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<p class='location'>Struct OccupiedEntry</p><div class="sidebar-elems"><div class="block items"><a class="sidebar-title" href="#methods">Methods</a><div class="sidebar-links"><a href="#method.key">key</a><a href="#method.remove_entry">remove_entry</a><a href="#method.get">get</a><a href="#method.get_mut">get_mut</a><a href="#method.into_mut">into_mut</a><a href="#method.insert">insert</a><a href="#method.remove">remove</a></div><a class="sidebar-title" href="#implementations">Trait Implementations</a><div class="sidebar-links"><a href="#impl-Debug">Debug</a></div></div><p class='location'><a href='../../index.html'>std</a>::<wbr><a href='../index.html'>collections</a>::<wbr><a href='index.html'>btree_map</a></p><script>window.sidebarCurrent = {name: 'OccupiedEntry', ty: 'struct', relpath: ''};</script><script defer src="sidebar-items.js"></script></div>
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<h1 class='fqn'><span class='in-band'>Struct <a href='../../index.html'>std</a>::<wbr><a href='../index.html'>collections</a>::<wbr><a href='index.html'>btree_map</a>::<wbr><a class="struct" href=''>OccupiedEntry</a></span><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/btree/map.rs.html#483-490' title='goto source code'>[src]</a></span></h1>
<pre class='rust struct'>pub struct OccupiedEntry<'a, K, V> <span class="where fmt-newline">where<br> K: 'a,<br> V: 'a, </span> { /* fields omitted */ }</pre><div class='docblock'><p>A view into an occupied entry in a <code>BTreeMap</code>.
It is part of the <a href="enum.Entry.html"><code>Entry</code></a> enum.</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'><code>impl<'a, K, V> <a class="struct" href="../../../std/collections/btree_map/struct.OccupiedEntry.html" title="struct std::collections::btree_map::OccupiedEntry">OccupiedEntry</a><'a, K, V> <span class="where fmt-newline">where<br> K: <a class="trait" href="../../../std/cmp/trait.Ord.html" title="trait std::cmp::Ord">Ord</a>, </span></code><a href='#impl' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../../src/alloc/btree/map.rs.html#2269-2463' title='goto source code'>[src]</a></span></h3>
<div class='impl-items'><h4 id='method.key' class="method"><div class="important-traits"><div class='tooltip'>ⓘ<span class='tooltiptext'>Important traits for <a class="primitive" href="../../primitive.reference.html">&'a mut </a>I</span></div><div class="content hidden"><h3 class="important">Important traits for <a class="primitive" href="../../primitive.reference.html">&'a mut </a>I</h3><code class="content"><span class="where fmt-newline">impl<'a, I> <a class="trait" href="../../../std/iter/trait.Iterator.html" title="trait std::iter::Iterator">Iterator</a> for <a class="primitive" href="../../primitive.reference.html">&'a mut </a>I <span class="where fmt-newline">where<br> I: <a class="trait" href="../../../std/iter/trait.Iterator.html" title="trait std::iter::Iterator">Iterator</a> + ?<a class="trait" href="../../../std/marker/trait.Sized.html" title="trait std::marker::Sized">Sized</a>, </span></span><span class="where fmt-newline"> type <a href='../../../std/iter/trait.Iterator.html#associatedtype.Item' class="type">Item</a> = <I as <a class="trait" href="../../../std/iter/trait.Iterator.html" title="trait std::iter::Iterator">Iterator</a>>::<a class="type" href="../../../std/iter/trait.Iterator.html#associatedtype.Item" title="type std::iter::Iterator::Item">Item</a>;</span><span class="where fmt-newline">impl<'a, R: <a class="trait" href="../../../std/io/trait.Read.html" title="trait std::io::Read">Read</a> + ?<a class="trait" href="../../../std/marker/trait.Sized.html" title="trait std::marker::Sized">Sized</a>> <a class="trait" href="../../../std/io/trait.Read.html" title="trait std::io::Read">Read</a> for <a class="primitive" href="../../primitive.reference.html">&'a mut </a>R</span><span class="where fmt-newline">impl<'a, W: <a class="trait" href="../../../std/io/trait.Write.html" title="trait std::io::Write">Write</a> + ?<a class="trait" href="../../../std/marker/trait.Sized.html" title="trait std::marker::Sized">Sized</a>> <a class="trait" href="../../../std/io/trait.Write.html" title="trait std::io::Write">Write</a> for <a class="primitive" href="../../primitive.reference.html">&'a mut </a>W</span></code></div></div><span id='key.v' class='invisible'><code>pub fn <a href='#method.key' class='fnname'>key</a>(&self) -> <a class="primitive" href="../../primitive.reference.html">&</a>K</code></span><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/btree/map.rs.html#2282-2284' title='goto source code'>[src]</a></span></h4>
