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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="A meta-item that can be present as a word - with no value - or absent."><title>Flag in darling::util - Rust</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/SourceSerif4-Regular-46f98efaafac5295.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/FiraSans-Regular-018c141bf0843ffd.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/FiraSans-Medium-8f9a781e4970d388.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/SourceCodePro-Regular-562dcc5011b6de7d.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/SourceCodePro-Semibold-d899c5a5c4aeb14a.ttf.woff2"><link rel="stylesheet" href="../../static.files/normalize-76eba96aa4d2e634.css"><link rel="stylesheet" href="../../static.files/rustdoc-ac92e1bbe349e143.css"><meta name="rustdoc-vars" data-root-path="../../" data-static-root-path="../../static.files/" data-current-crate="darling" data-themes="" data-resource-suffix="" data-rustdoc-version="1.76.0 (07dca489a 2024-02-04)" data-channel="1.76.0" data-search-js="search-2b6ce74ff89ae146.js" data-settings-js="settings-4313503d2e1961c2.js" ><script src="../../static.files/storage-f2adc0d6ca4d09fb.js"></script><script defer src="sidebar-items.js"></script><script defer src="../../static.files/main-305769736d49e732.js"></script><noscript><link rel="stylesheet" href="../../static.files/noscript-feafe1bb7466e4bd.css"></noscript><link rel="alternate icon" type="image/png" href="../../static.files/favicon-16x16-8b506e7a72182f1c.png"><link rel="alternate icon" type="image/png" href="../../static.files/favicon-32x32-422f7d1d52889060.png"><link rel="icon" type="image/svg+xml" href="../../static.files/favicon-2c020d218678b618.svg"></head><body class="rustdoc 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">☰</button></nav><nav class="sidebar"><div class="sidebar-crate"><h2><a href="../../darling/index.html">darling</a><span class="version">0.20.3</span></h2></div><h2 class="location"><a href="#">Flag</a></h2><div class="sidebar-elems"><section><h3><a href="#implementations">Methods</a></h3><ul class="block method"><li><a href="#method.is_present">is_present</a></li><li><a href="#method.is_some">is_some</a></li><li><a href="#method.present">present</a></li></ul><h3><a href="#trait-implementations">Trait Implementations</a></h3><ul class="block trait-implementation"><li><a href="#impl-Clone-for-Flag">Clone</a></li><li><a href="#impl-Copy-for-Flag">Copy</a></li><li><a href="#impl-Debug-for-Flag">Debug</a></li><li><a href="#impl-Default-for-Flag">Default</a></li><li><a href="#impl-From%3CFlag%3E-for-bool">From<Flag></a></li><li><a href="#impl-From%3Cbool%3E-for-Flag">From<bool></a></li><li><a href="#impl-FromMeta-for-Flag">FromMeta</a></li></ul><h3><a href="#synthetic-implementations">Auto Trait Implementations</a></h3><ul class="block synthetic-implementation"><li><a href="#impl-Send-for-Flag">!Send</a></li><li><a href="#impl-Sync-for-Flag">!Sync</a></li><li><a href="#impl-RefUnwindSafe-for-Flag">RefUnwindSafe</a></li><li><a href="#impl-Unpin-for-Flag">Unpin</a></li><li><a href="#impl-UnwindSafe-for-Flag">UnwindSafe</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<T></a></li><li><a href="#impl-BorrowMut%3CT%3E-for-T">BorrowMut<T></a></li><li><a href="#impl-From%3CT%3E-for-T">From<T></a></li><li><a href="#impl-Into%3CU%3E-for-T">Into<U></a></li><li><a href="#impl-ToOwned-for-T">ToOwned</a></li><li><a href="#impl-TryFrom%3CU%3E-for-T">TryFrom<U></a></li><li><a href="#impl-TryInto%3CU%3E-for-T">TryInto<U></a></li></ul></section><h2><a href="index.html">In darling::util</a></h2></div></nav><div class="sidebar-resizer"></div>
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<main><div class="width-limiter"><nav class="sub"><form class="search-form"><span></span><div id="sidebar-button" tabindex="-1"><a href="../../darling/all.html" title="show sidebar"></a></div><input class="search-input" name="search" aria-label="Run search in the documentation" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" tabindex="-1"><a href="../../help.html" title="help">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../static.files/wheel-7b819b6101059cd0.svg"></a></div></form></nav><section id="main-content" class="content"><div class="main-heading"><h1>Struct <a href="../index.html">darling</a>::<wbr><a href="index.html">util</a>::<wbr><a class="struct" href="#">Flag</a><button id="copy-path" title="Copy item path to clipboard"><img src="../../static.files/clipboard-7571035ce49a181d.svg" width="19" height="18" alt="Copy item path"></button></h1><span class="out-of-band"><a class="src" href="../../src/darling_core/util/flag.rs.html#45">source</a> · <button id="toggle-all-docs" title="collapse all docs">[<span>−</span>]</button></span></div><pre class="rust item-decl"><code>pub struct Flag(<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>A meta-item that can be present as a word - with no value - or absent.</p>
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<h2 id="defaulting"><a href="#defaulting">Defaulting</a></h2>
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<p>Like <code>Option</code>, <code>Flag</code> does not require <code>#[darling(default)]</code> to be optional.
