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<p class='location'>Struct BTreeSet</p><div class="block items"><ul><li><a href="#methods">Methods</a></li><li><a href="#implementations">Trait Implementations</a></li></ul></div><p class='location'><a href='../index.html'>collections</a>::<wbr><a href='index.html'>btree_set</a></p><script>window.sidebarCurrent = {name: 'BTreeSet', ty: 'struct', relpath: ''};</script><script defer src="sidebar-items.js"></script>
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<h1 class='fqn'><span class='in-band'>Struct <a href='../index.html'>collections</a>::<wbr><a href='index.html'>btree_set</a>::<wbr><a class="struct" href=''>BTreeSet</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/collections/btree/set.rs.html#73-75' title='goto source code'>[src]</a></span></h1>
<pre class='rust struct'>pub struct BTreeSet<T> { /* fields omitted */ }</pre><div class='docblock'><p>A set based on a B-Tree.</p>
<p>See <a href="struct.BTreeMap.html"><code>BTreeMap</code></a>'s documentation for a detailed discussion of this collection's performance
benefits and drawbacks.</p>
<p>It is a logic error for an item to be modified in such a way that the item's ordering relative
to any other item, as determined by the <a href="../../std/cmp/trait.Ord.html"><code>Ord</code></a> trait, changes while it is in the set. This is
normally only possible through <a href="../../std/cell/struct.Cell.html"><code>Cell</code></a>, <a href="../../std/cell/struct.RefCell.html"><code>RefCell</code></a>, global state, I/O, or unsafe code.</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">BTreeSet</span>;
<span class="comment">// Type inference lets us omit an explicit type signature (which</span>
<span class="comment">// would be `BTreeSet<&str>` in this example).</span>
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">books</span> <span class="op">=</span> <span class="ident">BTreeSet</span>::<span class="ident">new</span>();
<span class="comment">// Add some books.</span>
<span class="ident">books</span>.<span class="ident">insert</span>(<span class="string">"A Dance With Dragons"</span>);
<span class="ident">books</span>.<span class="ident">insert</span>(<span class="string">"To Kill a Mockingbird"</span>);
<span class="ident">books</span>.<span class="ident">insert</span>(<span class="string">"The Odyssey"</span>);
<span class="ident">books</span>.<span class="ident">insert</span>(<span class="string">"The Great Gatsby"</span>);
<span class="comment">// Check for a specific one.</span>
<span class="kw">if</span> <span class="op">!</span><span class="ident">books</span>.<span class="ident">contains</span>(<span class="string">"The Winds of Winter"</span>) {
<span class="macro">println</span><span class="macro">!</span>(<span class="string">"We have {} books, but The Winds of Winter ain't one."</span>,
<span class="ident">books</span>.<span class="ident">len</span>());
}
<span class="comment">// Remove a book.</span>
<span class="ident">books</span>.<span class="ident">remove</span>(<span class="string">"The Odyssey"</span>);
<span class="comment">// Iterate over everything.</span>
<span class="kw">for</span> <span class="ident">book</span> <span class="kw">in</span> <span class="kw-2">&</span><span class="ident">books</span> {
<span class="macro">println</span><span class="macro">!</span>(<span class="string">"{}"</span>, <span class="ident">book</span>);
}<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=extern%20crate%20collections%3B%0Afn%20main()%20%7B%0Ause%20std%3A%3Acollections%3A%3ABTreeSet%3B%0A%0A%2F%2F%20Type%20inference%20lets%20us%20omit%20an%20explicit%20type%20signature%20(which%0A%2F%2F%20would%20be%20%60BTreeSet%3C%26str%3E%60%20in%20this%20example).%0Alet%20mut%20books%20%3D%20BTreeSet%3A%3Anew()%3B%0A%0A%2F%2F%20Add%20some%20books.%0Abooks.insert(%22A%20Dance%20With%20Dragons%22)%3B%0Abooks.insert(%22To%20Kill%20a%20Mockingbird%22)%3B%0Abooks.insert(%22The%20Odyssey%22)%3B%0Abooks.insert(%22The%20Great%20Gatsby%22)%3B%0A%0A%2F%2F%20Check%20for%20a%20specific%20one.%0Aif%20!books.contains(%22The%20Winds%20of%20Winter%22)%20%7B%0A%20%20%20%20println!(%22We%20have%20%7B%7D%20books%2C%20but%20The%20Winds%20of%20Winter%20ain't%20one.%22%2C%0A%20%20%20%20%20%20%20%20%20%20%20%20%20books.len())%3B%0A%7D%0A%0A%2F%2F%20Remove%20a%20book.%0Abooks.remove(%22The%20Odyssey%22)%3B%0A%0A%2F%2F%20Iterate%20over%20everything.%0Afor%20book%20in%20%26books%20%7B%0A%20%20%20%20println!(%22%7B%7D%22%2C%20book)%3B%0A%7D%0A%7D">Run</a></pre>
</div><h2 id='methods'>Methods</h2><h3 class='impl'><span class='in-band'><code>impl<T: <a class="trait" href="../../core/cmp/trait.Ord.html" title="trait core::cmp::Ord">Ord</a>> <a class="struct" href="../../collections/btree_set/struct.BTreeSet.html" title="struct collections::btree_set::BTreeSet">BTreeSet</a><T></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/collections/btree/set.rs.html#216-231' title='goto source code'>[src]</a></span></h3>
<div class='impl-items'><h4 id='method.new' class="method"><span id='new.v' class='invisible'><code>fn <a href='#method.new' class='fnname'>new</a>() -> <a class="struct" href="../../collections/btree_set/struct.BTreeSet.html" title="struct collections::btree_set::BTreeSet">BTreeSet</a><T></code></span></h4>
<div class='docblock'><p>Makes a new <code>BTreeSet</code> with a reasonable choice of B.</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">BTreeSet</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">set</span>: <span class="ident">BTreeSet</span><span class="op"><</span><span class="ident">i32</span><span class="op">></span> <span class="op">=</span> <span class="ident">BTreeSet</span>::<span class="ident">new</span>();<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused_mut)%5D%0Aextern%20crate%20collections%3B%0Afn%20main()%20%7B%0Ause%20std%3A%3Acollections%3A%3ABTreeSet%3B%0A%0Alet%20mut%20set%3A%20BTreeSet%3Ci32%3E%20%3D%20BTreeSet%3A%3Anew()%3B%0A%7D">Run</a></pre>
</div></div><h3 class='impl'><span class='in-band'><code>impl<T> <a class="struct" href="../../collections/btree_set/struct.BTreeSet.html" title="struct collections::btree_set::BTreeSet">BTreeSet</a><T></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/collections/btree/set.rs.html#233-265' title='goto source code'>[src]</a></span></h3>
<div class='impl-items'><h4 id='method.iter' class="method"><span id='iter.v' class='invisible'><code>fn <a href='#method.iter' class='fnname'>iter</a>(&self) -> <a class="struct" href="../../collections/btree_set/struct.Iter.html" title="struct collections::btree_set::Iter">Iter</a><T></code></span></h4>
<div class='docblock'><p>Gets an iterator that visits the values in the <code>BTreeSet</code> in ascending order.</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">BTreeSet</span>;
<span class="kw">let</span> <span class="ident">set</span>: <span class="ident">BTreeSet</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> <span class="op">=</span> [<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>].<span class="ident">iter</span>().<span class="ident">cloned</span>().<span class="ident">collect</span>();
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">set_iter</span> <span class="op">=</span> <span class="ident">set</span>.<span class="ident">iter</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">set_iter</span>.<span class="ident">next</span>(), <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="number">1</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">set_iter</span>.<span class="ident">next</span>(), <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="number">2</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">set_iter</span>.<span class="ident">next</span>(), <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="number">3</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">set_iter</span>.<span class="ident">next</span>(), <span class="prelude-val">None</span>);<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=extern%20crate%20collections%3B%0Afn%20main()%20%7B%0Ause%20std%3A%3Acollections%3A%3ABTreeSet%3B%0A%0Alet%20set%3A%20BTreeSet%3Cusize%3E%20%3D%20%5B1%2C%202%2C%203%5D.iter().cloned().collect()%3B%0Alet%20mut%20set_iter%20%3D%20set.iter()%3B%0Aassert_eq!(set_iter.next()%2C%20Some(%261))%3B%0Aassert_eq!(set_iter.next()%2C%20Some(%262))%3B%0Aassert_eq!(set_iter.next()%2C%20Some(%263))%3B%0Aassert_eq!(set_iter.next()%2C%20None)%3B%0A%7D">Run</a></pre>
<p>Values returned by the iterator are returned in ascending order:</p>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">collections</span>::<span class="ident">BTreeSet</span>;
<span class="kw">let</span> <span class="ident">set</span>: <span class="ident">BTreeSet</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> <span class="op">=</span> [<span class="number">3</span>, <span class="number">1</span>, <span class="number">2</span>].<span class="ident">iter</span>().<span class="ident">cloned</span>().<span class="ident">collect</span>();
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">set_iter</span> <span class="op">=</span> <span class="ident">set</span>.<span class="ident">iter</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">set_iter</span>.<span class="ident">next</span>(), <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="number">1</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">set_iter</span>.<span class="ident">next</span>(), <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="number">2</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">set_iter</span>.<span class="ident">next</span>(), <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="number">3</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">set_iter</span>.<span class="ident">next</span>(), <span class="prelude-val">None</span>);<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=extern%20crate%20collections%3B%0Afn%20main()%20%7B%0Ause%20std%3A%3Acollections%3A%3ABTreeSet%3B%0A%0Alet%20set%3A%20BTreeSet%3Cusize%3E%20%3D%20%5B3%2C%201%2C%202%5D.iter().cloned().collect()%3B%0Alet%20mut%20set_iter%20%3D%20set.iter()%3B%0Aassert_eq!(set_iter.next()%2C%20Some(%261))%3B%0Aassert_eq!(set_iter.next()%2C%20Some(%262))%3B%0Aassert_eq!(set_iter.next()%2C%20Some(%263))%3B%0Aassert_eq!(set_iter.next()%2C%20None)%3B%0A%7D">Run</a></pre>
</div></div><h3 class='impl'><span class='in-band'><code>impl<T: <a class="trait" href="../../core/cmp/trait.Ord.html" title="trait core::cmp::Ord">Ord</a>> <a class="struct" href="../../collections/btree_set/struct.BTreeSet.html" title="struct collections::btree_set::BTreeSet">BTreeSet</a><T></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/collections/btree/set.rs.html#267-296' title='goto source code'>[src]</a></span></h3>
<div class='impl-items'><h4 id='method.range' class="method"><span id='range.v' class='invisible'><code>fn <a href='#method.range' class='fnname'>range</a><K: ?<a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>, R>(&self, range: R) -> <a class="struct" href="../../collections/btree_set/struct.Range.html" title="struct collections::btree_set::Range">Range</a><T> <span class="where fmt-newline">where<br> K: <a class="trait" href="../../core/cmp/trait.Ord.html" title="trait core::cmp::Ord">Ord</a>,<br> T: <a class="trait" href="../../collections/borrow/trait.Borrow.html" title="trait collections::borrow::Borrow">Borrow</a><K>,<br> R: <a class="trait" href="../../collections/range/trait.RangeArgument.html" title="trait collections::range::RangeArgument">RangeArgument</a><K>, </span></code><div class='since' title='Stable since Rust version 1.17.0'>1.17.0</div></span></h4>
<div class='docblock'><p>Constructs a double-ended iterator over a sub-range of elements in the set.