<div class='docblock'><p>Gets a reference to the key in the entry.</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">collections</span>::<span class="ident">BTreeMap</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">map</span>: <span class="ident">BTreeMap</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">str</span>, <span class="ident">usize</span><span class="op">></span> <span class="op">=</span> <span class="ident">BTreeMap</span>::<span class="ident">new</span>();
<span class="ident">map</span>.<span class="ident">entry</span>(<span class="string">"poneyland"</span>).<span class="ident">or_insert</span>(<span class="number">12</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">map</span>.<span class="ident">entry</span>(<span class="string">"poneyland"</span>).<span class="ident">key</span>(), <span class="kw-2">&</span><span class="string">"poneyland"</span>);<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0Afn%20main()%20%7B%0Ause%20std%3A%3Acollections%3A%3ABTreeMap%3B%0A%0Alet%20mut%20map%3A%20BTreeMap%3C%26str%2C%20usize%3E%20%3D%20BTreeMap%3A%3Anew()%3B%0Amap.entry(%22poneyland%22).or_insert(12)%3B%0Aassert_eq!(map.entry(%22poneyland%22).key()%2C%20%26%22poneyland%22)%3B%0A%7D">Run</a></pre>
</div><h4 id='method.remove_entry' class="method"><span id='remove_entry.v' class='invisible'><code>pub fn <a href='#method.remove_entry' class='fnname'>remove_entry</a>(self) -> <a class="primitive" href="../../primitive.tuple.html">(</a>K, V<a class="primitive" href="../../primitive.tuple.html">)</a></code></span><span class='out-of-band'><div class='ghost'></div><div class='since' title='Stable since Rust version 1.12.0'>1.12.0</div><a class='srclink' href='../../../src/alloc/btree/map.rs.html#2306-2308' title='goto source code'>[src]</a></span></h4>
<div class='docblock'><p>Take ownership of the key and value from the map.</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">collections</span>::<span class="ident">BTreeMap</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">collections</span>::<span class="ident">btree_map</span>::<span class="ident">Entry</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">map</span>: <span class="ident">BTreeMap</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">str</span>, <span class="ident">usize</span><span class="op">></span> <span class="op">=</span> <span class="ident">BTreeMap</span>::<span class="ident">new</span>();
<span class="ident">map</span>.<span class="ident">entry</span>(<span class="string">"poneyland"</span>).<span class="ident">or_insert</span>(<span class="number">12</span>);
<span class="kw">if</span> <span class="kw">let</span> <span class="ident">Entry</span>::<span class="ident">Occupied</span>(<span class="ident">o</span>) <span class="op">=</span> <span class="ident">map</span>.<span class="ident">entry</span>(<span class="string">"poneyland"</span>) {
<span class="comment">// We delete the entry from the map.</span>
<span class="ident">o</span>.<span class="ident">remove_entry</span>();
}
<span class="comment">// If now try to get the value, it will panic:</span>
<span class="comment">// println!("{}", map["poneyland"]);</span><a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0Afn%20main()%20%7B%0Ause%20std%3A%3Acollections%3A%3ABTreeMap%3B%0Ause%20std%3A%3Acollections%3A%3Abtree_map%3A%3AEntry%3B%0A%0Alet%20mut%20map%3A%20BTreeMap%3C%26str%2C%20usize%3E%20%3D%20BTreeMap%3A%3Anew()%3B%0Amap.entry(%22poneyland%22).or_insert(12)%3B%0A%0Aif%20let%20Entry%3A%3AOccupied(o)%20%3D%20map.entry(%22poneyland%22)%20%7B%0A%20%20%20%20%2F%2F%20We%20delete%20the%20entry%20from%20the%20map.%0A%20%20%20%20o.remove_entry()%3B%0A%7D%0A%0A%2F%2F%20If%20now%20try%20to%20get%20the%20value%2C%20it%20will%20panic%3A%0A%2F%2F%20println!(%22%7B%7D%22%2C%20map%5B%22poneyland%22%5D)%3B%0A%7D">Run</a></pre>
