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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="API documentation for the Rust `UnsafeFutureObj` trait in crate `futures_task`."><meta name="keywords" content="rust, rustlang, rust-lang, UnsafeFutureObj"><title>futures_task::UnsafeFutureObj - Rust</title><link rel="stylesheet" type="text/css" href="../normalize.css"><link rel="stylesheet" type="text/css" href="../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../light.css" id="themeStyle"><link rel="stylesheet" type="text/css" href="../dark.css" disabled ><link rel="stylesheet" type="text/css" href="../ayu.css" disabled ><script id="default-settings"></script><script src="../storage.js"></script><noscript><link rel="stylesheet" href="../noscript.css"></noscript><link rel="icon" type="image/svg+xml" href="../favicon.svg">
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<link rel="alternate icon" type="image/png" href="../favicon-32x32.png"><style type="text/css">#crate-search{background-image:url("../down-arrow.svg");}</style></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"><div class="sidebar-menu">☰</div><a href='../futures_task/index.html'><div class='logo-container rust-logo'><img src='../rust-logo.png' alt='logo'></div></a><p class="location">Trait UnsafeFutureObj</p><div class="sidebar-elems"><div class="block items"><a class="sidebar-title" href="#required-methods">Required Methods</a><div class="sidebar-links"><a href="#tymethod.drop">drop</a><a href="#tymethod.into_raw">into_raw</a></div><a class="sidebar-title" href="#foreign-impls">Implementations on Foreign Types</a><div class="sidebar-links"><a href="#impl-UnsafeFutureObj%3C%27a%2C%20T%3E-for-%26%27a%20mut%20(dyn%20Future%3COutput%20=%20T%3E%20+%20Unpin%20+%20%27a)">&'a mut (dyn Future<Output = T> + Unpin + 'a)</a><a href="#impl-UnsafeFutureObj%3C%27a%2C%20T%3E-for-Pin%3C%26%27a%20mut%20(dyn%20Future%3COutput%20=%20T%3E%20+%20%27a)%3E">Pin<&'a mut (dyn Future<Output = T> + 'a)></a><a href="#impl-UnsafeFutureObj%3C%27a%2C%20T%3E-for-Pin%3C%26%27a%20mut%20F%3E">Pin<&'a mut F></a></div><a class="sidebar-title" href="#implementors">Implementors</a></div><p class="location"><a href="index.html">futures_task</a></p><script>window.sidebarCurrent = {name: "UnsafeFutureObj", ty: "trait", relpath: ""};</script><script defer src="sidebar-items.js"></script></div></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!" aria-haspopup="menu"><img src="../brush.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices" role="menu"></div></div><script src="../theme.js"></script><nav class="sub"><form class="search-form"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" disabled autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><button type="button" class="help-button">?</button>
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<a id="settings-menu" href="../settings.html"><img src="../wheel.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><h1 class="fqn"><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/futures_task/future_obj.rs.html#147-179" title="goto source code">[src]</a></span><span class="in-band">Trait <a href="index.html">futures_task</a>::<wbr><a class="trait" href="">UnsafeFutureObj</a></span></h1><div class="docblock type-decl hidden-by-usual-hider"><pre class="rust trait">pub unsafe trait UnsafeFutureObj<'a, T>: 'a {
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fn <a href="#tymethod.into_raw" class="fnname">into_raw</a>(self) -> *mut dyn <a class="trait" href="https://doc.rust-lang.org/nightly/core/future/future/trait.Future.html" title="trait core::future::future::Future">Future</a><Output = T> + 'a;
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<div class="item-spacer"></div> unsafe fn <a href="#tymethod.drop" class="fnname">drop</a>(ptr: *mut dyn <a class="trait" href="https://doc.rust-lang.org/nightly/core/future/future/trait.Future.html" title="trait core::future::future::Future">Future</a><Output = T> + 'a);
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}</pre></div><div class="docblock"><p>A custom implementation of a future trait object for <code>FutureObj</code>, providing
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a vtable with drop support.</p>
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<p>This custom representation is typically used only in <code>no_std</code> contexts,
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where the default <code>Box</code>-based implementation is not available.</p>
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<h1 id="safety" class="section-header"><a href="#safety">Safety</a></h1>
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<p>See the safety notes on individual methods for what guarantees an
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implementor must provide.</p>
