<!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 `ToOwned` trait in crate `std`."><meta name="keywords" content="rust, rustlang, rust-lang, ToOwned"><title>std::borrow::ToOwned - Rust</title><link rel="stylesheet" type="text/css" href="../../normalize1.35.0.css"><link rel="stylesheet" type="text/css" href="../../rustdoc1.35.0.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../dark1.35.0.css"><link rel="stylesheet" type="text/css" href="../../light1.35.0.css" id="themeStyle"><script src="../../storage1.35.0.js"></script><noscript><link rel="stylesheet" href="../../noscript1.35.0.css"></noscript><link rel="shortcut icon" href="../../favicon1.35.0.ico"><style type="text/css">#crate-search{background-image:url("../../down-arrow1.35.0.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='../../std/index.html'><img src='../../rust-logo1.35.0.png' alt='logo' width='100'></a><p class='location'>Trait ToOwned</p><div class="sidebar-elems"><div class="block items"><a class="sidebar-title" href="#associated-types">Associated Types</a><div class="sidebar-links"><a href="#associatedtype.Owned">Owned</a></div><a class="sidebar-title" href="#required-methods">Required Methods</a><div class="sidebar-links"><a href="#tymethod.to_owned">to_owned</a></div><a class="sidebar-title" href="#provided-methods">Provided Methods</a><div class="sidebar-links"><a href="#method.clone_into">clone_into</a></div><a class="sidebar-title" href="#implementors">Implementors</a></div><p class='location'><a href='../index.html'>std</a>::<wbr><a href='index.html'>borrow</a></p><script>window.sidebarCurrent = {name: 'ToOwned', 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!"><img src="../../brush1.35.0.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices"></div></div><script src="../../theme1.35.0.js"></script><nav class="sub"><form class="search-form js-only"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><a id="settings-menu" href="../../settings.html"><img src="../../wheel1.35.0.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><h1 class='fqn'><span class='out-of-band'><span class='since' title='Stable since Rust version 1.0.0'>1.0.0</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/borrow.rs.html#34-77' title='goto source code'>[src]</a></span><span class='in-band'>Trait <a href='../index.html'>std</a>::<wbr><a href='index.html'>borrow</a>::<wbr><a class="trait" href=''>ToOwned</a></span></h1><div class="docblock type-decl hidden-by-usual-hider"><pre class='rust trait'>pub trait ToOwned {
type <a href='#associatedtype.Owned' class="type">Owned</a>: <a class="trait" href="../../std/borrow/trait.Borrow.html" title="trait std::borrow::Borrow">Borrow</a><Self>;
<div class="docblock attributes">#[must_use = "cloning is often expensive and is not expected to have side effects"]
</div>fn <a href='#tymethod.to_owned' class='fnname'>to_owned</a>(&self) -> Self::<a class="type" href="../../std/borrow/trait.ToOwned.html#associatedtype.Owned" title="type std::borrow::ToOwned::Owned">Owned</a>;
fn <a href='#method.clone_into' class='fnname'>clone_into</a>(&self, target: &mut Self::<a class="type" href="../../std/borrow/trait.ToOwned.html#associatedtype.Owned" title="type std::borrow::ToOwned::Owned">Owned</a>) { ... }
}</pre></div><div class='docblock'><p>A generalization of <code>Clone</code> to borrowed data.</p>
<p>Some types make it possible to go from borrowed to owned, usually by
implementing the <code>Clone</code> trait. But <code>Clone</code> works only for going from <code>&T</code>
to <code>T</code>. The <code>ToOwned</code> trait generalizes <code>Clone</code> to construct owned data
from any borrow of a given type.</p>
</div>
