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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="Register a type with `value_parser!`"><title>ValueParserFactory 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 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" 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">4.5.13</span></h2></div><h2 class="location"><a href="#">ValueParserFactory</a></h2><div class="sidebar-elems"><section><h3><a href="#required-associated-types">Required Associated Types</a></h3><ul class="block"><li><a href="#associatedtype.Parser">Parser</a></li></ul><h3><a href="#required-methods">Required Methods</a></h3><ul class="block"><li><a href="#tymethod.value_parser">value_parser</a></li></ul><h3><a href="#foreign-impls">Implementations on Foreign Types</a></h3><ul class="block"><li><a href="#impl-ValueParserFactory-for-Arc%3CT%3E">Arc&lt;T&gt;</a></li><li><a href="#impl-ValueParserFactory-for-Box%3COsStr%3E">Box&lt;OsStr&gt;</a></li><li><a href="#impl-ValueParserFactory-for-Box%3CPath%3E">Box&lt;Path&gt;</a></li><li><a href="#impl-ValueParserFactory-for-Box%3CT%3E">Box&lt;T&gt;</a></li><li><a href="#impl-ValueParserFactory-for-Box%3Cstr%3E">Box&lt;str&gt;</a></li><li><a href="#impl-ValueParserFactory-for-OsString">OsString</a></li><li><a href="#impl-ValueParserFactory-for-PathBuf">PathBuf</a></li><li><a href="#impl-ValueParserFactory-for-String">String</a></li><li><a href="#impl-ValueParserFactory-for-Wrapping%3CT%3E">Wrapping&lt;T&gt;</a></li><li><a href="#impl-ValueParserFactory-for-bool">bool</a></li><li><a href="#impl-ValueParserFactory-for-i16">i16</a></li><li><a href="#impl-ValueParserFactory-for-i32">i32</a></li><li><a href="#impl-ValueParserFactory-for-i64">i64</a></li><li><a href="#impl-ValueParserFactory-for-i8">i8</a></li><li><a href="#impl-ValueParserFactory-for-u16">u16</a></li><li><a href="#impl-ValueParserFactory-for-u32">u32</a></li><li><a href="#impl-ValueParserFactory-for-u64">u64</a></li><
type <a href="#associatedtype.Parser" class="associatedtype">Parser</a>;
// Required method
fn <a href="#tymethod.value_parser" class="fn">value_parser</a>() -&gt; Self::<a class="associatedtype" href="trait.ValueParserFactory.html#associatedtype.Parser" title="type clap_builder::builder::ValueParserFactory::Parser">Parser</a>;
}</code></pre><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Register a type with <a href="../macro.value_parser.html" title="macro clap_builder::value_parser"><code>value_parser!</code></a></p>
<h2 id="example"><a class="doc-anchor" href="#example">§</a>Example</h2>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="attr">#[derive(Copy, Clone, Debug)]
</span><span class="kw">pub struct </span>Custom(u32);
<span class="kw">impl </span>clap::builder::ValueParserFactory <span class="kw">for </span>Custom {
<span class="kw">type </span>Parser = CustomValueParser;
<span class="kw">fn </span>value_parser() -&gt; <span class="self">Self</span>::Parser {
CustomValueParser
}
}
<span class="attr">#[derive(Clone, Debug)]
</span><span class="kw">pub struct </span>CustomValueParser;
<span class="kw">impl </span>clap::builder::TypedValueParser <span class="kw">for </span>CustomValueParser {
<span class="kw">type </span>Value = Custom;
<span class="kw">fn </span>parse_ref(
<span class="kw-2">&amp;</span><span class="self">self</span>,
cmd: <span class="kw-2">&amp;</span>clap::Command,
arg: <span class="prelude-ty">Option</span>&lt;<span class="kw-2">&amp;</span>clap::Arg&gt;,
value: <span class="kw-2">&amp;</span>std::ffi::OsStr,
) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>::Value, clap::Error&gt; {
<span class="kw">let </span>inner = <span class="macro">clap::value_parser!</span>(u32);
<span class="kw">let </span>val = inner.parse_ref(cmd, arg, value)<span class="question-mark">?</span>;
<span class="prelude-val">Ok</span>(Custom(val))
}
}
<span class="kw">let </span>parser: CustomValueParser = <span class="macro">clap::value_parser!</span>(Custom);</code></pre></div>
</div></details><h2 id="required-associated-types" class="section-header">Required Associated Types<a href="#required-associated-types" class="anchor">§</a></h2><div class="methods"><details class="toggle" open><summary><section id="associatedtype.Parser" class="method"><a class="src rightside" href="../../src/clap_builder/builder/value_parser.rs.html#2277">source</a><h4 class="code-header">type <a href="#associatedtype.Parser" class="associatedtype">Parser</a></h4></section></summary><div class="docblock"><p>Generated parser, usually <a href="struct.ValueParser.html" title="struct clap_builder::builder::ValueParser"><code>ValueParser</code></a>.</p>
