<!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="API documentation for the Rust `FromValueOptional` trait in crate `glib`.">
<meta name="keywords" content="rust, rustlang, rust-lang, FromValueOptional">
<title>glib::value::FromValueOptional - Rust</title>
<link rel="stylesheet" type="text/css" href="../../normalize.css">
<link rel="stylesheet" type="text/css" href="../../rustdoc.css">
<link rel="stylesheet" type="text/css" href="../../main.css">
</head>
<body class="rustdoc trait">
<!--[if lte IE 8]>
<div class="warning">
This old browser is unsupported and will most likely display funky
things.
</div>
<![endif]-->
<nav class="sidebar">
<p class='location'>Trait FromValueOptional</p><div class="block items"><a class="sidebar-title" href="#required-methods">Required Methods</a><div class="sidebar-links"><a href="#tymethod.from_value_optional">from_value_optional</a></div><a class="sidebar-title" href="#foreign-impls">Implementations on Foreign Types</a><div class="sidebar-links"><a href="#impl-FromValueOptional%3C%27a%3E">String</a><a href="#impl-FromValueOptional%3C%27a%3E">&'a str</a><a href="#impl-FromValueOptional%3C%27a%3E">bool</a><a href="#impl-FromValueOptional%3C%27a%3E">i8</a><a href="#impl-FromValueOptional%3C%27a%3E">u8</a><a href="#impl-FromValueOptional%3C%27a%3E">i32</a><a href="#impl-FromValueOptional%3C%27a%3E">u32</a><a href="#impl-FromValueOptional%3C%27a%3E">i64</a><a href="#impl-FromValueOptional%3C%27a%3E">u64</a><a href="#impl-FromValueOptional%3C%27a%3E">f32</a><a href="#impl-FromValueOptional%3C%27a%3E">f64</a></div><a class="sidebar-title" href="#implementors">Implementors</a></div><p class='location'><a href='../index.html'>glib</a>::<wbr><a href='index.html'>value</a></p><script>window.sidebarCurrent = {name: 'FromValueOptional', ty: 'trait', relpath: ''};</script><script defer src="sidebar-items.js"></script>
</nav>
<nav class="sub">
<form class="search-form js-only">
<div class="search-container">
<input class="search-input" name="search"
autocomplete="off"
placeholder="Click or press ‘S’ to search, ‘?’ for more options…"
type="search">
</div>
</form>
</nav>
<section id='main' class="content">
<h1 class='fqn'><span class='in-band'>Trait <a href='../index.html'>glib</a>::<wbr><a href='index.html'>value</a>::<wbr><a class="trait" href=''>FromValueOptional</a></span><span class='out-of-band'><span id='render-detail'>
<a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">
[<span class='inner'>−</span>]
</a>
</span><a class='srclink' href='../../src/glib/value.rs.html#575-577' title='goto source code'>[src]</a></span></h1>
<pre class='rust trait'>pub trait FromValueOptional<'a>: <a class="trait" href="../../glib/types/trait.StaticType.html" title="trait glib::types::StaticType">StaticType</a> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a> {
unsafe fn <a href='#tymethod.from_value_optional' class='fnname'>from_value_optional</a>(_: &'a <a class="struct" href="../../glib/value/struct.Value.html" title="struct glib::value::Value">Value</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self>;
}</pre><div class='docblock'><p>Extracts a value.</p>
<p>Types that don't support a <code>None</code> value always return <code>Some</code>.</p>
</div>
<h2 id='required-methods' class='small-section-header'>
Required Methods<a href='#required-methods' class='anchor'></a>
</h2>
<div class='methods'>
<h3 id='tymethod.from_value_optional' class='method'><span id='from_value_optional.v' class='invisible'><code>unsafe fn <a href='#tymethod.from_value_optional' class='fnname'>from_value_optional</a>(_: &'a <a class="struct" href="../../glib/value/struct.Value.html" title="struct glib::value::Value">Value</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self></code></span></h3></div>
<h2 id='foreign-impls' class='small-section-header'>
Implementations on Foreign Types<a href='#foreign-impls' class='anchor'></a>
</h2>