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If the caller does not include the property, then an absent <code>Flag</code> will be included
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in the receiver struct.</p>
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<h2 id="spans"><a href="#spans">Spans</a></h2>
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<p><code>Flag</code> keeps the span where its word was seen.
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This enables attaching custom error messages to the word, such as in the case of two
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conflicting flags being present.</p>
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<h2 id="example"><a href="#example">Example</a></h2>
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<div class="example-wrap ignore"><a href="#" class="tooltip" title="This example is not tested">ⓘ</a><pre class="rust rust-example-rendered"><code><span class="attr">#[derive(FromMeta)]
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#[darling(and_then = <span class="string">"Self::not_both"</span>)]
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</span><span class="kw">struct </span>Demo {
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flag_a: Flag,
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flag_b: Flag,
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}
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<span class="kw">impl </span>Demo {
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<span class="kw">fn </span>not_both(<span class="self">self</span>) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>> {
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<span class="kw">if </span><span class="self">self</span>.flag_a.is_present() && <span class="self">self</span>.flag_b.is_present() {
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<span class="prelude-val">Err</span>(Error::custom(<span class="string">"Cannot set flag_a and flag_b"</span>).with_span(<span class="self">self</span>.flag_b))
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} <span class="kw">else </span>{
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<span class="prelude-val">Ok</span>(<span class="self">self</span>)
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}
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}
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}</code></pre></div>
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<p>The above struct would then produce the following error.</p>
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<div class="example-wrap ignore"><a href="#" class="tooltip" title="This example is not tested">ⓘ</a><pre class="rust rust-example-rendered"><code><span class="attr">#[example(flag_a, flag_b)]
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</span><span class="comment">// ^^^^^^ Cannot set flag_a and flag_b</span></code></pre></div>
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</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-Flag" class="impl"><a class="src rightside" href="../../src/darling_core/util/flag.rs.html#47">source</a><a href="#impl-Flag" class="anchor">§</a><h3 class="code-header">impl <a class="struct" href="struct.Flag.html" title="struct darling::util::Flag">Flag</a></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.present" class="method"><a class="src rightside" href="../../src/darling_core/util/flag.rs.html#49">source</a><h4 class="code-header">pub fn <a href="#method.present" class="fn">present</a>() -> <a class="struct" href="struct.Flag.html" title="struct darling::util::Flag">Flag</a></h4></section></summary><div class="docblock"><p>Creates a new <code>Flag</code> which corresponds to the presence of a value.</p>
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</div></details><details class="toggle method-toggle" open><summary><section id="method.is_present" class="method"><a class="src rightside" href="../../src/darling_core/util/flag.rs.html#54">source</a><h4 class="code-header">pub fn <a href="#method.is_present" class="fn">is_present</a>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.bool.html">bool</a></h4></section></summary><div class="docblock"><p>Check if the flag is present.</p>
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</div></details><section id="method.is_some" class="method"><a class="src rightside" href="../../src/darling_core/util/flag.rs.html#59">source</a><h4 class="code-header">pub fn <a href="#method.is_some" class="fn">is_some</a>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.bool.html">bool</a></h4></section><span class="item-info"><div class="stab deprecated"><span class="emoji">👎</span><span>Deprecated since 0.14.0: Use Flag::is_present</span></div></span></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-Flag" class="impl"><a class="src rightside" href="../../src/darling_core/util/flag.rs.html#44">source</a><a href="#impl-Clone-for-Flag" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a> for <a class="struct" href="struct.Flag.html" title="struct