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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/validate argument values"><title>ValueParser in clap_builder::builder - 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="clap_builder" 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 struct"><!--[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><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">4.5.11</span></h2></div><h2 class="location"><a href="#">ValueParser</a></h2><div class="sidebar-elems"><section><h3><a href="#implementations">Methods</a></h3><ul class="block method"><li><a href="#method.bool">bool</a></li><li><a href="#method.new">new</a></li><li><a href="#method.os_string">os_string</a></li><li><a href="#method.path_buf">path_buf</a></li><li><a href="#method.possible_values">possible_values</a></li><li><a href="#method.string">string</a></li><li><a href="#method.type_id">type_id</a></li></ul><h3><a href="#trait-implementations">Trait Implementations</a></h3><ul class="block trait-implementation"><li><a href="#impl-Clone-for-ValueParser">Clone</a></li><li><a href="#impl-Debug-for-ValueParser">Debug</a></li><li><a href="#impl-From%3CP%3E-for-ValueParser">From&lt;P&gt;</a></li><li><a href="#impl-From%3CRange%3Ci64%3E%3E-for-ValueParser">From&lt;Range&lt;i64&gt;&gt;</a></li><li><a href="#impl-From%3CRangeFrom%3Ci64%3E%3E-for-ValueParser">From&lt;RangeFrom&lt;i64&gt;&gt;</a></li><li><a href="#impl-From%3CRangeFull%3E-for-ValueParser">From&lt;RangeFull&gt;</a></li><li><a href="#impl-From%3CRangeInclusive%3Ci64%3E%3E-for-ValueParser">From&lt;RangeInclusive&lt;i64&gt;&gt;</a></li><li><a href="#impl-From%3CRangeTo%3Ci64%3E%3E-for-ValueParser">From&lt;RangeTo&lt;i64&gt;&gt;</a></li><li><a href="#impl-From%3CRangeToInclusive%3Ci64%3E%3E-for-ValueParser">From&lt;RangeToInclusive&lt;i64&gt;&gt;</a></li><li><a href="#impl-From%3CVec%3CP%3E%3E-for-ValueParser">From&lt;Vec&lt;P&gt;&gt;</a></li><li><a href="#impl-From%3C%5BP;+C%5D%3E-for-ValueParser">From&lt;[P; C]&gt;</a></li><li><a href="#impl-IntoResettable%3CValueParser%3E-for-Option%3CValueParser%3E">IntoResettable&lt;ValueParser&gt;</a></li></ul><h3><a href="#synthetic-implementations">Auto Trait Implementations</a></h3><ul class="block synthetic-implementation"><li><a href="#impl-RefUnwindSafe-for-ValueParser">!RefUnwindSafe</a></li><li><a href="#impl-UnwindSafe-for-ValueParser">!UnwindSafe</a></li><li><a href="#impl-Freeze-for-ValueParser">Freeze</a></li><li><a href="#impl-Send-for-ValueParser">Send</a></li><li><a href="#impl-Sync-for-ValueParser">Sync</a></li><li><a href="#impl-Unpin-for-ValueParser">Unpin</a></li></ul><h3><a href="#blanket-implementations">Blanket Implementations</a></h3><ul class="block blanket-implementation"><li><a href="#impl-Any-for-T">Any</a></li><li><a href="#impl-Borrow%3CT%3E-for-T">Borrow&lt;T&gt;</a></li><li><a href="#impl-BorrowMut%3CT%3E-for-T">BorrowMut&lt;T&gt;</a></li><li><a href="#impl-From%3CT%3E-for-T">From&lt;T&gt;</a></li><li><a href="#impl-Into%3CU%3E-for-T">Into&lt;U&gt;</a></li><li><a href="#impl-IntoResettable%3CValueParser%3E-for-I">IntoResettable&lt;ValueParser&gt;</a></li><li><a href="#impl-ToOwned-for-T">ToOwned</a></li><li><a href="#impl-TryFrom%3CU%3E-for-T">TryFrom&lt;U&gt;</a></li><li><a href="#impl-TryInto%3CU%3E-for-T">TryInto&lt;U&gt;</a></li></ul></section><h2><a href="index.html">In clap_builder::builder</a></h2></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>Struct <a href="../index.html">clap_builder</a>::<wbr><a href="index.html">builder</a>::<wbr><a class="struct" href="#">ValueParser</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/clap_builder/builder/value_parser.rs.html#63">source</a> · <button id="toggle-all-docs" title="collapse all docs">[<span>&#x2212;</span>]</button></span></div><pre class="rust item-decl"><code>pub struct ValueParser(<span class="comment">/* private fields */</span>);</code></pre><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Parse/validate argument values</p>
<p>Specified with <a href="struct.Arg.html#method.value_parser" title="method clap_builder::builder::Arg::value_parser"><code>Arg::value_parser</code></a>.</p>
<p><code>ValueParser</code> defines how to convert a raw argument value into a validated and typed value for
use within an application.</p>
<p>See</p>
<ul>
<li><a href="../macro.value_parser.html" title="macro clap_builder::value_parser"><code>value_parser!</code></a> for automatically selecting an implementation for a given type</li>
<li><a href="struct.ValueParser.html#method.new" title="associated function clap_builder::builder::ValueParser::new"><code>ValueParser::new</code></a> for additional <a href="trait.TypedValueParser.html" title="trait clap_builder::builder::TypedValueParser"><code>TypedValueParser</code></a> that can be used</li>
</ul>
<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">let </span><span class="kw-2">mut </span>cmd = clap::Command::new(<span class="string">"raw"</span>)
.arg(
clap::Arg::new(<span class="string">"color"</span>)
.long(<span class="string">"color"</span>)
.value_parser([<span class="string">"always"</span>, <span class="string">"auto"</span>, <span class="string">"never"</span>])
.default_value(<span class="string">"auto"</span>)
)
.arg(
clap::Arg::new(<span class="string">"hostname"</span>)
.long(<span class="string">"hostname"</span>)
.value_parser(clap::builder::NonEmptyStringValueParser::new())
.action(clap::ArgAction::Set)
.required(<span class="bool-val">true</span>)
)
.arg(
clap::Arg::new(<span class="string">"port"</span>)
.long(<span class="string">"port"</span>)
.value_parser(<span class="macro">clap::value_parser!</span>(u16).range(<span class="number">3000</span>..))