<h3 id='impl-FromValueOptional%3C%27a%3E' class='impl'><span class='in-band'><code>impl<'a> <a class="trait" href="../../glib/value/trait.FromValueOptional.html" title="trait glib::value::FromValueOptional">FromValueOptional</a><'a> for <a class="struct" href="https://doc.rust-lang.org/nightly/alloc/string/struct.String.html" title="struct alloc::string::String">String</a></code><a href='#impl-FromValueOptional%3C%27a%3E' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/glib/value.rs.html#598-602' title='goto source code'>[src]</a></span></h3>
<span class='docblock autohide'><div class='impl-items'><h4 id='method.from_value_optional' class="method"><span id='from_value_optional.v-1' class='invisible'><code>unsafe fn <a href='#method.from_value_optional' class='fnname'>from_value_optional</a>(value: &'a <a class="struct" href="../../glib/value/struct.Value.html" title="struct glib::value::Value">Value</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/glib/value.rs.html#599-601' title='goto source code'>[src]</a></span></h4>
</div></span><h3 id='impl-FromValueOptional%3C%27a%3E-1' class='impl'><span class='in-band'><code>impl<'a> <a class="trait" href="../../glib/value/trait.FromValueOptional.html" title="trait glib::value::FromValueOptional">FromValueOptional</a><'a> for &'a <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a></code><a href='#impl-FromValueOptional%3C%27a%3E-1' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/glib/value.rs.html#604-613' title='goto source code'>[src]</a></span></h3>
<span class='docblock autohide'><div class='impl-items'><h4 id='method.from_value_optional-1' class="method"><span id='from_value_optional.v-2' class='invisible'><code>unsafe fn <a href='#method.from_value_optional' class='fnname'>from_value_optional</a>(value: &'a <a class="struct" href="../../glib/value/struct.Value.html" title="struct glib::value::Value">Value</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/glib/value.rs.html#605-612' title='goto source code'>[src]</a></span></h4>
</div></span><h3 id='impl-FromValueOptional%3C%27a%3E-2' class='impl'><span class='in-band'><code>impl<'a> <a class="trait" href="../../glib/value/trait.FromValueOptional.html" title="trait glib::value::FromValueOptional">FromValueOptional</a><'a> for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a></code><a href='#impl-FromValueOptional%3C%27a%3E-2' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/glib/value.rs.html#651-655' title='goto source code'>[src]</a></span></h3>
<span class='docblock autohide'><div class='impl-items'><h4 id='method.from_value_optional-2' class="method"><span id='from_value_optional.v-3' class='invisible'><code>unsafe fn <a href='#method.from_value_optional' class='fnname'>from_value_optional</a>(value: &'a <a class="struct" href="../../glib/value/struct.Value.html" title="struct glib::value::Value">Value</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/glib/value.rs.html#652-654' title='goto source code'>[src]</a></span></h4>
</div></span><h3 id='impl-FromValueOptional%3C%27a%3E-3' class='impl'><span class='in-band'><code>impl<'a> <a class="trait" href="../../glib/value/trait.FromValueOptional.html" title="trait glib::value::FromValueOptional">FromValueOptional</a><'a> for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.i8.html">i8</a></code><a href='#impl-FromValueOptional%3C%27a%3E-3' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/glib/value.rs.html#671-675' title='goto source code'>[src]</a></span></h3>
<span class='docblock autohide'><div class='impl-items'><h4 id='method.from_value_optional-3' class="method"><span id='from_value_optional.v-4' class='invisible'><code>unsafe fn <a href='#method.from_value_optional' class='fnname'>from_value_optional</a>(value: &'a <a class="struct" href="../../glib/value/struct.Value.html" title="struct glib::value::Value">Value</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/glib/value.rs.html#672-674' title='goto source code'>[src]</a></span></h4>
</div></span><h3 id='impl-FromValueOptional%3C%27a%3E-4' class='impl'><span class='in-band'><code>impl<'a> <a class="trait" href="../../glib/value/trait.FromValueOptional.html" title="trait glib::value::FromValueOptional">FromValueOptional</a><'a> for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a></code><a href='#impl-FromValueOptional%3C%27a%3E-4' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/glib/value.rs.html#671-675' title='goto source code'>[src]</a></span></h3>
