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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="Atomic memory orderings"><title>Ordering in atomic_polyfill - Rust</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/SourceSerif4-Regular-46f98efaafac5295.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/FiraSans-Regular-018c141bf0843ffd.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/FiraSans-Medium-8f9a781e4970d388.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/SourceCodePro-Regular-562dcc5011b6de7d.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/SourceSerif4-Bold-a2c9cd1067f8b328.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/SourceCodePro-Semibold-d899c5a5c4aeb14a.ttf.woff2"><link rel="stylesheet" href="../static.files/normalize-76eba96aa4d2e634.css"><link rel="stylesheet" href="../static.files/rustdoc-cb6f1f67f1bcd037.css" id="mainThemeStyle"><meta name="rustdoc-vars" data-root-path="../" data-static-root-path="../static.files/" data-current-crate="atomic_polyfill" data-themes="" data-resource-suffix="" data-rustdoc-version="1.73.0-nightly (8131b9774 2023-08-02)" data-channel="nightly" data-search-js="search-6dfdfced5eff6596.js" data-settings-js="settings-de11bff964e9d4e5.js" data-settings-css="settings-8c76f75bfb6bd192.css" data-theme-light-css="light-6d2c9675f3d09c26.css" data-theme-dark-css="dark-45ceb8f2e522f4d1.css" data-theme-ayu-css="ayu-fd19013d6ce078bf.css" ><script src="../static.files/storage-db41da1a38ea3cb8.js"></script><script defer src="sidebar-items.js"></script><script defer src="../static.files/main-0795b7d26be81095.js"></script><noscript><link rel="stylesheet" media="(prefers-color-scheme:light)" href="../static.files/light-6d2c9675f3d09c26.css"><link rel="stylesheet" media="(prefers-color-scheme:dark)" href="../static.files/dark-45ceb8f2e522f4d1.css"><link rel="stylesheet" href="../static.files/noscript-cffde32267a19fd6.css"></noscript><link rel="alternate icon" type="image/png" href="../static.files/favicon-16x16-8b506e7a72182f1c.png"><link rel="alternate icon" type="image/png" href="../static.files/favicon-32x32-422f7d1d52889060.png"><link rel="icon" type="image/svg+xml" href="../static.files/favicon-2c020d218678b618.svg"></head><body class="rustdoc enum"><!--[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="logo-container" href="../atomic_polyfill/index.html"><img class="rust-logo" src="../static.files/rust-logo-151179464ae7ed46.svg" alt="logo"></a><h2></h2></nav><nav class="sidebar"><a class="logo-container" href="../atomic_polyfill/index.html"><img class="rust-logo" src="../static.files/rust-logo-151179464ae7ed46.svg" alt="logo"></a><h2 class="location"><a href="#">Ordering</a></h2><div class="sidebar-elems"><section><h3><a href="#variants">Variants</a></h3><ul class="block"><li><a href="#variant.AcqRel">AcqRel</a></li><li><a href="#variant.Acquire">Acquire</a></li><li><a href="#variant.Relaxed">Relaxed</a></li><li><a href="#variant.Release">Release</a></li><li><a href="#variant.SeqCst">SeqCst</a></li></ul><h3><a href="#trait-implementations">Trait Implementations</a></h3><ul class="block"><li><a href="#impl-Clone-for-Ordering">Clone</a></li><li><a href="#impl-Copy-for-Ordering">Copy</a></li><li><a href="#impl-Debug-for-Ordering">Debug</a></li><li><a href="#impl-Eq-for-Ordering">Eq</a></li><li><a href="#impl-Hash-for-Ordering">Hash</a></li><li><a href="#impl-PartialEq%3COrdering%3E-for-Ordering">PartialEq<Ordering></a></li><li><a href="#impl-StructuralEq-for-Ordering">StructuralEq</a></li><li><a href="#impl-StructuralPartialEq-for-Ordering">StructuralPartialEq</a></li>
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Relaxed,
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Release,
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Acquire,
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AcqRel,
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SeqCst,
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}</code></pre><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Atomic memory orderings</p>
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<p>Memory orderings specify the way atomic operations synchronize memory.