The simplest way is to use the range syntax <code>min..max</code>, thus <code>range(min..max)</code> will
yield elements from min (inclusive) to max (exclusive).
The range may also be entered as <code>(Bound<T>, Bound<T>)</code>, so for example
<code>range((Excluded(4), Included(10)))</code> will yield a left-exclusive, right-inclusive
range from 4 to 10.</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">BTreeSet</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">collections</span>::<span class="ident">Bound</span>::<span class="ident">Included</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">set</span> <span class="op">=</span> <span class="ident">BTreeSet</span>::<span class="ident">new</span>();
<span class="ident">set</span>.<span class="ident">insert</span>(<span class="number">3</span>);
<span class="ident">set</span>.<span class="ident">insert</span>(<span class="number">5</span>);
<span class="ident">set</span>.<span class="ident">insert</span>(<span class="number">8</span>);
<span class="kw">for</span> <span class="kw-2">&</span><span class="ident">elem</span> <span class="kw">in</span> <span class="ident">set</span>.<span class="ident">range</span>((<span class="ident">Included</span>(<span class="kw-2">&</span><span class="number">4</span>), <span class="ident">Included</span>(<span class="kw-2">&</span><span class="number">8</span>))) {
<span class="macro">println</span><span class="macro">!</span>(<span class="string">"{}"</span>, <span class="ident">elem</span>);
}
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="number">5</span>), <span class="ident">set</span>.<span class="ident">range</span>(<span class="number">4</span>..).<span class="ident">next</span>());<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=extern%20crate%20collections%3B%0Afn%20main()%20%7B%0Ause%20std%3A%3Acollections%3A%3ABTreeSet%3B%0Ause%20std%3A%3Acollections%3A%3ABound%3A%3AIncluded%3B%0A%0Alet%20mut%20set%20%3D%20BTreeSet%3A%3Anew()%3B%0Aset.insert(3)%3B%0Aset.insert(5)%3B%0Aset.insert(8)%3B%0Afor%20%26elem%20in%20set.range((Included(%264)%2C%20Included(%268)))%20%7B%0A%20%20%20%20println!(%22%7B%7D%22%2C%20elem)%3B%0A%7D%0Aassert_eq!(Some(%265)%2C%20set.range(4..).next())%3B%0A%7D">Run</a></pre>
</div></div><h3 class='impl'><span class='in-band'><code>impl<T: <a class="trait" href="../../core/cmp/trait.Ord.html" title="trait core::cmp::Ord">Ord</a>> <a class="struct" href="../../collections/btree_set/struct.BTreeSet.html" title="struct collections::btree_set::BTreeSet">BTreeSet</a><T></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/collections/btree/set.rs.html#298-725' title='goto source code'>[src]</a></span></h3>
<div class='impl-items'><h4 id='method.difference' class="method"><span id='difference.v' class='invisible'><code>fn <a href='#method.difference' class='fnname'>difference</a><'a>(&'a self, other: &'a <a class="struct" href="../../collections/btree_set/struct.BTreeSet.html" title="struct collections::btree_set::BTreeSet">BTreeSet</a><T>) -> <a class="struct" href="../../collections/btree_set/struct.Difference.html" title="struct collections::btree_set::Difference">Difference</a><'a, T></code></span></h4>
<div class='docblock'><p>Visits the values representing the difference,
i.e. the values that are in <code>self</code> but not in <code>other</code>,
in ascending order.</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">BTreeSet</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">a</span> <span class="op">=</span> <span class="ident">BTreeSet</span>::<span class="ident">new</span>();
<span class="ident">a</span>.<span class="ident">insert</span>(<span class="number">1</span>);
<span class="ident">a</span>.<span class="ident">insert</span>(<span class="number">2</span>);
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">b</span> <span class="op">=</span> <span class="ident">BTreeSet</span>::<span class="ident">new</span>();
<span class="ident">b</span>.<span class="ident">insert</span>(<span class="number">2</span>);
<span class="ident">b</span>.<span class="ident">insert</span>(<span class="number">3</span>);
<span class="kw">let</span> <span class="ident">diff</span>: <span class="ident">Vec</span><span class="op"><</span>_<span class="op">></span> <span class="op">=</span> <span class="ident">a</span>.<span class="ident">difference</span>(<span class="kw-2">&</span><span class="ident">b</span>).<span class="ident">cloned</span>().<span class="ident">collect</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">diff</span>, [<span class="number">1</span>]);<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=extern%20crate%20collections%3B%0Afn%20main()%20%7B%0Ause%20std%3A%3Acollections%3A%3ABTreeSet%3B%0A%0Alet%20mut%20a%20%3D%20BTreeSet%3A%3Anew()%3B%0Aa.insert(1)%3B%0Aa.insert(2)%3B%0A%0Alet%20mut%20b%20%3D%20BTreeSet%3A%3Anew()%3B%0Ab.insert(2)%3B%0Ab.insert(3)%3B%0A%0Alet%20diff%3A%20Vec%3C_%3E%20%3D%20a.difference(%26b).cloned().collect()%3B%0Aassert_eq!(diff%2C%20%5B1%5D)%3B%0A%7D">Run</a></pre>
</div><h4 id='method.symmetric_difference' class="method"><span id='symmetric_difference.v' class='invisible'><code>fn <a href='#method.symmetric_difference' class='fnname'>symmetric_difference</a><'a>(<br> &'a self, <br> other: &'a <a class="struct" href="../../collections/btree_set/struct.BTreeSet.html" title="struct collections::btree_set::BTreeSet">BTreeSet</a><T><br>) -> <a class="struct" href="../../collections/btree_set/struct.SymmetricDifference.html" title="struct collections::btree_set::SymmetricDifference">SymmetricDifference</a><'a, T></code></span></h4>
<div class='docblock'><p>Visits the values representing the symmetric difference,
i.e. the values that are in <code>self</code> or in <code>other</code> but not in both,
in ascending order.</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">BTreeSet</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">a</span> <span class="op">=</span> <span class="ident">BTreeSet</span>::<span class="ident">new</span>();
<span class="ident">a</span>.<span class="ident">insert</span>(<span class="number">1</span>);
<span class="ident">a</span>.<span class="ident">insert</span>(<span class="number">2</span>);
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">b</span> <span class="op">=</span> <span class="ident">BTreeSet</span>::<span class="ident">new</span>();
<span class="ident">b</span>.<span class="ident">insert</span>(<span class="number">2</span>);
<span class="ident">b</span>.<span class="ident">insert</span>(<span class="number">3</span>);
<span class="kw">let</span> <span class="ident">sym_diff</span>: <span class="ident">Vec</span><span class="op"><</span>_<span class="op">></span> <span class="op">=</span> <span class="ident">a</span>.<span class="ident">symmetric_difference</span>(<span class="kw-2">&</span><span class="ident">b</span>).<span class="ident">cloned</span>().<span class="ident">collect</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">sym_diff</span>, [<span class="number">1</span>, <span class="number">3</span>]);<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=extern%20crate%20collections%3B%0Afn%20main()%20%7B%0Ause%20std%3A%3Acollections%3A%3ABTreeSet%3B%0A%0Alet%20mut%20a%20%3D%20BTreeSet%3A%3Anew()%3B%0Aa.insert(1)%3B%0Aa.insert(2)%3B%0A%0Alet%20mut%20b%20%3D%20BTreeSet%3A%3Anew()%3B%0Ab.insert(2)%3B%0Ab.insert(3)%3B%0A%0Alet%20sym_diff%3A%20Vec%3C_%3E%20%3D%20a.symmetric_difference(%26b).cloned().collect()%3B%0Aassert_eq!(sym_diff%2C%20%5B1%2C%203%5D)%3B%0A%7D">Run</a></pre>
</div><h4 id='method.intersection' class="method"><span id='intersection.v' class='invisible'><code>fn <a href='#method.intersection' class='fnname'>intersection</a><'a>(&'a self, other: &'a <a class="struct" href="../../collections/btree_set/struct.BTreeSet.html" title="struct collections::btree_set::BTreeSet">BTreeSet</a><T>) -> <a class="struct" href="../../collections/btree_set/struct.Intersection.html" title="struct collections::btree_set::Intersection">Intersection</a><'a, T></code></span></h4>
<div class='docblock'><p>Visits the values representing the intersection,
i.e. the values that are both in <code>self</code> and <code>other</code>,
in ascending order.</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">BTreeSet</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">a</span> <span class="op">=</span> <span class="ident">BTreeSet</span>::<span class="ident">new</span>();
<span class="ident">a</span>.<span class="ident">insert</span>(<span class="number">1</span>);
<span class="ident">a</span>.<span class="ident">insert</span>(<span class="number">2</span>);
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">b</span> <span class="op">=</span> <span class="ident">BTreeSet</span>::<span class="ident">new</span>();
<span class="ident">b</span>.<span class="ident">insert</span>(<span class="number">2</span>);
<span class="ident">b</span>.<span class="ident">insert</span>(<span class="number">3</span>);