.action(clap::ArgAction::Set)
.required(<span class="bool-val">true</span>)
);
<span class="kw">let </span>m = cmd.try_get_matches_from_mut(
[<span class="string">"cmd"</span>, <span class="string">"--hostname"</span>, <span class="string">"rust-lang.org"</span>, <span class="string">"--port"</span>, <span class="string">"3001"</span>]
).unwrap();
<span class="kw">let </span>color: <span class="kw-2">&amp;</span>String = m.get_one(<span class="string">"color"</span>)
.expect(<span class="string">"default"</span>);
<span class="macro">assert_eq!</span>(color, <span class="string">"auto"</span>);
<span class="kw">let </span>hostname: <span class="kw-2">&amp;</span>String = m.get_one(<span class="string">"hostname"</span>)
.expect(<span class="string">"required"</span>);
<span class="macro">assert_eq!</span>(hostname, <span class="string">"rust-lang.org"</span>);
<span class="kw">let </span>port: u16 = <span class="kw-2">*</span>m.get_one(<span class="string">"port"</span>)
.expect(<span class="string">"required"</span>);
<span class="macro">assert_eq!</span>(port, <span class="number">3001</span>);</code></pre></div>
</div></details><h2 id="implementations" class="section-header">Implementations<a href="#implementations" class="anchor">§</a></h2><div id="implementations-list"><details class="toggle implementors-toggle" open><summary><section id="impl-ValueParser" class="impl"><a class="src rightside" href="../../src/clap_builder/builder/value_parser.rs.html#77-229">source</a><a href="#impl-ValueParser" class="anchor">§</a><h3 class="code-header">impl <a class="struct" href="struct.ValueParser.html" title="struct clap_builder::builder::ValueParser">ValueParser</a></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.new" class="method"><a class="src rightside" href="../../src/clap_builder/builder/value_parser.rs.html#112-117">source</a><h4 class="code-header">pub fn <a href="#method.new" class="fn">new</a>&lt;P&gt;(other: P) -&gt; Self<div class="where">where
P: <a class="trait" href="trait.TypedValueParser.html" title="trait clap_builder::builder::TypedValueParser">TypedValueParser</a>,</div></h4></section></summary><div class="docblock"><p>Custom parser for argument values</p>
<p>Pre-existing <a href="trait.TypedValueParser.html" title="trait clap_builder::builder::TypedValueParser"><code>TypedValueParser</code></a> implementations include:</p>
<ul>
<li><code>Fn(&amp;str) -&gt; Result&lt;T, E&gt;</code></li>
<li><a href="struct.EnumValueParser.html" title="struct clap_builder::builder::EnumValueParser"><code>EnumValueParser</code></a> and <a href="struct.PossibleValuesParser.html" title="struct clap_builder::builder::PossibleValuesParser"><code>PossibleValuesParser</code></a> for static enumerated values</li>
<li><a href="struct.BoolishValueParser.html" title="struct clap_builder::builder::BoolishValueParser"><code>BoolishValueParser</code></a> and <a href="struct.FalseyValueParser.html" title="struct clap_builder::builder::FalseyValueParser"><code>FalseyValueParser</code></a> for alternative <code>bool</code> implementations</li>
<li><a href="struct.RangedI64ValueParser.html" title="struct clap_builder::builder::RangedI64ValueParser"><code>RangedI64ValueParser</code></a> and <a href="struct.RangedU64ValueParser.html" title="struct clap_builder::builder::RangedU64ValueParser"><code>RangedU64ValueParser</code></a></li>
<li><a href="struct.NonEmptyStringValueParser.html" title="struct clap_builder::builder::NonEmptyStringValueParser"><code>NonEmptyStringValueParser</code></a></li>
</ul>
<h5 id="example-1"><a class="doc-anchor" href="#example-1">§</a>Example</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">type </span>EnvVar = (String, <span class="prelude-ty">Option</span>&lt;String&gt;);
<span class="kw">fn </span>parse_env_var(env: <span class="kw-2">&amp;</span>str) -&gt; <span class="prelude-ty">Result</span>&lt;EnvVar, std::io::Error&gt; {
<span class="kw">if let </span><span class="prelude-val">Some</span>((var, value)) = env.split_once(<span class="string">'='</span>) {
<span class="prelude-val">Ok</span>((var.to_owned(), <span class="prelude-val">Some</span>(value.to_owned())))
} <span class="kw">else </span>{
<span class="prelude-val">Ok</span>((env.to_owned(), <span class="prelude-val">None</span>))
}
}
<span class="kw">let </span><span class="kw-2">mut </span>cmd = clap::Command::new(<span class="string">"raw"</span>)
.arg(
clap::Arg::new(<span class="string">"env"</span>)
.value_parser(clap::builder::ValueParser::new(parse_env_var))
.required(<span class="bool-val">true</span>)
);
<span class="kw">let </span>m = cmd.try_get_matches_from_mut([<span class="string">"cmd"</span>, <span class="string">"key=value"</span>]).unwrap();
<span class="kw">let </span>port: <span class="kw-2">&amp;</span>EnvVar = m.get_one(<span class="string">"env"</span>)
.expect(<span class="string">"required"</span>);
<span class="macro">assert_eq!</span>(<span class="kw-2">*</span>port, (<span class="string">"key"</span>.into(), <span class="prelude-val">Some</span>(<span class="string">"value"</span>.into())));</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.bool" class="method"><a class="src rightside" href="../../src/clap_builder/builder/value_parser.rs.html#143-145">source</a><h4 class="code-header">pub const fn <a href="#method.bool" class="fn">bool</a>() -&gt; Self</h4></section></summary><div class="docblock"><p><a href="https://doc.rust-lang.org/1.80.0/std/primitive.bool.html" title="primitive bool"><code>bool</code></a> parser for argument values</p>
<p>See also:</p>
<ul>
<li><a href="struct.BoolishValueParser.html" title="struct clap_builder::builder::BoolishValueParser"><code>BoolishValueParser</code></a> for different human readable bool representations</li>
<li><a href="struct.FalseyValueParser.html" title="struct clap_builder::builder::FalseyValueParser"><code>FalseyValueParser</code></a> for assuming non-false is true</li>
</ul>
<h5 id="example-2"><a class="doc-anchor" href="#example-2">§</a>Example</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>cmd = clap::Command::new(<span class="string">"raw"</span>)
.arg(
clap::Arg::new(<span class="string">"download"</span>)
.value_parser(<span class="macro">clap::value_parser!</span>(bool))
.required(<span class="bool-val">true</span>)
);
<span class="kw">let </span>m = cmd.try_get_matches_from_mut([<span class="string">"cmd"</span>, <span class="string">"true"</span>]).unwrap();
<span class="kw">let </span>port: bool = <span class="kw-2">*</span>m.get_one(<span class="string">"download"</span>)
.expect(<span class="string">"required"</span>);
<span class="macro">assert_eq!</span>(port, <span class="bool-val">true</span>);
<span class="macro">assert!</span>(cmd.try_get_matches_from_mut([<span class="string">"cmd"</span>, <span class="string">"forever"</span>]).is_err());</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.string" class="method"><a class="src rightside" href="../../src/clap_builder/builder/value_parser.rs.html#168-170">source</a><h4 class="code-header">pub const fn <a href="#method.string" class="fn">string</a>() -&gt; Self</h4></section></summary><div class="docblock"><p><a href="https://doc.rust-lang.org/1.80.0/alloc/string/struct.String.html" title="struct alloc::string::String"><code>String</code></a> parser for argument values</p>
<p>See also:</p>
<ul>
<li><a href="struct.NonEmptyStringValueParser.html" title="struct clap_builder::builder::NonEmptyStringValueParser"><code>NonEmptyStringValueParser</code></a></li>
</ul>
<h5 id="example-3"><a class="doc-anchor" href="#example-3">§</a>Example</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>cmd = clap::Command::new(<span class="string">"raw"</span>)
.arg(
clap::Arg::new(<span class="string">"port"</span>)
.value_parser(<span class="macro">clap::value_parser!</span>(String))
.required(<span class="bool-val">true</span>)
);
<span class="kw">let </span>m = cmd.try_get_matches_from_mut([<span class="string">"cmd"</span>, <span class="string">"80"</span>]).unwrap();
<span class="kw">let </span>port: <span class="kw-2">&amp;</span>String = m.get_one(<span class="string">"port"</span>)
.expect(<span class="string">"required"</span>);
<span class="macro">assert_eq!</span>(port, <span class="string">"80"</span>);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.os_string" class="method"><a class="src rightside" href="../../src/clap_builder/builder/value_parser.rs.html#200-202">source</a><h4 class="code-header">pub const fn <a href="#method.os_string" class="fn">os_string</a>() -&gt; Self</h4></section></summary><div class="docblock"><p><a href="https://doc.rust-lang.org/1.80.0/std/ffi/os_str/struct.OsString.html" title="struct std::ffi::os_str::OsString"><code>OsString</code></a> parser for argument values</p>
<h5 id="example-4"><a class="doc-anchor" href="#example-4">§</a>Example</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>std::ffi::OsString;