darling::util::Flag">Flag</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/darling_core/util/flag.rs.html#44">source</a><a href="#method.clone" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.76.0/core/clone/trait.Clone.html#tymethod.clone" class="fn">clone</a>(&self) -> <a class="struct" href="struct.Flag.html" title="struct darling::util::Flag">Flag</a></h4></section></summary><div class='docblock'>Returns a copy of the value. <a href="https://doc.rust-lang.org/1.76.0/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/1.76.0/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/1.76.0/core/clone/trait.Clone.html#method.clone_from" class="fn">clone_from</a>(&mut self, source: <a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.reference.html">&Self</a>)</h4></section></summary><div class='docblock'>Performs copy-assignment from <code>source</code>. <a href="https://doc.rust-lang.org/1.76.0/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-Flag" class="impl"><a class="src rightside" href="../../src/darling_core/util/flag.rs.html#44">source</a><a href="#impl-Debug-for-Flag" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a> for <a class="struct" href="struct.Flag.html" title="struct darling::util::Flag">Flag</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/darling_core/util/flag.rs.html#44">source</a><a href="#method.fmt" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.76.0/core/fmt/trait.Debug.html#tymethod.fmt" class="fn">fmt</a>(&self, f: &mut <a class="struct" href="https://doc.rust-lang.org/1.76.0/core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a><'_>) -> <a class="enum" href="https://doc.rust-lang.org/1.76.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.unit.html">()</a>, <a class="struct" href="https://doc.rust-lang.org/1.76.0/core/fmt/struct.Error.html" title="struct core::fmt::Error">Error</a>></h4></section></summary><div class='docblock'>Formats the value using the given formatter. <a href="https://doc.rust-lang.org/1.76.0/core/fmt/trait.Debug.html#tymethod.fmt">Read more</a></div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-Default-for-Flag" class="impl"><a class="src rightside" href="../../src/darling_core/util/flag.rs.html#44">source</a><a href="#impl-Default-for-Flag" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/default/trait.Default.html" title="trait core::default::Default">Default</a> for <a class="struct" href="struct.Flag.html" title="struct darling::util::Flag">Flag</a></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.default" class="method trait-impl"><a class="src rightside" href="../../src/darling_core/util/flag.rs.html#44">source</a><a href="#method.default" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.76.0/core/default/trait.Default.html#tymethod.default" class="fn">default</a>() -> <a class="struct" href="struct.Flag.html" title="struct darling::util::Flag">Flag</a></h4></section></summary><div class='docblock'>Returns the “default value” for a type. <a href="https://doc.rust-lang.org/1.76.0/core/default/trait.Default.html#tymethod.default">Read more</a></div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-From%3CFlag%3E-for-bool" class="impl"><a class="src rightside" href="../../src/darling_core/util/flag.rs.html#80">source</a><a href="#impl-From%3CFlag%3E-for-bool" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/convert/trait.From.html" title="trait core::convert::From">From</a><<a class="struct" href="struct.Flag.html" title="struct darling::util::Flag">Flag</a>> for <a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.bool.html">bool</a></h3></section></summary><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/darling_core/util/flag.rs.html#81">source</a><a href="#method.from-1" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.76.0/core/convert/trait.From.html#tymethod.from" class="fn">from</a>(flag: <a class="struct" href="struct.Flag.html" title="struct darling::util::Flag">Flag</a>) -> <a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.bool.html">bool</a></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%3Cbool%3E-for-Flag" class="impl"><a class="src rightside" href="../../src/darling_core/util/flag.rs.html#86">source</a><a href="#impl-From%3Cbool%3E-for-Flag" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/convert/trait.From.html" title="trait core::convert::From">From</a><<a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.bool.html">bool</a>> for <a class="struct" href="struct.Flag.html" title="struct darling::util::Flag">Flag</a></h3></section></summary><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/darling_core/util/flag.rs.html#87">source</a><a href="#method.from" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.76.0/core/convert/trait.From.html#tymethod.from" class="fn">from</a>(v: <a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.bool.html">bool</a>) -> <a class="struct" href="struct.Flag.html" title="struct darling::util::Flag">Flag</a></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-FromMeta-for-Flag" class="impl"><a class="src rightside" href="../../src/darling_core/util/flag.rs.html#64">source</a><a href="#impl-FromMeta-for-Flag" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="../trait.FromMeta.html" title="trait darling::FromMeta">FromMeta</a> for <a class="struct" href="struct.Flag.html" title="struct darling::util::Flag">Flag</a></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.from_none" class="method trait-impl"><a class="src rightside" href="../../src/darling_core/util/flag.rs.html#65">source</a><a href="#method.from_none" class="anchor">§</a><h4 class="code-header">fn <a href="../trait.FromMeta.html#method.from_none" class="fn">from_none</a>() -> <a class="enum" href="https://doc.rust-lang.org/1.76.