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In its weakest <a href="enum.Ordering.html#variant.Relaxed" title="variant atomic_polyfill::Ordering::Relaxed"><code>Ordering::Relaxed</code></a>, only the memory directly touched by the
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operation is synchronized. On the other hand, a store-load pair of <a href="enum.Ordering.html#variant.SeqCst" title="variant atomic_polyfill::Ordering::SeqCst"><code>Ordering::SeqCst</code></a>
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operations synchronize other memory while additionally preserving a total order of such
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operations across all threads.</p>
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<p>Rust’s memory orderings are <a href="https://en.cppreference.com/w/cpp/atomic/memory_order">the same as those of
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C++20</a>.</p>
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<p>For more information see the <a href="../../../nomicon/atomics.html">nomicon</a>.</p>
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</div></details><h2 id="variants" class="variants small-section-header">Variants (Non-exhaustive)<a href="#variants" class="anchor">§</a></h2><details class="toggle non-exhaustive"><summary class="hideme"><span>This enum is marked as non-exhaustive</span></summary><div class="docblock">Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.</div></details><div class="variants"><section id="variant.Relaxed" class="variant"><a href="#variant.Relaxed" class="anchor">§</a><h3 class="code-header">Relaxed</h3></section><div class="docblock"><p>No ordering constraints, only atomic operations.</p>
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<p>Corresponds to <a href="https://en.cppreference.com/w/cpp/atomic/memory_order#Relaxed_ordering"><code>memory_order_relaxed</code></a> in C++20.</p>
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</div><section id="variant.Release" class="variant"><a href="#variant.Release" class="anchor">§</a><h3 class="code-header">Release</h3></section><div class="docblock"><p>When coupled with a store, all previous operations become ordered
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before any load of this value with <a href="enum.Ordering.html#variant.Acquire" title="variant atomic_polyfill::Ordering::Acquire"><code>Acquire</code></a> (or stronger) ordering.
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In particular, all previous writes become visible to all threads
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that perform an <a href="enum.Ordering.html#variant.Acquire" title="variant atomic_polyfill::Ordering::Acquire"><code>Acquire</code></a> (or stronger) load of this value.</p>
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<p>Notice that using this ordering for an operation that combines loads
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and stores leads to a <a href="enum.Ordering.html#variant.Relaxed" title="variant atomic_polyfill::Ordering::Relaxed"><code>Relaxed</code></a> load operation!</p>
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<p>This ordering is only applicable for operations that can perform a store.</p>
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<p>Corresponds to <a href="https://en.cppreference.com/w/cpp/atomic/memory_order#Release-Acquire_ordering"><code>memory_order_release</code></a> in C++20.</p>
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</div><section id="variant.Acquire" class="variant"><a href="#variant.Acquire" class="anchor">§</a><h3 class="code-header">Acquire</h3></section><div class="docblock"><p>When coupled with a load, if the loaded value was written by a store operation with
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<a href="enum.Ordering.html#variant.Release" title="variant atomic_polyfill::Ordering::Release"><code>Release</code></a> (or stronger) ordering, then all subsequent operations
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become ordered after that store. In particular, all subsequent loads will see data
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written before the store.</p>
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<p>Notice that using this ordering for an operation that combines loads
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and stores leads to a <a href="enum.Ordering.html#variant.Relaxed" title="variant atomic_polyfill::Ordering::Relaxed"><code>Relaxed</code></a> store operation!</p>
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<p>This ordering is only applicable for operations that can perform a load.</p>
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<p>Corresponds to <a href="https://en.cppreference.com/w/cpp/atomic/memory_order#Release-Acquire_ordering"><code>memory_order_acquire</code></a> in C++20.</p>
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</div><section id="variant.AcqRel" class="variant"><a href="#variant.AcqRel" class="anchor">§</a><h3 class="code-header">AcqRel</h3></section><div class="docblock"><p>Has the effects of both <a href="enum.Ordering.html#variant.Acquire" title="variant atomic_polyfill::Ordering::Acquire"><code>Acquire</code></a> and <a href="enum.Ordering.html#variant.Release" title="variant atomic_polyfill::Ordering::Release"><code>Release</code></a> together:
