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<p class='location'>Struct InternSet</p><div class="sidebar-elems"><div class="block items"><a class="sidebar-title" href="#methods">Methods</a><div class="sidebar-links"><a href="#method.new">new</a><a href="#method.intern">intern</a></div><a class="sidebar-title" href="#deref-methods">Methods from Deref<Target=HashSet<ValueRc<T>>></a><div class="sidebar-links"><a href="#method.hasher">hasher</a><a href="#method.capacity">capacity</a><a href="#method.iter">iter</a><a href="#method.difference">difference</a><a href="#method.symmetric_difference">symmetric_difference</a><a href="#method.intersection">intersection</a><a href="#method.union">union</a><a href="#method.len">len</a><a href="#method.is_empty">is_empty</a><a href="#method.contains">contains</a><a href="#method.get">get</a><a href="#method.is_disjoint">is_disjoint</a><a href="#method.is_subset">is_subset</a><a href="#method.is_superset">is_superset</a></div><a class="sidebar-title" href="#implementations">Trait Implementations</a><div class="sidebar-links"><a href="#impl-Clone">Clone</a><a href="#impl-Debug">Debug</a><a href="#impl-Default">Default</a><a href="#impl-Eq">Eq</a><a href="#impl-PartialEq">PartialEq</a><a href="#impl-Deref">Deref</a><a href="#impl-DerefMut">DerefMut</a></div></div><p class='location'><a href='../index.html'>edn</a>::<wbr><a href='index.html'>intern_set</a></p><script>window.sidebarCurrent = {name: 'InternSet', ty: 'struct', relpath: ''};</script><script defer src="sidebar-items.js"></script></div>
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<h1 class='fqn'><span class='in-band'>Struct <a href='../index.html'>edn</a>::<wbr><a href='index.html'>intern_set</a>::<wbr><a class="struct" href=''>InternSet</a></span><span class='out-of-band'><span id='render-detail'>
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<a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">
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[<span class='inner'>−</span>]
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</a>
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</span><a class='srclink' href='../../src/edn/intern_set.rs.html#32-34' title='goto source code'>[src]</a></span></h1>
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<pre class='rust struct'>pub struct InternSet<T> <span class="where fmt-newline">where<br> T: <a class="trait" href="https://doc.rust-lang.org/nightly/core/cmp/trait.Eq.html" title="trait core::cmp::Eq">Eq</a> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/hash/trait.Hash.html" title="trait core::hash::Hash">Hash</a>, </span> { /* fields omitted */ }</pre><div class='docblock'><p>An <code>InternSet</code> allows to "intern" some potentially large values, maintaining a single value
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instance owned by the <code>InternSet</code> and leaving consumers with lightweight ref-counted handles to
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the large owned value. This can avoid expensive clone() operations.</p>
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<p>In Mentat, such large values might be strings or arbitrary [a v] pairs.</p>
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<p>See https://en.wikipedia.org/wiki/String_interning for discussion.</p>
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</div>
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<h2 id='methods' class='small-section-header'>
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Methods<a href='#methods' class='anchor'></a>
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</h2>
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<h3 id='impl' class='impl'><span class='in-band'><code>impl<T> <a class="struct" href="../../edn/intern_set/struct.InternSet.html" title="struct edn::intern_set::InternSet">InternSet</a><T> <span class="where fmt-newline">where<br> T: <a class="trait" href="https://doc.rust-lang.org/nightly/core/cmp/trait.Eq.html" title="trait core::cmp::Eq">Eq</a> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/hash/trait.Hash.html" title="trait core::hash::Hash">Hash</a>, </span></code><a href='#impl' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/edn/intern_set.rs.html#50-84' title='goto source code'>[src]</a></span></h3>
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<div class='impl-items'><h4 id='method.new' class="method"><span id='new.v' class='invisible'><code>pub fn <a href='#method.new' class='fnname'>new</a>() -> <a class="struct" href="../../edn/intern_set/struct.InternSet.html" title="struct edn::intern_set::InternSet">InternSet</a><T></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/edn/intern_set.rs.html#51-55' title='goto source code'>[src]</a></span></h4>
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<h4 id='method.intern' class="method"><span id='intern.v' class='invisible'><code>pub fn <a href='#method.intern' class='fnname'>intern</a><R: <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a><<a class="type" href="../../edn/value_rc/type.ValueRc.html" title="type edn::value_rc::ValueRc">ValueRc</a><T>>>(&mut self, value: R) -> <a class="type" href="../../edn/value_rc/type.ValueRc.html" title="type edn::value_rc::ValueRc">ValueRc</a><T></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/edn/intern_set.rs.html#76-83' title='goto source code'>[src]</a></span></h4>
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<div class='docblock'><p>Intern a value, providing a ref-counted handle to the interned value.</p>
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<pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="ident">edn</span>::{<span class="ident">InternSet</span>, <span class="ident">ValueRc</span>};
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<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">s</span> <span class="op">=</span> <span class="ident">InternSet</span>::<span class="ident">new</span>();
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<span class="kw">let</span> <span class="ident">one</span> <span class="op">=</span> <span class="string">"foo"</span>.<span class="ident">to_string</span>();
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<span class="kw">let</span> <span class="ident">two</span> <span class="op">=</span> <span class="ident">ValueRc</span>::<span class="ident">new</span>(<span class="string">"foo"</span>.<span class="ident">to_string</span>());
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<span class="kw">let</span> <span class="ident">out_one</span> <span class="op">=</span> <span class="ident">s</span>.<span class="ident">intern</span>(<span class="ident">one</span>);
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">out_one</span>, <span class="ident">two</span>);
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<span class="comment">// assert!(!&out_one.ptr_eq(&two)); // Nightly-only.</span>
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<span class="kw">let</span> <span class="ident">out_two</span> <span class="op">=</span> <span class="ident">s</span>.<span class="ident">intern</span>(<span class="ident">two</span>);
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">out_one</span>, <span class="ident">out_two</span>);
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="number">1</span>, <span class="ident">s</span>.<span class="ident">len</span>());
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<span class="comment">// assert!(&out_one.ptr_eq(&out_two)); // Nightly-only.</span></pre>
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</div></div>
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<h2 id='deref-methods' class='small-section-header'>
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Methods from <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/deref/trait.Deref.html" title="trait core::ops::deref::Deref">Deref</a><Target = <a class="struct" href="https://doc.rust-lang.org/nightly/std/collections/hash/set/struct.HashSet.html" title="struct std::collections::hash::set::HashSet">HashSet</a><<a class="type" href="../../edn/value_rc/type.ValueRc.html" title="type edn::value_rc::ValueRc">ValueRc</a><T>>><a href='#deref-methods' class='anchor'></a>