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a><<a class="struct" href="struct.Flag.html" title="struct darling::util::Flag">Flag</a>></h4></section></summary><div class='docblock'>When a field is omitted from a parent meta-item, <code>from_none</code> is used to attempt
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recovery before a missing field error is generated. <a href="../trait.FromMeta.html#method.from_none">Read more</a></div></details><details class="toggle method-toggle" open><summary><section id="method.from_meta" class="method trait-impl"><a class="src rightside" href="../../src/darling_core/util/flag.rs.html#69">source</a><a href="#method.from_meta" class="anchor">§</a><h4 class="code-header">fn <a href="../trait.FromMeta.html#method.from_meta" class="fn">from_meta</a>(mi: &<a class="enum" href="../../syn/attr/enum.Meta.html" title="enum syn::attr::Meta">Meta</a>) -> <a class="enum" href="https://doc.rust-lang.org/1.76.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="struct" href="struct.Flag.html" title="struct darling::util::Flag">Flag</a>, <a class="struct" href="../error/struct.Error.html" title="struct darling::error::Error">Error</a>></h4></section></summary><div class='docblock'>Create an instance from a <code>syn::Meta</code> by dispatching to the format-appropriate
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trait function. This generally should not be overridden by implementers. <a href="../trait.FromMeta.html#method.from_meta">Read more</a></div></details><section id="method.from_nested_meta" class="method trait-impl"><a class="src rightside" href="../../src/darling_core/from_meta.rs.html#52">source</a><a href="#method.from_nested_meta" class="anchor">§</a><h4 class="code-header">fn <a href="../trait.FromMeta.html#method.from_nested_meta" class="fn">from_nested_meta</a>(item: &<a class="enum" href="../ast/enum.NestedMeta.html" title="enum darling::ast::NestedMeta">NestedMeta</a>) -> <a class="enum" href="https://doc.rust-lang.org/1.76.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><Self, <a class="struct" href="../error/struct.Error.html" title="struct darling::error::Error">Error</a>></h4></section><details class="toggle method-toggle" open><summary><section id="method.from_word" class="method trait-impl"><a class="src rightside" href="../../src/darling_core/from_meta.rs.html#95">source</a><a href="#method.from_word" class="anchor">§</a><h4 class="code-header">fn <a href="../trait.FromMeta.html#method.from_word" class="fn">from_word</a>() -> <a class="enum" href="https://doc.rust-lang.org/1.76.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><Self, <a class="struct" href="../error/struct.Error.html" title="struct darling::error::Error">Error</a>></h4></section></summary><div class='docblock'>Create an instance from the presence of the word in the attribute with no
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additional options specified.</div></details><details class="toggle method-toggle" open><summary><section id="method.from_list" class="method trait-impl"><a class="src rightside" href="../../src/darling_core/from_meta.rs.html#101">source</a><a href="#method.from_list" class="anchor">§</a><h4 class="code-header">fn <a href="../trait.FromMeta.html#method.from_list" class="fn">from_list</a>(items: &[<a class="enum" href="../ast/enum.NestedMeta.html" title="enum darling::ast::NestedMeta">NestedMeta</a>]) -> <a class="enum" href="https://doc.rust-lang.org/1.76.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><Self, <a class="struct" href="../error/struct.Error.html" title="struct darling::error::Error">Error</a>></h4></section></summary><div class='docblock'>Create an instance from a list of nested meta items.</div></details><details class="toggle method-toggle" open><summary><section id="method.from_value" class="method trait-impl"><a class="src rightside" href="../../src/darling_core/from_meta.rs.html#112">source</a><a href="#method.from_value" class="anchor">§</a><h4 class="code-header">fn <a href="../trait.FromMeta.html#method.from_value" class="fn">from_value</a>(value: &<a class="enum" href="../../syn/lit/enum.Lit.html" title="enum syn::lit::Lit">Lit</a>) -> <a class="enum" href="https://doc.rust-lang.org/1.76.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><Self, <a class="struct" href="../error/struct.Error.html" title="struct darling::error::Error">Error</a>></h4></section></summary><div class='docblock'>Create an instance from a literal value of either <code>foo = "bar"</code> or <code>foo("bar")</code>.
