<!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 `Weak` struct in crate `alloc`."><meta name="keywords" content="rust, rustlang, rust-lang, Weak"><title>alloc::rc::Weak - 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="../../dark.css"><link rel="stylesheet" type="text/css" href="../../light.css" id="themeStyle"><script src="../../storage.js"></script><link rel="shortcut icon" href="https://doc.rust-lang.org/favicon.ico"></head><body class="rustdoc struct"><!--[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='../../alloc/index.html'><img src='https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png' alt='logo' width='100'></a><p class='location'>Struct Weak</p><div class="sidebar-elems"><div class="block items"><a class="sidebar-title" href="#methods">Methods</a><div class="sidebar-links"><a href="#method.new">new</a><a href="#method.upgrade">upgrade</a></div><a class="sidebar-title" href="#implementations">Trait Implementations</a><div class="sidebar-links"><a href="#impl-Send">!Send</a><a href="#impl-Sync">!Sync</a><a href="#impl-CoerceUnsized%3CWeak%3CU%3E%3E">CoerceUnsized<Weak<U>></a><a href="#impl-Drop">Drop</a><a href="#impl-Clone">Clone</a><a href="#impl-Debug">Debug</a><a href="#impl-Default">Default</a></div></div><p class='location'><a href='../index.html'>alloc</a>::<wbr><a href='index.html'>rc</a></p><script>window.sidebarCurrent = {name: 'Weak', ty: 'struct', relpath: ''};</script><script defer src="sidebar-items.js"></script></div></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!"><img src="../../brush.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices"></div></div><script src="../../theme.js"></script><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"><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='in-band'>Struct <a href='../index.html'>alloc</a>::<wbr><a href='index.html'>rc</a>::<wbr><a class="struct" href=''>Weak</a></span><span class='out-of-band'><span class='since' title='Stable since Rust version 1.4.0'>1.4.0</span><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/alloc/rc.rs.html#1155-1157' title='goto source code'>[src]</a></span></h1><div class="docblock type-decl"><pre class='rust struct'>pub struct Weak<T: ?<a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>> { /* fields omitted */ }</pre></div><div class='docblock'><p><code>Weak</code> is a version of <a href="struct.Rc.html"><code>Rc</code></a> that holds a non-owning reference to the
managed value. The value is accessed by calling <a href="struct.Weak.html#method.upgrade"><code>upgrade</code></a> on the <code>Weak</code>
pointer, which returns an <a href="../../std/option/enum.Option.html"><code>Option</code></a><code><</code><a href="struct.Rc.html"><code>Rc</code></a><code><T>></code>.</p>
<p>Since a <code>Weak</code> reference does not count towards ownership, it will not
prevent the inner value from being dropped, and <code>Weak</code> itself makes no
guarantees about the value still being present and may return <a href="../../std/option/enum.Option.html#variant.None"><code>None</code></a>
when <a href="struct.Weak.html#method.upgrade"><code>upgrade</code></a>d.</p>
<p>A <code>Weak</code> pointer is useful for keeping a temporary reference to the value
within <a href="struct.Rc.html"><code>Rc</code></a> without extending its lifetime. It is also used to prevent
circular references between <a href="struct.Rc.html"><code>Rc</code></a> pointers, since mutual owning references
would never allow either <a href="struct.Rc.html"><code>Rc</code></a> to be dropped. For example, a tree could
have strong <a href="struct.Rc.html"><code>Rc</code></a> pointers from parent nodes to children, and <code>Weak</code>
pointers from children back to their parents.</p>
<p>The typical way to obtain a <code>Weak</code> pointer is to call <a href="struct.Rc.html#method.downgrade"><code>Rc::downgrade</code></a>.</p>
</div>
<h2 id='methods' class='small-section-header'>
Methods<a href='#methods' class='anchor'></a>
</h2>
<h3 id='impl' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl<T> <a class="struct" href="../../alloc/rc/struct.Weak.html" title="struct alloc::rc::Weak">Weak</a><T></code><a href='#impl' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/alloc/rc.rs.html#1167-1194' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'><h4 id='method.new' class="method"><span id='new.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.new' class='fnname'>new</a>() -> <a class="struct" href="../../alloc/rc/struct.Weak.html" title="struct alloc::rc::Weak">Weak</a><T></code></span></td><td><span class='out-of-band'><div class='ghost'></div><div class='since' title='Stable since Rust version 1.10.0'>1.10.0</div><a class='srclink' href='../../src/alloc/rc.rs.html#1183-1193' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Constructs a new <code>Weak<T></code>, allocating memory for <code>T</code> without initializing