<span class="kw">use </span>std::os::unix::ffi::{OsStrExt,OsStringExt};
<span class="kw">let </span>r = Command::new(<span class="string">"myprog"</span>)
.arg(
Arg::new(<span class="string">"arg"</span>)
.required(<span class="bool-val">true</span>)
.value_parser(ValueParser::os_string())
)
.try_get_matches_from(<span class="macro">vec!</span>[
OsString::from(<span class="string">"myprog"</span>),
OsString::from_vec(<span class="macro">vec!</span>[<span class="number">0xe9</span>])
]);
<span class="macro">assert!</span>(r.is_ok());
<span class="kw">let </span>m = r.unwrap();
<span class="kw">let </span>arg: <span class="kw-2">&amp;</span>OsString = m.get_one(<span class="string">"arg"</span>)
.expect(<span class="string">"required"</span>);
<span class="macro">assert_eq!</span>(arg.as_bytes(), <span class="kw-2">&amp;</span>[<span class="number">0xe9</span>]);</code></pre></div>
</div></details><details class="toggle method-toggle" open><summary><section id="method.path_buf" class="method"><a class="src rightside" href="../../src/clap_builder/builder/value_parser.rs.html#226-228">source</a><h4 class="code-header">pub const fn <a href="#method.path_buf" class="fn">path_buf</a>() -&gt; Self</h4></section></summary><div class="docblock"><p><a href="https://doc.rust-lang.org/1.80.0/std/path/struct.PathBuf.html" title="struct std::path::PathBuf"><code>PathBuf</code></a> parser for argument values</p>
<h5 id="example-5"><a class="doc-anchor" href="#example-5">§</a>Example</h5>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>cmd = clap::Command::new(<span class="string">"raw"</span>)
.arg(
clap::Arg::new(<span class="string">"output"</span>)
.value_parser(<span class="macro">clap::value_parser!</span>(PathBuf))
.required(<span class="bool-val">true</span>)
);
<span class="kw">let </span>m = cmd.try_get_matches_from_mut([<span class="string">"cmd"</span>, <span class="string">"hello.txt"</span>]).unwrap();
<span class="kw">let </span>port: <span class="kw-2">&amp;</span>PathBuf = m.get_one(<span class="string">"output"</span>)
.expect(<span class="string">"required"</span>);
<span class="macro">assert_eq!</span>(port, Path::new(<span class="string">"hello.txt"</span>));
<span class="macro">assert!</span>(cmd.try_get_matches_from_mut([<span class="string">"cmd"</span>, <span class="string">""</span>]).is_err());</code></pre></div>
</div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-ValueParser-1" class="impl"><a class="src rightside" href="../../src/clap_builder/builder/value_parser.rs.html#231-269">source</a><a href="#impl-ValueParser-1" class="anchor">§</a><h3 class="code-header">impl <a class="struct" href="struct.ValueParser.html" title="struct clap_builder::builder::ValueParser">ValueParser</a></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.type_id" class="method"><a class="src rightside" href="../../src/clap_builder/builder/value_parser.rs.html#246-248">source</a><h4 class="code-header">pub fn <a href="#method.type_id" class="fn">type_id</a>(&amp;self) -&gt; AnyValueId</h4></section></summary><div class="docblock"><p>Describes the content of <code>AnyValue</code></p>
</div></details><details class="toggle method-toggle" open><summary><section id="method.possible_values" class="method"><a class="src rightside" href="../../src/clap_builder/builder/value_parser.rs.html#254-258">source</a><h4 class="code-header">pub fn <a href="#method.possible_values" class="fn">possible_values</a>(
&amp;self,
) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.80.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="struct" href="https://doc.rust-lang.org/1.80.0/alloc/boxed/struct.Box.html" title="struct alloc::boxed::Box">Box</a>&lt;dyn <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/iter/traits/iterator/trait.Iterator.html" title="trait core::iter::traits::iterator::Iterator">Iterator</a>&lt;Item = <a class="struct" href="struct.PossibleValue.html" title="struct clap_builder::builder::PossibleValue">PossibleValue</a>&gt; + '_&gt;&gt;</h4></section></summary><div class="docblock"><p>Reflect on enumerated value properties</p>
<p>Error checking should not be done with this; it is mostly targeted at user-facing
applications like errors and completion.</p>
</div></details></div></details></div><h2 id="trait-implementations" class="section-header">Trait Implementations<a href="#trait-implementations" class="anchor">§</a></h2><div id="trait-implementations-list"><details class="toggle implementors-toggle" open><summary><section id="impl-Clone-for-ValueParser" class="impl"><a class="src rightside" href="../../src/clap_builder/builder/value_parser.rs.html#578-588">source</a><a href="#impl-Clone-for-ValueParser" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a> for <a class="struct" href="struct.ValueParser.html" title="struct clap_builder::builder::ValueParser">ValueParser</a></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.clone" class="method trait-impl"><a class="src rightside" href="../../src/clap_builder/builder/value_parser.rs.html#579-587">source</a><a href="#method.clone" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.80.0/core/clone/trait.Clone.html#tymethod.clone" class="fn">clone</a>(&amp;self) -&gt; Self</h4></section></summary><div class='docblock'>Returns a copy of the value. <a href="https://doc.rust-lang.org/1.80.0/core/clone/trait.Clone.html#tymethod.clone">Read more</a></div></details><details class="toggle method-toggle" open><summary><section id="method.clone_from" class="method trait-impl"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="src" href="https://doc.rust-lang.org/1.80.0/src/core/clone.rs.html#169">source</a></span><a href="#method.clone_from" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.80.0/core/clone/trait.Clone.html#method.clone_from" class="fn">clone_from</a>(&amp;mut self, source: <a class="primitive" href="https://doc.rust-lang.org/1.80.0/std/primitive.reference.html">&amp;Self</a>)</h4></section></summary><div class='docblock'>Performs copy-assignment from <code>source</code>. <a href="https://doc.rust-lang.org/1.80.0/core/clone/trait.Clone.html#method.clone_from">Read more</a></div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-Debug-for-ValueParser" class="impl"><a class="src rightside" href="../../src/clap_builder/builder/value_parser.rs.html#566-576">source</a><a href="#impl-Debug-for-ValueParser" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a> for <a class="struct" href="struct.ValueParser.html" title="struct clap_builder::builder::ValueParser">ValueParser</a></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.fmt" class="method trait-impl"><a class="src rightside" href="../../src/clap_builder/builder/value_parser.rs.html#567-575">source</a><a href="#method.fmt" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.80.0/core/fmt/trait.Debug.html#tymethod.fmt" class="fn">fmt</a>(&amp;self, f: &amp;mut <a class="struct" href="https://doc.rust-lang.org/1.80.0/core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a>&lt;'_&gt;) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.80.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.80.0/std/primitive.unit.html">()</a>, <a class="struct" href="https://doc.rust-lang.org/1.80.0/core/fmt/struct.Error.html" title="struct core::fmt::Error">Error</a>&gt;</h4></section></summary><div class='docblock'>Formats the value using the given formatter. <a href="https://doc.rust-lang.org/1.80.0/core/fmt/trait.Debug.html#tymethod.fmt">Read more</a></div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-From%3C%5BP;+C%5D%3E-for-ValueParser" class="impl"><a class="src rightside" href="../../src/clap_builder/builder/value_parser.rs.html#520-528">source</a><a href="#impl-From%3C%5BP;+C%5D%3E-for-ValueParser" class="anchor">§</a><h3 class="code-header">impl&lt;P, const C: <a class="primitive" href="https://doc.rust-lang.org/1.80.0/std/primitive.usize.html">usize</a>&gt; <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/convert/trait.From.html" title="trait core::convert::From">From</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.80.0/std/primitive.array.html">[P; C]</a>&gt; for <a class="struct" href="struct.ValueParser.html" title="struct clap_builder::builder::ValueParser">ValueParser</a><div class="where">where
P: <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a>&lt;<a class="struct" href="struct.PossibleValue.html" title="struct clap_builder::builder::PossibleValue">PossibleValue</a>&gt;,</div></h3></section></summary><div class="docblock"><p>Create a <a href="struct.ValueParser.html" title="struct clap_builder::builder::ValueParser"><code>ValueParser</code></a> with <a href="struct.PossibleValuesParser.html" title="struct clap_builder::builder::PossibleValuesParser"><code>PossibleValuesParser</code></a></p>