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For loads it uses <a href="enum.Ordering.html#variant.Acquire" title="variant atomic_polyfill::Ordering::Acquire"><code>Acquire</code></a> ordering. For stores it uses the <a href="enum.Ordering.html#variant.Release" title="variant atomic_polyfill::Ordering::Release"><code>Release</code></a> ordering.</p>
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<p>Notice that in the case of <code>compare_and_swap</code>, it is possible that the operation ends up
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not performing any store and hence it has just <a href="enum.Ordering.html#variant.Acquire" title="variant atomic_polyfill::Ordering::Acquire"><code>Acquire</code></a> ordering. However,
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<code>AcqRel</code> will never perform <a href="enum.Ordering.html#variant.Relaxed" title="variant atomic_polyfill::Ordering::Relaxed"><code>Relaxed</code></a> accesses.</p>
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<p>This ordering is only applicable for operations that combine both loads and stores.</p>
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<p>Corresponds to <a href="https://en.cppreference.com/w/cpp/atomic/memory_order#Release-Acquire_ordering"><code>memory_order_acq_rel</code></a> in C++20.</p>
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</div><section id="variant.SeqCst" class="variant"><a href="#variant.SeqCst" class="anchor">§</a><h3 class="code-header">SeqCst</h3></section><div class="docblock"><p>Like <a href="enum.Ordering.html#variant.Acquire" title="variant atomic_polyfill::Ordering::Acquire"><code>Acquire</code></a>/<a href="enum.Ordering.html#variant.Release" title="variant atomic_polyfill::Ordering::Release"><code>Release</code></a>/<a href="enum.Ordering.html#variant.AcqRel" title="variant atomic_polyfill::Ordering::AcqRel"><code>AcqRel</code></a> (for load, store, and load-with-store
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operations, respectively) with the additional guarantee that all threads see all
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sequentially consistent operations in the same order.</p>
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<p>Corresponds to <a href="https://en.cppreference.com/w/cpp/atomic/memory_order#Sequentially-consistent_ordering"><code>memory_order_seq_cst</code></a> in C++20.</p>
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</div></div><h2 id="trait-implementations" class="small-section-header">Trait Implementations<a href="#trait-implementations" class="anchor">§</a></h2><div id="trait-implementations-list"><details class="toggle implementors-toggle" open><summary><section id="impl-Clone-for-Ordering" class="impl"><a href="#impl-Clone-for-Ordering" class="anchor">§</a><h3 class="code-header">impl Clone for <a class="enum" href="enum.Ordering.html" title="enum atomic_polyfill::Ordering">Ordering</a></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.clone" class="method trait-impl"><a href="#method.clone" class="anchor">§</a><h4 class="code-header">fn <a class="fn">clone</a>(&self) -> <a class="enum" href="enum.Ordering.html" title="enum atomic_polyfill::Ordering">Ordering</a></h4></section></summary><div class='docblock'>Returns a copy of the value. <a>Read more</a></div></details><details class="toggle method-toggle" open><summary><section id="method.clone_from" class="method trait-impl"><a href="#method.clone_from" class="anchor">§</a><h4 class="code-header">fn <a class="fn">clone_from</a>(&mut self, source: &Self)</h4></section></summary><div class='docblock'>Performs copy-assignment from <code>source</code>. <a>Read more</a></div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-Debug-for-Ordering" class="impl"><a href="#impl-Debug-for-Ordering" class="anchor">§</a><h3 class="code-header">impl Debug for <a class="enum" href="enum.Ordering.html" title="enum atomic_polyfill::Ordering">Ordering</a></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.fmt" class="method trait-impl"><a href="#method.fmt" class="anchor">§</a><h4 class="code-header">fn <a class="fn">fmt</a>(&self, f: &mut Formatter<'_>) -> Result<(), Error></h4></section></summary><div class='docblock'>Formats the value using the given formatter. <a>Read more</a></div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-Hash-for-Ordering" class="impl"><a href="#impl-Hash-for-Ordering" class="anchor">§</a><h3 class="code-header">impl Hash for <a class="enum" href="enum.Ordering.html" title="enum atomic_polyfill::Ordering">Ordering</a></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.hash" class="method trait-impl"><a href="#method.hash" class="anchor">§</a><h4 class="code-header">fn <a class="fn">hash</a><__H>(&self, state: &mut __H)<span class="where fmt-newline">where