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This dispatches to the appropriate method based on the type of literal encountered,
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and generally should not be overridden by implementers. <a href="../trait.FromMeta.html#method.from_value">Read more</a></div></details><section id="method.from_expr" class="method trait-impl"><a class="src rightside" href="../../src/darling_core/from_meta.rs.html#122">source</a><a href="#method.from_expr" class="anchor">§</a><h4 class="code-header">fn <a href="../trait.FromMeta.html#method.from_expr" class="fn">from_expr</a>(expr: &<a class="enum" href="../../syn/expr/enum.Expr.html" title="enum syn::expr::Expr">Expr</a>) -> <a class="enum" href="https://doc.rust-lang.org/1.76.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><Self, <a class="struct" href="../error/struct.Error.html" title="struct darling::error::Error">Error</a>></h4></section><details class="toggle method-toggle" open><summary><section id="method.from_char" class="method trait-impl"><a class="src rightside" href="../../src/darling_core/from_meta.rs.html#133">source</a><a href="#method.from_char" class="anchor">§</a><h4 class="code-header">fn <a href="../trait.FromMeta.html#method.from_char" class="fn">from_char</a>(value: <a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.char.html">char</a>) -> <a class="enum" href="https://doc.rust-lang.org/1.76.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><Self, <a class="struct" href="../error/struct.Error.html" title="struct darling::error::Error">Error</a>></h4></section></summary><div class='docblock'>Create an instance from a char literal in a value position.</div></details><details class="toggle method-toggle" open><summary><section id="method.from_string" class="method trait-impl"><a class="src rightside" href="../../src/darling_core/from_meta.rs.html#139">source</a><a href="#method.from_string" class="anchor">§</a><h4 class="code-header">fn <a href="../trait.FromMeta.html#method.from_string" class="fn">from_string</a>(value: &<a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.str.html">str</a>) -> <a class="enum" href="https://doc.rust-lang.org/1.76.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><Self, <a class="struct" href="../error/struct.Error.html" title="struct darling::error::Error">Error</a>></h4></section></summary><div class='docblock'>Create an instance from a string literal in a value position.</div></details><details class="toggle method-toggle" open><summary><section id="method.from_bool" class="method trait-impl"><a class="src rightside" href="../../src/darling_core/from_meta.rs.html#145">source</a><a href="#method.from_bool" class="anchor">§</a><h4 class="code-header">fn <a href="../trait.FromMeta.html#method.from_bool" class="fn">from_bool</a>(value: <a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.bool.html">bool</a>) -> <a class="enum" href="https://doc.rust-lang.org/1.76.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><Self, <a class="struct" href="../error/struct.Error.html" title="struct darling::error::Error">Error</a>></h4></section></summary><div class='docblock'>Create an instance from a bool literal in a value position.</div></details></div></details><section id="impl-Copy-for-Flag" class="impl"><a class="src rightside" href="../../src/darling_core/util/flag.rs.html#44">source</a><a href="#impl-Copy-for-Flag" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/marker/trait.Copy.html" title="trait core::marker::Copy">Copy</a> for <a class="struct" href="struct.Flag.html" title="struct darling::util::Flag">Flag</a></h3></section></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-RefUnwindSafe-for-Flag" class="impl"><a href="#impl-RefUnwindSafe-for-Flag" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/panic/unwind_safe/trait.RefUnwindSafe.html" title="trait core::panic::unwind_safe::RefUnwindSafe">RefUnwindSafe</a> for <a class="struct" href="struct.Flag.html" title="struct darling::util::Flag">Flag</a></h3></section><section id="impl-Send-for-Flag" class="impl"><a href="#impl-Send-for-Flag" class="anchor">§</a><h3 class="code-header">impl !<a class="trait" href="https://doc.rust-lang.org/1.76.0/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> for <a class="struct" href="struct.Flag.html" title="struct darling::util::Flag">Flag</a></h3></section><section id="impl-Sync-for-Flag" class="impl"><a href="#impl-Sync-for-Flag" class="anchor">§</a><h3 class="code-header">impl !