</div><h4 id='method.get' class="method"><div class="important-traits"><div class='tooltip'>ⓘ<span class='tooltiptext'>Important traits for <a class="primitive" href="../../primitive.reference.html">&'a mut </a>I</span></div><div class="content hidden"><h3 class="important">Important traits for <a class="primitive" href="../../primitive.reference.html">&'a mut </a>I</h3><code class="content"><span class="where fmt-newline">impl<'a, I> <a class="trait" href="../../../std/iter/trait.Iterator.html" title="trait std::iter::Iterator">Iterator</a> for <a class="primitive" href="../../primitive.reference.html">&'a mut </a>I <span class="where fmt-newline">where<br> I: <a class="trait" href="../../../std/iter/trait.Iterator.html" title="trait std::iter::Iterator">Iterator</a> + ?<a class="trait" href="../../../std/marker/trait.Sized.html" title="trait std::marker::Sized">Sized</a>, </span></span><span class="where fmt-newline"> type <a href='../../../std/iter/trait.Iterator.html#associatedtype.Item' class="type">Item</a> = <I as <a class="trait" href="../../../std/iter/trait.Iterator.html" title="trait std::iter::Iterator">Iterator</a>>::<a class="type" href="../../../std/iter/trait.Iterator.html#associatedtype.Item" title="type std::iter::Iterator::Item">Item</a>;</span><span class="where fmt-newline">impl<'a, R: <a class="trait" href="../../../std/io/trait.Read.html" title="trait std::io::Read">Read</a> + ?<a class="trait" href="../../../std/marker/trait.Sized.html" title="trait std::marker::Sized">Sized</a>> <a class="trait" href="../../../std/io/trait.Read.html" title="trait std::io::Read">Read</a> for <a class="primitive" href="../../primitive.reference.html">&'a mut </a>R</span><span class="where fmt-newline">impl<'a, W: <a class="trait" href="../../../std/io/trait.Write.html" title="trait std::io::Write">Write</a> + ?<a class="trait" href="../../../std/marker/trait.Sized.html" title="trait std::marker::Sized">Sized</a>> <a class="trait" href="../../../std/io/trait.Write.html" title="trait std::io::Write">Write</a> for <a class="primitive" href="../../primitive.reference.html">&'a mut </a>W</span></code></div></div><span id='get.v' class='invisible'><code>pub fn <a href='#method.get' class='fnname'>get</a>(&self) -> <a class="primitive" href="../../primitive.reference.html">&</a>V</code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../../src/alloc/btree/map.rs.html#2326-2328' title='goto source code'>[src]</a></span></h4>
<div class='docblock'><p>Gets a reference to the value in the entry.</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">collections</span>::<span class="ident">BTreeMap</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">collections</span>::<span class="ident">btree_map</span>::<span class="ident">Entry</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">map</span>: <span class="ident">BTreeMap</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">str</span>, <span class="ident">usize</span><span class="op">></span> <span class="op">=</span> <span class="ident">BTreeMap</span>::<span class="ident">new</span>();
<span class="ident">map</span>.<span class="ident">entry</span>(<span class="string">"poneyland"</span>).<span class="ident">or_insert</span>(<span class="number">12</span>);
<span class="kw">if</span> <span class="kw">let</span> <span class="ident">Entry</span>::<span class="ident">Occupied</span>(<span class="ident">o</span>) <span class="op">=</span> <span class="ident">map</span>.<span class="ident">entry</span>(<span class="string">"poneyland"</span>) {
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">o</span>.<span class="ident">get</span>(), <span class="kw-2">&</span><span class="number">12</span>);