<p>It should at least be a type that supports <code>Into&lt;ValueParser&gt;</code>. A non-<code>ValueParser</code> type
allows the caller to do further initialization on the parser.</p>
</div></details></div><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_parser" class="method"><a class="src rightside" href="../../src/clap_builder/builder/value_parser.rs.html#2280">source</a><h4 class="code-header">fn <a href="#tymethod.value_parser" class="fn">value_parser</a>() -&gt; Self::<a class="associatedtype" href="trait.ValueParserFactory.html#associatedtype.Parser" title="type clap_builder::builder::ValueParserFactory::Parser">Parser</a></h4></section></summary><div class="docblock"><p>Create the specified <a href="trait.ValueParserFactory.html#associatedtype.Parser"><code>Self::Parser</code></a></p>
</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/1.80.0/reference/items/traits.html#object-safety">object safe</a>.</div><h2 id="foreign-impls" class="section-header">Implementations on Foreign Types<a href="#foreign-impls" class="anchor">§</a></h2><details class="toggle implementors-toggle"><summary><section id="impl-ValueParserFactory-for-bool" class="impl"><a class="src rightside" href="../../src/clap_builder/builder/value_parser.rs.html#2320-2325">source</a><a href="#impl-ValueParserFactory-for-bool" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="trait.ValueParserFactory.html" title="trait clap_builder::builder::ValueParserFactory">ValueParserFactory</a> for <a class="primitive" href="https://doc.rust-lang.org/1.80.0/std/primitive.bool.html">bool</a></h3></section></summary><div class="impl-items"><section id="associatedtype.Parser-1" class="associatedtype trait-impl"><a href="#associatedtype.Parser-1" class="anchor">§</a><h4 class="code-header">type <a href="#associatedtype.Parser" class="associatedtype">Parser</a> = <a class="struct" href="struct.ValueParser.html" title="struct clap_builder::builder::ValueParser">ValueParser</a></h4></section><section id="method.value_parser" class="method trait-impl"><a class="src rightside" href="../../src/clap_builder/builder/value_parser.rs.html#2322-2324">source</a><a href="#method.value_parser" class="anchor">§</a><h4 class="code-header">fn <a href="#tymethod.value_parser" class="fn">value_parser</a>() -&gt; Self::<a class="associatedtype" href="trait.ValueParserFactory.html#associatedtype.Parser" title="type clap_builder::builder::ValueParserFactory::Parser">Parser</a></h4></section></div></details><details class="toggle implementors-toggle"><summary><section id="impl-ValueParserFactory-for-i8" class="impl"><a class="src rightside" href="../../src/clap_builder/builder/value_parser.rs.html#2334-2341">source</a><a href="#impl-ValueParserFactory-for-i8" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="trait.ValueParserFactory.html" title="trait clap_builder::builder::ValueParserFactory">ValueParserFactory</a> for <a class="primitive" href="https://doc.rust-lang.org/1.80.0/std/primitive.i8.html">i8</a></h3></section></summary><div class="impl-items"><section id="associatedtype.Parser-2" class="associatedtype trait-impl"><a href="#associatedtype.Parser-2" class="anchor">§</a><h4 class="code-header">type <a href="#associatedtype.Parser" class="associatedtype">Parser</a> = <a class="struct" href="struct.RangedI64ValueParser.html" title="struct clap_builder::builder::RangedI64ValueParser">RangedI64ValueParser</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.80.0/std/primitive.i8.html">i8</a>&gt;</h4></section><section id="method.value_parser-1" class="method trait-impl"><a class="src rightside" href="../../src/clap_builder/builder/value_parser.rs.html#2336-2340">source</a><a href="#method.value_parser-1" class="anchor">§</a><h4 class="code-header">fn <a href="#tymethod.value_parser" class="fn">value_parser</a>() -&gt; Self::<a class="associatedtype" href="trait.ValueParserFactory.html#associatedtype.Parser" title="type clap_builder::builder::ValueParserFactory::Parser">Parser</a></h4></section></div></details><details class="toggle implementors-toggle"><summary><section id="impl-ValueParserFactory-for-i16" class="impl"><a class="src rightside" href="../../src/clap_builder/builder/value_parser.rs.html#2350-2357">source</a><a href="#impl-ValueParserFactory-for-i16" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="trait.ValueParserFactory.html" title="trait clap_builder::builder::ValueParserFactory">ValueParserFactory</a> for <a class="primitive" href="https://doc.rust-lang.org/1.80.0/std/primitive.i16.html">i16</a></h3></section></summary><div class="impl-items"><section id="associatedtype.Parser-3" class="associatedtype