<a class="trait" href="https://doc.rust-lang.org/1.76.0/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> for <a class="struct" href="struct.Flag.html" title="struct darling::util::Flag">Flag</a></h3></section><section id="impl-Unpin-for-Flag" class="impl"><a href="#impl-Unpin-for-Flag" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/marker/trait.Unpin.html" title="trait core::marker::Unpin">Unpin</a> for <a class="struct" href="struct.Flag.html" title="struct darling::util::Flag">Flag</a></h3></section><section id="impl-UnwindSafe-for-Flag" class="impl"><a href="#impl-UnwindSafe-for-Flag" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/panic/unwind_safe/trait.UnwindSafe.html" title="trait core::panic::unwind_safe::UnwindSafe">UnwindSafe</a> for <a class="struct" href="struct.Flag.html" title="struct darling::util::Flag">Flag</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/1.76.0/src/core/any.rs.html#140">source</a><a href="#impl-Any-for-T" class="anchor">§</a><h3 class="code-header">impl<T> <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/any/trait.Any.html" title="trait core::any::Any">Any</a> for T<div class="where">where
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T: 'static + ?<a class="trait" href="https://doc.rust-lang.org/1.76.0/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" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.76.0/src/core/any.rs.html#141">source</a><a href="#method.type_id" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.76.0/core/any/trait.Any.html#tymethod.type_id" class="fn">type_id</a>(&self) -> <a class="struct" href="https://doc.rust-lang.org/1.76.0/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/1.76.0/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/1.76.0/src/core/borrow.rs.html#208">source</a><a href="#impl-Borrow%3CT%3E-for-T" class="anchor">§</a><h3 class="code-header">impl<T> <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/borrow/trait.Borrow.html" title="trait core::borrow::Borrow">Borrow</a><T> for T<div class="where">where
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T: ?<a class="trait" href="https://doc.rust-lang.org/1.76.0/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/1.76.0/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/1.76.0/core/borrow/trait.Borrow.html#tymethod.borrow" class="fn">borrow</a>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.reference.html">&T</a></h4></section></summary><div class='docblock'>Immutably borrows from an owned value. <a href="https://doc.rust-lang.org/1.76.0/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/1.76.0/src/core/borrow.rs.html#216">source</a><a href="#impl-BorrowMut%3CT%3E-for-T" class="anchor">§</a><h3 class="code-header">impl<T> <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/borrow/trait.BorrowMut.html" title="trait core::borrow::BorrowMut">BorrowMut</a><T> for T<div class="where">where
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T: ?<a class="trait" href="https://doc.rust-lang.org/1.76.0/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/1.76.0/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/1.76.0/core/borrow/trait.BorrowMut.html#tymethod.borrow_mut" class="fn">borrow_mut</a>(&mut self) -> <a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.reference.html">&mut T</a></h4></section></summary><div class='docblock'>Mutably borrows from an owned value. <a href="https://doc.rust-lang.org/1.76.0/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/1.76.0/src/core/convert/mod.rs.html#763">source</a><a href="#impl-From%3CT%3E-for-T" class="anchor">§</a><h3 class="code-header">impl<T> <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/convert/trait.From.html" title="trait core::convert::From">From</a><T> for T</h3></section></summary><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="https://doc.rust-lang.org/1.76.0/src/core/convert/mod.rs.html#766">source</a><a href="#method.from-2" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.76.0/core/convert/trait.From.html#tymethod.from" class="fn">from</a>(t: T) -> T</h4></section></summary><div class="docblock"><p>Returns the argument unchanged.</p>
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</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/1.76.0/src/core/convert/mod.rs.html#747-749">source</a><a href="#impl-Into%3CU%3E-for-T" class="anchor">§</a><h3 class="code-header">impl<T, U> <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a><U> for T<div class="where">where
