<!DOCTYPE html><htmllang="en"><head><metacharset="utf-8"><metaname="viewport"content="width=device-width, initial-scale=1.0"><metaname="generator"content="rustdoc"><metaname="description"content="API documentation for the Rust `VacantEntry` struct in crate `actix_web`."><metaname="keywords"content="rust, rustlang, rust-lang, VacantEntry"><title>actix_web::http::header::VacantEntry - Rust</title><linkrel="stylesheet"type="text/css"href="../../../normalize.css"><linkrel="stylesheet"type="text/css"href="../../../rustdoc.css"id="mainThemeStyle"><linkrel="stylesheet"type="text/css"href="../../../dark.css"><linkrel="stylesheet"type="text/css"href="../../../light.css"id="themeStyle"><scriptsrc="../../../storage.js"></script></head><bodyclass="rustdoc struct"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><navclass="sidebar"><divclass="sidebar-menu">☰</div><pclass='location'>Struct VacantEntry</p><divclass="sidebar-elems"><divclass="block items"><aclass="sidebar-title"href="#methods">Methods</a><divclass="sidebar-links"><ahref="#method.key">key</a><ahref="#method.into_key">into_key</a><ahref="#method.insert">insert</a><ahref="#method.insert_entry">insert_entry</a></div><aclass="sidebar-title"href="#implementations">Trait Implementations</a><divclass="sidebar-links"><ahref="#impl-Debug">Debug</a></div><aclass="sidebar-title"href="#synthetic-implementations">Auto Trait Implementations</a><divclass="sidebar-links"><ahref="#impl-Send">Send</a><ahref="#impl-Sync">Sync</a></div></div><pclass='location'><ahref='../../index.html'>actix_web</a>::<wbr><ahref='../index.html'>http</a>::<wbr><ahref='index.html'>header</a></p><script>window.sidebarCurrent={name:'VacantEntry',ty:'struct',relpath:''};</script><scriptdefersrc="sidebar-items.js"></script></div></nav><divclass="theme-picker"><buttonid="theme-picker"aria-label="Pick another theme!"><imgsrc="../../../brush.svg"width="18"alt="Pick another theme!"></button><divid="theme-choices"></div></div><scriptsrc="../../../theme.js"></script><navclass="sub"><formclass="search-form js-only"><divclass="search-container"><inputclass="search-input"name="search"autocomplete="off"placeholder="Click or press ‘S’ to search, ‘?’ for more options…"type="search"><aid="settings-menu"href="../../../settings.html"><imgsrc="../../../wheel.svg"width="18"alt="Change settings"></a></div></form></nav><sectionid="main"class="content"><h1class='fqn'><spanclass='in-band'>Struct <ahref='../../index.html'>actix_web</a>::<wbr><ahref='../index.html'>http</a>::<wbr><ahref='index.html'>header</a>::<wbr><aclass="struct"href=''>VacantEntry</a></span><spanclass='out-of-band'><spanid='render-detail'><aid="toggle-all-docs"href="javascript:void(0)"title="collapse all docs">[<spanclass='inner'>−</span>]</a></span><aclass='srclink'href='https://docs.rs/http/0.1.8/src/http/header/map.rs.html#159-165'title='goto source code'>[src]</a></span></h1><divclass="docblock type-decl"><preclass='rust struct'>pub struct VacantEntry<'a, T><spanclass="where fmt-newline">where<br> T: 'a, </span> { /* fields omitted */ }</pre></div><divclass='docblock'><p>A view into a single empty location in a <code>HeaderMap</code>.</p>
</div><h4id='method.insert_entry'class="method"><spanid='insert_entry.v'class='invisible'><tableclass='table-display'><tbody><tr><td><code>pub fn <ahref='#method.insert_entry'class='fnname'>insert_entry</a>(self, value: T) -><aclass="struct"href="../../../actix_web/http/header/struct.OccupiedEntry.html"title="struct actix_web::http::header::OccupiedEntry">OccupiedEntry</a><'a, T></code></span></td><td><spanclass='out-of-band'><divclass='ghost'></div><aclass='srclink'href='https://docs.rs/http/0.1.8/src/http/header/map.rs.html#2288-2302'title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><divclass='docblock'><p>Insert the value into the entry.</p>