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</h2>
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<div class='impl-items'></div><div class='impl-items'><h4 id='method.hasher' class="method"><div class="important-traits"><div class='tooltip'>ⓘ<span class='tooltiptext'>Important traits for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&'a mut </a>R</span></div><div class="content hidden"><h3 class="important">Important traits for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&'a mut </a>R</h3><code class="content"><span class="where fmt-newline">impl<'a, R> <a class="trait" href="https://doc.rust-lang.org/nightly/std/io/trait.Read.html" title="trait std::io::Read">Read</a> for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&'a mut </a>R <span class="where fmt-newline">where<br> R: <a class="trait" href="https://doc.rust-lang.org/nightly/std/io/trait.Read.html" title="trait std::io::Read">Read</a> + ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>, </span></span><span class="where fmt-newline">impl<'a, W> <a class="trait" href="https://doc.rust-lang.org/nightly/std/io/trait.Write.html" title="trait std::io::Write">Write</a> for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&'a mut </a>W <span class="where fmt-newline">where<br> W: <a class="trait" href="https://doc.rust-lang.org/nightly/std/io/trait.Write.html" title="trait std::io::Write">Write</a> + ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>, </span></span><span class="where fmt-newline">impl<'a, I> <a class="trait" href="https://doc.rust-lang.org/nightly/core/iter/iterator/trait.Iterator.html" title="trait core::iter::iterator::Iterator">Iterator</a> for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&'a mut </a>I <span class="where fmt-newline">where<br> I: <a class="trait" href="https://doc.rust-lang.org/nightly/core/iter/iterator/trait.Iterator.html" title="trait core::iter::iterator::Iterator">Iterator</a> + ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>, </span></span><span class="where fmt-newline"> type <a href='https://doc.rust-lang.org/nightly/core/iter/iterator/trait.Iterator.html#associatedtype.Item' class="type">Item</a> = <I as <a class="trait" href="https://doc.rust-lang.org/nightly/core/iter/iterator/trait.Iterator.html" title="trait core::iter::iterator::Iterator">Iterator</a>>::<a class="type" href="https://doc.rust-lang.org/nightly/core/iter/iterator/trait.Iterator.html#associatedtype.Item" title="type core::iter::iterator::Iterator::Item">Item</a>;</span></code></div></div><span id='hasher.v' class='invisible'><code>pub fn <a href='#method.hasher' class='fnname'>hasher</a>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&</a>S</code></span><span class='out-of-band'><div class='ghost'></div><div class='since' title='Stable since Rust version 1.9.0'>1.9.0</div><a class='srclink' href='https://doc.rust-lang.org/nightly/src/std/collections/hash/set.rs.html#234-236' title='goto source code'>[src]</a></span></h4>
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<div class='docblock'><p>Returns a reference to the set's <a href="../../std/hash/trait.BuildHasher.html"><code>BuildHasher</code></a>.</p>
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<h1 id="examples" class="section-header"><a href="#examples">Examples</a></h1>
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<pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">collections</span>::<span class="ident">HashSet</span>;
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<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">collections</span>::<span class="ident">hash_map</span>::<span class="ident">RandomState</span>;
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<span class="kw">let</span> <span class="ident">hasher</span> <span class="op">=</span> <span class="ident">RandomState</span>::<span class="ident">new</span>();
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<span class="kw">let</span> <span class="ident">set</span>: <span class="ident">HashSet</span><span class="op"><</span><span class="ident">i32</span><span class="op">></span> <span class="op">=</span> <span class="ident">HashSet</span>::<span class="ident">with_hasher</span>(<span class="ident">hasher</span>);
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<span class="kw">let</span> <span class="ident">hasher</span>: <span class="kw-2">&</span><span class="ident">RandomState</span> <span class="op">=</span> <span class="ident">set</span>.<span class="ident">hasher</span>();</pre>
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</div><h4 id='method.capacity' class="method"><span id='capacity.v' class='invisible'><code>pub fn <a href='#method.capacity' class='fnname'>capacity</a>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a></code></span><span class='out-of-band'><div class='ghost'></div><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div><a class='srclink' href='https://doc.rust-lang.org/nightly/src/std/collections/hash/set.rs.html#249-251' title='goto source code'>[src]</a></span></h4>
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<div class='docblock'><p>Returns the number of elements the set can hold without reallocating.</p>
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<h1 id="examples-1" class="section-header"><a href="#examples-1">Examples</a></h1>
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<pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">collections</span>::<span class="ident">HashSet</span>;
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<span class="kw">let</span> <span class="ident">set</span>: <span class="ident">HashSet</span><span class="op"><</span><span class="ident">i32</span><span class="op">></span> <span class="op">=</span> <span class="ident">HashSet</span>::<span class="ident">with_capacity</span>(<span class="number">100</span>);
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<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">set</span>.<span class="ident">capacity</span>() <span class="op">>=</span> <span class="number">100</span>);</pre>
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</div><h4 id='method.reserve' class="method"><span id='reserve.v' class='invisible'><code>pub fn <a href='#method.reserve' class='fnname'>reserve</a>(&mut self, additional: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>)</code></span><span class='out-of-band'><div class='ghost'></div><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div><a class='srclink' href='https://doc.rust-lang.org/nightly/src/std/collections/hash/set.rs.html#270-272' title='goto source code'>[src]</a></span></h4>
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<div class='docblock'><p>Reserves capacity for at least <code>additional</code> more elements to be inserted
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in the <code>HashSet</code>. The collection may reserve more space to avoid
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frequent reallocations.</p>
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<h1 id="panics" class="section-header"><a href="#panics">Panics</a></h1>
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<p>Panics if the new allocation size overflows <code>usize</code>.</p>
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<h1 id="examples-2" class="section-header"><a href="#examples-2">Examples</a></h1>
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<pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">collections</span>::<span class="ident">HashSet</span>;
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<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">set</span>: <span class="ident">HashSet</span><span class="op"><</span><span class="ident">i32</span><span class="op">></span> <span class="op">=</span> <span class="ident">HashSet</span>::<span class="ident">new</span>();