<p>See <a href="struct.PossibleValuesParser.html" title="struct clap_builder::builder::PossibleValuesParser"><code>PossibleValuesParser</code></a> for more flexibility in creating the
<a href="struct.PossibleValue.html" title="struct clap_builder::builder::PossibleValue"><code>PossibleValue</code></a>s.</p>
<h4 id="examples-6"><a class="doc-anchor" href="#examples-6">§</a>Examples</h4>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>cmd = clap::Command::new(<span class="string">"raw"</span>)
.arg(
clap::Arg::new(<span class="string">"color"</span>)
.long(<span class="string">"color"</span>)
.value_parser([<span class="string">"always"</span>, <span class="string">"auto"</span>, <span class="string">"never"</span>])
.default_value(<span class="string">"auto"</span>)
);
<span class="kw">let </span>m = cmd.try_get_matches_from_mut(
[<span class="string">"cmd"</span>, <span class="string">"--color"</span>, <span class="string">"never"</span>]
).unwrap();
<span class="kw">let </span>color: <span class="kw-2">&amp;</span>String = m.get_one(<span class="string">"color"</span>)
.expect(<span class="string">"default"</span>);
<span class="macro">assert_eq!</span>(color, <span class="string">"never"</span>);</code></pre></div>
</div><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.from-6" class="method trait-impl"><a class="src rightside" href="../../src/clap_builder/builder/value_parser.rs.html#524-527">source</a><a href="#method.from-6" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.80.0/core/convert/trait.From.html#tymethod.from" class="fn">from</a>(values: <a class="primitive" href="https://doc.rust-lang.org/1.80.0/std/primitive.array.html">[P; C]</a>) -&gt; Self</h4></section></summary><div class='docblock'>Converts to this type from the input type.</div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-From%3CP%3E-for-ValueParser" class="impl"><a class="src rightside" href="../../src/clap_builder/builder/value_parser.rs.html#294-301">source</a><a href="#impl-From%3CP%3E-for-ValueParser" class="anchor">§</a><h3 class="code-header">impl&lt;P&gt; <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/convert/trait.From.html" title="trait core::convert::From">From</a>&lt;P&gt; for <a class="struct" href="struct.ValueParser.html" title="struct clap_builder::builder::ValueParser">ValueParser</a><div class="where">where
P: <a class="trait" href="trait.TypedValueParser.html" title="trait clap_builder::builder::TypedValueParser">TypedValueParser</a> + <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> + <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> + 'static,</div></h3></section></summary><div class="docblock"><p>Convert a <a href="trait.TypedValueParser.html" title="trait clap_builder::builder::TypedValueParser"><code>TypedValueParser</code></a> to <a href="struct.ValueParser.html" title="struct clap_builder::builder::ValueParser"><code>ValueParser</code></a></p>
<h4 id="example-6"><a class="doc-anchor" href="#example-6">§</a>Example</h4>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>cmd = clap::Command::new(<span class="string">"raw"</span>)
.arg(
clap::Arg::new(<span class="string">"hostname"</span>)
.long(<span class="string">"hostname"</span>)
.value_parser(clap::builder::NonEmptyStringValueParser::new())
.action(clap::ArgAction::Set)
.required(<span class="bool-val">true</span>)
);
<span class="kw">let </span>m = cmd.try_get_matches_from_mut(
[<span class="string">"cmd"</span>, <span class="string">"--hostname"</span>, <span class="string">"rust-lang.org"</span>]
).unwrap();
<span class="kw">let </span>hostname: <span class="kw-2">&amp;</span>String = m.get_one(<span class="string">"hostname"</span>)
.expect(<span class="string">"required"</span>);
<span class="macro">assert_eq!</span>(hostname, <span class="string">"rust-lang.org"</span>);</code></pre></div>
</div><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.from-7" class="method trait-impl"><a class="src rightside" href="../../src/clap_builder/builder/value_parser.rs.html#298-300">source</a><a href="#method.from-7" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.80.0/core/convert/trait.From.html#tymethod.from" class="fn">from</a>(p: P) -&gt; Self</h4></section></summary><div class='docblock'>Converts to this type from the input type.</div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-From%3CRange%3Ci64%3E%3E-for-ValueParser" class="impl"><a class="src rightside" href="../../src/clap_builder/builder/value_parser.rs.html#333-338">source</a><a href="#impl-From%3CRange%3Ci64%3E%3E-for-ValueParser" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/convert/trait.From.html" title="trait core::convert::From">From</a>&lt;<a class="struct" href="https://doc.rust-lang.org/1.80.0/core/ops/range/struct.Range.html" title="struct core::ops::range::Range">Range</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.80.0/std/primitive.i64.html">i64</a>&gt;&gt; for <a class="struct" href="struct.ValueParser.html" title="struct clap_builder::builder::ValueParser">ValueParser</a></h3></section></summary><div class="docblock"><p>Create an <code>i64</code> <a href="struct.ValueParser.html" title="struct clap_builder::builder::ValueParser"><code>ValueParser</code></a> from a <code>N..M</code> range</p>
<p>See <a href="struct.RangedI64ValueParser.html" title="struct clap_builder::builder::RangedI64ValueParser"><code>RangedI64ValueParser</code></a> for more control over the output type.</p>
<p>See also <a href="struct.RangedU64ValueParser.html" title="struct clap_builder::builder::RangedU64ValueParser"><code>RangedU64ValueParser</code></a></p>
<h4 id="examples-7"><a class="doc-anchor" href="#examples-7">§</a>Examples</h4>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>cmd = clap::Command::new(<span class="string">"raw"</span>)
.arg(
clap::Arg::new(<span class="string">"port"</span>)
.long(<span class="string">"port"</span>)
.value_parser(<span class="number">3000</span>..<span class="number">4000</span>)
.action(clap::ArgAction::Set)
.required(<span class="bool-val">true</span>)
);
<span class="kw">let </span>m = cmd.try_get_matches_from_mut([<span class="string">"cmd"</span>, <span class="string">"--port"</span>, <span class="string">"3001"</span>]).unwrap();
<span class="kw">let </span>port: i64 = <span class="kw-2">*</span>m.get_one(<span class="string">"port"</span>)
.expect(<span class="string">"required"</span>);
<span class="macro">assert_eq!</span>(port, <span class="number">3001</span>);</code></pre></div>
</div><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.from-8" class="method trait-impl"><a class="src rightside" href="../../src/clap_builder/builder/value_parser.rs.html#334-337">source</a><a href="#method.from-8" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.80.0/core/convert/trait.From.html#tymethod.from" class="fn">from</a>(value: <a class="struct" href="https://doc.rust-lang.org/1.80.0/core/ops/range/struct.Range.html" title="struct core::ops::range::Range">Range</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.80.0/std/primitive.i64.html">i64</a>&gt;) -&gt; Self</h4></section></summary><div class='docblock'>Converts to this type from the input type.</div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-From%3CRangeFrom%3Ci64%3E%3E-for-ValueParser" class="impl"><a class="src rightside" href="../../src/clap_builder/builder/value_parser.rs.html#395-400">source</a><a href="#impl-From%3CRangeFrom%3Ci64%3E%3E-for-ValueParser" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/convert/trait.From.html" title="trait core::convert::From">From</a>&lt;<a class="struct" href="https://doc.rust-lang.org/1.80.0/core/ops/range/struct.RangeFrom.html" title="struct core::ops::range::RangeFrom">RangeFrom</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.80.0/std/primitive.i64.html">i64</a>&gt;&gt; for <a class="struct" href="struct.ValueParser.html" title="struct clap_builder::builder::ValueParser">ValueParser</a></h3></section></summary><div class="docblock"><p>Create an <code>i64</code> <a href="struct.ValueParser.html" title="struct clap_builder::builder::ValueParser"><code>ValueParser</code></a> from a <code>N..</code> range</p>
<p>See <a href="struct.RangedI64ValueParser.html" title="struct clap_builder::builder::RangedI64ValueParser"><code>RangedI64ValueParser</code></a> for more control over the output type.</p>
<p>See also <a href="struct.RangedU64ValueParser.html" title="struct clap_builder::builder::RangedU64ValueParser"><code>RangedU64ValueParser</code></a></p>
<h4 id="examples-2"><a class="doc-anchor" href="#examples-2">§</a>Examples</h4>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>cmd = clap::Command::new(<span class="string">"raw"</span>)
.arg(
clap::Arg::new(<span class="string">"port"</span>)
.long(<span class="string">"port"</span>)
.value_parser(<span class="number">3000</span>..)