<h2 id='associated-types' class='small-section-header'>Associated Types<a href='#associated-types' class='anchor'></a></h2><div class='methods'><h3 id='associatedtype.Owned' class='method'><code id='Owned.t'>type <a href='#associatedtype.Owned' class="type">Owned</a>: <a class="trait" href="../../std/borrow/trait.Borrow.html" title="trait std::borrow::Borrow">Borrow</a><Self></code></h3></div><span class='loading-content'>Loading content...</span>
<h2 id='required-methods' class='small-section-header'>Required methods<a href='#required-methods' class='anchor'></a></h2><div class='methods'><h3 id='tymethod.to_owned' class='method'><code id='to_owned.v'><div class="docblock attributes">#[must_use = "cloning is often expensive and is not expected to have side effects"]
</div>fn <a href='#tymethod.to_owned' class='fnname'>to_owned</a>(&self) -> Self::<a class="type" href="../../std/borrow/trait.ToOwned.html#associatedtype.Owned" title="type std::borrow::ToOwned::Owned">Owned</a></code></h3><div class='docblock'><p>Creates owned data from borrowed data, usually by cloning.</p>
<h1 id="examples" class="section-header"><a href="#examples">Examples</a></h1>
<p>Basic usage:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered">
<span class="kw">let</span> <span class="ident">s</span>: <span class="kw-2">&</span><span class="ident">str</span> <span class="op">=</span> <span class="string">"a"</span>;
<span class="kw">let</span> <span class="ident">ss</span>: <span class="ident">String</span> <span class="op">=</span> <span class="ident">s</span>.<span class="ident">to_owned</span>();
<span class="kw">let</span> <span class="ident">v</span>: <span class="kw-2">&</span>[<span class="ident">i32</span>] <span class="op">=</span> <span class="kw-2">&</span>[<span class="number">1</span>, <span class="number">2</span>];
<span class="kw">let</span> <span class="ident">vv</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">i32</span><span class="op">></span> <span class="op">=</span> <span class="ident">v</span>.<span class="ident">to_owned</span>();<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0Afn%20main()%20%7B%0Alet%20s%3A%20%26str%20%3D%20%22a%22%3B%0Alet%20ss%3A%20String%20%3D%20s.to_owned()%3B%0A%0Alet%20v%3A%20%26%5Bi32%5D%20%3D%20%26%5B1%2C%202%5D%3B%0Alet%20vv%3A%20Vec%3Ci32%3E%20%3D%20v.to_owned()%3B%0A%7D">Run</a></pre></div>
</div></div><span class='loading-content'>Loading content...</span>
<h2 id='provided-methods' class='small-section-header'>Provided methods<a href='#provided-methods' class='anchor'></a></h2><div class='methods'><h3 id='method.clone_into' class='method'><code id='clone_into.v'>fn <a href='#method.clone_into' class='fnname'>clone_into</a>(&self, target: &mut Self::<a class="type" href="../../std/borrow/trait.ToOwned.html#associatedtype.Owned" title="type std::borrow::ToOwned::Owned">Owned</a>)</code></h3><div class='stability'><div class='stab unstable'><details><summary><span class='emoji'>🔬</span> This is a nightly-only experimental API. (<code>toowned_clone_into</code> <a href="https://github.com/rust-lang/rust/issues/41263">#41263</a>)</summary><p>recently added</p>
</details></div></div><div class='docblock'><p>Uses borrowed data to replace owned data, usually by cloning.</p>
<p>This is borrow-generalized version of <code>Clone::clone_from</code>.</p>
<h1 id="examples-1" class="section-header"><a href="#examples-1">Examples</a></h1>
<p>Basic usage:</p>
<div class="example-wrap"><pre class="rust rust-example-rendered">
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">s</span>: <span class="ident">String</span> <span class="op">=</span> <span class="ident">String</span>::<span class="ident">new</span>();
<span class="string">"hello"</span>.<span class="ident">clone_into</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">s</span>);