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<span class="ident">set</span>.<span class="ident">reserve</span>(<span class="number">10</span>);
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<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">set</span>.<span class="ident">capacity</span>() <span class="op">>=</span> <span class="number">10</span>);</pre>
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</div><h4 id='method.shrink_to_fit' class="method"><span id='shrink_to_fit.v' class='invisible'><code>pub fn <a href='#method.shrink_to_fit' class='fnname'>shrink_to_fit</a>(&mut self)</code></span><span class='out-of-band'><div class='ghost'></div><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div><a class='srclink' href='https://doc.rust-lang.org/nightly/src/std/collections/hash/set.rs.html#291-293' title='goto source code'>[src]</a></span></h4>
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<div class='docblock'><p>Shrinks the capacity of the set as much as possible. It will drop
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down as much as possible while maintaining the internal rules
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and possibly leaving some space in accordance with the resize policy.</p>
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<h1 id="examples-3" class="section-header"><a href="#examples-3">Examples</a></h1>
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<pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">collections</span>::<span class="ident">HashSet</span>;
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<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">set</span> <span class="op">=</span> <span class="ident">HashSet</span>::<span class="ident">with_capacity</span>(<span class="number">100</span>);
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<span class="ident">set</span>.<span class="ident">insert</span>(<span class="number">1</span>);
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<span class="ident">set</span>.<span class="ident">insert</span>(<span class="number">2</span>);
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<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">set</span>.<span class="ident">capacity</span>() <span class="op">>=</span> <span class="number">100</span>);
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<span class="ident">set</span>.<span class="ident">shrink_to_fit</span>();
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|
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">set</span>.<span class="ident">capacity</span>() <span class="op">>=</span> <span class="number">2</span>);</pre>
|
|||
|
|
</div><h4 id='method.iter' class="method"><div class="important-traits"><div class='tooltip'>ⓘ<span class='tooltiptext'>Important traits for <a class="struct" href="https://doc.rust-lang.org/nightly/std/collections/hash/set/struct.Iter.html" title="struct std::collections::hash::set::Iter">Iter</a><'a, K></span></div><div class="content hidden"><h3 class="important">Important traits for <a class="struct" href="https://doc.rust-lang.org/nightly/std/collections/hash/set/struct.Iter.html" title="struct std::collections::hash::set::Iter">Iter</a><'a, K></h3><code class="content"><span class="where fmt-newline">impl<'a, K> <a class="trait" href="https://doc.rust-lang.org/nightly/core/iter/iterator/trait.Iterator.html" title="trait core::iter::iterator::Iterator">Iterator</a> for <a class="struct" href="https://doc.rust-lang.org/nightly/std/collections/hash/set/struct.Iter.html" title="struct std::collections::hash::set::Iter">Iter</a><'a, K></span><span class="where fmt-newline"> type <a href='https://doc.rust-lang.org/nightly/core/iter/iterator/trait.Iterator.html#associatedtype.Item' class="type">Item</a> = <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&'a </a>K;</span></code></div></div><span id='iter.v' class='invisible'><code>pub fn <a href='#method.iter' class='fnname'>iter</a>(&self) -> <a class="struct" href="https://doc.rust-lang.org/nightly/std/collections/hash/set/struct.Iter.html" title="struct std::collections::hash::set::Iter">Iter</a><T></code></span><span class='out-of-band'><div class='ghost'></div><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div><a class='srclink' href='https://doc.rust-lang.org/nightly/src/std/collections/hash/set.rs.html#312-314' title='goto source code'>[src]</a></span></h4>
|
|||
|
|
<div class='docblock'><p>An iterator visiting all elements in arbitrary order.
|
|||
|
|
The iterator element type is <code>&'a T</code>.</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">HashSet</span>;
|
|||
|
|
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">set</span> <span class="op">=</span> <span class="ident">HashSet</span>::<span class="ident">new</span>();
|
|||
|
|
<span class="ident">set</span>.<span class="ident">insert</span>(<span class="string">"a"</span>);
|
|||
|
|
<span class="ident">set</span>.<span class="ident">insert</span>(<span class="string">"b"</span>);
|
|||
|
|
|
|||
|
|
<span class="comment">// Will print in an arbitrary order.</span>
|
|||
|
|
<span class="kw">for</span> <span class="ident">x</span> <span class="kw">in</span> <span class="ident">set</span>.<span class="ident">iter</span>() {
|
|||
|
|
<span class="macro">println</span><span class="macro">!</span>(<span class="string">"{}"</span>, <span class="ident">x</span>);
|
|||
|
|
}</pre>
|
|||
|
|
</div><h4 id='method.difference' class="method"><div class="important-traits"><div class='tooltip'>ⓘ<span class='tooltiptext'>Important traits for <a class="struct" href="https://doc.rust-lang.org/nightly/std/collections/hash/set/struct.Difference.html" title="struct std::collections::hash::set::Difference">Difference</a><'a, T, S></span></div><div class="content hidden"><h3 class="important">Important traits for <a class="struct" href="https://doc.rust-lang.org/nightly/std/collections/hash/set/struct.Difference.html" title="struct std::collections::hash::set::Difference">Difference</a><'a, T, S></h3><code class="content"><span class="where fmt-newline">impl<'a, T, S> <a class="trait" href="https://doc.rust-lang.org/nightly/core/iter/iterator/trait.Iterator.html" title="trait core::iter::iterator::Iterator">Iterator</a> for <a class="struct" href="https://doc.rust-lang.org/nightly/std/collections/hash/set/struct.Difference.html" title="struct std::collections::hash::set::Difference">Difference</a><'a, T, S> <span class="where fmt-newline">where<br> S: <a class="trait" href="https://doc.rust-lang.org/nightly/core/hash/trait.BuildHasher.html" title="trait core::hash::BuildHasher">BuildHasher</a>,<br> T: <a class="trait" href="https://doc.rust-lang.org/nightly/core/cmp/trait.Eq.html" title="trait core::cmp::Eq">Eq</a> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/hash/trait.Hash.html" title="trait core::hash::Hash">Hash</a>, </span></span><span class="where fmt-newline"> type <a href='https://doc.rust-lang.org/nightly/core/iter/iterator/trait.Iterator.html#associatedtype.Item' class="type">Item</a> = <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&'a </a>T;</span></code></div></div><span id='difference.v' class='invisible'><code>pub fn <a href='#method.difference' class='fnname'>difference</a>(&'a self, other: &'a <a class="struct" href="https://doc.rust-lang.org/nightly/std/collections/hash/set/struct.HashSet.html" title="struct std::collections::hash::set::HashSet">HashSet</a><T, S>) -> <a class="struct" href="https://doc.rust-lang.org/nightly/std/collections/hash/set/struct.Difference.html" title="struct std::collections::hash::set::Difference">Difference</a><'a, T, S></code></span><span class='out-of-band'><div class='ghost'></div><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div><a class='srclink' href='https://doc.rust-lang.org/nightly/src/std/collections/hash/set.rs.html#340-345' title='goto source code'>[src]</a></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>.</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">HashSet</span>;