it. Calling <a href="struct.Weak.html#method.upgrade"><code>upgrade</code></a> on the return value always gives <a href="../../std/option/enum.Option.html"><code>None</code></a>.</p>
<h1 id="examples" class="section-header"><a href="#examples">Examples</a></h1>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">rc</span>::<span class="ident">Weak</span>;
<span class="kw">let</span> <span class="ident">empty</span>: <span class="ident">Weak</span><span class="op"><</span><span class="ident">i64</span><span class="op">></span> <span class="op">=</span> <span class="ident">Weak</span>::<span class="ident">new</span>();
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">empty</span>.<span class="ident">upgrade</span>().<span class="ident">is_none</span>());</pre>
</div></div><h3 id='impl-1' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl<T: ?<a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>> <a class="struct" href="../../alloc/rc/struct.Weak.html" title="struct alloc::rc::Weak">Weak</a><T></code><a href='#impl-1' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/alloc/rc.rs.html#1196-1232' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'><h4 id='method.upgrade' class="method"><span id='upgrade.v' class='invisible'><table class='table-display'><tbody><tr><td><code>pub fn <a href='#method.upgrade' class='fnname'>upgrade</a>(&self) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><<a class="struct" href="../../alloc/rc/struct.Rc.html" title="struct alloc::rc::Rc">Rc</a><T>></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/alloc/rc.rs.html#1224-1231' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Attempts to upgrade the <code>Weak</code> pointer to an <a href="struct.Rc.html"><code>Rc</code></a>, extending
the lifetime of the value if successful.</p>
<p>Returns <a href="../../std/option/enum.Option.html"><code>None</code></a> if the value has since been dropped.</p>
<h1 id="examples-1" class="section-header"><a href="#examples-1">Examples</a></h1>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">rc</span>::<span class="ident">Rc</span>;
<span class="kw">let</span> <span class="ident">five</span> <span class="op">=</span> <span class="ident">Rc</span>::<span class="ident">new</span>(<span class="number">5</span>);
<span class="kw">let</span> <span class="ident">weak_five</span> <span class="op">=</span> <span class="ident">Rc</span>::<span class="ident">downgrade</span>(<span class="kw-2">&</span><span class="ident">five</span>);
<span class="kw">let</span> <span class="ident">strong_five</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">Rc</span><span class="op"><</span><span class="kw">_</span><span class="op">>></span> <span class="op">=</span> <span class="ident">weak_five</span>.<span class="ident">upgrade</span>();
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">strong_five</span>.<span class="ident">is_some</span>());
<span class="comment">// Destroy all strong pointers.</span>
<span class="ident">drop</span>(<span class="ident">strong_five</span>);
<span class="ident">drop</span>(<span class="ident">five</span>);
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">weak_five</span>.<span class="ident">upgrade</span>().<span class="ident">is_none</span>());</pre>
</div></div>
<h2 id='implementations' class='small-section-header'>
Trait Implementations<a href='#implementations' class='anchor'></a>
</h2>
<div id='implementations-list'><h3 id='impl-Send' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl<T: ?<a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>> !<a class="trait" href="../../core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> for <a class="struct" href="../../alloc/rc/struct.Weak.html" title="struct alloc::rc::Weak">Weak</a><T></code><a href='#impl-Send' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/alloc/rc.rs.html#1160' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'></div><h3 id='impl-Sync' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl<T: ?<a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>> !