<span class="kw">let</span> <span class="ident">intersection</span>: <span class="ident">Vec</span><span class="op"><</span>_<span class="op">></span> <span class="op">=</span> <span class="ident">a</span>.<span class="ident">intersection</span>(<span class="kw-2">&</span><span class="ident">b</span>).<span class="ident">cloned</span>().<span class="ident">collect</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">intersection</span>, [<span class="number">2</span>]);<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=extern%20crate%20collections%3B%0Afn%20main()%20%7B%0Ause%20std%3A%3Acollections%3A%3ABTreeSet%3B%0A%0Alet%20mut%20a%20%3D%20BTreeSet%3A%3Anew()%3B%0Aa.insert(1)%3B%0Aa.insert(2)%3B%0A%0Alet%20mut%20b%20%3D%20BTreeSet%3A%3Anew()%3B%0Ab.insert(2)%3B%0Ab.insert(3)%3B%0A%0Alet%20intersection%3A%20Vec%3C_%3E%20%3D%20a.intersection(%26b).cloned().collect()%3B%0Aassert_eq!(intersection%2C%20%5B2%5D)%3B%0A%7D">Run</a></pre>
</div><h4 id='method.union' class="method"><span id='union.v' class='invisible'><code>fn <a href='#method.union' class='fnname'>union</a><'a>(&'a self, other: &'a <a class="struct" href="../../collections/btree_set/struct.BTreeSet.html" title="struct collections::btree_set::BTreeSet">BTreeSet</a><T>) -> <a class="struct" href="../../collections/btree_set/struct.Union.html" title="struct collections::btree_set::Union">Union</a><'a, T></code></span></h4>
<div class='docblock'><p>Visits the values representing the union,
i.e. all the values in <code>self</code> or <code>other</code>, without duplicates,
in ascending order.</p>
<h1 id='examples-7' class='section-header'><a href='#examples-7'>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">BTreeSet</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">a</span> <span class="op">=</span> <span class="ident">BTreeSet</span>::<span class="ident">new</span>();
<span class="ident">a</span>.<span class="ident">insert</span>(<span class="number">1</span>);
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">b</span> <span class="op">=</span> <span class="ident">BTreeSet</span>::<span class="ident">new</span>();
<span class="ident">b</span>.<span class="ident">insert</span>(<span class="number">2</span>);
<span class="kw">let</span> <span class="ident">union</span>: <span class="ident">Vec</span><span class="op"><</span>_<span class="op">></span> <span class="op">=</span> <span class="ident">a</span>.<span class="ident">union</span>(<span class="kw-2">&</span><span class="ident">b</span>).<span class="ident">cloned</span>().<span class="ident">collect</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">union</span>, [<span class="number">1</span>, <span class="number">2</span>]);<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=extern%20crate%20collections%3B%0Afn%20main()%20%7B%0Ause%20std%3A%3Acollections%3A%3ABTreeSet%3B%0A%0Alet%20mut%20a%20%3D%20BTreeSet%3A%3Anew()%3B%0Aa.insert(1)%3B%0A%0Alet%20mut%20b%20%3D%20BTreeSet%3A%3Anew()%3B%0Ab.insert(2)%3B%0A%0Alet%20union%3A%20Vec%3C_%3E%20%3D%20a.union(%26b).cloned().collect()%3B%0Aassert_eq!(union%2C%20%5B1%2C%202%5D)%3B%0A%7D">Run</a></pre>
</div><h4 id='method.len' class="method"><span id='len.v' class='invisible'><code>fn <a href='#method.len' class='fnname'>len</a>(&self) -> usize</code></span></h4>
<div class='docblock'><p>Returns the number of elements in the set.</p>
<h1 id='examples-8' class='section-header'><a href='#examples-8'>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">BTreeSet</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">v</span> <span class="op">=</span> <span class="ident">BTreeSet</span>::<span class="ident">new</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>.<span class="ident">len</span>(), <span class="number">0</span>);
<span class="ident">v</span>.<span class="ident">insert</span>(<span class="number">1</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>.<span class="ident">len</span>(), <span class="number">1</span>);<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=extern%20crate%20collections%3B%0Afn%20main()%20%7B%0Ause%20std%3A%3Acollections%3A%3ABTreeSet%3B%0A%0Alet%20mut%20v%20%3D%20BTreeSet%3A%3Anew()%3B%0Aassert_eq!(v.len()%2C%200)%3B%0Av.insert(1)%3B%0Aassert_eq!(v.len()%2C%201)%3B%0A%7D">Run</a></pre>
</div><h4 id='method.is_empty' class="method"><span id='is_empty.v' class='invisible'><code>fn <a href='#method.is_empty' class='fnname'>is_empty</a>(&self) -> bool</code></span></h4>
<div class='docblock'><p>Returns <code>true</code> if the set contains no elements.</p>
<h1 id='examples-9' class='section-header'><a href='#examples-9'>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">BTreeSet</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">v</span> <span class="op">=</span> <span class="ident">BTreeSet</span>::<span class="ident">new</span>();
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">v</span>.<span class="ident">is_empty</span>());
<span class="ident">v</span>.<span class="ident">insert</span>(<span class="number">1</span>);
<span class="macro">assert</span><span class="macro">!</span>(<span class="op">!</span><span class="ident">v</span>.<span class="ident">is_empty</span>());<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=extern%20crate%20collections%3B%0Afn%20main()%20%7B%0Ause%20std%3A%3Acollections%3A%3ABTreeSet%3B%0A%0Alet%20mut%20v%20%3D%20BTreeSet%3A%3Anew()%3B%0Aassert!(v.is_empty())%3B%0Av.insert(1)%3B%0Aassert!(!v.is_empty())%3B%0A%7D">Run</a></pre>
</div><h4 id='method.clear' class="method"><span id='clear.v' class='invisible'><code>fn <a href='#method.clear' class='fnname'>clear</a>(&mut self)</code></span></h4>
<div class='docblock'><p>Clears the set, removing all values.</p>
<h1 id='examples-10' class='section-header'><a href='#examples-10'>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">BTreeSet</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">v</span> <span class="op">=</span> <span class="ident">BTreeSet</span>::<span class="ident">new</span>();
<span class="ident">v</span>.<span class="ident">insert</span>(<span class="number">1</span>);
<span class="ident">v</span>.<span class="ident">clear</span>();
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">v</span>.<span class="ident">is_empty</span>());<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=extern%20crate%20collections%3B%0Afn%20main()%20%7B%0Ause%20std%3A%3Acollections%3A%3ABTreeSet%3B%0A%0Alet%20mut%20v%20%3D%20BTreeSet%3A%3Anew()%3B%0Av.insert(1)%3B%0Av.clear()%3B%0Aassert!(v.is_empty())%3B%0A%7D">Run</a></pre>
</div><h4 id='method.contains' class="method"><span id='contains.v' class='invisible'><code>fn <a href='#method.contains' class='fnname'>contains</a><Q: ?<a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>>(&self, value: &Q) -> bool <span class="where fmt-newline">where<br> T: <a class="trait" href="../../collections/borrow/trait.Borrow.html" title="trait collections::borrow::Borrow">Borrow</a><Q>,<br> Q: <a class="trait" href="../../core/cmp/trait.Ord.html" title="trait core::cmp::Ord">Ord</a>, </span></code></span></h4>
<div class='docblock'><p>Returns <code>true</code> if the set contains a value.</p>
<p>The value may be any borrowed form of the set's value type,
but the ordering on the borrowed form <em>must</em> match the
ordering on the value type.</p>
<h1 id='examples-11' class='section-header'><a href='#examples-11'>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">BTreeSet</span>;
<span class="kw">let</span> <span class="ident">set</span>: <span class="ident">BTreeSet</span><span class="op"><</span>_<span class="op">></span> <span class="op">=</span> [<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>].<span class="ident">iter</span>().<span class="ident">cloned</span>().<span class="ident">collect</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">set</span>.<span class="ident">contains</span>(<span class="kw-2">&</span><span class="number">1</span>), <span class="bool-val">true</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">set</span>.<span class="ident">contains</span>(<span class="kw-2">&</span><span class="number">4</span>), <span class="bool-val">false</span>);<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=extern%20crate%20collections%3B%0Afn%20main()%20%7B%0Ause%20std%3A%3Acollections%3A%3ABTreeSet%3B%0A%0Alet%20set%3A%20BTreeSet%3C_%3E%20%3D%20%5B1%2C%202%2C%203%5D.iter().cloned().collect()%3B%0Aassert_eq!(set.contains(%261)%2C%20true)%3B%0Aassert_eq!(set.contains(%264)%2C%20false)%3B%0A%7D">Run</a></pre>
</div><h4 id='method.get' class="method"><span id='get.v' class='invisible'><code>fn <a href='#method.get' class='fnname'>get</a><Q: ?<a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>>(&self, value: &Q) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><&T> <span class="where fmt-newline">where<br> T: <a class="trait" href="../../collections/borrow/trait.Borrow.html" title="trait collections::borrow::Borrow">Borrow</a><Q>,<br> Q: <a class="trait" href="../../core/cmp/trait.Ord.html" title="trait core::cmp::Ord">Ord</a>, </span></code><div class='since' title='Stable since Rust version 1.9.0'>1.9.0</div></span></h4>
<div class='docblock'><p>Returns a reference to the value in the set, if any, that is equal to the given value.</p>
<p>The value may be any borrowed form of the set's value type,
but the ordering on the borrowed form <em>must</em> match the
ordering on the value type.</p>
</div><h4 id='method.is_disjoint' class="method"><span id='is_disjoint.v' class='invisible'><code>fn <a href='#method.is_disjoint' class='fnname'>is_disjoint</a>(&self, other: &<a class="struct" href="../../collections/btree_set/struct.BTreeSet.html" title="struct collections::btree_set::BTreeSet">BTreeSet</a><T>) -> bool</code></span></h4>
<div class='docblock'><p>Returns <code>true</code> if <code>self</code> has no elements in common with <code>other</code>.