<divid='implementations-list'><h3id='impl-Debug'class='impl'><spanclass='in-band'><tableclass='table-display'><tbody><tr><td><code>impl<'a, T><aclass="trait"href="https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html"title="trait core::fmt::Debug">Debug</a> for <aclass="struct"href="../../../actix_web/http/header/struct.VacantEntry.html"title="struct actix_web::http::header::VacantEntry">VacantEntry</a><'a, T><spanclass="where fmt-newline">where<br> T: 'a + <aclass="trait"href="https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html"title="trait core::fmt::Debug">Debug</a>, </span></code><ahref='#impl-Debug'class='anchor'></a></span></td><td><spanclass='out-of-band'><divclass='ghost'></div><aclass='srclink'href='https://docs.rs/http/0.1.8/src/http/header/map.rs.html#158'title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><divclass='impl-items'><h4id='method.fmt'class="method"><spanid='fmt.v'class='invisible'><tableclass='table-display'><tbody><tr><td><code>fn <ahref='https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html#tymethod.fmt'class='fnname'>fmt</a>(&self, f: &mut <aclass="struct"href="https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html"title="struct core::fmt::Formatter">Formatter</a>) -><aclass="enum"href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html"title="enum core::result::Result">Result</a><<aclass="primitive"href="https://doc.rust-lang.org/nightly/std/primitive.unit.html">()</a>, <aclass="struct"href="https://doc.rust-lang.org/nightly/core/fmt/struct.Error.html"title="struct core::fmt::Error">Error</a>></code></span></td><td><spanclass='out-of-band'><divclass='ghost'></div><aclass='srclink'href='https://docs.rs/http/0.1.8/src/http/header/map.rs.html#158'title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><divclass='docblock'><p>Formats the value using the given formatter. <ahref="https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html#tymethod.fmt">Read more</a></p>
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<h3id='impl-Send'class='impl'><spanclass='in-band'><tableclass='table-display'><tbody><tr><td><code>impl<'a, T><aclass="trait"href="https://doc.rust-lang.org/nightly/core/marker/trait.Send.html"title="trait core::marker::Send">Send</a> for <aclass="struct"href="../../../actix_web/http/header/struct.VacantEntry.html"title="struct actix_web::http::header::VacantEntry">VacantEntry</a><'a, T><spanclass="where fmt-newline">where<br> T: <aclass="trait"href="https://doc.rust-lang.org/nightly/core/marker/trait.Send.html"title="trait core::marker::Send">Send</a>, </span></code><ahref='#impl-Send'class='anchor'></a></span></td><td><spanclass='out-of-band'></span></td></tr></tbody></table></h3><divclass='impl-items'></div><h3id='impl-Sync'class='impl'><spanclass='in-band'><tableclass='table-display'><tbody><tr><td><code>impl<'a, T><aclass="trait"href="https://doc.rust-lang.org/nightly/core/marker/trait.Sync.html"title="trait core::marker::Sync">Sync</a> for <aclass="struct"href="../../../actix_web/http/header/struct.VacantEntry.html"title="struct actix_web::http::header::VacantEntry">VacantEntry</a><'a, T><spanclass="where fmt-newline">where<br> T: <aclass="trait"href="https://doc.rust-lang.org/nightly/core/marker/trait.Sync.html"title="trait core::marker::Sync">Sync</a>, </span></code><ahref='#impl-Sync'class='anchor'></a></span></td><td><spanclass='out-of-band'></span></td></tr></tbody></table></h3><divclass='impl-items'></div></div></section><sectionid="search"class="content hidden"></section><sectionclass="footer"></section><asideid="help"class="hidden"><div><h1class="hidden">Help</h1><divclass="shortcuts"><h2>Keyboard Shortcuts</h2><dl><dt><kbd>?</kbd></dt><dd>Show this help dialog</dd><dt><kbd>S</kbd></dt><dd>Focus the search field</dd><dt><kbd>↑</kbd></dt><dd>Move up in search results</dd><dt><kbd>↓</kbd></dt><dd>Move down in search results</dd><dt><kbd>↹</kbd></dt><dd>Switch tab</dd><dt><kbd>⏎</kbd></dt><dd>Go to active search result</dd><dt><kbd>+</kbd></dt><dd>Expand all sections</dd><dt><kbd>-</kbd></dt><dd>Collapse all sections</dd></dl></div><divclass="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><p>Search multiple things at once by splitting your query with comma (e.g. <code>str,u8</code> or <code>String,struct:Vec,test</code>)</p></div></div></aside><script>window.rootPath="../../../";window.currentCrate="actix_web";</script><scriptsrc="../../../aliases.js"></script><scriptsrc="../../../main.js"></script><scriptdefersrc="../../../search-index.js"></script></body></html>