<a class="trait" href="../../core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> for <a class="struct" href="../../alloc/rc/struct.Weak.html" title="struct alloc::rc::Weak">Weak</a><T></code><a href='#impl-Sync' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/alloc/rc.rs.html#1162' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'></div><h3 id='impl-CoerceUnsized%3CWeak%3CU%3E%3E' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl<T: ?<a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a> + <a class="trait" href="../../core/marker/trait.Unsize.html" title="trait core::marker::Unsize">Unsize</a><U>, U: ?<a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>> <a class="trait" href="../../core/ops/unsize/trait.CoerceUnsized.html" title="trait core::ops::unsize::CoerceUnsized">CoerceUnsized</a><<a class="struct" href="../../alloc/rc/struct.Weak.html" title="struct alloc::rc::Weak">Weak</a><U>> for <a class="struct" href="../../alloc/rc/struct.Weak.html" title="struct alloc::rc::Weak">Weak</a><T></code><a href='#impl-CoerceUnsized%3CWeak%3CU%3E%3E' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/alloc/rc.rs.html#1165' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'></div><h3 id='impl-Drop' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl<T: ?<a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>> <a class="trait" href="../../core/ops/drop/trait.Drop.html" title="trait core::ops::drop::Drop">Drop</a> for <a class="struct" href="../../alloc/rc/struct.Weak.html" title="struct alloc::rc::Weak">Weak</a><T></code><a href='#impl-Drop' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/alloc/rc.rs.html#1235-1270' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'><h4 id='method.drop' class="method"><span id='drop.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='../../core/ops/drop/trait.Drop.html#tymethod.drop' class='fnname'>drop</a>(&mut self)</code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/alloc/rc.rs.html#1260-1269' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Drops the <code>Weak</code> pointer.</p>
<h1 id="examples-2" class="section-header"><a href="#examples-2">Examples</a></h1>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">rc</span>::{<span class="ident">Rc</span>, <span class="ident">Weak</span>};
<span class="kw">struct</span> <span class="ident">Foo</span>;
<span class="kw">impl</span> <span class="ident">Drop</span> <span class="kw">for</span> <span class="ident">Foo</span> {
<span class="kw">fn</span> <span class="ident">drop</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) {
<span class="macro">println</span><span class="macro">!</span>(<span class="string">"dropped!"</span>);
}
}
<span class="kw">let</span> <span class="ident">foo</span> <span class="op">=</span> <span class="ident">Rc</span>::<span class="ident">new</span>(<span class="ident">Foo</span>);
<span class="kw">let</span> <span class="ident">weak_foo</span> <span class="op">=</span> <span class="ident">Rc</span>::<span class="ident">downgrade</span>(<span class="kw-2">&</span><span class="ident">foo</span>);
<span class="kw">let</span> <span class="ident">other_weak_foo</span> <span class="op">=</span> <span class="ident">Weak</span>::<span class="ident">clone</span>(<span class="kw-2">&</span><span class="ident">weak_foo</span>);
<span class="ident">drop</span>(<span class="ident">weak_foo</span>); <span class="comment">// Doesn't print anything</span>
<span class="ident">drop</span>(<span class="ident">foo</span>); <span class="comment">// Prints "dropped!"</span>
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">other_weak_foo</span>.<span class="ident">upgrade</span>().<span class="ident">is_none</span>());</pre>
</div></div><h3 id='impl-Clone' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl<T: ?<a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>> <a class="trait" href="../../core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a> for <a class="struct" href="../../alloc/rc/struct.Weak.html" title="struct alloc::rc::Weak">Weak</a><T></code><a href='#impl-Clone' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/alloc/rc.rs.html#1273-1290' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'><h4 id='method.clone' class="method"><span id='clone.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='../../core/clone/trait.Clone.html#tymethod.clone' class='fnname'>clone</a>(&self) -> <a class="struct" href="../../alloc/rc/struct.Weak.html" title="struct alloc::rc::Weak">Weak</a><T></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/alloc/rc.rs.html#1286-1289' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Makes a clone of the <code>Weak</code> pointer that points to the same value.</p>