}<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0Afn%20main()%20%7B%0Ause%20std%3A%3Acollections%3A%3ABTreeMap%3B%0Ause%20std%3A%3Acollections%3A%3Abtree_map%3A%3AEntry%3B%0A%0Alet%20mut%20map%3A%20BTreeMap%3C%26str%2C%20usize%3E%20%3D%20BTreeMap%3A%3Anew()%3B%0Amap.entry(%22poneyland%22).or_insert(12)%3B%0A%0Aif%20let%20Entry%3A%3AOccupied(o)%20%3D%20map.entry(%22poneyland%22)%20%7B%0A%20%20%20%20assert_eq!(o.get()%2C%20%2612)%3B%0A%7D%0A%7D">Run</a></pre>
</div><h4 id='method.get_mut' class="method"><div class="important-traits"><div class='tooltip'>ⓘ<span class='tooltiptext'>Important traits for <a class="primitive" href="../../primitive.reference.html">&'a mut </a>I</span></div><div class="content hidden"><h3 class="important">Important traits for <a class="primitive" href="../../primitive.reference.html">&'a mut </a>I</h3><code class="content"><span class="where fmt-newline">impl<'a, I> <a class="trait" href="../../../std/iter/trait.Iterator.html" title="trait std::iter::Iterator">Iterator</a> for <a class="primitive" href="../../primitive.reference.html">&'a mut </a>I <span class="where fmt-newline">where<br> I: <a class="trait" href="../../../std/iter/trait.Iterator.html" title="trait std::iter::Iterator">Iterator</a> + ?<a class="trait" href="../../../std/marker/trait.Sized.html" title="trait std::marker::Sized">Sized</a>, </span></span><span class="where fmt-newline"> type <a href='../../../std/iter/trait.Iterator.html#associatedtype.Item' class="type">Item</a> = <I as <a class="trait" href="../../../std/iter/trait.Iterator.html" title="trait std::iter::Iterator">Iterator</a>>::<a class="type" href="../../../std/iter/trait.Iterator.html#associatedtype.Item" title="type std::iter::Iterator::Item">Item</a>;</span><span class="where fmt-newline">impl<'a, R: <a class="trait" href="../../../std/io/trait.Read.html" title="trait std::io::Read">Read</a> + ?<a class="trait" href="../../../std/marker/trait.Sized.html" title="trait std::marker::Sized">Sized</a>> <a class="trait" href="../../../std/io/trait.Read.html" title="trait std::io::Read">Read</a> for <a class="primitive" href="../../primitive.reference.html">&'a mut </a>R</span><span class="where fmt-newline">impl<'a, W: <a class="trait" href="../../../std/io/trait.Write.html" title="trait std::io::Write">Write</a> + ?<a class="trait" href="../../../std/marker/trait.Sized.html" title="trait std::marker::Sized">Sized</a>> <a class="trait" href="../../../std/io/trait.Write.html" title="trait std::io::Write">Write</a> for <a class="primitive" href="../../primitive.reference.html">&'a mut </a>W</span></code></div></div><span id='get_mut.v' class='invisible'><code>pub fn <a href='#method.get_mut' class='fnname'>get_mut</a>(&mut self) -> <a class="primitive" href="../../primitive.reference.html">&mut </a>V</code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../../src/alloc/btree/map.rs.html#2348-2350' title='goto source code'>[src]</a></span></h4>
<div class='docblock'><p>Gets a mutable reference to the value in the entry.</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">collections</span>::<span class="ident">BTreeMap</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">collections</span>::<span class="ident">btree_map</span>::<span class="ident">Entry</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">map</span>: <span class="ident">BTreeMap</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">str</span>, <span class="ident">usize</span><span class="op">></span> <span class="op">=</span> <span class="ident">BTreeMap</span>::<span class="ident">new</span>();
<span class="ident">map</span>.<span class="ident">entry</span>(<span class="string">"poneyland"</span>).<span class="ident">or_insert</span>(<span class="number">12</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">map</span>[<span class="string">"poneyland"</span>], <span class="number">12</span>);
<span class="kw">if</span> <span class="kw">let</span> <span class="ident">Entry</span>::<span class="ident">Occupied</span>(<span class="kw-2">mut</span> <span class="ident">o</span>) <span class="op">=</span> <span class="ident">map</span>.<span class="ident">entry</span>(<span class="string">"poneyland"</span>) {