This is equivalent to checking for an empty intersection.</p>
<h1 id='examples-12' class='section-header'><a href='#examples-12'>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">BTreeSet</span>;
<span class="kw">let</span> <span class="ident">a</span>: <span class="ident">BTreeSet</span><span class="op"><</span>_<span class="op">></span> <span class="op">=</span> [<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>].<span class="ident">iter</span>().<span class="ident">cloned</span>().<span class="ident">collect</span>();
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">b</span> <span class="op">=</span> <span class="ident">BTreeSet</span>::<span class="ident">new</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">a</span>.<span class="ident">is_disjoint</span>(<span class="kw-2">&</span><span class="ident">b</span>), <span class="bool-val">true</span>);
<span class="ident">b</span>.<span class="ident">insert</span>(<span class="number">4</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">a</span>.<span class="ident">is_disjoint</span>(<span class="kw-2">&</span><span class="ident">b</span>), <span class="bool-val">true</span>);
<span class="ident">b</span>.<span class="ident">insert</span>(<span class="number">1</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">a</span>.<span class="ident">is_disjoint</span>(<span class="kw-2">&</span><span class="ident">b</span>), <span class="bool-val">false</span>);<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=extern%20crate%20collections%3B%0Afn%20main()%20%7B%0Ause%20std%3A%3Acollections%3A%3ABTreeSet%3B%0A%0Alet%20a%3A%20BTreeSet%3C_%3E%20%3D%20%5B1%2C%202%2C%203%5D.iter().cloned().collect()%3B%0Alet%20mut%20b%20%3D%20BTreeSet%3A%3Anew()%3B%0A%0Aassert_eq!(a.is_disjoint(%26b)%2C%20true)%3B%0Ab.insert(4)%3B%0Aassert_eq!(a.is_disjoint(%26b)%2C%20true)%3B%0Ab.insert(1)%3B%0Aassert_eq!(a.is_disjoint(%26b)%2C%20false)%3B%0A%7D">Run</a></pre>
</div><h4 id='method.is_subset' class="method"><span id='is_subset.v' class='invisible'><code>fn <a href='#method.is_subset' class='fnname'>is_subset</a>(&self, other: &<a class="struct" href="../../collections/btree_set/struct.BTreeSet.html" title="struct collections::btree_set::BTreeSet">BTreeSet</a><T>) -> bool</code></span></h4>
<div class='docblock'><p>Returns <code>true</code> if the set is a subset of another,
i.e. <code>other</code> contains at least all the values in <code>self</code>.</p>
<h1 id='examples-13' class='section-header'><a href='#examples-13'>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">BTreeSet</span>;
<span class="kw">let</span> <span class="ident">sup</span>: <span class="ident">BTreeSet</span><span class="op"><</span>_<span class="op">></span> <span class="op">=</span> [<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>].<span class="ident">iter</span>().<span class="ident">cloned</span>().<span class="ident">collect</span>();
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">set</span> <span class="op">=</span> <span class="ident">BTreeSet</span>::<span class="ident">new</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">set</span>.<span class="ident">is_subset</span>(<span class="kw-2">&</span><span class="ident">sup</span>), <span class="bool-val">true</span>);
<span class="ident">set</span>.<span class="ident">insert</span>(<span class="number">2</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">set</span>.<span class="ident">is_subset</span>(<span class="kw-2">&</span><span class="ident">sup</span>), <span class="bool-val">true</span>);
<span class="ident">set</span>.<span class="ident">insert</span>(<span class="number">4</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">set</span>.<span class="ident">is_subset</span>(<span class="kw-2">&</span><span class="ident">sup</span>), <span class="bool-val">false</span>);<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=extern%20crate%20collections%3B%0Afn%20main()%20%7B%0Ause%20std%3A%3Acollections%3A%3ABTreeSet%3B%0A%0Alet%20sup%3A%20BTreeSet%3C_%3E%20%3D%20%5B1%2C%202%2C%203%5D.iter().cloned().collect()%3B%0Alet%20mut%20set%20%3D%20BTreeSet%3A%3Anew()%3B%0A%0Aassert_eq!(set.is_subset(%26sup)%2C%20true)%3B%0Aset.insert(2)%3B%0Aassert_eq!(set.is_subset(%26sup)%2C%20true)%3B%0Aset.insert(4)%3B%0Aassert_eq!(set.is_subset(%26sup)%2C%20false)%3B%0A%7D">Run</a></pre>
</div><h4 id='method.is_superset' class="method"><span id='is_superset.v' class='invisible'><code>fn <a href='#method.is_superset' class='fnname'>is_superset</a>(&self, other: &<a class="struct" href="../../collections/btree_set/struct.BTreeSet.html" title="struct collections::btree_set::BTreeSet">BTreeSet</a><T>) -> bool</code></span></h4>
<div class='docblock'><p>Returns <code>true</code> if the set is a superset of another,
i.e. <code>self</code> contains at least all the values in <code>other</code>.</p>
<h1 id='examples-14' class='section-header'><a href='#examples-14'>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">BTreeSet</span>;
<span class="kw">let</span> <span class="ident">sub</span>: <span class="ident">BTreeSet</span><span class="op"><</span>_<span class="op">></span> <span class="op">=</span> [<span class="number">1</span>, <span class="number">2</span>].<span class="ident">iter</span>().<span class="ident">cloned</span>().<span class="ident">collect</span>();
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">set</span> <span class="op">=</span> <span class="ident">BTreeSet</span>::<span class="ident">new</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">set</span>.<span class="ident">is_superset</span>(<span class="kw-2">&</span><span class="ident">sub</span>), <span class="bool-val">false</span>);
<span class="ident">set</span>.<span class="ident">insert</span>(<span class="number">0</span>);
<span class="ident">set</span>.<span class="ident">insert</span>(<span class="number">1</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">set</span>.<span class="ident">is_superset</span>(<span class="kw-2">&</span><span class="ident">sub</span>), <span class="bool-val">false</span>);
<span class="ident">set</span>.<span class="ident">insert</span>(<span class="number">2</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">set</span>.<span class="ident">is_superset</span>(<span class="kw-2">&</span><span class="ident">sub</span>), <span class="bool-val">true</span>);<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=extern%20crate%20collections%3B%0Afn%20main()%20%7B%0Ause%20std%3A%3Acollections%3A%3ABTreeSet%3B%0A%0Alet%20sub%3A%20BTreeSet%3C_%3E%20%3D%20%5B1%2C%202%5D.iter().cloned().collect()%3B%0Alet%20mut%20set%20%3D%20BTreeSet%3A%3Anew()%3B%0A%0Aassert_eq!(set.is_superset(%26sub)%2C%20false)%3B%0A%0Aset.insert(0)%3B%0Aset.insert(1)%3B%0Aassert_eq!(set.is_superset(%26sub)%2C%20false)%3B%0A%0Aset.insert(2)%3B%0Aassert_eq!(set.is_superset(%26sub)%2C%20true)%3B%0A%7D">Run</a></pre>
</div><h4 id='method.insert' class="method"><span id='insert.v' class='invisible'><code>fn <a href='#method.insert' class='fnname'>insert</a>(&mut self, value: T) -> bool</code></span></h4>
<div class='docblock'><p>Adds a value to the set.</p>
<p>If the set did not have this value present, <code>true</code> is returned.</p>
<p>If the set did have this value present, <code>false</code> is returned, and the
entry is not updated. See the <a href="index.html#insert-and-complex-keys">module-level documentation</a> for more.</p>
<h1 id='examples-15' class='section-header'><a href='#examples-15'>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">BTreeSet</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">set</span> <span class="op">=</span> <span class="ident">BTreeSet</span>::<span class="ident">new</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">set</span>.<span class="ident">insert</span>(<span class="number">2</span>), <span class="bool-val">true</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">set</span>.<span class="ident">insert</span>(<span class="number">2</span>), <span class="bool-val">false</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">set</span>.<span class="ident">len</span>(), <span class="number">1</span>);<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=extern%20crate%20collections%3B%0Afn%20main()%20%7B%0Ause%20std%3A%3Acollections%3A%3ABTreeSet%3B%0A%0Alet%20mut%20set%20%3D%20BTreeSet%3A%3Anew()%3B%0A%0Aassert_eq!(set.insert(2)%2C%20true)%3B%0Aassert_eq!(set.insert(2)%2C%20false)%3B%0Aassert_eq!(set.len()%2C%201)%3B%0A%7D">Run</a></pre>
</div><h4 id='method.replace' class="method"><span id='replace.v' class='invisible'><code>fn <a href='#method.replace' class='fnname'>replace</a>(&mut self, value: T) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><T></code><div class='since' title='Stable since Rust version 1.9.0'>1.9.0</div></span></h4>
<div class='docblock'><p>Adds a value to the set, replacing the existing value, if any, that is equal to the given
one. Returns the replaced value.</p>
</div><h4 id='method.remove' class="method"><span id='remove.v' class='invisible'><code>fn <a href='#method.remove' class='fnname'>remove</a><Q: ?<a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>>(&mut self, value: &Q) -> bool <span class="where fmt-newline">where<br> T: <a class="trait" href="../../collections/borrow/trait.Borrow.html" title="trait collections::borrow::Borrow">Borrow</a><Q>,<br> Q: <a class="trait" href="../../core/cmp/trait.Ord.html" title="trait core::cmp::Ord">Ord</a>, </span></code></span></h4>
<div class='docblock'><p>Removes a value from the set. Returns <code>true</code> if the value was
present in the set.</p>
<p>The value may be any borrowed form of the set's value type,
but the ordering on the borrowed form <em>must</em> match the
ordering on the value type.</p>
<h1 id='examples-16' class='section-header'><a href='#examples-16'>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">BTreeSet</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">set</span> <span class="op">=</span> <span class="ident">BTreeSet</span>::<span class="ident">new</span>();
<span class="ident">set</span>.<span class="ident">insert</span>(<span class="number">2</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">set</span>.<span class="ident">remove</span>(<span class="kw-2">&</span><span class="number">2</span>), <span class="bool-val">true</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">set</span>.<span class="ident">remove</span>(<span class="kw-2">&</span><span class="number">2</span>), <span class="bool-val">false</span>);<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=extern%20crate%20collections%3B%0Afn%20main()%20%7B%0Ause%20std%3A%3Acollections%3A%3ABTreeSet%3B%0A%0Alet%20mut%20set%20%3D%20BTreeSet%3A%3Anew()%3B%0A%0Aset.insert(2)%3B%0Aassert_eq!(set.remove(%262)%2C%20true)%3B%0Aassert_eq!(set.remove(%262)%2C%20false)%3B%0A%7D">Run</a></pre>