T: <a class="trait" href="trait.ValueParserFactory.html" title="trait clap_builder::builder::ValueParserFactory">ValueParserFactory</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> + <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a>,
&lt;T as <a class="trait" href="trait.ValueParserFactory.html" title="trait clap_builder::builder::ValueParserFactory">ValueParserFactory</a>&gt;::<a class="associatedtype" href="trait.ValueParserFactory.html#associatedtype.Parser" title="type clap_builder::builder::ValueParserFactory::Parser">Parser</a>: <a class="trait" href="trait.TypedValueParser.html" title="trait clap_builder::builder::TypedValueParser">TypedValueParser</a>&lt;Value = T&gt;,</div></h3></section></summary><div class="impl-items"><section id="associatedtype.Parser-16" class="associatedtype trait-impl"><a href="#associatedtype.Parser-16" class="anchor">§</a><h4 class="code-header">type <a href="#associatedtype.Parser" class="associatedtype">Parser</a> = <a class="struct" href="struct.MapValueParser.html" title="struct clap_builder::builder::MapValueParser">MapValueParser</a>&lt;&lt;T as <a class="trait" href="trait.ValueParserFactory.html" title="trait clap_builder::builder::ValueParserFactory">ValueParserFactory</a>&gt;::<a class="associatedtype" href="trait.ValueParserFactory.html#associatedtype.Parser" title="type clap_builder::builder::ValueParserFactory::Parser">Parser</a>, <a class="primitive" href="https://doc.rust-lang.org/1.80.0/std/primitive.fn.html">fn</a>(_: T) -&gt; <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;T&gt;&gt;</h4></section><section id="method.value_parser-15" class="method trait-impl"><a class="src rightside" href="../../src/clap_builder/builder/value_parser.rs.html#2404-2406">source</a><a href="#method.value_parser-15" class="anchor">§</a><h4 class="code-header">fn <a href="#tymethod.value_parser" class="fn">value_parser</a>() -&gt; Self::<a class="associatedtype" href="trait.ValueParserFactory.html#associatedtype.Parser" title="type clap_builder::builder::ValueParserFactory::Parser">Parser</a></h4></section></div></details><details class="toggle implementors-toggle"><summary><section id="impl-ValueParserFactory-for-Arc%3CT%3E" class="impl"><a class="src rightside" href="../../src/clap_builder/builder/value_parser.rs.html#2408-2418">source</a><a href="#impl-ValueParserFactory-for-Arc%3CT%3E" class="anchor">§</a><h3 class="code-header">impl&lt;T&gt; <a class="trait" href="trait.ValueParserFactory.html" title="trait clap_builder::builder::ValueParserFactory">ValueParserFactory</a> for <a class="struct" href="https://doc.rust-lang.org/1.80.0/alloc/sync/struct.Arc.html" title="struct alloc::sync::Arc">Arc</a>&lt;T&gt;<div class="where">where
T: <a class="trait" href="trait.ValueParserFactory.html" title="trait clap_builder::builder::ValueParserFactory">ValueParserFactory</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> + <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a>,
&lt;T as <a class="trait" href="trait.ValueParserFactory.html" title="trait clap_builder::builder::ValueParserFactory">ValueParserFactory</a>&gt;::<a class="associatedtype" href="trait.ValueParserFactory.html#associatedtype.Parser" title="type clap_builder::builder::ValueParserFactory::Parser">Parser</a>: <a class="trait" href="trait.TypedValueParser.html" title="trait clap_builder::builder::TypedValueParser">TypedValueParser</a>&lt;Value = T&gt;,</div></h3></section></summary><div class="impl-items"><section id="associatedtype.Parser-17" class="associatedtype trait-impl"><a href="#associatedtype.Parser-17" class="anchor">§</a><h4 class="code-header">type <a href="#associatedtype.Parser" class="associatedtype">Parser</a> = <a class="struct" href="struct.MapValueParser.html" title="struct