<span class="kw-2">*</span><span class="ident">o</span>.<span class="ident">get_mut</span>() <span class="op">+=</span> <span class="number">10</span>;
}
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">map</span>[<span class="string">"poneyland"</span>], <span class="number">22</span>);<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0Afn%20main()%20%7B%0Ause%20std%3A%3Acollections%3A%3ABTreeMap%3B%0Ause%20std%3A%3Acollections%3A%3Abtree_map%3A%3AEntry%3B%0A%0Alet%20mut%20map%3A%20BTreeMap%3C%26str%2C%20usize%3E%20%3D%20BTreeMap%3A%3Anew()%3B%0Amap.entry(%22poneyland%22).or_insert(12)%3B%0A%0Aassert_eq!(map%5B%22poneyland%22%5D%2C%2012)%3B%0Aif%20let%20Entry%3A%3AOccupied(mut%20o)%20%3D%20map.entry(%22poneyland%22)%20%7B%0A%20%20%20%20%20*o.get_mut()%20%2B%3D%2010%3B%0A%7D%0Aassert_eq!(map%5B%22poneyland%22%5D%2C%2022)%3B%0A%7D">Run</a></pre>
</div><h4 id='method.into_mut' class="method"><div class="important-traits"><div class='tooltip'>ⓘ<span class='tooltiptext'>Important traits for <a class="primitive" href="../../primitive.reference.html">&'a mut </a>I</span></div><div class="content hidden"><h3 class="important">Important traits for <a class="primitive" href="../../primitive.reference.html">&'a mut </a>I</h3><code class="content"><span class="where fmt-newline">impl<'a, I> <a class="trait" href="../../../std/iter/trait.Iterator.html" title="trait std::iter::Iterator">Iterator</a> for <a class="primitive" href="../../primitive.reference.html">&'a mut </a>I <span class="where fmt-newline">where<br> I: <a class="trait" href="../../../std/iter/trait.Iterator.html" title="trait std::iter::Iterator">Iterator</a> + ?<a class="trait" href="../../../std/marker/trait.Sized.html" title="trait std::marker::Sized">Sized</a>, </span></span><span class="where fmt-newline"> type <a href='../../../std/iter/trait.Iterator.html#associatedtype.Item' class="type">Item</a> = <I as <a class="trait" href="../../../std/iter/trait.Iterator.html" title="trait std::iter::Iterator">Iterator</a>>::<a class="type" href="../../../std/iter/trait.Iterator.html#associatedtype.Item" title="type std::iter::Iterator::Item">Item</a>;</span><span class="where fmt-newline">impl<'a, R: <a class="trait" href="../../../std/io/trait.Read.html" title="trait std::io::Read">Read</a> + ?<a class="trait" href="../../../std/marker/trait.Sized.html" title="trait std::marker::Sized">Sized</a>> <a class="trait" href="../../../std/io/trait.Read.html" title="trait std::io::Read">Read</a> for <a class="primitive" href="../../primitive.reference.html">&'a mut </a>R</span><span class="where fmt-newline">impl<'a, W: <a class="trait" href="../../../std/io/trait.Write.html" title="trait std::io::Write">Write</a> + ?<a class="trait" href="../../../std/marker/trait.Sized.html" title="trait std::marker::Sized">Sized</a>> <a class="trait" href="../../../std/io/trait.Write.html" title="trait std::io::Write">Write</a> for <a class="primitive" href="../../primitive.reference.html">&'a mut </a>W</span></code></div></div><span id='into_mut.v' class='invisible'><code>pub fn <a href='#method.into_mut' class='fnname'>into_mut</a>(self) -> <a class="primitive" href="../../primitive.reference.html">&'a mut </a>V</code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../../src/alloc/btree/map.rs.html#2370-2372' title='goto source code'>[src]</a></span></h4>
<div class='docblock'><p>Converts the entry into a mutable reference to its value.</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">collections</span>::<span class="ident">BTreeMap</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">collections</span>::<span class="ident">btree_map</span>::<span class="ident">Entry</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">map</span>: <span class="ident">BTreeMap</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">str</span>, <span class="ident">usize</span><span class="op">></span> <span class="op">=</span> <span class="ident">BTreeMap</span>::<span class="ident">new</span>();