|
|||
|
|
<span class="kw">let</span> <span class="ident">a</span>: <span class="ident">HashSet</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="ident">b</span>: <span class="ident">HashSet</span><span class="op"><</span>_<span class="op">></span> <span class="op">=</span> [<span class="number">4</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="comment">// Can be seen as `a - b`.</span>
|
|||
|
|
<span class="kw">for</span> <span class="ident">x</span> <span class="kw">in</span> <span class="ident">a</span>.<span class="ident">difference</span>(<span class="kw-2">&</span><span class="ident">b</span>) {
|
|||
|
|
<span class="macro">println</span><span class="macro">!</span>(<span class="string">"{}"</span>, <span class="ident">x</span>); <span class="comment">// Print 1</span>
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
<span class="kw">let</span> <span class="ident">diff</span>: <span class="ident">HashSet</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">collect</span>();
|
|||
|
|
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">diff</span>, [<span class="number">1</span>].<span class="ident">iter</span>().<span class="ident">collect</span>());
|
|||
|
|
|
|||
|
|
<span class="comment">// Note that difference is not symmetric,</span>
|
|||
|
|
<span class="comment">// and `b - a` means something else:</span>
|
|||
|
|
<span class="kw">let</span> <span class="ident">diff</span>: <span class="ident">HashSet</span><span class="op"><</span>_<span class="op">></span> <span class="op">=</span> <span class="ident">b</span>.<span class="ident">difference</span>(<span class="kw-2">&</span><span class="ident">a</span>).<span class="ident">collect</span>();
|
|||
|
|
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">diff</span>, [<span class="number">4</span>].<span class="ident">iter</span>().<span class="ident">collect</span>());</pre>
|
|||
|
|
</div><h4 id='method.symmetric_difference' class="method"><div class="important-traits"><div class='tooltip'>ⓘ<span class='tooltiptext'>Important traits for <a class="struct" href="https://doc.rust-lang.org/nightly/std/collections/hash/set/struct.SymmetricDifference.html" title="struct std::collections::hash::set::SymmetricDifference">SymmetricDifference</a><'a, T, S></span></div><div class="content hidden"><h3 class="important">Important traits for <a class="struct" href="https://doc.rust-lang.org/nightly/std/collections/hash/set/struct.SymmetricDifference.html" title="struct std::collections::hash::set::SymmetricDifference">SymmetricDifference</a><'a, T, S></h3><code class="content"><span class="where fmt-newline">impl<'a, T, S> <a class="trait" href="https://doc.rust-lang.org/nightly/core/iter/iterator/trait.Iterator.html" title="trait core::iter::iterator::Iterator">Iterator</a> for <a class="struct" href="https://doc.rust-lang.org/nightly/std/collections/hash/set/struct.SymmetricDifference.html" title="struct std::collections::hash::set::SymmetricDifference">SymmetricDifference</a><'a, T, S> <span class="where fmt-newline">where<br> S: <a class="trait" href="https://doc.rust-lang.org/nightly/core/hash/trait.BuildHasher.html" title="trait core::hash::BuildHasher">BuildHasher</a>,<br> T: <a class="trait" href="https://doc.rust-lang.org/nightly/core/cmp/trait.Eq.html" title="trait core::cmp::Eq">Eq</a> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/hash/trait.Hash.html" title="trait core::hash::Hash">Hash</a>, </span></span><span class="where fmt-newline"> type <a href='https://doc.rust-lang.org/nightly/core/iter/iterator/trait.Iterator.html#associatedtype.Item' class="type">Item</a> = <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&'a </a>T;</span></code></div></div><span id='symmetric_difference.v' class='invisible'><code>pub fn <a href='#method.symmetric_difference' class='fnname'>symmetric_difference</a>(<br> &'a self, <br> other: &'a <a class="struct" href="https://doc.rust-lang.org/nightly/std/collections/hash/set/struct.HashSet.html" title="struct std::collections::hash::set::HashSet">HashSet</a><T, S><br>) -> <a class="struct" href="https://doc.rust-lang.org/nightly/std/collections/hash/set/struct.SymmetricDifference.html" title="struct std::collections::hash::set::SymmetricDifference">SymmetricDifference</a><'a, T, S></code></span><span class='out-of-band'><div class='ghost'></div><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div><a class='srclink' href='https://doc.rust-lang.org/nightly/src/std/collections/hash/set.rs.html#369-373' title='goto source code'>[src]</a></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.</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">HashSet</span>;
|
|||
|
|
<span class="kw">let</span> <span class="ident">a</span>: <span class="ident">HashSet</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="ident">b</span>: <span class="ident">HashSet</span><span class="op"><</span>_<span class="op">></span> <span class="op">=</span> [<span class="number">4</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="comment">// Print 1, 4 in arbitrary order.</span>
|
|||
|
|
<span class="kw">for</span> <span class="ident">x</span> <span class="kw">in</span> <span class="ident">a</span>.<span class="ident">symmetric_difference</span>(<span class="kw-2">&</span><span class="ident">b</span>) {
|
|||
|
|
<span class="macro">println</span><span class="macro">!</span>(<span class="string">"{}"</span>, <span class="ident">x</span>);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
<span class="kw">let</span> <span class="ident">diff1</span>: <span class="ident">HashSet</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">collect</span>();
|
|||
|
|
<span class="kw">let</span> <span class="ident">diff2</span>: <span class="ident">HashSet</span><span class="op"><</span>_<span class="op">></span> <span class="op">=</span> <span class="ident">b</span>.<span class="ident">symmetric_difference</span>(<span class="kw-2">&</span><span class="ident">a</span>).<span class="ident">collect</span>();
|
|||
|
|
|
|||
|
|
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">diff1</span>, <span class="ident">diff2</span>);
|
|||
|
|
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">diff1</span>, [<span class="number">1</span>, <span class="number">4</span>].<span class="ident">iter</span>().<span class="ident">collect</span>());</pre>
|
|||
|
|
</div><h4 id='method.intersection' class="method"><div class="important-traits"><div class='tooltip'>ⓘ<span class='tooltiptext'>Important traits for <a class="struct" href="https://doc.rust-lang.org/nightly/std/collections/hash/set/struct.Intersection.html" title="struct std::collections::hash::set::Intersection">Intersection</a><'a, T, S></span></div><div class="content hidden"><h3 class="important">Important traits for <a class="struct" href="https://doc.rust-lang.org/nightly/std/collections/hash/set/struct.Intersection.html" title="struct std::collections::hash::set::Intersection">Intersection</a><'a, T, S></h3><code class="content"><span class="where fmt-newline">impl<'a, T, S> <a class="trait" href="https://doc.rust-lang.org/nightly/core/iter/iterator/trait.Iterator.html" title="trait core::iter::iterator::Iterator">Iterator</a> for <a class="struct" href="https://doc.rust-lang.org/nightly/std/collections/hash/set/struct.Intersection.html" title="struct std::collections::hash::set::Intersection">Intersection</a><'a, T, S> <span class="where fmt-newline">where<br> S: <a class="trait" href="https://doc.rust-lang.org/nightly/core/hash/trait.BuildHasher.html" title="trait core::hash::BuildHasher">BuildHasher</a>,<br> T: <a class="trait" href="https://doc.rust-lang.org/nightly/core/cmp/trait.Eq.html" title="trait core::cmp::Eq">Eq</a> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/hash/trait.Hash.html" title="trait core::hash::Hash">Hash</a>, </span></span><span class="where fmt-newline"> type <a href='https://doc.rust-lang.org/nightly/core/iter/iterator/trait.Iterator.html#associatedtype.Item' class="type">Item</a> = <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&'a </a>T;</span></code></div></div><span id='intersection.v' class='invisible'><code>pub fn <a href='#method.intersection' class='fnname'>intersection</a>(<br> &'a self, <br> other: &'a <a class="struct" href="https://doc.rust-lang.org/nightly/std/collections/hash/set/struct.HashSet.html" title="struct std::collections::hash::set::HashSet">HashSet</a><T, S><br>) -> <a class="struct" href="https://doc.rust-lang.org/nightly/std/collections/hash/set/struct.Intersection.html" title="struct std::collections::hash::set::Intersection">Intersection</a><'a, T, S></code></span><span class='out-of-band'><div class='ghost'></div><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div><a class='srclink' href='https://doc.rust-lang.org/nightly/src/std/collections/hash/set.rs.html#394-399' title='goto source code'>[src]</a></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>.</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">HashSet</span>;