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__H: Hasher,</span></h4></section></summary><div class='docblock'>Feeds this value into the given [<code>Hasher</code>]. <a>Read more</a></div></details><details class="toggle method-toggle" open><summary><section id="method.hash_slice" class="method trait-impl"><span class="since rightside" title="Stable since Rust version 1.3.0">1.3.0</span><a href="#method.hash_slice" class="anchor">§</a><h4 class="code-header">fn <a class="fn">hash_slice</a><H>(data: &[Self], state: &mut H)<span class="where fmt-newline">where
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H: Hasher,
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Self: Sized,</span></h4></section></summary><div class='docblock'>Feeds a slice of this type into the given [<code>Hasher</code>]. <a>Read more</a></div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-PartialEq%3COrdering%3E-for-Ordering" class="impl"><a href="#impl-PartialEq%3COrdering%3E-for-Ordering" class="anchor">§</a><h3 class="code-header">impl PartialEq<<a class="enum" href="enum.Ordering.html" title="enum atomic_polyfill::Ordering">Ordering</a>> for <a class="enum" href="enum.Ordering.html" title="enum atomic_polyfill::Ordering">Ordering</a></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.eq" class="method trait-impl"><a href="#method.eq" class="anchor">§</a><h4 class="code-header">fn <a class="fn">eq</a>(&self, other: &<a class="enum" href="enum.Ordering.html" title="enum atomic_polyfill::Ordering">Ordering</a>) -> bool</h4></section></summary><div class='docblock'>This method tests for <code>self</code> and <code>other</code> values to be equal, and is used
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by <code>==</code>.</div></details><details class="toggle method-toggle" open><summary><section id="method.ne" class="method trait-impl"><a href="#method.ne" class="anchor">§</a><h4 class="code-header">fn <a class="fn">ne</a>(&self, other: &Rhs) -> bool</h4></section></summary><div class='docblock'>This method tests for <code>!=</code>. The default implementation is almost always
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sufficient, and should not be overridden without very good reason.</div></details></div></details><section id="impl-Copy-for-Ordering" class="impl"><a href="#impl-Copy-for-Ordering" class="anchor">§</a><h3 class="code-header">impl Copy for <a class="enum" href="enum.Ordering.html" title="enum atomic_polyfill::Ordering">Ordering</a></h3></section><section id="impl-Eq-for-Ordering" class="impl"><a href="#impl-Eq-for-Ordering" class="anchor">§</a><h3 class="code-header">impl Eq for <a class="enum" href="enum.Ordering.html" title="enum atomic_polyfill::Ordering">Ordering</a></h3></section><section id="impl-StructuralEq-for-Ordering" class="impl"><a href="#impl-StructuralEq-for-Ordering" class="anchor">§</a><h3 class="code-header">impl StructuralEq for <a class="enum" href="enum.Ordering.html" title="enum atomic_polyfill::Ordering">Ordering</a></h3></section><section id="impl-StructuralPartialEq-for-Ordering" class="impl"><a href="#impl-StructuralPartialEq-for-Ordering" class="anchor">§</a><h3 class="code-header">impl StructuralPartialEq for <a class="enum" href="enum.Ordering.html" title="enum atomic_polyfill::Ordering">Ordering</a></h3></section></div><h2 id="synthetic-implementations" class="small-section-header">Auto Trait Implementations<a href="#synthetic-implementations" class="anchor">§</a></h2><div id="synthetic-implementations-list"><section id="impl-RefUnwindSafe-for-Ordering" class="impl"><a href="#impl-RefUnwindSafe-for-Ordering" class="anchor">§</a><h3 class="code-header">impl RefUnwindSafe for <a class="enum" href="enum.Ordering.html" title="enum atomic_polyfill::Ordering">Ordering</a></h3></section><section id="impl-Send-for-Ordering" class="impl"><a href="#impl-Send-for-Ordering" class="anchor">§</a><h3 class="code-header">impl Send for <a class="enum" href="enum.Ordering.html" title="enum atomic_polyfill::Ordering">Ordering</a></h3></section><section id="impl-Sync-for-Ordering" class="impl"><a href="#impl-Sync-for-Ordering" class="anchor">§</a><h3 class="code-header">impl Sync for <a class="enum" href="enum.Ordering.html" title="enum atomic_polyfill::Ordering">Ordering</a></h3></section><section id="impl-Unpin-for-Ordering" class="impl"><a href="#impl-Unpin-for-Ordering" class="anchor">§</a><h3 class="code-header">impl Unpin for <a class="enum" href="enum.Ordering.html" title="enum atomic_polyfill::Ordering">Ordering</a></h3></section><section id="impl-UnwindSafe-for-Ordering" class="impl"><a href="#impl-UnwindSafe-for-Ordering" class="anchor">§</a><h3 class="code-header">impl UnwindSafe for <a class="enum" href="enum.Ordering.html" title="enum atomic_polyfill::Ordering">Ordering</a></h3></section></div><h2 id="blanket-implementations" class="small-section-header">Blanket Implementations<a href="#blanket-implementations" class="anchor">§</a></h2><div id="blanket-implementations-list"><details class="toggle implementors-toggle"><summary><section id="impl-Any-for-Ordering" class="impl"><a href="#impl-Any-for-Ordering" class="anchor">§</a><h3 class="code-header">impl<T> Any for T<span class="where fmt-newline">where