</div><h4 id='method.take' class="method"><span id='take.v' class='invisible'><code>fn <a href='#method.take' class='fnname'>take</a><Q: ?<a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>>(&mut self, value: &Q) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><T> <span class="where fmt-newline">where<br> T: <a class="trait" href="../../collections/borrow/trait.Borrow.html" title="trait collections::borrow::Borrow">Borrow</a><Q>,<br> Q: <a class="trait" href="../../core/cmp/trait.Ord.html" title="trait core::cmp::Ord">Ord</a>, </span></code><div class='since' title='Stable since Rust version 1.9.0'>1.9.0</div></span></h4>
<div class='docblock'><p>Removes and returns the value in the set, if any, that is equal to the given one.</p>
<p>The value may be any borrowed form of the set's value type,
but the ordering on the borrowed form <em>must</em> match the
ordering on the value type.</p>
</div><h4 id='method.append' class="method"><span id='append.v' class='invisible'><code>fn <a href='#method.append' class='fnname'>append</a>(&mut self, other: &mut Self)</code><div class='since' title='Stable since Rust version 1.11.0'>1.11.0</div></span></h4>
<div class='docblock'><p>Moves all elements from <code>other</code> into <code>Self</code>, leaving <code>other</code> empty.</p>
<h1 id='examples-17' class='section-header'><a href='#examples-17'>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">BTreeSet</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">a</span> <span class="op">=</span> <span class="ident">BTreeSet</span>::<span class="ident">new</span>();
<span class="ident">a</span>.<span class="ident">insert</span>(<span class="number">1</span>);
<span class="ident">a</span>.<span class="ident">insert</span>(<span class="number">2</span>);
<span class="ident">a</span>.<span class="ident">insert</span>(<span class="number">3</span>);
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">b</span> <span class="op">=</span> <span class="ident">BTreeSet</span>::<span class="ident">new</span>();
<span class="ident">b</span>.<span class="ident">insert</span>(<span class="number">3</span>);
<span class="ident">b</span>.<span class="ident">insert</span>(<span class="number">4</span>);
<span class="ident">b</span>.<span class="ident">insert</span>(<span class="number">5</span>);
<span class="ident">a</span>.<span class="ident">append</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">b</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">a</span>.<span class="ident">len</span>(), <span class="number">5</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">b</span>.<span class="ident">len</span>(), <span class="number">0</span>);
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">a</span>.<span class="ident">contains</span>(<span class="kw-2">&</span><span class="number">1</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">a</span>.<span class="ident">contains</span>(<span class="kw-2">&</span><span class="number">2</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">a</span>.<span class="ident">contains</span>(<span class="kw-2">&</span><span class="number">3</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">a</span>.<span class="ident">contains</span>(<span class="kw-2">&</span><span class="number">4</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">a</span>.<span class="ident">contains</span>(<span class="kw-2">&</span><span class="number">5</span>));<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=extern%20crate%20collections%3B%0Afn%20main()%20%7B%0Ause%20std%3A%3Acollections%3A%3ABTreeSet%3B%0A%0Alet%20mut%20a%20%3D%20BTreeSet%3A%3Anew()%3B%0Aa.insert(1)%3B%0Aa.insert(2)%3B%0Aa.insert(3)%3B%0A%0Alet%20mut%20b%20%3D%20BTreeSet%3A%3Anew()%3B%0Ab.insert(3)%3B%0Ab.insert(4)%3B%0Ab.insert(5)%3B%0A%0Aa.append(%26mut%20b)%3B%0A%0Aassert_eq!(a.len()%2C%205)%3B%0Aassert_eq!(b.len()%2C%200)%3B%0A%0Aassert!(a.contains(%261))%3B%0Aassert!(a.contains(%262))%3B%0Aassert!(a.contains(%263))%3B%0Aassert!(a.contains(%264))%3B%0Aassert!(a.contains(%265))%3B%0A%7D">Run</a></pre>
</div><h4 id='method.split_off' class="method"><span id='split_off.v' class='invisible'><code>fn <a href='#method.split_off' class='fnname'>split_off</a><Q: ?<a class="trait" href="../../core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a> + <a class="trait" href="../../core/cmp/trait.Ord.html" title="trait core::cmp::Ord">Ord</a>>(&mut self, key: &Q) -> Self <span class="where fmt-newline">where<br> T: <a class="trait" href="../../collections/borrow/trait.Borrow.html" title="trait collections::borrow::Borrow">Borrow</a><Q>, </span></code><div class='since' title='Stable since Rust version 1.11.0'>1.11.0</div></span></h4>
<div class='docblock'><p>Splits the collection into two at the given key. Returns everything after the given key,
including the key.</p>
<h1 id='examples-18' class='section-header'><a href='#examples-18'>Examples</a></h1>
<p>Basic usage:</p>
<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">a</span> <span class="op">=</span> <span class="ident">BTreeMap</span>::<span class="ident">new</span>();
<span class="ident">a</span>.<span class="ident">insert</span>(<span class="number">1</span>, <span class="string">"a"</span>);
<span class="ident">a</span>.<span class="ident">insert</span>(<span class="number">2</span>, <span class="string">"b"</span>);
<span class="ident">a</span>.<span class="ident">insert</span>(<span class="number">3</span>, <span class="string">"c"</span>);
<span class="ident">a</span>.<span class="ident">insert</span>(<span class="number">17</span>, <span class="string">"d"</span>);
<span class="ident">a</span>.<span class="ident">insert</span>(<span class="number">41</span>, <span class="string">"e"</span>);
<span class="kw">let</span> <span class="ident">b</span> <span class="op">=</span> <span class="ident">a</span>.<span class="ident">split_off</span>(<span class="kw-2">&</span><span class="number">3</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">a</span>.<span class="ident">len</span>(), <span class="number">2</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">b</span>.<span class="ident">len</span>(), <span class="number">3</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">a</span>[<span class="kw-2">&</span><span class="number">1</span>], <span class="string">"a"</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">a</span>[<span class="kw-2">&</span><span class="number">2</span>], <span class="string">"b"</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">b</span>[<span class="kw-2">&</span><span class="number">3</span>], <span class="string">"c"</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">b</span>[<span class="kw-2">&</span><span class="number">17</span>], <span class="string">"d"</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">b</span>[<span class="kw-2">&</span><span class="number">41</span>], <span class="string">"e"</span>);<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=extern%20crate%20collections%3B%0Afn%20main()%20%7B%0Ause%20std%3A%3Acollections%3A%3ABTreeMap%3B%0A%0Alet%20mut%20a%20%3D%20BTreeMap%3A%3Anew()%3B%0Aa.insert(1%2C%20%22a%22)%3B%0Aa.insert(2%2C%20%22b%22)%3B%0Aa.insert(3%2C%20%22c%22)%3B%0Aa.insert(17%2C%20%22d%22)%3B%0Aa.insert(41%2C%20%22e%22)%3B%0A%0Alet%20b%20%3D%20a.split_off(%263)%3B%0A%0Aassert_eq!(a.len()%2C%202)%3B%0Aassert_eq!(b.len()%2C%203)%3B%0A%0Aassert_eq!(a%5B%261%5D%2C%20%22a%22)%3B%0Aassert_eq!(a%5B%262%5D%2C%20%22b%22)%3B%0A%0Aassert_eq!(b%5B%263%5D%2C%20%22c%22)%3B%0Aassert_eq!(b%5B%2617%5D%2C%20%22d%22)%3B%0Aassert_eq!(b%5B%2641%5D%2C%20%22e%22)%3B%0A%7D">Run</a></pre>
</div></div><h2 id='implementations'>Trait Implementations</h2><h3 class='impl'><span class='in-band'><code>impl<T: <a class="trait" href="../../core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a>> <a class="trait" href="../../core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a> for <a class="struct" href="../../collections/btree_set/struct.BTreeSet.html" title="struct collections::btree_set::BTreeSet">BTreeSet</a><T></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/collections/btree/set.rs.html#71' title='goto source code'>[src]</a></span></h3>
<div class='impl-items'><h4 id='method.clone' class="method"><span id='clone.v' class='invisible'><code>fn <a href='../../core/clone/trait.Clone.html#tymethod.clone' class='fnname'>clone</a>(&self) -> <a class="struct" href="../../collections/btree_set/struct.BTreeSet.html" title="struct collections::btree_set::BTreeSet">BTreeSet</a><T></code></span></h4>
<div class='docblock'><p>Returns a copy of the value. <a href="../../core/clone/trait.Clone.html#tymethod.clone">Read more</a></p>
</div><h4 id='method.clone_from' class="method"><span id='clone_from.v' class='invisible'><code>fn <a href='../../core/clone/trait.Clone.html#method.clone_from' class='fnname'>clone_from</a>(&mut self, source: &Self)</code></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 class='impl'><span class='in-band'><code>impl<T: <a class="trait" href="../../core/hash/trait.Hash.html" title="trait core::hash::Hash">Hash</a>> <a class="trait" href="../../core/hash/trait.Hash.html" title="trait core::hash::Hash">Hash</a> for <a class="struct" href="../../collections/btree_set/struct.BTreeSet.html" title="struct collections::btree_set::BTreeSet">BTreeSet</a><T></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/collections/btree/set.rs.html#71' title='goto source code'>[src]</a></span></h3>
<div class='impl-items'><h4 id='method.hash' class="method"><span id='hash.v' class='invisible'><code>fn <a href='../../core/hash/trait.Hash.html#tymethod.hash' class='fnname'>hash</a><__HT: <a class="trait" href="../../core/hash/trait.Hasher.html" title="trait core::hash::Hasher">Hasher</a>>(&self, __arg_0: &mut __HT)</code></span></h4>
<div class='docblock'><p>Feeds this value into the given [<code>Hasher</code>]. <a href="../../core/hash/trait.Hash.html#tymethod.hash">Read more</a></p>
</div><h4 id='method.hash_slice' class="method"><span id='hash_slice.v' class='invisible'><code>fn <a href='../../core/hash/trait.Hash.html#method.hash_slice' class='fnname'>hash_slice</a><H>(data: &[Self], state: &mut H) <span class="where fmt-newline">where<br> H: <a class="trait" href="../../core/hash/trait.Hasher.html" title="trait core::hash::Hasher">Hasher</a>, </span></code><div class='since' title='Stable since Rust version 1.3.0'>1.3.0</div></span></h4>
<div class='docblock'><p>Feeds a slice of this type into the given [<code>Hasher</code>]. <a href="../../core/hash/trait.Hash.html#method.hash_slice">Read more</a></p>