.action(clap::ArgAction::Set)
.required(<span class="bool-val">true</span>)
);
<span class="kw">let </span>m = cmd.try_get_matches_from_mut([<span class="string">"cmd"</span>, <span class="string">"--port"</span>, <span class="string">"3001"</span>]).unwrap();
<span class="kw">let </span>port: i64 = <span class="kw-2">*</span>m.get_one(<span class="string">"port"</span>)
.expect(<span class="string">"required"</span>);
<span class="macro">assert_eq!</span>(port, <span class="number">3001</span>);</code></pre></div>
</div><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.from-2" class="method trait-impl"><a class="src rightside" href="../../src/clap_builder/builder/value_parser.rs.html#396-399">source</a><a href="#method.from-2" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.80.0/core/convert/trait.From.html#tymethod.from" class="fn">from</a>(value: <a class="struct" href="https://doc.rust-lang.org/1.80.0/core/ops/range/struct.RangeFrom.html" title="struct core::ops::range::RangeFrom">RangeFrom</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.80.0/std/primitive.i64.html">i64</a>&gt;) -&gt; Self</h4></section></summary><div class='docblock'>Converts to this type from the input type.</div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-From%3CRangeFull%3E-for-ValueParser" class="impl"><a class="src rightside" href="../../src/clap_builder/builder/value_parser.rs.html#488-493">source</a><a href="#impl-From%3CRangeFull%3E-for-ValueParser" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/convert/trait.From.html" title="trait core::convert::From">From</a>&lt;<a class="struct" href="https://doc.rust-lang.org/1.80.0/core/ops/range/struct.RangeFull.html" title="struct core::ops::range::RangeFull">RangeFull</a>&gt; for <a class="struct" href="struct.ValueParser.html" title="struct clap_builder::builder::ValueParser">ValueParser</a></h3></section></summary><div class="docblock"><p>Create an <code>i64</code> <a href="struct.ValueParser.html" title="struct clap_builder::builder::ValueParser"><code>ValueParser</code></a> from a <code>..</code> range</p>
<p>See <a href="struct.RangedI64ValueParser.html" title="struct clap_builder::builder::RangedI64ValueParser"><code>RangedI64ValueParser</code></a> for more control over the output type.</p>
<p>See also <a href="struct.RangedU64ValueParser.html" title="struct clap_builder::builder::RangedU64ValueParser"><code>RangedU64ValueParser</code></a></p>
<h4 id="examples-3"><a class="doc-anchor" href="#examples-3">§</a>Examples</h4>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>cmd = clap::Command::new(<span class="string">"raw"</span>)
.arg(
clap::Arg::new(<span class="string">"port"</span>)
.long(<span class="string">"port"</span>)
.value_parser(..)
.action(clap::ArgAction::Set)
.required(<span class="bool-val">true</span>)
);
<span class="kw">let </span>m = cmd.try_get_matches_from_mut([<span class="string">"cmd"</span>, <span class="string">"--port"</span>, <span class="string">"3001"</span>]).unwrap();
<span class="kw">let </span>port: i64 = <span class="kw-2">*</span>m.get_one(<span class="string">"port"</span>)
.expect(<span class="string">"required"</span>);
<span class="macro">assert_eq!</span>(port, <span class="number">3001</span>);</code></pre></div>
</div><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.from-3" class="method trait-impl"><a class="src rightside" href="../../src/clap_builder/builder/value_parser.rs.html#489-492">source</a><a href="#method.from-3" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.80.0/core/convert/trait.From.html#tymethod.from" class="fn">from</a>(value: <a class="struct" href="https://doc.rust-lang.org/1.80.0/core/ops/range/struct.RangeFull.html" title="struct core::ops::range::RangeFull">RangeFull</a>) -&gt; Self</h4></section></summary><div class='docblock'>Converts to this type from the input type.</div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-From%3CRangeInclusive%3Ci64%3E%3E-for-ValueParser" class="impl"><a class="src rightside" href="../../src/clap_builder/builder/value_parser.rs.html#364-369">source</a><a href="#impl-From%3CRangeInclusive%3Ci64%3E%3E-for-ValueParser" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/convert/trait.From.html" title="trait core::convert::From">From</a>&lt;<a class="struct" href="https://doc.rust-lang.org/1.80.0/core/ops/range/struct.RangeInclusive.html" title="struct core::ops::range::RangeInclusive">RangeInclusive</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.80.0/std/primitive.i64.html">i64</a>&gt;&gt; for <a class="struct" href="struct.ValueParser.html" title="struct clap_builder::builder::ValueParser">ValueParser</a></h3></section></summary><div class="docblock"><p>Create an <code>i64</code> <a href="struct.ValueParser.html" title="struct clap_builder::builder::ValueParser"><code>ValueParser</code></a> from a <code>N..=M</code> range</p>
<p>See <a href="struct.RangedI64ValueParser.html" title="struct clap_builder::builder::RangedI64ValueParser"><code>RangedI64ValueParser</code></a> for more control over the output type.</p>
<p>See also <a href="struct.RangedU64ValueParser.html" title="struct clap_builder::builder::RangedU64ValueParser"><code>RangedU64ValueParser</code></a></p>
<h4 id="examples-1"><a class="doc-anchor" href="#examples-1">§</a>Examples</h4>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>cmd = clap::Command::new(<span class="string">"raw"</span>)
.arg(
clap::Arg::new(<span class="string">"port"</span>)
.long(<span class="string">"port"</span>)
.value_parser(<span class="number">3000</span>..=<span class="number">4000</span>)
.action(clap::ArgAction::Set)
.required(<span class="bool-val">true</span>)
);
<span class="kw">let </span>m = cmd.try_get_matches_from_mut([<span class="string">"cmd"</span>, <span class="string">"--port"</span>, <span class="string">"3001"</span>]).unwrap();
<span class="kw">let </span>port: i64 = <span class="kw-2">*</span>m.get_one(<span class="string">"port"</span>)
.expect(<span class="string">"required"</span>);
<span class="macro">assert_eq!</span>(port, <span class="number">3001</span>);</code></pre></div>
</div><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.from-1" class="method trait-impl"><a class="src rightside" href="../../src/clap_builder/builder/value_parser.rs.html#365-368">source</a><a href="#method.from-1" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.80.0/core/convert/trait.From.html#tymethod.from" class="fn">from</a>(value: <a class="struct" href="https://doc.rust-lang.org/1.80.0/core/ops/range/struct.RangeInclusive.html" title="struct core::ops::range::RangeInclusive">RangeInclusive</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.80.0/std/primitive.i64.html">i64</a>&gt;) -&gt; Self</h4></section></summary><div class='docblock'>Converts to this type from the input type.</div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-From%3CRangeTo%3Ci64%3E%3E-for-ValueParser" class="impl"><a class="src rightside" href="../../src/clap_builder/builder/value_parser.rs.html#426-431">source</a><a href="#impl-From%3CRangeTo%3Ci64%3E%3E-for-ValueParser" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/convert/trait.From.html" title="trait core::convert::From">From</a>&lt;<a class="struct" href="https://doc.rust-lang.org/1.80.0/core/ops/range/struct.RangeTo.html" title="struct core::ops::range::RangeTo">RangeTo</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.80.0/std/primitive.i64.html">i64</a>&gt;&gt; for <a class="struct" href="struct.ValueParser.html" title="struct clap_builder::builder::ValueParser">ValueParser</a></h3></section></summary><div class="docblock"><p>Create an <code>i64</code> <a href="struct.ValueParser.html" title="struct clap_builder::builder::ValueParser"><code>ValueParser</code></a> from a <code>..M</code> range</p>
<p>See <a href="struct.RangedI64ValueParser.html" title="struct clap_builder::builder::RangedI64ValueParser"><code>RangedI64ValueParser</code></a> for more control over the output type.</p>
<p>See also <a href="struct.RangedU64ValueParser.html" title="struct clap_builder::builder::RangedU64ValueParser"><code>RangedU64ValueParser</code></a></p>