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">v</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">i32</span><span class="op">></span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="ident">new</span>();
[<span class="number">1</span>, <span class="number">2</span>][..].<span class="ident">clone_into</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">v</span>);<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0A%23!%5Bfeature(toowned_clone_into)%5D%0Afn%20main()%20%7B%0Alet%20mut%20s%3A%20String%20%3D%20String%3A%3Anew()%3B%0A%22hello%22.clone_into(%26mut%20s)%3B%0A%0Alet%20mut%20v%3A%20Vec%3Ci32%3E%20%3D%20Vec%3A%3Anew()%3B%0A%5B1%2C%202%5D%5B..%5D.clone_into(%26mut%20v)%3B%0A%7D&version=nightly">Run</a></pre></div>
</div></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-ToOwned' class='impl'><code class='in-band'>impl ToOwned for <a class="primitive" href="../primitive.str.html">str</a></code><a href='#impl-ToOwned' class='anchor'></a><a class='srclink' href='../../src/alloc/str.rs.html#192-204' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='associatedtype.Owned-1' class="type"><code id='Owned.t-1'>type <a href='#associatedtype.Owned-1' class="type">Owned</a> = <a class="struct" href="../../std/string/struct.String.html" title="struct std::string::String">String</a></code></h4><h4 id='method.to_owned' class="method hidden"><code id='to_owned.v-1'>fn <a href='#method.to_owned' class='fnname'>to_owned</a>(&self) -> <a class="struct" href="../../std/string/struct.String.html" title="struct std::string::String">String</a></code><a class='srclink' href='../../src/alloc/str.rs.html#195-197' title='goto source code'>[src]</a></h4><h4 id='method.clone_into-1' class="method hidden"><code id='clone_into.v-1'>fn <a href='#method.clone_into-1' class='fnname'>clone_into</a>(&self, target: &mut <a class="struct" href="../../std/string/struct.String.html" title="struct std::string::String">String</a>)</code><a class='srclink' href='../../src/alloc/str.rs.html#199-203' title='goto source code'>[src]</a></h4><div class='stability hidden'><div class='stab unstable'><details><summary><span class='emoji'>🔬</span> This is a nightly-only experimental API. (<code>toowned_clone_into</code> <a href="https://github.com/rust-lang/rust/issues/41263">#41263</a>)</summary><p>recently added</p>
</details></div></div></div><h3 id='impl-ToOwned-1' class='impl'><code class='in-band'>impl ToOwned for <a class="struct" href="../../std/ffi/struct.CStr.html" title="struct std::ffi::CStr">CStr</a></code><a href='#impl-ToOwned-1' class='anchor'></a><a class='srclink' href='../../src/std/ffi/c_str.rs.html#1262-1268' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='associatedtype.Owned-2' class="type"><code id='Owned.t-2'>type <a href='#associatedtype.Owned-2' class="type">Owned</a> = <a class="struct" href="../../std/ffi/struct.CString.html" title="struct std::ffi::CString">CString</a></code></h4><h4 id='method.to_owned-1' class="method hidden"><code id='to_owned.v-2'>fn <a href='#method.to_owned-1' class='fnname'>to_owned</a>(&self) -> <a class="struct" href="../../std/ffi/struct.CString.html" title="struct std::ffi::CString">CString</a></code><a class='srclink' href='../../src/std/ffi/c_str.rs.html#1265-1267' title='goto source code'>[src]</a></h4><h4 id='method.clone_into-2' class="method"><code id='clone_into.v-2'>fn <a href='../../std/borrow/trait.ToOwned.html#method.clone_into' class='fnname'>clone_into</a>(&self, target: &mut Self::<a class="type" href="../../std/borrow/trait.ToOwned.html#associatedtype.Owned" title="type std::borrow::ToOwned::Owned">Owned</a>)</code><a class='srclink' href='../../src/alloc/borrow.rs.html#74-76' title='goto source code'>[src]</a></h4><div class='stability'><div class='stab unstable'><details><summary><span class='emoji'>🔬</span> This is a nightly-only experimental API. (<code>toowned_clone_into</code> <a href="https://github.com/rust-lang/rust/issues/41263">#41263</a>)</summary><p>recently added</p>