|
|||
|
|
<span class="kw">let</span> <span class="ident">a</span>: <span class="ident">HashSet</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="ident">b</span>: <span class="ident">HashSet</span><span class="op"><</span>_<span class="op">></span> <span class="op">=</span> [<span class="number">4</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="comment">// Print 2, 3 in arbitrary order.</span>
|
|||
|
|
<span class="kw">for</span> <span class="ident">x</span> <span class="kw">in</span> <span class="ident">a</span>.<span class="ident">intersection</span>(<span class="kw-2">&</span><span class="ident">b</span>) {
|
|||
|
|
<span class="macro">println</span><span class="macro">!</span>(<span class="string">"{}"</span>, <span class="ident">x</span>);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
<span class="kw">let</span> <span class="ident">intersection</span>: <span class="ident">HashSet</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">collect</span>();
|
|||
|
|
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">intersection</span>, [<span class="number">2</span>, <span class="number">3</span>].<span class="ident">iter</span>().<span class="ident">collect</span>());</pre>
|
|||
|
|
</div><h4 id='method.union' class="method"><div class="important-traits"><div class='tooltip'>ⓘ<span class='tooltiptext'>Important traits for <a class="struct" href="https://doc.rust-lang.org/nightly/std/collections/hash/set/struct.Union.html" title="struct std::collections::hash::set::Union">Union</a><'a, T, S></span></div><div class="content hidden"><h3 class="important">Important traits for <a class="struct" href="https://doc.rust-lang.org/nightly/std/collections/hash/set/struct.Union.html" title="struct std::collections::hash::set::Union">Union</a><'a, T, S></h3><code class="content"><span class="where fmt-newline">impl<'a, T, S> <a class="trait" href="https://doc.rust-lang.org/nightly/core/iter/iterator/trait.Iterator.html" title="trait core::iter::iterator::Iterator">Iterator</a> for <a class="struct" href="https://doc.rust-lang.org/nightly/std/collections/hash/set/struct.Union.html" title="struct std::collections::hash::set::Union">Union</a><'a, T, S> <span class="where fmt-newline">where<br> S: <a class="trait" href="https://doc.rust-lang.org/nightly/core/hash/trait.BuildHasher.html" title="trait core::hash::BuildHasher">BuildHasher</a>,<br> T: <a class="trait" href="https://doc.rust-lang.org/nightly/core/cmp/trait.Eq.html" title="trait core::cmp::Eq">Eq</a> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/hash/trait.Hash.html" title="trait core::hash::Hash">Hash</a>, </span></span><span class="where fmt-newline"> type <a href='https://doc.rust-lang.org/nightly/core/iter/iterator/trait.Iterator.html#associatedtype.Item' class="type">Item</a> = <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&'a </a>T;</span></code></div></div><span id='union.v' class='invisible'><code>pub fn <a href='#method.union' class='fnname'>union</a>(&'a self, other: &'a <a class="struct" href="https://doc.rust-lang.org/nightly/std/collections/hash/set/struct.HashSet.html" title="struct std::collections::hash::set::HashSet">HashSet</a><T, S>) -> <a class="struct" href="https://doc.rust-lang.org/nightly/std/collections/hash/set/struct.Union.html" title="struct std::collections::hash::set::Union">Union</a><'a, T, S></code></span><span class='out-of-band'><div class='ghost'></div><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div><a class='srclink' href='https://doc.rust-lang.org/nightly/src/std/collections/hash/set.rs.html#420-422' title='goto source code'>[src]</a></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.</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">HashSet</span>;
|
|||
|
|
<span class="kw">let</span> <span class="ident">a</span>: <span class="ident">HashSet</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="ident">b</span>: <span class="ident">HashSet</span><span class="op"><</span>_<span class="op">></span> <span class="op">=</span> [<span class="number">4</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="comment">// Print 1, 2, 3, 4 in arbitrary order.</span>
|
|||
|
|
<span class="kw">for</span> <span class="ident">x</span> <span class="kw">in</span> <span class="ident">a</span>.<span class="ident">union</span>(<span class="kw-2">&</span><span class="ident">b</span>) {
|
|||
|
|
<span class="macro">println</span><span class="macro">!</span>(<span class="string">"{}"</span>, <span class="ident">x</span>);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
<span class="kw">let</span> <span class="ident">union</span>: <span class="ident">HashSet</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">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>, <span class="number">3</span>, <span class="number">4</span>].<span class="ident">iter</span>().<span class="ident">collect</span>());</pre>
|
|||
|
|
</div><h4 id='method.len' class="method"><span id='len.v' class='invisible'><code>pub fn <a href='#method.len' class='fnname'>len</a>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a></code></span><span class='out-of-band'><div class='ghost'></div><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div><a class='srclink' href='https://doc.rust-lang.org/nightly/src/std/collections/hash/set.rs.html#437-439' title='goto source code'>[src]</a></span></h4>
|
|||
|
|
<div class='docblock'><p>Returns the number of elements in the set.</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">HashSet</span>;
|
|||
|
|
|
|||
|
|
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">v</span> <span class="op">=</span> <span class="ident">HashSet</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>);</pre>
|
|||
|
|
</div><h4 id='method.is_empty' class="method"><span id='is_empty.v' class='invisible'><code>pub fn <a href='#method.is_empty' class='fnname'>is_empty</a>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a></code></span><span class='out-of-band'><div class='ghost'></div><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div><a class='srclink' href='https://doc.rust-lang.org/nightly/src/std/collections/hash/set.rs.html#454-456' title='goto source code'>[src]</a></span></h4>
|
|||
|
|
<div class='docblock'><p>Returns true if the set contains no elements.</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">HashSet</span>;
|
|||
|
|
|
|||
|
|
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">v</span> <span class="op">=</span> <span class="ident">HashSet</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>());</pre>
|
|||
|
|