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</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.into_raw" class="method"><code>fn <a href="#tymethod.into_raw" class="fnname">into_raw</a>(self) -> *mut dyn <a class="trait" href="https://doc.rust-lang.org/nightly/core/future/future/trait.Future.html" title="trait core::future::future::Future">Future</a><Output = T> + 'a</code><a class="srclink" href="../src/futures_task/future_obj.rs.html#158" title="goto source code">[src]</a></h3><div class="docblock"><p>Convert an owned instance into a (conceptually owned) fat pointer.</p>
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<h1 id="safety-1" class="section-header"><a href="#safety-1">Safety</a></h1><h2 id="implementor" class="section-header"><a href="#implementor">Implementor</a></h2>
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<p>The trait implementor must guarantee that it is safe to convert the
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provided <code>*mut (dyn Future<Output = T> + 'a)</code> into a <code>Pin<&mut (dyn Future<Output = T> + 'a)></code> and call methods on it, non-reentrantly,
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until <code>UnsafeFutureObj::drop</code> is called with it.</p>
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</div><h3 id="tymethod.drop" class="method"><code>unsafe fn <a href="#tymethod.drop" class="fnname">drop</a>(ptr: *mut dyn <a class="trait" href="https://doc.rust-lang.org/nightly/core/future/future/trait.Future.html" title="trait core::future::future::Future">Future</a><Output = T> + 'a)</code><a class="srclink" href="../src/futures_task/future_obj.rs.html#178" title="goto source code">[src]</a></h3><div class="docblock"><p>Drops the future represented by the given fat pointer.</p>
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<h1 id="safety-2" class="section-header"><a href="#safety-2">Safety</a></h1><h2 id="implementor-1" class="section-header"><a href="#implementor-1">Implementor</a></h2>
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<p>The trait implementor must guarantee that it is safe to call this
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function once per <code>into_raw</code> invocation.</p>
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<h2 id="caller" class="section-header"><a href="#caller">Caller</a></h2>
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<p>The caller must ensure:</p>
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<ul>
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<li>the pointer passed was obtained from an <code>into_raw</code> invocation from
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this same trait object</li>
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<li>the pointer is not currently in use as a <code>Pin<&mut (dyn Future<Output = T> + 'a)></code></li>
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<li>the pointer must not be used again after this function is called</li>
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</ul>
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</div></div><span class="loading-content">Loading content...</span><h2 id="foreign-impls" class="small-section-header">Implementations on Foreign Types<a href="#foreign-impls" class="anchor"></a></h2><h3 id="impl-UnsafeFutureObj%3C%27a%2C%20T%3E-for-%26%27a%20mut%20(dyn%20Future%3COutput%20=%20T%3E%20+%20Unpin%20+%20%27a)" class="impl"><code class="in-band">impl<'a, T> <a class="trait" href="../futures_task/trait.UnsafeFutureObj.html" title="trait futures_task::UnsafeFutureObj">UnsafeFutureObj</a><'a, T> for &'a mut (dyn <a class="trait" href="https://doc.rust-lang.org/nightly/core/future/future/trait.Future.html" title="trait core::future::future::Future">Future</a><Output = T> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Unpin.html" title="trait core::marker::Unpin">Unpin</a> + 'a)</code><a href="#impl-UnsafeFutureObj%3C%27a%2C%20T%3E-for-%26%27a%20mut%20(dyn%20Future%3COutput%20=%20T%3E%20+%20Unpin%20+%20%27a)" class="anchor"></a><a class="srclink" href="../src/futures_task/future_obj.rs.html#192-199" title="goto source code">[src]</a></h3><div class="impl-items"><h4 id="method.into_raw" class="method hidden"><code>fn <a href="#method.into_raw" class="fnname">into_raw</a>(self) -> *mut dyn <a class="trait" href="https://doc.rust-lang.org/nightly/core/future/future/trait.Future.html" title="trait core::future::future::Future">Future</a><Output = T> + 'a</code><a class="srclink" href="../src/futures_task/future_obj.rs.html#194-196" title="goto source code">[src]</a></h4><h4 id="method.drop" class="method hidden"><code>unsafe fn <a href="#method.drop" class="fnname">drop</a>(_ptr: *mut dyn <a class="trait" href="https://doc.rust-lang.org/nightly/core/future/future/trait.Future.html" title="trait core::future::future::Future">Future</a><Output = T> + 'a)</code><a class="srclink" href="../src/futures_task/future_obj.rs.html#198" title="goto source code">[src]</a></h4></div><h3 id="impl-UnsafeFutureObj%3C%27a%2C%20T%3E-for-Pin%3C%26%27a%20mut%20F%3E" class="impl"><code class="in-band">impl<'a, T, F> <a class="trait" href="../futures_task/trait.UnsafeFutureObj.html" title="trait futures_task::UnsafeFutureObj">UnsafeFutureObj</a><'a, T> for <a class="struct" href="https://doc.rust-lang.org/nightly/core/pin/struct.Pin.html" title="struct