</details></div></div></div><h3 id='impl-ToOwned-2' class='impl'><code class='in-band'>impl ToOwned for <a class="struct" href="../../std/ffi/struct.OsStr.html" title="struct std::ffi::OsStr">OsStr</a></code><a href='#impl-ToOwned-2' class='anchor'></a><a class='srclink' href='../../src/std/ffi/os_str.rs.html#911-920' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='associatedtype.Owned-3' class="type"><code id='Owned.t-3'>type <a href='#associatedtype.Owned-3' class="type">Owned</a> = <a class="struct" href="../../std/ffi/struct.OsString.html" title="struct std::ffi::OsString">OsString</a></code></h4><h4 id='method.to_owned-2' class="method hidden"><code id='to_owned.v-3'>fn <a href='#method.to_owned-2' class='fnname'>to_owned</a>(&self) -> <a class="struct" href="../../std/ffi/struct.OsString.html" title="struct std::ffi::OsString">OsString</a></code><a class='srclink' href='../../src/std/ffi/os_str.rs.html#913-915' title='goto source code'>[src]</a></h4><h4 id='method.clone_into-3' class="method hidden"><code id='clone_into.v-3'>fn <a href='#method.clone_into-3' class='fnname'>clone_into</a>(&self, target: &mut <a class="struct" href="../../std/ffi/struct.OsString.html" title="struct std::ffi::OsString">OsString</a>)</code><a class='srclink' href='../../src/std/ffi/os_str.rs.html#916-919' title='goto source code'>[src]</a></h4><div class='stability hidden'><div class='stab unstable'><details><summary><span class='emoji'>🔬</span> This is a nightly-only experimental API. (<code>toowned_clone_into</code> <a href="https://github.com/rust-lang/rust/issues/41263">#41263</a>)</summary><p>recently added</p>
</details></div></div></div><h3 id='impl-ToOwned-3' class='impl'><code class='in-band'>impl ToOwned for <a class="struct" href="../../std/path/struct.Path.html" title="struct std::path::Path">Path</a></code><a href='#impl-ToOwned-3' class='anchor'></a><a class='srclink' href='../../src/std/path.rs.html#1661-1669' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='associatedtype.Owned-4' class="type"><code id='Owned.t-4'>type <a href='#associatedtype.Owned-4' class="type">Owned</a> = <a class="struct" href="../../std/path/struct.PathBuf.html" title="struct std::path::PathBuf">PathBuf</a></code></h4><h4 id='method.to_owned-3' class="method hidden"><code id='to_owned.v-4'>fn <a href='#method.to_owned-3' class='fnname'>to_owned</a>(&self) -> <a class="struct" href="../../std/path/struct.PathBuf.html" title="struct std::path::PathBuf">PathBuf</a></code><a class='srclink' href='../../src/std/path.rs.html#1663-1665' title='goto source code'>[src]</a></h4><h4 id='method.clone_into-4' class="method hidden"><code id='clone_into.v-4'>fn <a href='#method.clone_into-4' class='fnname'>clone_into</a>(&self, target: &mut <a class="struct" href="../../std/path/struct.PathBuf.html" title="struct std::path::PathBuf">PathBuf</a>)</code><a class='srclink' href='../../src/std/path.rs.html#1666-1668' title='goto source code'>[src]</a></h4><div class='stability hidden'><div class='stab unstable'><details><summary><span class='emoji'>🔬</span> This is a nightly-only experimental API. (<code>toowned_clone_into</code> <a href="https://github.com/rust-lang/rust/issues/41263">#41263</a>)</summary><p>recently added</p>