</div><h4 id='method.drain' class="method"><div class="important-traits"><div class='tooltip'>ⓘ<span class='tooltiptext'>Important traits for <a class="struct" href="https://doc.rust-lang.org/nightly/std/collections/hash/set/struct.Drain.html" title="struct std::collections::hash::set::Drain">Drain</a><'a, K></span></div><div class="content hidden"><h3 class="important">Important traits for <a class="struct" href="https://doc.rust-lang.org/nightly/std/collections/hash/set/struct.Drain.html" title="struct std::collections::hash::set::Drain">Drain</a><'a, K></h3><code class="content"><span class="where fmt-newline">impl<'a, K> <a class="trait" href="https://doc.rust-lang.org/nightly/core/iter/iterator/trait.Iterator.html" title="trait core::iter::iterator::Iterator">Iterator</a> for <a class="struct" href="https://doc.rust-lang.org/nightly/std/collections/hash/set/struct.Drain.html" title="struct std::collections::hash::set::Drain">Drain</a><'a, K></span><span class="where fmt-newline"> type <a href='https://doc.rust-lang.org/nightly/core/iter/iterator/trait.Iterator.html#associatedtype.Item' class="type">Item</a> = K;</span></code></div></div><span id='drain.v' class='invisible'><code>pub fn <a href='#method.drain' class='fnname'>drain</a>(&mut self) -> <a class="struct" href="https://doc.rust-lang.org/nightly/std/collections/hash/set/struct.Drain.html" title="struct std::collections::hash::set::Drain">Drain</a><T></code></span><span class='out-of-band'><div class='ghost'></div><div class='since' title='Stable since Rust version 1.6.0'>1.6.0</div><a class='srclink' href='https://doc.rust-lang.org/nightly/src/std/collections/hash/set.rs.html#477-479' title='goto source code'>[src]</a></span></h4>
|
|||
|
|
<div class='docblock'><p>Clears the set, returning all elements in an iterator.</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">HashSet</span>;
|
|||
|
|
|
|||
|
|
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">set</span>: <span class="ident">HashSet</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</span><span class="macro">!</span>(<span class="op">!</span><span class="ident">set</span>.<span class="ident">is_empty</span>());
|
|||
|
|
|
|||
|
|
<span class="comment">// print 1, 2, 3 in an arbitrary order</span>
|
|||
|
|
<span class="kw">for</span> <span class="ident">i</span> <span class="kw">in</span> <span class="ident">set</span>.<span class="ident">drain</span>() {
|
|||
|
|
<span class="macro">println</span><span class="macro">!</span>(<span class="string">"{}"</span>, <span class="ident">i</span>);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">set</span>.<span class="ident">is_empty</span>());</pre>
|
|||
|
|
</div><h4 id='method.clear' class="method"><span id='clear.v' class='invisible'><code>pub fn <a href='#method.clear' class='fnname'>clear</a>(&mut self)</code></span><span class='out-of-band'><div class='ghost'></div><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div><a class='srclink' href='https://doc.rust-lang.org/nightly/src/std/collections/hash/set.rs.html#494-496' title='goto source code'>[src]</a></span></h4>
|
|||
|
|
<div class='docblock'><p>Clears the set, removing all values.</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">HashSet</span>;
|
|||
|
|
|
|||
|
|
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">v</span> <span class="op">=</span> <span class="ident">HashSet</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>());</pre>
|
|||
|
|
</div><h4 id='method.contains' class="method"><span id='contains.v' class='invisible'><code>pub fn <a href='#method.contains' class='fnname'>contains</a><Q>(&self, value: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&</a>Q) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a> <span class="where fmt-newline">where<br> Q: <a class="trait" href="https://doc.rust-lang.org/nightly/core/hash/trait.Hash.html" title="trait core::hash::Hash">Hash</a> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/cmp/trait.Eq.html" title="trait core::cmp::Eq">Eq</a> + ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> T: <a class="trait" href="https://doc.rust-lang.org/nightly/core/borrow/trait.Borrow.html" title="trait core::borrow::Borrow">Borrow</a><Q>, </span></code></span><span class='out-of-band'><div class='ghost'></div><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div><a class='srclink' href='https://doc.rust-lang.org/nightly/src/std/collections/hash/set.rs.html#517-522' title='goto source code'>[src]</a></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
|
|||
|
|
<a href="../../std/hash/trait.Hash.html"><code>Hash</code></a> and <a href="../../std/cmp/trait.Eq.html"><code>Eq</code></a> on the borrowed form <em>must</em> match those for
|
|||
|
|
the value type.</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">HashSet</span>;
|
|||
|
|
|
|||
|
|
<span class="kw">let</span> <span class="ident">set</span>: <span class="ident">HashSet</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>);</pre>
|
|||
|
|
</div><h4 id='method.get' class="method"><span id='get.v' class='invisible'><code>pub fn <a href='#method.get' class='fnname'>get</a><Q>(&self, value: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&</a>Q) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&</a>T> <span class="where fmt-newline">where<br> Q: <a class="trait" href="https://doc.rust-lang.org/nightly/core/hash/trait.Hash.html" title="trait core::hash::Hash">Hash</a> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/cmp/trait.Eq.html" title="trait core::cmp::Eq">Eq</a> + ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> T: <a class="trait" href="https://doc.rust-lang.org/nightly/core/borrow/trait.Borrow.html" title="trait core::borrow::Borrow">Borrow</a><Q>, </span></code></span><span class='out-of-band'><div class='ghost'></div><div class='since' title='Stable since Rust version 1.9.0'>1.9.0</div><a class='srclink' href='https://doc.rust-lang.org/nightly/src/std/collections/hash/set.rs.html#543-548' title='goto source code'>[src]</a></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
|
|||
|
|
<a href="../../std/hash/trait.Hash.html"><code>Hash</code></a> and <a href="../../std/cmp/trait.Eq.html"><code>Eq</code></a> on the borrowed form <em>must</em> match those for
|
|||
|
|
the value type.</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">HashSet</span>;
|
|||
|
|
|
|||
|
|
<span class="kw">let</span> <span class="ident">set</span>: <span class="ident">HashSet</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">get</span>(<span class="kw-2">&</span><span class="number">2</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</span>.<span class="ident">get</span>(<span class="kw-2">&</span><span class="number">4</span>), <span class="prelude-val">None</span>);</pre>
|
|||
|
|
</div><h4 id='method.is_disjoint' class="method"><span id='is_disjoint.v' class='invisible'><code>pub fn <a href='#method.is_disjoint' class='fnname'>is_disjoint</a>(&self, other: &<a class="struct" href="https://doc.rust-lang.org/nightly/std/collections/hash/set/struct.HashSet.html" title="struct std::collections::hash::set::HashSet">HashSet</a><T, S>) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a></code></span><span class='out-of-band'><div class='ghost'></div><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div><a class='srclink' href='https://doc.rust-lang.org/nightly/src/std/collections/hash/set.rs.html#568-570' title='goto source code'>[src]</a></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-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">HashSet</span>;
|
|||
|
|
|
|||
|
|
<span class="kw">let</span> <span class="ident">a</span>: <span class="ident">HashSet</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">HashSet</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>);</pre>
|
|||
|
|
</div><h4 id='method.is_subset' class="method"><span id='is_subset.v' class='invisible'><code>pub fn <a href='#method.is_subset' class='fnname'>is_subset</a>(&self, other: &<a class="struct" href="https://doc.rust-lang.org/nightly/std/collections/hash/set/struct.HashSet.html" title="struct std::collections::hash::set::HashSet">HashSet</a><T, S>) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a></code></span><span class='out-of-band'><div class='ghost'></div><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div><a class='srclink' href='https://doc.rust-lang.org/nightly/src/std/collections/hash/set.rs.html#590-592' title='goto source code'>[src]</a></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-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">HashSet</span>;