<h4 id="examples"><a class="doc-anchor" href="#examples">§</a>Examples</h4>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>cmd = clap::Command::new(<span class="string">"raw"</span>)
.arg(
clap::Arg::new(<span class="string">"port"</span>)
.long(<span class="string">"port"</span>)
.value_parser(..<span class="number">3000</span>)
.action(clap::ArgAction::Set)
.required(<span class="bool-val">true</span>)
);
<span class="kw">let </span>m = cmd.try_get_matches_from_mut([<span class="string">"cmd"</span>, <span class="string">"--port"</span>, <span class="string">"80"</span>]).unwrap();
<span class="kw">let </span>port: i64 = <span class="kw-2">*</span>m.get_one(<span class="string">"port"</span>)
.expect(<span class="string">"required"</span>);
<span class="macro">assert_eq!</span>(port, <span class="number">80</span>);</code></pre></div>
</div><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.from" class="method trait-impl"><a class="src rightside" href="../../src/clap_builder/builder/value_parser.rs.html#427-430">source</a><a href="#method.from" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.80.0/core/convert/trait.From.html#tymethod.from" class="fn">from</a>(value: <a class="struct" href="https://doc.rust-lang.org/1.80.0/core/ops/range/struct.RangeTo.html" title="struct core::ops::range::RangeTo">RangeTo</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.80.0/std/primitive.i64.html">i64</a>&gt;) -&gt; Self</h4></section></summary><div class='docblock'>Converts to this type from the input type.</div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-From%3CRangeToInclusive%3Ci64%3E%3E-for-ValueParser" class="impl"><a class="src rightside" href="../../src/clap_builder/builder/value_parser.rs.html#457-462">source</a><a href="#impl-From%3CRangeToInclusive%3Ci64%3E%3E-for-ValueParser" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/convert/trait.From.html" title="trait core::convert::From">From</a>&lt;<a class="struct" href="https://doc.rust-lang.org/1.80.0/core/ops/range/struct.RangeToInclusive.html" title="struct core::ops::range::RangeToInclusive">RangeToInclusive</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.80.0/std/primitive.i64.html">i64</a>&gt;&gt; for <a class="struct" href="struct.ValueParser.html" title="struct clap_builder::builder::ValueParser">ValueParser</a></h3></section></summary><div class="docblock"><p>Create an <code>i64</code> <a href="struct.ValueParser.html" title="struct clap_builder::builder::ValueParser"><code>ValueParser</code></a> from a <code>..=M</code> range</p>
<p>See <a href="struct.RangedI64ValueParser.html" title="struct clap_builder::builder::RangedI64ValueParser"><code>RangedI64ValueParser</code></a> for more control over the output type.</p>
<p>See also <a href="struct.RangedU64ValueParser.html" title="struct clap_builder::builder::RangedU64ValueParser"><code>RangedU64ValueParser</code></a></p>
<h4 id="examples-4"><a class="doc-anchor" href="#examples-4">§</a>Examples</h4>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span><span class="kw-2">mut </span>cmd = clap::Command::new(<span class="string">"raw"</span>)
.arg(
clap::Arg::new(<span class="string">"port"</span>)
.long(<span class="string">"port"</span>)
.value_parser(..=<span class="number">3000</span>)
.action(clap::ArgAction::Set)
.required(<span class="bool-val">true</span>)
);
<span class="kw">let </span>m = cmd.try_get_matches_from_mut([<span class="string">"cmd"</span>, <span class="string">"--port"</span>, <span class="string">"80"</span>]).unwrap();
<span class="kw">let </span>port: i64 = <span class="kw-2">*</span>m.get_one(<span class="string">"port"</span>)
.expect(<span class="string">"required"</span>);
<span class="macro">assert_eq!</span>(port, <span class="number">80</span>);</code></pre></div>
</div><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.from-4" class="method trait-impl"><a class="src rightside" href="../../src/clap_builder/builder/value_parser.rs.html#458-461">source</a><a href="#method.from-4" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.80.0/core/convert/trait.From.html#tymethod.from" class="fn">from</a>(value: <a class="struct" href="https://doc.rust-lang.org/1.80.0/core/ops/range/struct.RangeToInclusive.html" title="struct core::ops::range::RangeToInclusive">RangeToInclusive</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.80.0/std/primitive.i64.html">i64</a>&gt;) -&gt; Self</h4></section></summary><div class='docblock'>Converts to this type from the input type.</div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-From%3CVec%3CP%3E%3E-for-ValueParser" class="impl"><a class="src rightside" href="../../src/clap_builder/builder/value_parser.rs.html#556-564">source</a><a href="#impl-From%3CVec%3CP%3E%3E-for-ValueParser" class="anchor">§</a><h3 class="code-header">impl&lt;P&gt; <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/convert/trait.From.html" title="trait core::convert::From">From</a>&lt;<a class="struct" href="https://doc.rust-lang.org/1.80.0/alloc/vec/struct.Vec.html" title="struct alloc::vec::Vec">Vec</a>&lt;P&gt;&gt; for <a class="struct" href="struct.ValueParser.html" title="struct clap_builder::builder::ValueParser">ValueParser</a><div class="where">where
P: <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a>&lt;<a class="struct" href="struct.PossibleValue.html" title="struct clap_builder::builder::PossibleValue">PossibleValue</a>&gt;,</div></h3></section></summary><div class="docblock"><p>Create a <a href="struct.ValueParser.html" title="struct clap_builder::builder::ValueParser"><code>ValueParser</code></a> with <a href="struct.PossibleValuesParser.html" title="struct clap_builder::builder::PossibleValuesParser"><code>PossibleValuesParser</code></a></p>
<p>See <a href="struct.PossibleValuesParser.html" title="struct clap_builder::builder::PossibleValuesParser"><code>PossibleValuesParser</code></a> for more flexibility in creating the
<a href="struct.PossibleValue.html" title="struct clap_builder::builder::PossibleValue"><code>PossibleValue</code></a>s.</p>
<h4 id="examples-5"><a class="doc-anchor" href="#examples-5">§</a>Examples</h4>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">let </span>possible = <span class="macro">vec!</span>[<span class="string">"always"</span>, <span class="string">"auto"</span>, <span class="string">"never"</span>];
<span class="kw">let </span><span class="kw-2">mut </span>cmd = clap::Command::new(<span class="string">"raw"</span>)
.arg(
clap::Arg::new(<span class="string">"color"</span>)
.long(<span class="string">"color"</span>)
.value_parser(possible)
.default_value(<span class="string">"auto"</span>)
);
<span class="kw">let </span>m = cmd.try_get_matches_from_mut(
[<span class="string">"cmd"</span>, <span class="string">"--color"</span>, <span class="string">"never"</span>]
).unwrap();
<span class="kw">let </span>color: <span class="kw-2">&amp;</span>String = m.get_one(<span class="string">"color"</span>)
.expect(<span class="string">"default"</span>);
<span class="macro">assert_eq!</span>(color, <span class="string">"never"</span>);</code></pre></div>