<h1 id="examples-3" class="section-header"><a href="#examples-3">Examples</a></h1>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">rc</span>::{<span class="ident">Rc</span>, <span class="ident">Weak</span>};
<span class="kw">let</span> <span class="ident">weak_five</span> <span class="op">=</span> <span class="ident">Rc</span>::<span class="ident">downgrade</span>(<span class="kw-2">&</span><span class="ident">Rc</span>::<span class="ident">new</span>(<span class="number">5</span>));
<span class="ident">Weak</span>::<span class="ident">clone</span>(<span class="kw-2">&</span><span class="ident">weak_five</span>);</pre>
</div><h4 id='method.clone_from' class="method"><span id='clone_from.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='../../core/clone/trait.Clone.html#method.clone_from' class='fnname'>clone_from</a>(&mut self, source: &Self)</code></span></td><td><span class='out-of-band'><div class='ghost'></div><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div><a class='srclink' href='../../src/core/clone.rs.html#130-132' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Performs copy-assignment from <code>source</code>. <a href="../../core/clone/trait.Clone.html#method.clone_from">Read more</a></p>
</div></div><h3 id='impl-Debug' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl<T: ?<a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a> + <a class="trait" href="../../alloc/fmt/trait.Debug.html" title="trait alloc::fmt::Debug">Debug</a>> <a class="trait" href="../../alloc/fmt/trait.Debug.html" title="trait alloc::fmt::Debug">Debug</a> for <a class="struct" href="../../alloc/rc/struct.Weak.html" title="struct alloc::rc::Weak">Weak</a><T></code><a href='#impl-Debug' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/alloc/rc.rs.html#1293-1297' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'><h4 id='method.fmt' class="method"><span id='fmt.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='../../alloc/fmt/trait.Debug.html#tymethod.fmt' class='fnname'>fmt</a>(&self, f: &mut <a class="struct" href="../../alloc/fmt/struct.Formatter.html" title="struct alloc::fmt::Formatter">Formatter</a>) -> <a class="type" href="../../alloc/fmt/type.Result.html" title="type alloc::fmt::Result">Result</a></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/alloc/rc.rs.html#1294-1296' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Formats the value using the given formatter. <a href="../../alloc/fmt/trait.Debug.html#tymethod.fmt">Read more</a></p>
</div></div><h3 id='impl-Default' class='impl'><span class='in-band'><table class='table-display'><tbody><tr><td><code>impl<T> <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a> for <a class="struct" href="../../alloc/rc/struct.Weak.html" title="struct alloc::rc::Weak">Weak</a><T></code><a href='#impl-Default' class='anchor'></a></span></td><td><span class='out-of-band'><div class='ghost'></div><div class='since' title='Stable since Rust version 1.10.0'>1.10.0</div><a class='srclink' href='../../src/alloc/rc.rs.html#1300-1318' title='goto source code'>[src]</a></span></td></tr></tbody></table></h3><div class='impl-items'><h4 id='method.default' class="method"><span id='default.v' class='invisible'><table class='table-display'><tbody><tr><td><code>fn <a href='../../core/default/trait.Default.html#tymethod.default' class='fnname'>default</a>() -> <a class="struct" href="../../alloc/rc/struct.Weak.html" title="struct alloc::rc::Weak">Weak</a><T></code></span></td><td><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/alloc/rc.rs.html#1315-1317' title='goto source code'>[src]</a></td></tr></tbody></table></span></h4><div class='docblock'><p>Constructs a new <code>Weak<T></code>, allocating memory for <code>T</code> without initializing
it. Calling <a href="struct.Weak.html#method.upgrade"><code>upgrade</code></a> on the return value always gives <a href="../../std/option/enum.Option.html"><code>None</code></a>.</p>
<h1 id="examples-4" class="section-header"><a href="#examples-4">Examples</a></h1>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">rc</span>::<span class="ident">Weak</span>;
<span class="kw">let</span> <span class="ident">empty</span>: <span class="ident">Weak</span><span class="op"><</span><span class="ident">i64</span><span class="op">></span> <span class="op">=</span> <span class="ident">Default</span>::<span class="ident">default</span>();
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">empty</span>.<span class="ident">upgrade</span>().<span class="ident">is_none</span>());</pre>
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4e2dbb669434a7691662cb2f0ad38972
>
files
>
260