|
|||
|
|
|
|||
|
|
<span class="kw">let</span> <span class="ident">sup</span>: <span class="ident">HashSet</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">HashSet</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>);</pre>
|
|||
|
|
</div><h4 id='method.is_superset' class="method"><span id='is_superset.v' class='invisible'><code>pub fn <a href='#method.is_superset' class='fnname'>is_superset</a>(&self, other: &<a class="struct" href="https://doc.rust-lang.org/nightly/std/collections/hash/set/struct.HashSet.html" title="struct std::collections::hash::set::HashSet">HashSet</a><T, S>) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a></code></span><span class='out-of-band'><div class='ghost'></div><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div><a class='srclink' href='https://doc.rust-lang.org/nightly/src/std/collections/hash/set.rs.html#616-618' title='goto source code'>[src]</a></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-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">HashSet</span>;
|
|||
|
|
|
|||
|
|
<span class="kw">let</span> <span class="ident">sub</span>: <span class="ident">HashSet</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">HashSet</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>);</pre>
|
|||
|
|
</div><h4 id='method.insert' class="method"><span id='insert.v' class='invisible'><code>pub fn <a href='#method.insert' class='fnname'>insert</a>(&mut self, value: T) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a></code></span><span class='out-of-band'><div class='ghost'></div><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div><a class='srclink' href='https://doc.rust-lang.org/nightly/src/std/collections/hash/set.rs.html#638-640' title='goto source code'>[src]</a></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.</p>
|
|||
|
|
<h1 id="examples-18" class="section-header"><a href="#examples-18">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">HashSet</span>;
|
|||
|
|
|
|||
|
|
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">set</span> <span class="op">=</span> <span class="ident">HashSet</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>);</pre>
|
|||
|
|
</div><h4 id='method.replace' class="method"><span id='replace.v' class='invisible'><code>pub fn <a href='#method.replace' class='fnname'>replace</a>(&mut self, value: T) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><T></code></span><span class='out-of-band'><div class='ghost'></div><div class='since' title='Stable since Rust version 1.9.0'>1.9.0</div><a class='srclink' href='https://doc.rust-lang.org/nightly/src/std/collections/hash/set.rs.html#658-660' title='goto source code'>[src]</a></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>
|
|||
|
|
<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">HashSet</span>;
|
|||
|
|
|
|||
|
|
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">set</span> <span class="op">=</span> <span class="ident">HashSet</span>::<span class="ident">new</span>();
|
|||
|
|
<span class="ident">set</span>.<span class="ident">insert</span>(<span class="ident">Vec</span>::<span class="op"><</span><span class="ident">i32</span><span class="op">></span>::<span class="ident">new</span>());
|
|||
|
|
|
|||
|
|
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">set</span>.<span class="ident">get</span>(<span class="kw-2">&</span>[][..]).<span class="ident">unwrap</span>().<span class="ident">capacity</span>(), <span class="number">0</span>);
|
|||
|
|
<span class="ident">set</span>.<span class="ident">replace</span>(<span class="ident">Vec</span>::<span class="ident">with_capacity</span>(<span class="number">10</span>));
|
|||
|
|
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">set</span>.<span class="ident">get</span>(<span class="kw-2">&</span>[][..]).<span class="ident">unwrap</span>().<span class="ident">capacity</span>(), <span class="number">10</span>);</pre>
|
|||
|
|
</div><h4 id='method.remove' class="method"><span id='remove.v' class='invisible'><code>pub fn <a href='#method.remove' class='fnname'>remove</a><Q>(&mut self, value: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&</a>Q) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a> <span class="where fmt-newline">where<br> Q: <a class="trait" href="https://doc.rust-lang.org/nightly/core/hash/trait.Hash.html" title="trait core::hash::Hash">Hash</a> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/cmp/trait.Eq.html" title="trait core::cmp::Eq">Eq</a> + ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> T: <a class="trait" href="https://doc.rust-lang.org/nightly/core/borrow/trait.Borrow.html" title="trait core::borrow::Borrow">Borrow</a><Q>, </span></code></span><span class='out-of-band'><div class='ghost'></div><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div><a class='srclink' href='https://doc.rust-lang.org/nightly/src/std/collections/hash/set.rs.html#684-689' title='goto source code'>[src]</a></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
|
|||
|
|
<a href="../../std/hash/trait.Hash.html"><code>Hash</code></a> and <a href="../../std/cmp/trait.Eq.html"><code>Eq</code></a> on the borrowed form <em>must</em> match those for
|
|||
|
|
the value type.</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">HashSet</span>;
|
|||
|
|
|
|||
|
|
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">set</span> <span class="op">=</span> <span class="ident">HashSet</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>);</pre>
|
|||
|
|
</div><h4 id='method.take' class="method"><span id='take.v' class='invisible'><code>pub fn <a href='#method.take' class='fnname'>take</a><Q>(&mut self, value: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&</a>Q) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><T> <span class="where fmt-newline">where<br> Q: <a class="trait" href="https://doc.rust-lang.org/nightly/core/hash/trait.Hash.html" title="trait core::hash::Hash">Hash</a> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/cmp/trait.Eq.html" title="trait core::cmp::Eq">Eq</a> + ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,<br> T: <a class="trait" href="https://doc.rust-lang.org/nightly/core/borrow/trait.Borrow.html" title="trait core::borrow::Borrow">Borrow</a><Q>, </span></code></span><span class='out-of-band'><div class='ghost'></div><div class='since' title='Stable since Rust version 1.9.0'>1.9.0</div><a class='srclink' href='https://doc.rust-lang.org/nightly/src/std/collections/hash/set.rs.html#710-715' title='goto source code'>[src]</a></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
|
|||
|
|
<a href="../../std/hash/trait.Hash.html"><code>Hash</code></a> and <a href="../../std/cmp/trait.Eq.html"><code>Eq</code></a> on the borrowed form <em>must</em> match those for
|
|||
|
|
the value type.</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">HashSet</span>;
|
|||
|
|
|
|||
|
|
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">set</span>: <span class="ident">HashSet</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">take</span>(<span class="kw-2">&</span><span class="number">2</span>), <span class="prelude-val">Some</span>(<span class="number">2</span>));
|
|||
|
|
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">set</span>.<span class="ident">take</span>(<span class="kw-2">&</span><span class="number">2</span>), <span class="prelude-val">None</span>);</pre>
|
|||
|
|
</div><h4 id='method.retain' class="method"><span id='retain.v' class='invisible'><code>pub fn <a href='#method.retain' class='fnname'>retain</a><F>(&mut self, f: F) <span class="where fmt-newline">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnMut.html" title="trait core::ops::function::FnMut">FnMut</a>(<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&</a>T) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a>, </span></code></span><span class='out-of-band'><div class='ghost'></div><div class='since' title='Stable since Rust version 1.18.0'>1.18.0</div><a class='srclink' href='https://doc.rust-lang.org/nightly/src/std/collections/hash/set.rs.html#732-736' title='goto source code'>[src]</a></span></h4>