<span class="ident">map</span>.<span class="ident">entry</span>(<span class="string">"poneyland"</span>).<span class="ident">or_insert</span>(<span class="number">12</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">map</span>[<span class="string">"poneyland"</span>], <span class="number">12</span>);
<span class="kw">if</span> <span class="kw">let</span> <span class="ident">Entry</span>::<span class="ident">Occupied</span>(<span class="ident">o</span>) <span class="op">=</span> <span class="ident">map</span>.<span class="ident">entry</span>(<span class="string">"poneyland"</span>) {
<span class="kw-2">*</span><span class="ident">o</span>.<span class="ident">into_mut</span>() <span class="op">+=</span> <span class="number">10</span>;
}
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">map</span>[<span class="string">"poneyland"</span>], <span class="number">22</span>);<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0Afn%20main()%20%7B%0Ause%20std%3A%3Acollections%3A%3ABTreeMap%3B%0Ause%20std%3A%3Acollections%3A%3Abtree_map%3A%3AEntry%3B%0A%0Alet%20mut%20map%3A%20BTreeMap%3C%26str%2C%20usize%3E%20%3D%20BTreeMap%3A%3Anew()%3B%0Amap.entry(%22poneyland%22).or_insert(12)%3B%0A%0Aassert_eq!(map%5B%22poneyland%22%5D%2C%2012)%3B%0Aif%20let%20Entry%3A%3AOccupied(o)%20%3D%20map.entry(%22poneyland%22)%20%7B%0A%20%20%20%20*o.into_mut()%20%2B%3D%2010%3B%0A%7D%0Aassert_eq!(map%5B%22poneyland%22%5D%2C%2022)%3B%0A%7D">Run</a></pre>
</div><h4 id='method.insert' class="method"><span id='insert.v' class='invisible'><code>pub fn <a href='#method.insert' class='fnname'>insert</a>(&mut self, value: V) -> V</code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../../src/alloc/btree/map.rs.html#2392-2394' title='goto source code'>[src]</a></span></h4>
<div class='docblock'><p>Sets the value of the entry with the <code>OccupiedEntry</code>'s key,
and returns the entry's old value.</p>
<h1 id="examples-5" class="section-header"><a href="#examples-5">Examples</a></h1>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">collections</span>::<span class="ident">BTreeMap</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">collections</span>::<span class="ident">btree_map</span>::<span class="ident">Entry</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">map</span>: <span class="ident">BTreeMap</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">str</span>, <span class="ident">usize</span><span class="op">></span> <span class="op">=</span> <span class="ident">BTreeMap</span>::<span class="ident">new</span>();
<span class="ident">map</span>.<span class="ident">entry</span>(<span class="string">"poneyland"</span>).<span class="ident">or_insert</span>(<span class="number">12</span>);
<span class="kw">if</span> <span class="kw">let</span> <span class="ident">Entry</span>::<span class="ident">Occupied</span>(<span class="kw-2">mut</span> <span class="ident">o</span>) <span class="op">=</span> <span class="ident">map</span>.<span class="ident">entry</span>(<span class="string">"poneyland"</span>) {
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">o</span>.<span class="ident">insert</span>(<span class="number">15</span>), <span class="number">12</span>);
}
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">map</span>[<span class="string">"poneyland"</span>], <span class="number">15</span>);<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0Afn%20main()%20%7B%0Ause%20std%3A%3Acollections%3A%3ABTreeMap%3B%0Ause%20std%3A%3Acollections%3A%3Abtree_map%3A%3AEntry%3B%0A%0Alet%20mut%20map%3A%20BTreeMap%3C%26str%2C%20usize%3E%20%3D%20BTreeMap%3A%3Anew()%3B%0Amap.entry(%22poneyland%22).or_insert(12)%3B%0A%0Aif%20let%20Entry%3A%3AOccupied(mut%20o)%20%3D%20map.entry(%22poneyland%22)%20%7B%0A%20%20%20%20assert_eq!(o.insert(15)%2C%2012)%3B%0A%7D%0Aassert_eq!(map%5B%22poneyland%22%5D%2C%2015)%3B%0A%7D">Run</a></pre>
</div><h4 id='method.remove' class="method"><span id='remove.v' class='invisible'><code>pub fn <a href='#method.remove' class='fnname'>remove</a>(self) -> V</code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../../src/alloc/btree/map.rs.html#2414-2416' title='goto source code'>[src]</a></span></h4>
<div class='docblock'><p>Takes the value of the entry out of the map, and returns it.</p>