</div></div><h3 class='impl'><span class='in-band'><code>impl<T: <a class="trait" href="../../core/cmp/trait.PartialEq.html" title="trait core::cmp::PartialEq">PartialEq</a>> <a class="trait" href="../../core/cmp/trait.PartialEq.html" title="trait core::cmp::PartialEq">PartialEq</a> for <a class="struct" href="../../collections/btree_set/struct.BTreeSet.html" title="struct collections::btree_set::BTreeSet">BTreeSet</a><T></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/collections/btree/set.rs.html#71' title='goto source code'>[src]</a></span></h3>
<div class='impl-items'><h4 id='method.eq' class="method"><span id='eq.v' class='invisible'><code>fn <a href='../../core/cmp/trait.PartialEq.html#tymethod.eq' class='fnname'>eq</a>(&self, __arg_0: &<a class="struct" href="../../collections/btree_set/struct.BTreeSet.html" title="struct collections::btree_set::BTreeSet">BTreeSet</a><T>) -> bool</code></span></h4>
<div class='docblock'><p>This method tests for <code>self</code> and <code>other</code> values to be equal, and is used by <code>==</code>. <a href="../../core/cmp/trait.PartialEq.html#tymethod.eq">Read more</a></p>
</div><h4 id='method.ne' class="method"><span id='ne.v' class='invisible'><code>fn <a href='../../core/cmp/trait.PartialEq.html#method.ne' class='fnname'>ne</a>(&self, __arg_0: &<a class="struct" href="../../collections/btree_set/struct.BTreeSet.html" title="struct collections::btree_set::BTreeSet">BTreeSet</a><T>) -> bool</code></span></h4>
<div class='docblock'><p>This method tests for <code>!=</code>.</p>
</div></div><h3 class='impl'><span class='in-band'><code>impl<T: <a class="trait" href="../../core/cmp/trait.Eq.html" title="trait core::cmp::Eq">Eq</a>> <a class="trait" href="../../core/cmp/trait.Eq.html" title="trait core::cmp::Eq">Eq</a> for <a class="struct" href="../../collections/btree_set/struct.BTreeSet.html" title="struct collections::btree_set::BTreeSet">BTreeSet</a><T></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/collections/btree/set.rs.html#71' title='goto source code'>[src]</a></span></h3>
<div class='impl-items'></div><h3 class='impl'><span class='in-band'><code>impl<T: <a class="trait" href="../../core/cmp/trait.Ord.html" title="trait core::cmp::Ord">Ord</a>> <a class="trait" href="../../core/cmp/trait.Ord.html" title="trait core::cmp::Ord">Ord</a> for <a class="struct" href="../../collections/btree_set/struct.BTreeSet.html" title="struct collections::btree_set::BTreeSet">BTreeSet</a><T></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/collections/btree/set.rs.html#71' title='goto source code'>[src]</a></span></h3>
<div class='impl-items'><h4 id='method.cmp' class="method"><span id='cmp.v' class='invisible'><code>fn <a href='../../core/cmp/trait.Ord.html#tymethod.cmp' class='fnname'>cmp</a>(&self, __arg_0: &<a class="struct" href="../../collections/btree_set/struct.BTreeSet.html" title="struct collections::btree_set::BTreeSet">BTreeSet</a><T>) -> <a class="enum" href="../../core/cmp/enum.Ordering.html" title="enum core::cmp::Ordering">Ordering</a></code></span></h4>
<div class='docblock'><p>This method returns an <code>Ordering</code> between <code>self</code> and <code>other</code>. <a href="../../core/cmp/trait.Ord.html#tymethod.cmp">Read more</a></p>
</div></div><h3 class='impl'><span class='in-band'><code>impl<T: <a class="trait" href="../../core/cmp/trait.PartialOrd.html" title="trait core::cmp::PartialOrd">PartialOrd</a>> <a class="trait" href="../../core/cmp/trait.PartialOrd.html" title="trait core::cmp::PartialOrd">PartialOrd</a> for <a class="struct" href="../../collections/btree_set/struct.BTreeSet.html" title="struct collections::btree_set::BTreeSet">BTreeSet</a><T></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/collections/btree/set.rs.html#71' title='goto source code'>[src]</a></span></h3>
<div class='impl-items'><h4 id='method.partial_cmp' class="method"><span id='partial_cmp.v' class='invisible'><code>fn <a href='../../core/cmp/trait.PartialOrd.html#tymethod.partial_cmp' class='fnname'>partial_cmp</a>(&self, __arg_0: &<a class="struct" href="../../collections/btree_set/struct.BTreeSet.html" title="struct collections::btree_set::BTreeSet">BTreeSet</a><T>) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><<a class="enum" href="../../core/cmp/enum.Ordering.html" title="enum core::cmp::Ordering">Ordering</a>></code></span></h4>
<div class='docblock'><p>This method returns an ordering between <code>self</code> and <code>other</code> values if one exists. <a href="../../core/cmp/trait.PartialOrd.html#tymethod.partial_cmp">Read more</a></p>
</div><h4 id='method.lt' class="method"><span id='lt.v' class='invisible'><code>fn <a href='../../core/cmp/trait.PartialOrd.html#method.lt' class='fnname'>lt</a>(&self, __arg_0: &<a class="struct" href="../../collections/btree_set/struct.BTreeSet.html" title="struct collections::btree_set::BTreeSet">BTreeSet</a><T>) -> bool</code></span></h4>
<div class='docblock'><p>This method tests less than (for <code>self</code> and <code>other</code>) and is used by the <code><</code> operator. <a href="../../core/cmp/trait.PartialOrd.html#method.lt">Read more</a></p>
</div><h4 id='method.le' class="method"><span id='le.v' class='invisible'><code>fn <a href='../../core/cmp/trait.PartialOrd.html#method.le' class='fnname'>le</a>(&self, __arg_0: &<a class="struct" href="../../collections/btree_set/struct.BTreeSet.html" title="struct collections::btree_set::BTreeSet">BTreeSet</a><T>) -> bool</code></span></h4>
<div class='docblock'><p>This method tests less than or equal to (for <code>self</code> and <code>other</code>) and is used by the <code><=</code> operator. <a href="../../core/cmp/trait.PartialOrd.html#method.le">Read more</a></p>
</div><h4 id='method.gt' class="method"><span id='gt.v' class='invisible'><code>fn <a href='../../core/cmp/trait.PartialOrd.html#method.gt' class='fnname'>gt</a>(&self, __arg_0: &<a class="struct" href="../../collections/btree_set/struct.BTreeSet.html" title="struct collections::btree_set::BTreeSet">BTreeSet</a><T>) -> bool</code></span></h4>
<div class='docblock'><p>This method tests greater than (for <code>self</code> and <code>other</code>) and is used by the <code>></code> operator. <a href="../../core/cmp/trait.PartialOrd.html#method.gt">Read more</a></p>
</div><h4 id='method.ge' class="method"><span id='ge.v' class='invisible'><code>fn <a href='../../core/cmp/trait.PartialOrd.html#method.ge' class='fnname'>ge</a>(&self, __arg_0: &<a class="struct" href="../../collections/btree_set/struct.BTreeSet.html" title="struct collections::btree_set::BTreeSet">BTreeSet</a><T>) -> bool</code></span></h4>
<div class='docblock'><p>This method tests greater than or equal to (for <code>self</code> and <code>other</code>) and is used by the <code>>=</code> operator. <a href="../../core/cmp/trait.PartialOrd.html#method.ge">Read more</a></p>
</div></div><h3 class='impl'><span class='in-band'><code>impl<T: <a class="trait" href="../../core/cmp/trait.Ord.html" title="trait core::cmp::Ord">Ord</a>> <a class="trait" href="../../core/iter/traits/trait.FromIterator.html" title="trait core::iter::traits::FromIterator">FromIterator</a><T> for <a class="struct" href="../../collections/btree_set/struct.BTreeSet.html" title="struct collections::btree_set::BTreeSet">BTreeSet</a><T></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/collections/btree/set.rs.html#728-734' title='goto source code'>[src]</a></span></h3>
<div class='impl-items'><h4 id='method.from_iter' class="method"><span id='from_iter.v' class='invisible'><code>fn <a href='../../core/iter/traits/trait.FromIterator.html#tymethod.from_iter' class='fnname'>from_iter</a><I: <a class="trait" href="../../core/iter/traits/trait.IntoIterator.html" title="trait core::iter::traits::IntoIterator">IntoIterator</a><Item = T>>(iter: I) -> <a class="struct" href="../../collections/btree_set/struct.BTreeSet.html" title="struct collections::btree_set::BTreeSet">BTreeSet</a><T></code></span></h4>
<div class='docblock'><p>Creates a value from an iterator. <a href="../../core/iter/traits/trait.FromIterator.html#tymethod.from_iter">Read more</a></p>
</div></div><h3 class='impl'><span class='in-band'><code>impl<T> <a class="trait" href="../../core/iter/traits/trait.IntoIterator.html" title="trait core::iter::traits::IntoIterator">IntoIterator</a> for <a class="struct" href="../../collections/btree_set/struct.BTreeSet.html" title="struct collections::btree_set::BTreeSet">BTreeSet</a><T></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/collections/btree/set.rs.html#737-756' title='goto source code'>[src]</a></span></h3>
<div class='impl-items'><h4 id='associatedtype.Item' class="type"><span id='Item.t' class='invisible'><code>type <a href='../../core/iter/traits/trait.IntoIterator.html#associatedtype.Item' class="type">Item</a> = T</code></span></h4>
<div class='docblock'><p>The type of the elements being iterated over.</p>
</div><h4 id='associatedtype.IntoIter' class="type"><span id='IntoIter.t' class='invisible'><code>type <a href='../../core/iter/traits/trait.IntoIterator.html#associatedtype.IntoIter' class="type">IntoIter</a> = <a class="struct" href="../../collections/btree_set/struct.IntoIter.html" title="struct collections::btree_set::IntoIter">IntoIter</a><T></code></span></h4>
<div class='docblock'><p>Which kind of iterator are we turning this into?</p>
</div><h4 id='method.into_iter' class="method"><span id='into_iter.v' class='invisible'><code>fn <a href='../../core/iter/traits/trait.IntoIterator.html#tymethod.into_iter' class='fnname'>into_iter</a>(self) -> <a class="struct" href="../../collections/btree_set/struct.IntoIter.html" title="struct collections::btree_set::IntoIter">IntoIter</a><T></code></span></h4>
<div class='docblock'><p>Gets an iterator for moving out the <code>BTreeSet</code>'s contents.</p>
<h1 id='examples-19' class='section-header'><a href='#examples-19'>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">BTreeSet</span>;
<span class="kw">let</span> <span class="ident">set</span>: <span class="ident">BTreeSet</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> <span class="op">=</span> [<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>].<span class="ident">iter</span>().<span class="ident">cloned</span>().<span class="ident">collect</span>();
<span class="kw">let</span> <span class="ident">v</span>: <span class="ident">Vec</span><span class="op"><</span>_<span class="op">></span> <span class="op">=</span> <span class="ident">set</span>.<span class="ident">into_iter</span>().<span class="ident">collect</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>, [<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>]);<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=extern%20crate%20collections%3B%0Afn%20main()%20%7B%0Ause%20std%3A%3Acollections%3A%3ABTreeSet%3B%0A%0Alet%20set%3A%20BTreeSet%3Cusize%3E%20%3D%20%5B1%2C%202%2C%203%2C%204%5D.iter().cloned().collect()%3B%0A%0Alet%20v%3A%20Vec%3C_%3E%20%3D%20set.into_iter().collect()%3B%0Aassert_eq!(v%2C%20%5B1%2C%202%2C%203%2C%204%5D)%3B%0A%7D">Run</a></pre>
