| <!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="Deferred value initialization."><meta name="keywords" content="rust, rustlang, rust-lang, fill"><title>value_bag::fill - Rust</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../normalize.css"><link rel="stylesheet" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../ayu.css" disabled><link rel="stylesheet" href="../../dark.css" disabled><link rel="stylesheet" href="../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../storage.js"></script><script defer src="../../main.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../favicon.svg"></head><body class="rustdoc mod"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle">☰</button><a class="sidebar-logo" href="../../value_bag/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a><h2></h2></nav><nav class="sidebar"><a class="sidebar-logo" href="../../value_bag/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a><h2 class="location"><a href="#">Module fill</a></h2><div class="sidebar-elems"><section><ul class="block"><li><a href="#structs">Structs</a></li><li><a href="#traits">Traits</a></li></ul></section></div></nav><main><div class="width-limiter"><nav class="sub"><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="main-heading"><h1 class="fqn">Module <a href="../index.html">value_bag</a>::<wbr><a class="mod" href="#">fill</a><button id="copy-path" onclick="copy_path(this)" title="Copy item path to clipboard"><img src="../../clipboard.svg" width="19" height="18" alt="Copy item path"></button></h1><span class="out-of-band"><a class="srclink" href="../../src/value_bag/fill.rs.html#1-197">source</a> · <a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">−</span>]</a></span></div><details class="rustdoc-toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Deferred value initialization.</p> |
| <p>The <a href="trait.Fill.html" title="Fill"><code>Fill</code></a> trait is a way to bridge APIs that may not be directly |
| compatible with other constructor methods.</p> |
| <p>The <code>Fill</code> trait is automatically implemented for closures, so can usually |
| be used in libraries that can’t implement the trait themselves.</p> |
| |
| <div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>value_bag::{ValueBag, fill::Slot}; |
| |
| <span class="kw">let </span>value = ValueBag::from_fill(<span class="kw-2">&</span>|slot: Slot| { |
| <span class="attribute">#[derive(Debug)] |
| </span><span class="kw">struct </span>MyShortLivedValue; |
| |
| slot.fill_debug(<span class="kw-2">&</span>MyShortLivedValue) |
| }); |
| |
| <span class="macro">assert_eq!</span>(<span class="string">"MyShortLivedValue"</span>, <span class="macro">format!</span>(<span class="string">"{:?}"</span>, value));</code></pre></div> |
| <p>The trait can also be implemented manually:</p> |
| |
| <div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>value_bag::{ValueBag, Error, fill::{Slot, Fill}}; |
| |
| <span class="kw">struct </span>FillDebug; |
| |
| <span class="kw">impl </span>Fill <span class="kw">for </span>FillDebug { |
| <span class="kw">fn </span>fill(<span class="kw-2">&</span><span class="self">self</span>, slot: Slot) -> <span class="prelude-ty">Result</span><(), Error> { |
| slot.fill_debug(<span class="kw-2">&</span><span class="number">42i64 </span><span class="kw">as </span><span class="kw-2">&</span><span class="kw">dyn </span>Debug) |
| } |
| } |
| |
| <span class="kw">let </span>value = ValueBag::from_fill(<span class="kw-2">&</span>FillDebug); |
| |
| <span class="macro">assert_eq!</span>(<span class="prelude-val">None</span>, value.to_i64());</code></pre></div> |
| </div></details><h2 id="structs" class="small-section-header"><a href="#structs">Structs</a></h2><div class="item-table"><div class="item-row"><div class="item-left module-item"><a class="struct" href="struct.Slot.html" title="value_bag::fill::Slot struct">Slot</a></div><div class="item-right docblock-short">A value slot to fill using the <a href="trait.Fill.html"><code>Fill</code></a> trait.</div></div></div><h2 id="traits" class="small-section-header"><a href="#traits">Traits</a></h2><div class="item-table"><div class="item-row"><div class="item-left module-item"><a class="trait" href="trait.Fill.html" title="value_bag::fill::Fill trait">Fill</a></div><div class="item-right docblock-short">A type that requires extra work to convert into a <a href="../struct.ValueBag.html"><code>ValueBag</code></a>.</div></div></div></section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="value_bag" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