</div><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.from-5" class="method trait-impl"><a class="src rightside" href="../../src/clap_builder/builder/value_parser.rs.html#560-563">source</a><a href="#method.from-5" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.80.0/core/convert/trait.From.html#tymethod.from" class="fn">from</a>(values: <a class="struct" href="https://doc.rust-lang.org/1.80.0/alloc/vec/struct.Vec.html" title="struct alloc::vec::Vec">Vec</a>&lt;P&gt;) -&gt; Self</h4></section></summary><div class='docblock'>Converts to this type from the input type.</div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-IntoResettable%3CValueParser%3E-for-Option%3CValueParser%3E" class="impl"><a class="src rightside" href="../../src/clap_builder/builder/resettable.rs.html#106-113">source</a><a href="#impl-IntoResettable%3CValueParser%3E-for-Option%3CValueParser%3E" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="trait.IntoResettable.html" title="trait clap_builder::builder::IntoResettable">IntoResettable</a>&lt;<a class="struct" href="struct.ValueParser.html" title="struct clap_builder::builder::ValueParser">ValueParser</a>&gt; for <a class="enum" href="https://doc.rust-lang.org/1.80.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="struct" href="struct.ValueParser.html" title="struct clap_builder::builder::ValueParser">ValueParser</a>&gt;</h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.into_resettable" class="method trait-impl"><a class="src rightside" href="../../src/clap_builder/builder/resettable.rs.html#107-112">source</a><a href="#method.into_resettable" class="anchor">§</a><h4 class="code-header">fn <a href="trait.IntoResettable.html#tymethod.into_resettable" class="fn">into_resettable</a>(self) -&gt; <a class="enum" href="enum.Resettable.html" title="enum clap_builder::builder::Resettable">Resettable</a>&lt;<a class="struct" href="struct.ValueParser.html" title="struct clap_builder::builder::ValueParser">ValueParser</a>&gt;</h4></section></summary><div class='docblock'>Convert to the intended resettable type</div></details></div></details></div><h2 id="synthetic-implementations" class="section-header">Auto Trait Implementations<a href="#synthetic-implementations" class="anchor">§</a></h2><div id="synthetic-implementations-list"><section id="impl-Freeze-for-ValueParser" class="impl"><a href="#impl-Freeze-for-ValueParser" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/marker/trait.Freeze.html" title="trait core::marker::Freeze">Freeze</a> for <a class="struct" href="struct.ValueParser.html" title="struct clap_builder::builder::ValueParser">ValueParser</a></h3></section><section id="impl-RefUnwindSafe-for-ValueParser" class="impl"><a href="#impl-RefUnwindSafe-for-ValueParser" class="anchor">§</a><h3 class="code-header">impl !<a class="trait" href="https://doc.rust-lang.org/1.80.0/core/panic/unwind_safe/trait.RefUnwindSafe.html" title="trait core::panic::unwind_safe::RefUnwindSafe">RefUnwindSafe</a> for <a class="struct" href="struct.ValueParser.html" title="struct clap_builder::builder::ValueParser">ValueParser</a></h3></section><section id="impl-Send-for-ValueParser" class="impl"><a href="#impl-Send-for-ValueParser" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> for <a class="struct" href="struct.ValueParser.html" title="struct clap_builder::builder::ValueParser">ValueParser</a></h3></section><section id="impl-Sync-for-ValueParser" class="impl"><a href="#impl-Sync-for-ValueParser" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> for <a class="struct" href="struct.ValueParser.html" title="struct clap_builder::builder::ValueParser">ValueParser</a></h3></section><section id="impl-Unpin-for-ValueParser" class="impl"><a href="#impl-Unpin-for-ValueParser" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/marker/trait.Unpin.html" title="trait core::marker::Unpin">Unpin</a> for <a class="struct" href="struct.ValueParser.html" title="struct clap_builder::builder::ValueParser">ValueParser</a></h3></section><section id="impl-UnwindSafe-for-ValueParser" class="impl"><a href="#impl-UnwindSafe-for-ValueParser" class="anchor">§</a><h3 class="code-header">impl !<a class="trait" href="https://doc.rust-lang.org/1.80.0/core/panic/unwind_safe/trait.UnwindSafe.html" title="trait core::panic::unwind_safe::UnwindSafe">UnwindSafe</a> for <a class="struct" href="struct.ValueParser.html" title="struct clap_builder::builder::ValueParser">ValueParser</a></h3></section></div><h2 id="blanket-implementations" class="section-header">Blanket Implementations<a href="#blanket-implementations" class="anchor">§</a></h2><div id="blanket-implementations-list"><details class="toggle implementors-toggle"><summary><section id="impl-Any-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.80.0/src/core/any.rs.html#140">source</a><a href="#impl-Any-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T&gt; <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/any/trait.Any.html" title="trait core::any::Any">Any</a> for T<div class="where">where
T: 'static + ?<a class="trait" href="https://doc.rust-lang.org/1.80.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.type_id-1" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.80.0/src/core/any.rs.html#141">source</a><a href="#method.type_id-1" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.80.0/core/any/trait.Any.html#tymethod.type_id" class="fn">type_id</a>(&amp;self) -&gt; <a class="struct" href="https://doc.rust-lang.org/1.80.0/core/any/struct.TypeId.html" title="struct core::any::TypeId">TypeId</a></h4></section></summary><div class='docblock'>Gets the <code>TypeId</code> of <code>self</code>. <a href="https://doc.rust-lang.org/1.80.0/core/any/trait.Any.html#tymethod.type_id">Read more</a></div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-Borrow%3CT%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.80.0/src/core/borrow.rs.html#208">source</a><a href="#impl-Borrow%3CT%3E-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T&gt; <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/borrow/trait.Borrow.html" title="trait core::borrow::Borrow">Borrow</a>&lt;T&gt; for T<div class="where">where
T: ?<a class="trait" href="https://doc.rust-lang.org/1.80.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.borrow" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.80.0/src/core/borrow.rs.html#210">source</a><a href="#method.borrow" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.80.0/core/borrow/trait.Borrow.html#tymethod.borrow" class="fn">borrow</a>(&amp;self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.80.0/std/primitive.reference.html">&amp;T</a></h4></section></summary><div class='docblock'>Immutably borrows from an owned value. <a href="https://doc.rust-lang.org/1.80.0/core/borrow/trait.Borrow.html#tymethod.borrow">Read more</a></div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-BorrowMut%3CT%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.80.0/src/core/borrow.rs.html#216">source</a><a href="#impl-BorrowMut%3CT%3E-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T&gt; <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/borrow/trait.BorrowMut.html" title="trait core::borrow::BorrowMut">BorrowMut</a>&lt;T&gt; for T<div class="where">where
T: ?<a class="trait" href="https://doc.rust-lang.org/1.80.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.borrow_mut" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.80.0/src/core/borrow.rs.html#217">source</a><a href="#method.borrow_mut" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.80.0/core/borrow/trait.BorrowMut.html#tymethod.borrow_mut" class="fn">borrow_mut</a>(&amp;mut self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/1.80.0/std/primitive.reference.html">&amp;mut T</a></h4></section></summary><div class='docblock'>Mutably borrows from an owned value. <a href="https://doc.rust-lang.org/1.80.0/core/borrow/trait.BorrowMut.html#tymethod.borrow_mut">Read more</a></div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-From%3CT%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.80.0/src/core/convert/mod.rs.html#765">source</a><a href="#impl-From%3CT%3E-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T&gt; <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/convert/trait.From.html" title="trait core::convert::From">From</a>&lt;T&gt; for T</h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.from-9" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.80.0/src/core/convert/mod.rs.html#768">source</a><a href="#method.from-9" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.80.0/core/convert/trait.From.html#tymethod.from" class="fn">from</a>(t: T) -&gt; T</h4></section></summary><div class="docblock"><p>Returns the argument unchanged.</p>
</div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-Into%3CU%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.80.0/src/core/convert/mod.rs.html#748-750">source</a><a href="#impl-Into%3CU%3E-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T, U&gt; <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a>&lt;U&gt; for T<div class="where">where