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T: 'static + ?Sized,</span></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.type_id" class="method trait-impl"><a href="#method.type_id" class="anchor">§</a><h4 class="code-header">fn <a class="fn">type_id</a>(&self) -> TypeId</h4></section></summary><div class='docblock'>Gets the <code>TypeId</code> of <code>self</code>. <a>Read more</a></div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-Borrow%3CT%3E-for-Ordering" class="impl"><a href="#impl-Borrow%3CT%3E-for-Ordering" class="anchor">§</a><h3 class="code-header">impl<T> Borrow<T> for T<span class="where fmt-newline">where
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T: ?Sized,</span></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.borrow" class="method trait-impl"><a href="#method.borrow" class="anchor">§</a><h4 class="code-header">fn <a class="fn">borrow</a>(&self) -> &T</h4></section></summary><div class='docblock'>Immutably borrows from an owned value. <a>Read more</a></div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-BorrowMut%3CT%3E-for-Ordering" class="impl"><a href="#impl-BorrowMut%3CT%3E-for-Ordering" class="anchor">§</a><h3 class="code-header">impl<T> BorrowMut<T> for T<span class="where fmt-newline">where
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T: ?Sized,</span></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.borrow_mut" class="method trait-impl"><a href="#method.borrow_mut" class="anchor">§</a><h4 class="code-header">fn <a class="fn">borrow_mut</a>(&mut self) -> &mut T</h4></section></summary><div class='docblock'>Mutably borrows from an owned value. <a>Read more</a></div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-From%3CT%3E-for-Ordering" class="impl"><a href="#impl-From%3CT%3E-for-Ordering" class="anchor">§</a><h3 class="code-header">impl<T> From<T> for T</h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.from" class="method trait-impl"><a href="#method.from" class="anchor">§</a><h4 class="code-header">fn <a class="fn">from</a>(t: T) -> T</h4></section></summary><div class="docblock"><p>Returns the argument unchanged.</p>
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</div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-Into%3CU%3E-for-Ordering" class="impl"><a href="#impl-Into%3CU%3E-for-Ordering" class="anchor">§</a><h3 class="code-header">impl<T, U> Into<U> for T<span class="where fmt-newline">where
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U: From<T>,</span></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.into" class="method trait-impl"><a href="#method.into" class="anchor">§</a><h4 class="code-header">fn <a class="fn">into</a>(self) -> U</h4></section></summary><div class="docblock"><p>Calls <code>U::from(self)</code>.</p>
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<p>That is, this conversion is whatever the implementation of
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<code>[From]<T> for U</code> chooses to do.</p>
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</div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-TryFrom%3CU%3E-for-Ordering" class="impl"><a href="#impl-TryFrom%3CU%3E-for-Ordering" class="anchor">§</a><h3 class="code-header">impl<T, U> TryFrom<U> for T<span class="where fmt-newline">where
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U: Into<T>,</span></h3></section></summary><div class="impl-items"><details class="toggle" open><summary><section id="associatedtype.Error-1" class="associatedtype trait-impl"><a href="#associatedtype.Error-1" class="anchor">§</a><h4 class="code-header">type <a class="associatedtype">Error</a> = Infallible</h4></section></summary><div class='docblock'>The type returned in the event of a conversion error.</div></details><details class="toggle method-toggle" open><summary><section id="method.try_from" class="method trait-impl"><a href="#method.try_from" class="anchor">§</a><h4 class="code-header">fn <a class="fn">try_from</a>(value: U) -> Result<T, <T as TryFrom<U>>::Error></h4></section></summary><div class='docblock'>Performs the conversion.</div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-TryInto%3CU%3E-for-Ordering" class="impl"><a href="#impl-TryInto%3CU%3E-for-Ordering" class="anchor">§</a><h3 class="code-header">impl<T, U> TryInto<U> for T<span class="where fmt-newline">where
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U: TryFrom<T>,</span></h3></section></summary><div class="impl-items"><details class="toggle" open><summary><section id="associatedtype.Error" class="associatedtype trait-impl"><a href="#associatedtype.Error" class="anchor">§</a><h4 class="code-header">type <a class="associatedtype">Error</a> = <U as TryFrom<T>>::Error</h4></section></summary><div class='docblock'>The type returned in the event of a conversion error.</div></details><details class="toggle method-toggle" open><summary><section id="method.try_into" class="method trait-impl"><a href="#method.try_into" class="anchor">§</a><h4 class="code-header">fn <a class="fn">try_into</a>(self) -> Result<U, <U as TryFrom<T>>::Error></h4></section></summary><div class='docblock'>Performs the conversion.</div></details></div></details></div></section></div></main></body></html>
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