#method.from_str" class="fn">from_str</a>(input: &<a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.str.html">str</a>, ignore_case: <a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.bool.html">bool</a>) -> <a class="enum" href="https://doc.rust-lang.org/1.76.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><Self, <a class="struct" href="https://doc.rust-lang.org/1.76.0/alloc/string/struct.String.html" title="struct alloc::string::String">String</a>></h4></section></summary><div class="docblock"><p>Parse an argument into <code>Self</code>.</p>
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</div></details></div><h2 id="object-safety" class="section-header">Object Safety<a href="#object-safety" class="anchor">§</a></h2><div class="object-safety-info">This trait is <b>not</b> <a href="https://doc.rust-lang.org/1.76.0/reference/items/traits.html#object-safety">object safe</a>.</div><h2 id="implementors" class="section-header">Implementors<a href="#implementors" class="anchor">§</a></h2><div id="implementors-list"><section id="impl-ValueEnum-for-ColorChoice" class="impl"><a class="src rightside" href="../src/clap_builder/util/color.rs.html#104-116">source</a><a href="#impl-ValueEnum-for-ColorChoice" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="trait.ValueEnum.html" title="trait clap_builder::ValueEnum">ValueEnum</a> for <a class="enum" href="enum.ColorChoice.html" title="enum clap_builder::ColorChoice">ColorChoice</a></h3></section></div><script src="../trait.impl/clap_builder/derive/trait.ValueEnum.js" async></script></section></div></main></body></html> |