<span class='docblock autohide'><div class='impl-items'><h4 id='method.from_value_optional-4' class="method"><span id='from_value_optional.v-5' class='invisible'><code>unsafe fn <a href='#method.from_value_optional' class='fnname'>from_value_optional</a>(value: &'a <a class="struct" href="../../glib/value/struct.Value.html" title="struct glib::value::Value">Value</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/glib/value.rs.html#672-674' title='goto source code'>[src]</a></span></h4>
</div></span><h3 id='impl-FromValueOptional%3C%27a%3E-5' class='impl'><span class='in-band'><code>impl<'a> <a class="trait" href="../../glib/value/trait.FromValueOptional.html" title="trait glib::value::FromValueOptional">FromValueOptional</a><'a> for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.i32.html">i32</a></code><a href='#impl-FromValueOptional%3C%27a%3E-5' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/glib/value.rs.html#671-675' title='goto source code'>[src]</a></span></h3>
<span class='docblock autohide'><div class='impl-items'><h4 id='method.from_value_optional-5' class="method"><span id='from_value_optional.v-6' class='invisible'><code>unsafe fn <a href='#method.from_value_optional' class='fnname'>from_value_optional</a>(value: &'a <a class="struct" href="../../glib/value/struct.Value.html" title="struct glib::value::Value">Value</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/glib/value.rs.html#672-674' title='goto source code'>[src]</a></span></h4>
</div></span><h3 id='impl-FromValueOptional%3C%27a%3E-6' class='impl'><span class='in-band'><code>impl<'a> <a class="trait" href="../../glib/value/trait.FromValueOptional.html" title="trait glib::value::FromValueOptional">FromValueOptional</a><'a> for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u32.html">u32</a></code><a href='#impl-FromValueOptional%3C%27a%3E-6' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/glib/value.rs.html#671-675' title='goto source code'>[src]</a></span></h3>
<span class='docblock autohide'><div class='impl-items'><h4 id='method.from_value_optional-6' class="method"><span id='from_value_optional.v-7' class='invisible'><code>unsafe fn <a href='#method.from_value_optional' class='fnname'>from_value_optional</a>(value: &'a <a class="struct" href="../../glib/value/struct.Value.html" title="struct glib::value::Value">Value</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/glib/value.rs.html#672-674' title='goto source code'>[src]</a></span></h4>
</div></span><h3 id='impl-FromValueOptional%3C%27a%3E-7' class='impl'><span class='in-band'><code>impl<'a> <a class="trait" href="../../glib/value/trait.FromValueOptional.html" title="trait glib::value::FromValueOptional">FromValueOptional</a><'a> for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.i64.html">i64</a></code><a href='#impl-FromValueOptional%3C%27a%3E-7' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/glib/value.rs.html#671-675' title='goto source code'>[src]</a></span></h3>
<span class='docblock autohide'><div class='impl-items'><h4 id='method.from_value_optional-7' class="method"><span id='from_value_optional.v-8' class='invisible'><code>unsafe fn <a href='#method.from_value_optional' class='fnname'>from_value_optional</a>(value: &'a <a class="struct" href="../../glib/value/struct.Value.html" title="struct glib::value::Value">Value</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/glib/value.rs.html#672-674' title='goto source code'>[src]</a></span></h4>
</div></span><h3 id='impl-FromValueOptional%3C%27a%3E-8' class='impl'><span class='in-band'><code>impl<'a> <a class="trait" href="../../glib/value/trait.FromValueOptional.html" title="trait glib::value::FromValueOptional">FromValueOptional</a><'a> for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u64.html">u64</a></code><a href='#impl-FromValueOptional%3C%27a%3E-8' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/glib/value.rs.html#671-675' title='goto source code'>[src]</a></span></h3>