core::pin::Pin">Pin</a><&'a mut F> <span class="where fmt-newline">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/future/future/trait.Future.html" title="trait core::future::future::Future">Future</a><Output = T> + 'a, </span></code><a href="#impl-UnsafeFutureObj%3C%27a%2C%20T%3E-for-Pin%3C%26%27a%20mut%20F%3E" class="anchor"></a><a class="srclink" href="../src/futures_task/future_obj.rs.html#201-210" title="goto source code">[src]</a></h3><div class="impl-items"><h4 id="method.into_raw-1" class="method hidden"><code>fn <a href="#method.into_raw" class="fnname">into_raw</a>(self) -> *mut dyn <a class="trait" href="https://doc.rust-lang.org/nightly/core/future/future/trait.Future.html" title="trait core::future::future::Future">Future</a><Output = T> + 'a</code><a class="srclink" href="../src/futures_task/future_obj.rs.html#205-207" title="goto source code">[src]</a></h4><h4 id="method.drop-1" class="method hidden"><code>unsafe fn <a href="#method.drop" class="fnname">drop</a>(_ptr: *mut dyn <a class="trait" href="https://doc.rust-lang.org/nightly/core/future/future/trait.Future.html" title="trait core::future::future::Future">Future</a><Output = T> + 'a)</code><a class="srclink" href="../src/futures_task/future_obj.rs.html#209" title="goto source code">[src]</a></h4></div><h3 id="impl-UnsafeFutureObj%3C%27a%2C%20T%3E-for-Pin%3C%26%27a%20mut%20(dyn%20Future%3COutput%20=%20T%3E%20+%20%27a)%3E" class="impl"><code class="in-band">impl<'a, T> <a class="trait" href="../futures_task/trait.UnsafeFutureObj.html" title="trait futures_task::UnsafeFutureObj">UnsafeFutureObj</a><'a, T> for <a class="struct" href="https://doc.rust-lang.org/nightly/core/pin/struct.Pin.html" title="struct core::pin::Pin">Pin</a><&'a mut (dyn <a class="trait" href="https://doc.rust-lang.org/nightly/core/future/future/trait.Future.html" title="trait core::future::future::Future">Future</a><Output = T> + 'a)></code><a href="#impl-UnsafeFutureObj%3C%27a%2C%20T%3E-for-Pin%3C%26%27a%20mut%20(dyn%20Future%3COutput%20=%20T%3E%20+%20%27a)%3E" class="anchor"></a><a class="srclink" href="../src/futures_task/future_obj.rs.html#212-219" title="goto source code">[src]</a></h3><div class="impl-items"><h4 id="method.into_raw-2" class="method hidden"><code>fn <a href="#method.into_raw" class="fnname">into_raw</a>(self) -> *mut dyn <a class="trait" href="https://doc.rust-lang.org/nightly/core/future/future/trait.Future.html" title="trait core::future::future::Future">Future</a><Output = T> + 'a</code><a class="srclink" href="../src/futures_task/future_obj.rs.html#214-216" title="goto source code">[src]</a></h4><h4 id="method.drop-2" class="method hidden"><code>unsafe fn <a href="#method.drop" class="fnname">drop</a>(_ptr: *mut dyn <a class="trait" href="https://doc.rust-lang.org/nightly/core/future/future/trait.Future.html" title="trait core::future::future::Future">Future</a><Output = T> + 'a)</code><a class="srclink" href="../src/futures_task/future_obj.rs.html#218" title="goto source code">[src]</a></h4></div><span class="loading-content">Loading content...</span><h2 id="implementors" class="small-section-header">Implementors<a href="#implementors" class="anchor"></a></h2><div class="item-list" id="implementors-list"><h3 id="impl-UnsafeFutureObj%3C%27a%2C%20T%3E" class="impl"><code class="in-band">impl<'a, T, F> UnsafeFutureObj<'a, T> for &'a mut F <span class="where fmt-newline">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/future/future/trait.Future.html" title="trait core::future::future::Future">Future</a><Output = T> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Unpin.html" title="trait core::marker::Unpin">Unpin</a> + 'a, </span></code><a href="#impl-UnsafeFutureObj%3C%27a%2C%20T%3E" class="anchor"></a><a class="srclink" href="../src/futures_task/future_obj.rs.html#181-190" title="goto source code">[src]</a></h3><div class="impl-items"><h4 id="method.into_raw-3" class="method hidden"><code>fn <a href="#method.into_raw-3" class="fnname">into_raw</a>(self) -> *mut dyn <a class="trait" href="https://doc.rust-lang.org/nightly/core/future/future/trait.Future.html" title="trait core::future::future::Future">Future</a><Output = T> + 'a</code><a class="srclink" href="../src/futures_task/future_obj.rs.html#185-187" title="goto source code">[src]</a></h4><h4 id="method.drop-3" class="method hidden"><code>unsafe fn <a href="#method.drop-3" class="fnname">drop</a>(_ptr: *mut dyn <a class="trait" href="https://doc.rust-lang.org/nightly/core/future/future/trait.Future.html" title="trait core::future::future::Future">Future</a><Output = T> + 'a)</code><a class="srclink" href="../src/futures_task/future_obj.rs.html#189" title="goto source code">[src]</a></h4></div></div><span class="loading-content">Loading content...</span><script type="text/javascript" src="../implementors/futures_task/trait.UnsafeFutureObj.js" async></script></section><section id="search" class="content hidden"></section><section class="footer"></section><script>window.rootPath = "../";window.currentCrate = "futures_task";</script><script src="../main.js"></script><script defer src="../search-index.js"></script></body></html> |