<h1 id="examples-6" class="section-header"><a href="#examples-6">Examples</a></h1>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">collections</span>::<span class="ident">BTreeMap</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">collections</span>::<span class="ident">btree_map</span>::<span class="ident">Entry</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">map</span>: <span class="ident">BTreeMap</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">str</span>, <span class="ident">usize</span><span class="op">></span> <span class="op">=</span> <span class="ident">BTreeMap</span>::<span class="ident">new</span>();
<span class="ident">map</span>.<span class="ident">entry</span>(<span class="string">"poneyland"</span>).<span class="ident">or_insert</span>(<span class="number">12</span>);
<span class="kw">if</span> <span class="kw">let</span> <span class="ident">Entry</span>::<span class="ident">Occupied</span>(<span class="ident">o</span>) <span class="op">=</span> <span class="ident">map</span>.<span class="ident">entry</span>(<span class="string">"poneyland"</span>) {
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">o</span>.<span class="ident">remove</span>(), <span class="number">12</span>);
}
<span class="comment">// If we try to get "poneyland"'s value, it'll panic:</span>
<span class="comment">// println!("{}", map["poneyland"]);</span><a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0Afn%20main()%20%7B%0Ause%20std%3A%3Acollections%3A%3ABTreeMap%3B%0Ause%20std%3A%3Acollections%3A%3Abtree_map%3A%3AEntry%3B%0A%0Alet%20mut%20map%3A%20BTreeMap%3C%26str%2C%20usize%3E%20%3D%20BTreeMap%3A%3Anew()%3B%0Amap.entry(%22poneyland%22).or_insert(12)%3B%0A%0Aif%20let%20Entry%3A%3AOccupied(o)%20%3D%20map.entry(%22poneyland%22)%20%7B%0A%20%20%20%20assert_eq!(o.remove()%2C%2012)%3B%0A%7D%0A%2F%2F%20If%20we%20try%20to%20get%20%22poneyland%22's%20value%2C%20it'll%20panic%3A%0A%2F%2F%20println!(%22%7B%7D%22%2C%20map%5B%22poneyland%22%5D)%3B%0A%7D">Run</a></pre>
</div></div>
<h2 id='implementations' class='small-section-header'>
Trait Implementations<a href='#implementations' class='anchor'></a>
</h2>
<h3 id='impl-Debug' class='impl'><span class='in-band'><code>impl<'a, K, V> <a class="trait" href="../../../std/fmt/trait.Debug.html" title="trait std::fmt::Debug">Debug</a> for <a class="struct" href="../../../std/collections/btree_map/struct.OccupiedEntry.html" title="struct std::collections::btree_map::OccupiedEntry">OccupiedEntry</a><'a, K, V> <span class="where fmt-newline">where<br> K: 'a + <a class="trait" href="../../../std/cmp/trait.Ord.html" title="trait std::cmp::Ord">Ord</a> + <a class="trait" href="../../../std/fmt/trait.Debug.html" title="trait std::fmt::Debug">Debug</a>,<br> V: 'a + <a class="trait" href="../../../std/fmt/trait.Debug.html" title="trait std::fmt::Debug">Debug</a>, </span></code><a href='#impl-Debug' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><div class='since' title='Stable since Rust version 1.12.0'>1.12.0</div><a class='srclink' href='../../../src/alloc/btree/map.rs.html#493-500' title='goto source code'>[src]</a></span></h3>
<div class='impl-items'><h4 id='method.fmt' class="method"><span id='fmt.v' class='invisible'><code>fn <a href='../../../std/fmt/trait.Debug.html#tymethod.fmt' class='fnname'>fmt</a>(&self, f: &mut <a class="struct" href="../../../std/fmt/struct.Formatter.html" title="struct std::fmt::Formatter">Formatter</a>) -> <a class="enum" href="../../../std/result/enum.Result.html" title="enum std::result::Result">Result</a><<a class="primitive" href="../../primitive.unit.html">()</a>, <a class="struct" href="../../../std/fmt/struct.Error.html" title="struct std::fmt::Error">Error</a>></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../../src/alloc/btree/map.rs.html#494-499' title='goto source code'>[src]</a></span></h4>
<div class='docblock'><p>Formats the value using the given formatter. <a href="../../../std/fmt/trait.Debug.html#tymethod.fmt">Read more</a></p>
</div></div></section>
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