<span class='docblock autohide'><div class='impl-items'><h4 id='method.from_value_optional-8' class="method"><span id='from_value_optional.v-9' class='invisible'><code>unsafe fn <a href='#method.from_value_optional' class='fnname'>from_value_optional</a>(value: &'a <a class="struct" href="../../glib/value/struct.Value.html" title="struct glib::value::Value">Value</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/glib/value.rs.html#672-674' title='goto source code'>[src]</a></span></h4>
</div></span><h3 id='impl-FromValueOptional%3C%27a%3E-9' class='impl'><span class='in-band'><code>impl<'a> <a class="trait" href="../../glib/value/trait.FromValueOptional.html" title="trait glib::value::FromValueOptional">FromValueOptional</a><'a> for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.f32.html">f32</a></code><a href='#impl-FromValueOptional%3C%27a%3E-9' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/glib/value.rs.html#671-675' title='goto source code'>[src]</a></span></h3>
<span class='docblock autohide'><div class='impl-items'><h4 id='method.from_value_optional-9' class="method"><span id='from_value_optional.v-10' class='invisible'><code>unsafe fn <a href='#method.from_value_optional' class='fnname'>from_value_optional</a>(value: &'a <a class="struct" href="../../glib/value/struct.Value.html" title="struct glib::value::Value">Value</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/glib/value.rs.html#672-674' title='goto source code'>[src]</a></span></h4>
</div></span><h3 id='impl-FromValueOptional%3C%27a%3E-10' class='impl'><span class='in-band'><code>impl<'a> <a class="trait" href="../../glib/value/trait.FromValueOptional.html" title="trait glib::value::FromValueOptional">FromValueOptional</a><'a> for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.f64.html">f64</a></code><a href='#impl-FromValueOptional%3C%27a%3E-10' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/glib/value.rs.html#671-675' title='goto source code'>[src]</a></span></h3>
<span class='docblock autohide'><div class='impl-items'><h4 id='method.from_value_optional-10' class="method"><span id='from_value_optional.v-11' class='invisible'><code>unsafe fn <a href='#method.from_value_optional' class='fnname'>from_value_optional</a>(value: &'a <a class="struct" href="../../glib/value/struct.Value.html" title="struct glib::value::Value">Value</a>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/glib/value.rs.html#672-674' title='goto source code'>[src]</a></span></h4>
</div></span>
<h2 id='implementors' class='small-section-header'>
Implementors<a href='#implementors' class='anchor'></a>
</h2>
<ul class='item-list' id='implementors-list'>
</ul><script type="text/javascript" async
src="../../implementors/glib/value/trait.FromValueOptional.js">
</script></section>
<section id='search' class="content hidden"></section>
<section class="footer"></section>
<aside id="help" class="hidden">
<div>
<h1 class="hidden">Help</h1>
<div class="shortcuts">
<h2>Keyboard Shortcuts</h2>
<dl>
<dt>?</dt>
<dd>Show this help dialog</dd>
<dt>S</dt>
<dd>Focus the search field</dd>
<dt>↑</dt>
<dd>Move up in search results</dd>
<dt>↓</dt>
<dd>Move down in search results</dd>
<dt>↹</dt>
<dd>Switch tab</dd>
<dt>⏎</dt>
<dd>Go to active search result</dd>
<dt style="width:31px;">+ / -</dt>
<dd>Collapse/expand all sections</dd>
</dl>
</div>
<div class="infos">
<h2>Search Tricks</h2>
<p>
Prefix searches with a type followed by a colon (e.g.
<code>fn:</code>) to restrict the search to a given type.
</p>
<p>
Accepted types are: <code>fn</code>, <code>mod</code>,
<code>struct</code>, <code>enum</code>,
<code>trait</code>, <code>type</code>, <code>macro</code>,
and <code>const</code>.
</p>
<p>
Search functions by type signature (e.g.
<code>vec -> usize</code> or <code>* -> vec</code>)
</p>
</div>
</div>
</aside>
<script>
window.rootPath = "../../";
window.currentCrate = "glib";
</script>
<script src="../../main.js"></script>
<script defer src="../../search-index.js"></script>
</body>
</html>