</div></div><h3 class='impl'><span class='in-band'><code>impl<'a, T> <a class="trait" href="../../core/iter/traits/trait.IntoIterator.html" title="trait core::iter::traits::IntoIterator">IntoIterator</a> for &'a <a class="struct" href="../../collections/btree_set/struct.BTreeSet.html" title="struct collections::btree_set::BTreeSet">BTreeSet</a><T></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/collections/btree/set.rs.html#759-766' title='goto source code'>[src]</a></span></h3>
<div class='impl-items'><h4 id='associatedtype.Item-1' class="type"><span id='Item.t-1' class='invisible'><code>type <a href='../../core/iter/traits/trait.IntoIterator.html#associatedtype.Item' class="type">Item</a> = &'a T</code></span></h4>
<div class='docblock'><p>The type of the elements being iterated over.</p>
</div><h4 id='associatedtype.IntoIter-1' class="type"><span id='IntoIter.t-1' class='invisible'><code>type <a href='../../core/iter/traits/trait.IntoIterator.html#associatedtype.IntoIter' class="type">IntoIter</a> = <a class="struct" href="../../collections/btree_set/struct.Iter.html" title="struct collections::btree_set::Iter">Iter</a><'a, T></code></span></h4>
<div class='docblock'><p>Which kind of iterator are we turning this into?</p>
</div><h4 id='method.into_iter-1' class="method"><span id='into_iter.v-1' class='invisible'><code>fn <a href='../../core/iter/traits/trait.IntoIterator.html#tymethod.into_iter' class='fnname'>into_iter</a>(self) -> <a class="struct" href="../../collections/btree_set/struct.Iter.html" title="struct collections::btree_set::Iter">Iter</a><'a, T></code></span></h4>
<div class='docblock'><p>Creates an iterator from a value. <a href="../../core/iter/traits/trait.IntoIterator.html#tymethod.into_iter">Read more</a></p>
</div></div><h3 class='impl'><span class='in-band'><code>impl<T: <a class="trait" href="../../core/cmp/trait.Ord.html" title="trait core::cmp::Ord">Ord</a>> <a class="trait" href="../../core/iter/traits/trait.Extend.html" title="trait core::iter::traits::Extend">Extend</a><T> for <a class="struct" href="../../collections/btree_set/struct.BTreeSet.html" title="struct collections::btree_set::BTreeSet">BTreeSet</a><T></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/collections/btree/set.rs.html#769-776' title='goto source code'>[src]</a></span></h3>
<div class='impl-items'><h4 id='method.extend' class="method"><span id='extend.v' class='invisible'><code>fn <a href='../../core/iter/traits/trait.Extend.html#tymethod.extend' class='fnname'>extend</a><Iter: <a class="trait" href="../../core/iter/traits/trait.IntoIterator.html" title="trait core::iter::traits::IntoIterator">IntoIterator</a><Item = T>>(&mut self, iter: Iter)</code></span></h4>
<div class='docblock'><p>Extends a collection with the contents of an iterator. <a href="../../core/iter/traits/trait.Extend.html#tymethod.extend">Read more</a></p>
</div></div><h3 class='impl'><span class='in-band'><code>impl<'a, T: 'a + <a class="trait" href="../../core/cmp/trait.Ord.html" title="trait core::cmp::Ord">Ord</a> + <a class="trait" href="../../core/marker/trait.Copy.html" title="trait core::marker::Copy">Copy</a>> <a class="trait" href="../../core/iter/traits/trait.Extend.html" title="trait core::iter::traits::Extend">Extend</a><&'a T> for <a class="struct" href="../../collections/btree_set/struct.BTreeSet.html" title="struct collections::btree_set::BTreeSet">BTreeSet</a><T></code></span><span class='out-of-band'><div class='ghost'></div><div class='since' title='Stable since Rust version 1.2.0'>1.2.0</div><a class='srclink' href='../../src/collections/btree/set.rs.html#779-783' title='goto source code'>[src]</a></span></h3>
<div class='impl-items'><h4 id='method.extend-1' class="method"><span id='extend.v-1' class='invisible'><code>fn <a href='../../core/iter/traits/trait.Extend.html#tymethod.extend' class='fnname'>extend</a><I: <a class="trait" href="../../core/iter/traits/trait.IntoIterator.html" title="trait core::iter::traits::IntoIterator">IntoIterator</a><Item = &'a T>>(&mut self, iter: I)</code></span></h4>
<div class='docblock'><p>Extends a collection with the contents of an iterator. <a href="../../core/iter/traits/trait.Extend.html#tymethod.extend">Read more</a></p>
</div></div><h3 class='impl'><span class='in-band'><code>impl<T: <a class="trait" href="../../core/cmp/trait.Ord.html" title="trait core::cmp::Ord">Ord</a>> <a class="trait" href="../../core/default/trait.Default.html" title="trait core::default::Default">Default</a> for <a class="struct" href="../../collections/btree_set/struct.BTreeSet.html" title="struct collections::btree_set::BTreeSet">BTreeSet</a><T></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/collections/btree/set.rs.html#786-791' title='goto source code'>[src]</a></span></h3>
<div class='impl-items'><h4 id='method.default' class="method"><span id='default.v' class='invisible'><code>fn <a href='../../core/default/trait.Default.html#tymethod.default' class='fnname'>default</a>() -> <a class="struct" href="../../collections/btree_set/struct.BTreeSet.html" title="struct collections::btree_set::BTreeSet">BTreeSet</a><T></code></span></h4>
<div class='docblock'><p>Makes an empty <code>BTreeSet<T></code> with a reasonable choice of B.</p>
</div></div><h3 class='impl'><span class='in-band'><code>impl<'a, 'b, T: <a class="trait" href="../../core/cmp/trait.Ord.html" title="trait core::cmp::Ord">Ord</a> + <a class="trait" href="../../core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a>> <a class="trait" href="../../core/ops/trait.Sub.html" title="trait core::ops::Sub">Sub</a><&'b <a class="struct" href="../../collections/btree_set/struct.BTreeSet.html" title="struct collections::btree_set::BTreeSet">BTreeSet</a><T>> for &'a <a class="struct" href="../../collections/btree_set/struct.BTreeSet.html" title="struct collections::btree_set::BTreeSet">BTreeSet</a><T></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/collections/btree/set.rs.html#794-814' title='goto source code'>[src]</a></span></h3>
<div class='impl-items'><h4 id='associatedtype.Output' class="type"><span id='Output.t' class='invisible'><code>type <a href='../../core/ops/trait.Sub.html#associatedtype.Output' class="type">Output</a> = <a class="struct" href="../../collections/btree_set/struct.BTreeSet.html" title="struct collections::btree_set::BTreeSet">BTreeSet</a><T></code></span></h4>
<div class='docblock'><p>The resulting type after applying the <code>-</code> operator</p>
</div><h4 id='method.sub' class="method"><span id='sub.v' class='invisible'><code>fn <a href='../../core/ops/trait.Sub.html#tymethod.sub' class='fnname'>sub</a>(self, rhs: &<a class="struct" href="../../collections/btree_set/struct.BTreeSet.html" title="struct collections::btree_set::BTreeSet">BTreeSet</a><T>) -> <a class="struct" href="../../collections/btree_set/struct.BTreeSet.html" title="struct collections::btree_set::BTreeSet">BTreeSet</a><T></code></span></h4>
<div class='docblock'><p>Returns the difference of <code>self</code> and <code>rhs</code> as a new <code>BTreeSet<T></code>.</p>
<h1 id='examples-20' class='section-header'><a href='#examples-20'>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">BTreeSet</span>;
<span class="kw">let</span> <span class="ident">a</span>: <span class="ident">BTreeSet</span><span class="op"><</span>_<span class="op">></span> <span class="op">=</span> <span class="macro">vec</span><span class="macro">!</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>].<span class="ident">into_iter</span>().<span class="ident">collect</span>();
<span class="kw">let</span> <span class="ident">b</span>: <span class="ident">BTreeSet</span><span class="op"><</span>_<span class="op">></span> <span class="op">=</span> <span class="macro">vec</span><span class="macro">!</span>[<span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>].<span class="ident">into_iter</span>().<span class="ident">collect</span>();
<span class="kw">let</span> <span class="ident">result</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">a</span> <span class="op">-</span> <span class="kw-2">&</span><span class="ident">b</span>;
<span class="kw">let</span> <span class="ident">result_vec</span>: <span class="ident">Vec</span><span class="op"><</span>_<span class="op">></span> <span class="op">=</span> <span class="ident">result</span>.<span class="ident">into_iter</span>().<span class="ident">collect</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">result_vec</span>, [<span class="number">1</span>, <span class="number">2</span>]);<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=extern%20crate%20collections%3B%0Afn%20main()%20%7B%0Ause%20std%3A%3Acollections%3A%3ABTreeSet%3B%0A%0Alet%20a%3A%20BTreeSet%3C_%3E%20%3D%20vec!%5B1%2C%202%2C%203%5D.into_iter().collect()%3B%0Alet%20b%3A%20BTreeSet%3C_%3E%20%3D%20vec!%5B3%2C%204%2C%205%5D.into_iter().collect()%3B%0A%0Alet%20result%20%3D%20%26a%20-%20%26b%3B%0Alet%20result_vec%3A%20Vec%3C_%3E%20%3D%20result.into_iter().collect()%3B%0Aassert_eq!(result_vec%2C%20%5B1%2C%202%5D)%3B%0A%7D">Run</a></pre>
</div></div><h3 class='impl'><span class='in-band'><code>impl<'a, 'b, T: <a class="trait" href="../../core/cmp/trait.Ord.html" title="trait core::cmp::Ord">Ord</a> + <a class="trait" href="../../core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a>> <a class="trait" href="../../core/ops/trait.BitXor.html" title="trait core::ops::BitXor">BitXor</a><&'b <a class="struct" href="../../collections/btree_set/struct.BTreeSet.html" title="struct collections::btree_set::BTreeSet">BTreeSet</a><T>> for &'a <a class="struct" href="../../collections/btree_set/struct.BTreeSet.html" title="struct collections::btree_set::BTreeSet">BTreeSet</a><T></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/collections/btree/set.rs.html#817-837' title='goto source code'>[src]</a></span></h3>
<div class='impl-items'><h4 id='associatedtype.Output-1' class="type"><span id='Output.t-1' class='invisible'><code>type <a href='../../core/ops/trait.BitXor.html#associatedtype.Output' class="type">Output</a> = <a class="struct" href="../../collections/btree_set/struct.BTreeSet.html" title="struct collections::btree_set::BTreeSet">BTreeSet</a><T></code></span></h4>
<div class='docblock'><p>The resulting type after applying the <code>^</code> operator</p>
</div><h4 id='method.bitxor' class="method"><span id='bitxor.v' class='invisible'><code>fn <a href='../../core/ops/trait.BitXor.html#tymethod.bitxor' class='fnname'>bitxor</a>(self, rhs: &<a class="struct" href="../../collections/btree_set/struct.BTreeSet.html" title="struct collections::btree_set::BTreeSet">BTreeSet</a><T>) -> <a class="struct" href="../../collections/btree_set/struct.BTreeSet.html" title="struct collections::btree_set::BTreeSet">BTreeSet</a><T></code></span></h4>