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U: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/convert/trait.From.html" title="trait core::convert::From">From</a><T>,</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/1.76.0/src/core/convert/mod.rs.html#756">source</a><a href="#method.into" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.76.0/core/convert/trait.Into.html#tymethod.into" class="fn">into</a>(self) -> U</h4></section></summary><div class="docblock"><p>Calls <code>U::from(self)</code>.</p>
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<p>That is, this conversion is whatever the implementation of
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<code><a href="https://doc.rust-lang.org/1.76.0/core/convert/trait.From.html" title="trait core::convert::From">From</a><T> for U</code> chooses to do.</p>
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</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/1.76.0/src/alloc/borrow.rs.html#83-85">source</a><a href="#impl-ToOwned-for-T" class="anchor">§</a><h3 class="code-header">impl<T> <a class="trait" href="https://doc.rust-lang.org/1.76.0/alloc/borrow/trait.ToOwned.html" title="trait alloc::borrow::ToOwned">ToOwned</a> for T<div class="where">where
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T: <a class="trait" href="https://doc.rust-lang.org/1.76.0/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/1.76.0/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/1.76.0/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/1.76.0/alloc/borrow/trait.ToOwned.html#tymethod.to_owned" class="fn">to_owned</a>(&self) -> T</h4></section></summary><div class='docblock'>Creates owned data from borrowed data, usually by cloning. <a href="https://doc.rust-lang.org/1.76.0/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/1.76.0/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/1.76.0/alloc/borrow/trait.ToOwned.html#method.clone_into" class="fn">clone_into</a>(&self, target: <a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.reference.html">&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/1.76.0/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/1.76.0/src/core/convert/mod.rs.html#803-805">source</a><a href="#impl-TryFrom%3CU%3E-for-T" class="anchor">§</a><h3 class="code-header">impl<T, U> <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><U> for T<div class="where">where
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U: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a><T>,</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/1.76.0/core/convert/trait.TryFrom.html#associatedtype.Error" class="associatedtype">Error</a> = <a class="enum" href="https://doc.rust-lang.org/1.76.0/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/1.76.0/src/core/convert/mod.rs.html#810">source</a><a href="#method.try_from" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.76.0/core/convert/trait.TryFrom.html#tymethod.try_from" class="fn">try_from</a>(value: U) -> <a class="enum" href="https://doc.rust-lang.org/1.76.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, <T as <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><U>>::<a class="associatedtype" href="https://doc.rust-lang.org/1.76.0/core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a>></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/1.76.0/src/core/convert/mod.rs.html#788-790">source</a><a href="#impl-TryInto%3CU%3E-for-T" class="anchor">§</a><h3 class="code-header">impl<T, U> <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/convert/trait.TryInto.html" title="trait core::convert::TryInto">TryInto</a><U> for T<div class="where">where
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U: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><T>,</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/1.76.0/core/convert/trait.TryInto.html#associatedtype.Error" class="associatedtype">Error</a> = <U as <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><T>>::<a class="associatedtype" href="https://doc.rust-lang.org/1.76.0/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/1.76.0/src/core/convert/mod.rs.html#795">source</a><a href="#method.try_into" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.76.0/core/convert/trait.TryInto.html#tymethod.try_into" class="fn">try_into</a>(self) -> <a class="enum" href="https://doc.rust-lang.org/1.76.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><U, <U as <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><T>>::<a class="associatedtype" href="https://doc.rust-lang.org/1.76.0/core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a>></h4></section></summary><div class='docblock'>Performs the conversion.</div></details></div></details></div></section></div></main></body></html> |