U: <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/convert/trait.From.html" title="trait core::convert::From">From</a>&lt;T&gt;,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.into" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.80.0/src/core/convert/mod.rs.html#758">source</a><a href="#method.into" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.80.0/core/convert/trait.Into.html#tymethod.into" class="fn">into</a>(self) -&gt; U</h4></section></summary><div class="docblock"><p>Calls <code>U::from(self)</code>.</p>
<p>That is, this conversion is whatever the implementation of
<code><a href="https://doc.rust-lang.org/1.80.0/core/convert/trait.From.html" title="trait core::convert::From">From</a>&lt;T&gt; for U</code> chooses to do.</p>
</div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-IntoResettable%3CValueParser%3E-for-I" class="impl"><a class="src rightside" href="../../src/clap_builder/builder/resettable.rs.html#178-182">source</a><a href="#impl-IntoResettable%3CValueParser%3E-for-I" class="anchor">§</a><h3 class="code-header">impl&lt;I&gt; <a class="trait" href="trait.IntoResettable.html" title="trait clap_builder::builder::IntoResettable">IntoResettable</a>&lt;<a class="struct" href="struct.ValueParser.html" title="struct clap_builder::builder::ValueParser">ValueParser</a>&gt; for I<div class="where">where
I: <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a>&lt;<a class="struct" href="struct.ValueParser.html" title="struct clap_builder::builder::ValueParser">ValueParser</a>&gt;,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.into_resettable-1" class="method trait-impl"><a class="src rightside" href="../../src/clap_builder/builder/resettable.rs.html#179-181">source</a><a href="#method.into_resettable-1" class="anchor">§</a><h4 class="code-header">fn <a href="trait.IntoResettable.html#tymethod.into_resettable" class="fn">into_resettable</a>(self) -&gt; <a class="enum" href="enum.Resettable.html" title="enum clap_builder::builder::Resettable">Resettable</a>&lt;<a class="struct" href="struct.ValueParser.html" title="struct clap_builder::builder::ValueParser">ValueParser</a>&gt;</h4></section></summary><div class='docblock'>Convert to the intended resettable type</div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-ToOwned-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.80.0/src/alloc/borrow.rs.html#83-85">source</a><a href="#impl-ToOwned-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T&gt; <a class="trait" href="https://doc.rust-lang.org/1.80.0/alloc/borrow/trait.ToOwned.html" title="trait alloc::borrow::ToOwned">ToOwned</a> for T<div class="where">where
T: <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a>,</div></h3></section></summary><div class="impl-items"><details class="toggle" open><summary><section id="associatedtype.Owned" class="associatedtype trait-impl"><a href="#associatedtype.Owned" class="anchor">§</a><h4 class="code-header">type <a href="https://doc.rust-lang.org/1.80.0/alloc/borrow/trait.ToOwned.html#associatedtype.Owned" class="associatedtype">Owned</a> = T</h4></section></summary><div class='docblock'>The resulting type after obtaining ownership.</div></details><details class="toggle method-toggle" open><summary><section id="method.to_owned" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.80.0/src/alloc/borrow.rs.html#88">source</a><a href="#method.to_owned" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.80.0/alloc/borrow/trait.ToOwned.html#tymethod.to_owned" class="fn">to_owned</a>(&amp;self) -&gt; T</h4></section></summary><div class='docblock'>Creates owned data from borrowed data, usually by cloning. <a href="https://doc.rust-lang.org/1.80.0/alloc/borrow/trait.ToOwned.html#tymethod.to_owned">Read more</a></div></details><details class="toggle method-toggle" open><summary><section id="method.clone_into" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.80.0/src/alloc/borrow.rs.html#92">source</a><a href="#method.clone_into" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.80.0/alloc/borrow/trait.ToOwned.html#method.clone_into" class="fn">clone_into</a>(&amp;self, target: <a class="primitive" href="https://doc.rust-lang.org/1.80.0/std/primitive.reference.html">&amp;mut T</a>)</h4></section></summary><div class='docblock'>Uses borrowed data to replace owned data, usually by cloning. <a href="https://doc.rust-lang.org/1.80.0/alloc/borrow/trait.ToOwned.html#method.clone_into">Read more</a></div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-TryFrom%3CU%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.80.0/src/core/convert/mod.rs.html#805-807">source</a><a href="#impl-TryFrom%3CU%3E-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T, U&gt; <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a>&lt;U&gt; for T<div class="where">where
U: <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a>&lt;T&gt;,</div></h3></section></summary><div class="impl-items"><details class="toggle" open><summary><section id="associatedtype.Error" class="associatedtype trait-impl"><a href="#associatedtype.Error" class="anchor">§</a><h4 class="code-header">type <a href="https://doc.rust-lang.org/1.80.0/core/convert/trait.TryFrom.html#associatedtype.Error" class="associatedtype">Error</a> = <a class="enum" href="https://doc.rust-lang.org/1.80.0/core/convert/enum.Infallible.html" title="enum core::convert::Infallible">Infallible</a></h4></section></summary><div class='docblock'>The type returned in the event of a conversion error.</div></details><details class="toggle method-toggle" open><summary><section id="method.try_from" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.80.0/src/core/convert/mod.rs.html#812">source</a><a href="#method.try_from" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.80.0/core/convert/trait.TryFrom.html#tymethod.try_from" class="fn">try_from</a>(value: U) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.80.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;T, &lt;T as <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a>&lt;U&gt;&gt;::<a class="associatedtype" href="https://doc.rust-lang.org/1.80.0/core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a>&gt;</h4></section></summary><div class='docblock'>Performs the conversion.</div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-TryInto%3CU%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.80.0/src/core/convert/mod.rs.html#790-792">source</a><a href="#impl-TryInto%3CU%3E-for-T" class="anchor">§</a><h3 class="code-header">impl&lt;T, U&gt; <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/convert/trait.TryInto.html" title="trait core::convert::TryInto">TryInto</a>&lt;U&gt; for T<div class="where">where
U: <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a>&lt;T&gt;,</div></h3></section></summary><div class="impl-items"><details class="toggle" open><summary><section id="associatedtype.Error-1" class="associatedtype trait-impl"><a href="#associatedtype.Error-1" class="anchor">§</a><h4 class="code-header">type <a href="https://doc.rust-lang.org/1.80.0/core/convert/trait.TryInto.html#associatedtype.Error" class="associatedtype">Error</a> = &lt;U as <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a>&lt;T&gt;&gt;::<a class="associatedtype" href="https://doc.rust-lang.org/1.80.0/core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a></h4></section></summary><div class='docblock'>The type returned in the event of a conversion error.</div></details><details class="toggle method-toggle" open><summary><section id="method.try_into" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.80.0/src/core/convert/mod.rs.html#797">source</a><a href="#method.try_into" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.80.0/core/convert/trait.TryInto.html#tymethod.try_into" class="fn">try_into</a>(self) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.80.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;U, &lt;U as <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a>&lt;T&gt;&gt;::<a class="associatedtype" href="https://doc.rust-lang.org/1.80.0/core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a>&gt;</h4></section></summary><div class='docblock'>Performs the conversion.</div></details></div></details></div></section></div></main></body></html>
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