</details></div></div></div><h3 id='impl-ToOwned-4' class='impl'><code class='in-band'>impl<T> ToOwned for <a class="primitive" href="../primitive.slice.html">[</a>T<a class="primitive" href="../primitive.slice.html">]</a> <span class="where fmt-newline">where<br> T: <a class="trait" href="../../std/clone/trait.Clone.html" title="trait std::clone::Clone">Clone</a>, </span></code><a href='#impl-ToOwned-4' class='anchor'></a><a class='srclink' href='../../src/alloc/slice.rs.html#634-658' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='associatedtype.Owned-5' class="type"><code id='Owned.t-5'>type <a href='#associatedtype.Owned-5' class="type">Owned</a> = <a class="struct" href="../../std/vec/struct.Vec.html" title="struct std::vec::Vec">Vec</a><T></code></h4><h4 id='method.to_owned-4' class="method hidden"><div class="important-traits"><div class='tooltip'>ⓘ<span class='tooltiptext'>Important traits for <a class="struct" href="../../std/vec/struct.Vec.html" title="struct std::vec::Vec">Vec</a><<a class="primitive" href="../primitive.u8.html">u8</a>></span></div><div class="content hidden"><h3 class="important">Important traits for <a class="struct" href="../../std/vec/struct.Vec.html" title="struct std::vec::Vec">Vec</a><<a class="primitive" href="../primitive.u8.html">u8</a>></h3><code class="content"><span class="where fmt-newline">impl <a class="trait" href="../../std/io/trait.Write.html" title="trait std::io::Write">Write</a> for <a class="struct" href="../../std/vec/struct.Vec.html" title="struct std::vec::Vec">Vec</a><<a class="primitive" href="../primitive.u8.html">u8</a>></span></code></div></div><code id='to_owned.v-5'>fn <a href='#method.to_owned-4' class='fnname'>to_owned</a>(&self) -> <a class="struct" href="../../std/vec/struct.Vec.html" title="struct std::vec::Vec">Vec</a><T></code><a class='srclink' href='../../src/alloc/slice.rs.html#637-639' title='goto source code'>[src]</a></h4><h4 id='method.clone_into-5' class="method hidden"><code id='clone_into.v-5'>fn <a href='#method.clone_into-5' class='fnname'>clone_into</a>(&self, target: &mut <a class="struct" href="../../std/vec/struct.Vec.html" title="struct std::vec::Vec">Vec</a><T>)</code><a class='srclink' href='../../src/alloc/slice.rs.html#646-657' title='goto source code'>[src]</a></h4><div class='stability hidden'><div class='stab unstable'><details><summary><span class='emoji'>🔬</span> This is a nightly-only experimental API. (<code>toowned_clone_into</code> <a href="https://github.com/rust-lang/rust/issues/41263">#41263</a>)</summary><p>recently added</p>
</details></div></div></div><h3 id='impl-ToOwned-5' class='impl'><code class='in-band'>impl<T> ToOwned for T <span class="where fmt-newline">where<br> T: <a class="trait" href="../../std/clone/trait.Clone.html" title="trait std::clone::Clone">Clone</a>, </span></code><a href='#impl-ToOwned-5' class='anchor'></a><a class='srclink' href='../../src/alloc/borrow.rs.html#80-91' title='goto source code'>[src]</a></h3><div class='impl-items'><h4 id='associatedtype.Owned-6' class="type"><code id='Owned.t-6'>type <a href='#associatedtype.Owned-6' class="type">Owned</a> = T</code></h4><h4 id='method.to_owned-5' class="method hidden"><code id='to_owned.v-6'>fn <a href='#method.to_owned-5' class='fnname'>to_owned</a>(&self) -> T</code><a class='srclink' href='../../src/alloc/borrow.rs.html#84-86' title='goto source code'>[src]</a></h4><h4 id='method.clone_into-6' class="method hidden"><code id='clone_into.v-6'>fn <a href='#method.clone_into-6' class='fnname'>clone_into</a>(&self, target: <a class="primitive" href="../primitive.reference.html">&mut </a>T)</code><a class='srclink' href='../../src/alloc/borrow.rs.html#88-90' title='goto source code'>[src]</a></h4><div class='stability hidden'><div class='stab unstable'><details><summary><span class='emoji'>🔬</span> This is a nightly-only experimental API. (<code>toowned_clone_into</code> <a href="https://github.com/rust-lang/rust/issues/41263">#41263</a>)</summary><p>recently added</p>
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