<div class='docblock'><p>Returns the symmetric difference of <code>self</code> and <code>rhs</code> as a new <code>BTreeSet<T></code>.</p>
<h1 id='examples-21' class='section-header'><a href='#examples-21'>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">BTreeSet</span>;
<span class="kw">let</span> <span class="ident">a</span>: <span class="ident">BTreeSet</span><span class="op"><</span>_<span class="op">></span> <span class="op">=</span> <span class="macro">vec</span><span class="macro">!</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>].<span class="ident">into_iter</span>().<span class="ident">collect</span>();
<span class="kw">let</span> <span class="ident">b</span>: <span class="ident">BTreeSet</span><span class="op"><</span>_<span class="op">></span> <span class="op">=</span> <span class="macro">vec</span><span class="macro">!</span>[<span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>].<span class="ident">into_iter</span>().<span class="ident">collect</span>();
<span class="kw">let</span> <span class="ident">result</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">a</span> <span class="op">^</span> <span class="kw-2">&</span><span class="ident">b</span>;
<span class="kw">let</span> <span class="ident">result_vec</span>: <span class="ident">Vec</span><span class="op"><</span>_<span class="op">></span> <span class="op">=</span> <span class="ident">result</span>.<span class="ident">into_iter</span>().<span class="ident">collect</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">result_vec</span>, [<span class="number">1</span>, <span class="number">4</span>]);<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=extern%20crate%20collections%3B%0Afn%20main()%20%7B%0Ause%20std%3A%3Acollections%3A%3ABTreeSet%3B%0A%0Alet%20a%3A%20BTreeSet%3C_%3E%20%3D%20vec!%5B1%2C%202%2C%203%5D.into_iter().collect()%3B%0Alet%20b%3A%20BTreeSet%3C_%3E%20%3D%20vec!%5B2%2C%203%2C%204%5D.into_iter().collect()%3B%0A%0Alet%20result%20%3D%20%26a%20%5E%20%26b%3B%0Alet%20result_vec%3A%20Vec%3C_%3E%20%3D%20result.into_iter().collect()%3B%0Aassert_eq!(result_vec%2C%20%5B1%2C%204%5D)%3B%0A%7D">Run</a></pre>
</div></div><h3 class='impl'><span class='in-band'><code>impl<'a, 'b, T: <a class="trait" href="../../core/cmp/trait.Ord.html" title="trait core::cmp::Ord">Ord</a> + <a class="trait" href="../../core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a>> <a class="trait" href="../../core/ops/trait.BitAnd.html" title="trait core::ops::BitAnd">BitAnd</a><&'b <a class="struct" href="../../collections/btree_set/struct.BTreeSet.html" title="struct collections::btree_set::BTreeSet">BTreeSet</a><T>> for &'a <a class="struct" href="../../collections/btree_set/struct.BTreeSet.html" title="struct collections::btree_set::BTreeSet">BTreeSet</a><T></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/collections/btree/set.rs.html#840-860' title='goto source code'>[src]</a></span></h3>
<div class='impl-items'><h4 id='associatedtype.Output-2' class="type"><span id='Output.t-2' class='invisible'><code>type <a href='../../core/ops/trait.BitAnd.html#associatedtype.Output' class="type">Output</a> = <a class="struct" href="../../collections/btree_set/struct.BTreeSet.html" title="struct collections::btree_set::BTreeSet">BTreeSet</a><T></code></span></h4>
<div class='docblock'><p>The resulting type after applying the <code>&</code> operator</p>
</div><h4 id='method.bitand' class="method"><span id='bitand.v' class='invisible'><code>fn <a href='../../core/ops/trait.BitAnd.html#tymethod.bitand' class='fnname'>bitand</a>(self, rhs: &<a class="struct" href="../../collections/btree_set/struct.BTreeSet.html" title="struct collections::btree_set::BTreeSet">BTreeSet</a><T>) -> <a class="struct" href="../../collections/btree_set/struct.BTreeSet.html" title="struct collections::btree_set::BTreeSet">BTreeSet</a><T></code></span></h4>
<div class='docblock'><p>Returns the intersection of <code>self</code> and <code>rhs</code> as a new <code>BTreeSet<T></code>.</p>
<h1 id='examples-22' class='section-header'><a href='#examples-22'>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">BTreeSet</span>;
<span class="kw">let</span> <span class="ident">a</span>: <span class="ident">BTreeSet</span><span class="op"><</span>_<span class="op">></span> <span class="op">=</span> <span class="macro">vec</span><span class="macro">!</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>].<span class="ident">into_iter</span>().<span class="ident">collect</span>();
<span class="kw">let</span> <span class="ident">b</span>: <span class="ident">BTreeSet</span><span class="op"><</span>_<span class="op">></span> <span class="op">=</span> <span class="macro">vec</span><span class="macro">!</span>[<span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>].<span class="ident">into_iter</span>().<span class="ident">collect</span>();
<span class="kw">let</span> <span class="ident">result</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">a</span> <span class="op">&</span> <span class="kw-2">&</span><span class="ident">b</span>;
<span class="kw">let</span> <span class="ident">result_vec</span>: <span class="ident">Vec</span><span class="op"><</span>_<span class="op">></span> <span class="op">=</span> <span class="ident">result</span>.<span class="ident">into_iter</span>().<span class="ident">collect</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">result_vec</span>, [<span class="number">2</span>, <span class="number">3</span>]);<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=extern%20crate%20collections%3B%0Afn%20main()%20%7B%0Ause%20std%3A%3Acollections%3A%3ABTreeSet%3B%0A%0Alet%20a%3A%20BTreeSet%3C_%3E%20%3D%20vec!%5B1%2C%202%2C%203%5D.into_iter().collect()%3B%0Alet%20b%3A%20BTreeSet%3C_%3E%20%3D%20vec!%5B2%2C%203%2C%204%5D.into_iter().collect()%3B%0A%0Alet%20result%20%3D%20%26a%20%26%20%26b%3B%0Alet%20result_vec%3A%20Vec%3C_%3E%20%3D%20result.into_iter().collect()%3B%0Aassert_eq!(result_vec%2C%20%5B2%2C%203%5D)%3B%0A%7D">Run</a></pre>
</div></div><h3 class='impl'><span class='in-band'><code>impl<'a, 'b, T: <a class="trait" href="../../core/cmp/trait.Ord.html" title="trait core::cmp::Ord">Ord</a> + <a class="trait" href="../../core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a>> <a class="trait" href="../../core/ops/trait.BitOr.html" title="trait core::ops::BitOr">BitOr</a><&'b <a class="struct" href="../../collections/btree_set/struct.BTreeSet.html" title="struct collections::btree_set::BTreeSet">BTreeSet</a><T>> for &'a <a class="struct" href="../../collections/btree_set/struct.BTreeSet.html" title="struct collections::btree_set::BTreeSet">BTreeSet</a><T></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/collections/btree/set.rs.html#863-883' title='goto source code'>[src]</a></span></h3>
<div class='impl-items'><h4 id='associatedtype.Output-3' class="type"><span id='Output.t-3' class='invisible'><code>type <a href='../../core/ops/trait.BitOr.html#associatedtype.Output' class="type">Output</a> = <a class="struct" href="../../collections/btree_set/struct.BTreeSet.html" title="struct collections::btree_set::BTreeSet">BTreeSet</a><T></code></span></h4>
<div class='docblock'><p>The resulting type after applying the <code>|</code> operator</p>
</div><h4 id='method.bitor' class="method"><span id='bitor.v' class='invisible'><code>fn <a href='../../core/ops/trait.BitOr.html#tymethod.bitor' class='fnname'>bitor</a>(self, rhs: &<a class="struct" href="../../collections/btree_set/struct.BTreeSet.html" title="struct collections::btree_set::BTreeSet">BTreeSet</a><T>) -> <a class="struct" href="../../collections/btree_set/struct.BTreeSet.html" title="struct collections::btree_set::BTreeSet">BTreeSet</a><T></code></span></h4>
<div class='docblock'><p>Returns the union of <code>self</code> and <code>rhs</code> as a new <code>BTreeSet<T></code>.</p>
<h1 id='examples-23' class='section-header'><a href='#examples-23'>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">BTreeSet</span>;
<span class="kw">let</span> <span class="ident">a</span>: <span class="ident">BTreeSet</span><span class="op"><</span>_<span class="op">></span> <span class="op">=</span> <span class="macro">vec</span><span class="macro">!</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>].<span class="ident">into_iter</span>().<span class="ident">collect</span>();
<span class="kw">let</span> <span class="ident">b</span>: <span class="ident">BTreeSet</span><span class="op"><</span>_<span class="op">></span> <span class="op">=</span> <span class="macro">vec</span><span class="macro">!</span>[<span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>].<span class="ident">into_iter</span>().<span class="ident">collect</span>();
<span class="kw">let</span> <span class="ident">result</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">a</span> <span class="op">|</span> <span class="kw-2">&</span><span class="ident">b</span>;
<span class="kw">let</span> <span class="ident">result_vec</span>: <span class="ident">Vec</span><span class="op"><</span>_<span class="op">></span> <span class="op">=</span> <span class="ident">result</span>.<span class="ident">into_iter</span>().<span class="ident">collect</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">result_vec</span>, [<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>]);<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=extern%20crate%20collections%3B%0Afn%20main()%20%7B%0Ause%20std%3A%3Acollections%3A%3ABTreeSet%3B%0A%0Alet%20a%3A%20BTreeSet%3C_%3E%20%3D%20vec!%5B1%2C%202%2C%203%5D.into_iter().collect()%3B%0Alet%20b%3A%20BTreeSet%3C_%3E%20%3D%20vec!%5B3%2C%204%2C%205%5D.into_iter().collect()%3B%0A%0Alet%20result%20%3D%20%26a%20%7C%20%26b%3B%0Alet%20result_vec%3A%20Vec%3C_%3E%20%3D%20result.into_iter().collect()%3B%0Aassert_eq!(result_vec%2C%20%5B1%2C%202%2C%203%2C%204%2C%205%5D)%3B%0A%7D">Run</a></pre>
</div></div><h3 class='impl'><span class='in-band'><code>impl<T: <a class="trait" href="../../collections/fmt/trait.Debug.html" title="trait collections::fmt::Debug">Debug</a>> <a class="trait" href="../../collections/fmt/trait.Debug.html" title="trait collections::fmt::Debug">Debug</a> for <a class="struct" href="../../collections/btree_set/struct.BTreeSet.html" title="struct collections::btree_set::BTreeSet">BTreeSet</a><T></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/collections/btree/set.rs.html#886-890' 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='../../collections/fmt/trait.Debug.html#tymethod.fmt' class='fnname'>fmt</a>(&self, f: &mut <a class="struct" href="../../collections/fmt/struct.Formatter.html" title="struct collections::fmt::Formatter">Formatter</a>) -> <a class="type" href="../../collections/fmt/type.Result.html" title="type collections::fmt::Result">Result</a></code></span></h4>
<div class='docblock'><p>Formats the value using the given formatter.</p>
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