clap_builder::builder::MapValueParser">MapValueParser</a>&lt;&lt;T as <a class="trait" href="trait.ValueParserFactory.html" title="trait clap_builder::builder::ValueParserFactory">ValueParserFactory</a>&gt;::<a class="associatedtype" href="trait.ValueParserFactory.html#associatedtype.Parser" title="type clap_builder::builder::ValueParserFactory::Parser">Parser</a>, <a class="primitive" href="https://doc.rust-lang.org/1.80.0/std/primitive.fn.html">fn</a>(_: T) -&gt; <a class="struct" href="https://doc.rust-lang.org/1.80.0/alloc/sync/struct.Arc.html" title="struct alloc::sync::Arc">Arc</a>&lt;T&gt;&gt;</h4></section><section id="method.value_parser-16" class="method trait-impl"><a class="src rightside" href="../../src/clap_builder/builder/value_parser.rs.html#2415-2417">source</a><a href="#method.value_parser-16" class="anchor">§</a><h4 class="code-header">fn <a href="#tymethod.value_parser" class="fn">value_parser</a>() -&gt; Self::<a class="associatedtype" href="trait.ValueParserFactory.html#associatedtype.Parser" title="type clap_builder::builder::ValueParserFactory::Parser">Parser</a></h4></section></div></details><details class="toggle implementors-toggle"><summary><section id="impl-ValueParserFactory-for-Wrapping%3CT%3E" class="impl"><a class="src rightside" href="../../src/clap_builder/builder/value_parser.rs.html#2386-2396">source</a><a href="#impl-ValueParserFactory-for-Wrapping%3CT%3E" class="anchor">§</a><h3 class="code-header">impl&lt;T&gt; <a class="trait" href="trait.ValueParserFactory.html" title="trait clap_builder::builder::ValueParserFactory">ValueParserFactory</a> for <a class="struct" href="https://doc.rust-lang.org/1.80.0/core/num/wrapping/struct.Wrapping.html" title="struct core::num::wrapping::Wrapping">Wrapping</a>&lt;T&gt;<div class="where">where
T: <a class="trait" href="trait.ValueParserFactory.html" title="trait clap_builder::builder::ValueParserFactory">ValueParserFactory</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> + <a class="trait" href="https://doc.rust-lang.org/1.80.0/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a>,
&lt;T as <a class="trait" href="trait.ValueParserFactory.html" title="trait clap_builder::builder::ValueParserFactory">ValueParserFactory</a>&gt;::<a class="associatedtype" href="trait.ValueParserFactory.html#associatedtype.Parser" title="type clap_builder::builder::ValueParserFactory::Parser">Parser</a>: <a class="trait" href="trait.TypedValueParser.html" title="trait clap_builder::builder::TypedValueParser">TypedValueParser</a>&lt;Value = T&gt;,</div></h3></section></summary><div class="impl-items"><section id="associatedtype.Parser-18" class="associatedtype trait-impl"><a href="#associatedtype.Parser-18" class="anchor">§</a><h4 class="code-header">type <a href="#associatedtype.Parser" class="associatedtype">Parser</a> = <a class="struct" href="struct.MapValueParser.html" title="struct clap_builder::builder::MapValueParser">MapValueParser</a>&lt;&lt;T as <a class="trait" href="trait.ValueParserFactory.html" title="trait clap_builder::builder::ValueParserFactory">ValueParserFactory</a>&gt;::<a class="associatedtype" href="trait.ValueParserFactory.html#associatedtype.Parser" title="type clap_builder::builder::ValueParserFactory::Parser">Parser</a>, <a class="primitive" href="https://doc.rust-lang.org/1.80.0/std/primitive.fn.html">fn</a>(_: T) -&gt; <a class="struct" href="https://doc.rust-lang.org/1.80.0/core/num/wrapping/struct.Wrapping.html" title="struct core::num::wrapping::Wrapping">Wrapping</a>&lt;T&gt;&gt;</h4></section><section id="method.value_parser-17" class="method trait-impl"><a class="src rightside" href="../../src/clap_builder/builder/value_parser.rs.html#2393-2395">source</a><a href="#method.value_parser-17" class="anchor">§</a><h4 class="code-header">fn <a href="#tymethod.value_parser" class="fn">value_parser</a>() -&gt; Self::<a class="associatedtype" href="trait.ValueParserFactory.html#associatedtype.Parser" title="type clap_builder::builder::ValueParserFactory::Parser">Parser</a></h4></section></div></details><h2 id="implementors" class="section-header">Implementors<a href="#implementors" class="anchor">§</a></h2><div id="implementors-list"></div><script src="../../trait.impl/clap_builder/builder/value_parser/trait.ValueParserFactory.js" data-ignore-extern-crates="alloc,core,std" async></script></section></div></main></body></html>