|
|||
|
|
<div class='docblock'><p>Retains only the elements specified by the predicate.</p>
|
|||
|
|
<p>In other words, remove all elements <code>e</code> such that <code>f(&e)</code> returns <code>false</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">HashSet</span>;
|
|||
|
|
|
|||
|
|
<span class="kw">let</span> <span class="ident">xs</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="number">5</span>,<span class="number">6</span>];
|
|||
|
|
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">set</span>: <span class="ident">HashSet</span><span class="op"><</span><span class="ident">isize</span><span class="op">></span> <span class="op">=</span> <span class="ident">xs</span>.<span class="ident">iter</span>().<span class="ident">cloned</span>().<span class="ident">collect</span>();
|
|||
|
|
<span class="ident">set</span>.<span class="ident">retain</span>(<span class="op">|</span><span class="kw-2">&</span><span class="ident">k</span><span class="op">|</span> <span class="ident">k</span> <span class="op">%</span> <span class="number">2</span> <span class="op">==</span> <span class="number">0</span>);
|
|||
|
|
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">set</span>.<span class="ident">len</span>(), <span class="number">3</span>);</pre>
|
|||
|
|
</div></div>
|
|||
|
|
<h2 id='implementations' class='small-section-header'>
|
|||
|
|
Trait Implementations<a href='#implementations' class='anchor'></a>
|
|||
|
|
</h2>
|
|||
|
|
<h3 id='impl-Clone' class='impl'><span class='in-band'><code>impl<T: <a class="trait" href="https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a>> <a class="trait" href="https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a> for <a class="struct" href="../../edn/intern_set/struct.InternSet.html" title="struct edn::intern_set::InternSet">InternSet</a><T> <span class="where fmt-newline">where<br> T: <a class="trait" href="https://doc.rust-lang.org/nightly/core/cmp/trait.Eq.html" title="trait core::cmp::Eq">Eq</a> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/hash/trait.Hash.html" title="trait core::hash::Hash">Hash</a>, </span></code><a href='#impl-Clone' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/edn/intern_set.rs.html#31' 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='https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html#tymethod.clone' class='fnname'>clone</a>(&self) -> <a class="struct" href="../../edn/intern_set/struct.InternSet.html" title="struct edn::intern_set::InternSet">InternSet</a><T></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/edn/intern_set.rs.html#31' title='goto source code'>[src]</a></span></h4>
|
|||
|
|
<div class='docblock'><p>Returns a copy of the value. <a href="https://doc.rust-lang.org/nightly/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='https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html#method.clone_from' class='fnname'>clone_from</a>(&mut self, source: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&</a>Self)</code></span><span class='out-of-band'><div class='ghost'></div><div class='since' title='Stable since Rust version 1.0.0'>1.0.0</div><a class='srclink' href='https://doc.rust-lang.org/nightly/src/core/clone.rs.html#112-114' title='goto source code'>[src]</a></span></h4>
|
|||
|
|
<div class='docblock'><p>Performs copy-assignment from <code>source</code>. <a href="https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html#method.clone_from">Read more</a></p>
|
|||
|
|
</div></div><h3 id='impl-Debug' class='impl'><span class='in-band'><code>impl<T: <a class="trait" href="https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a>> <a class="trait" href="https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a> for <a class="struct" href="../../edn/intern_set/struct.InternSet.html" title="struct edn::intern_set::InternSet">InternSet</a><T> <span class="where fmt-newline">where<br> T: <a class="trait" href="https://doc.rust-lang.org/nightly/core/cmp/trait.Eq.html" title="trait core::cmp::Eq">Eq</a> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/hash/trait.Hash.html" title="trait core::hash::Hash">Hash</a>, </span></code><a href='#impl-Debug' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/edn/intern_set.rs.html#31' 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='https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html#tymethod.fmt' class='fnname'>fmt</a>(&self, __arg_0: &mut <a class="struct" href="https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a>) -> <a class="type" href="https://doc.rust-lang.org/nightly/core/fmt/type.Result.html" title="type core::fmt::Result">Result</a></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/edn/intern_set.rs.html#31' title='goto source code'>[src]</a></span></h4>
|
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<div class='docblock'><p>Formats the value using the given formatter. <a href="https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html#tymethod.fmt">Read more</a></p>
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</div></div><h3 id='impl-Default' class='impl'><span class='in-band'><code>impl<T: <a class="trait" href="https://doc.rust-lang.org/nightly/core/default/trait.Default.html" title="trait core::default::Default">Default</a>> <a class="trait" href="https://doc.rust-lang.org/nightly/core/default/trait.Default.html" title="trait core::default::Default">Default</a> for <a class="struct" href="../../edn/intern_set/struct.InternSet.html" title="struct edn::intern_set::InternSet">InternSet</a><T> <span class="where fmt-newline">where<br> T: <a class="trait" href="https://doc.rust-lang.org/nightly/core/cmp/trait.Eq.html" title="trait core::cmp::Eq">Eq</a> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/hash/trait.Hash.html" title="trait core::hash::Hash">Hash</a>, </span></code><a href='#impl-Default' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/edn/intern_set.rs.html#31' title='goto source code'>[src]</a></span></h3>
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<div class='impl-items'><h4 id='method.default' class="method"><span id='default.v' class='invisible'><code>fn <a href='https://doc.rust-lang.org/nightly/core/default/trait.Default.html#tymethod.default' class='fnname'>default</a>() -> <a class="struct" href="../../edn/intern_set/struct.InternSet.html" title="struct edn::intern_set::InternSet">InternSet</a><T></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/edn/intern_set.rs.html#31' title='goto source code'>[src]</a></span></h4>
|
|||
|
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<div class='docblock'><p>Returns the "default value" for a type. <a href="https://doc.rust-lang.org/nightly/core/default/trait.Default.html#tymethod.default">Read more</a></p>
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</div></div><h3 id='impl-Eq' class='impl'><span class='in-band'><code>impl<T: <a class="trait" href="https://doc.rust-lang.org/nightly/core/cmp/trait.Eq.html" title="trait core::cmp::Eq">Eq</a>> <a class="trait" href="https://doc.rust-lang.org/nightly/core/cmp/trait.Eq.html" title="trait core::cmp::Eq">Eq</a> for <a class="struct" href="../../edn/intern_set/struct.InternSet.html" title="struct edn::intern_set::InternSet">InternSet</a><T> <span class="where fmt-newline">where<br> T: <a class="trait" href="https://doc.rust-lang.org/nightly/core/cmp/trait.Eq.html" title="trait core::cmp::Eq">Eq</a> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/hash/trait.Hash.html" title="trait core::hash::Hash">Hash</a>, </span></code><a href='#impl-Eq' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/edn/intern_set.rs.html#31' title='goto source code'>[src]</a></span></h3>
|
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<div class='impl-items'></div><h3 id='impl-PartialEq' class='impl'><span class='in-band'><code>impl<T: <a class="trait" href="https://doc.rust-lang.org/nightly/core/cmp/trait.PartialEq.html" title="trait core::cmp::PartialEq">PartialEq</a>> <a class="trait" href="https://doc.rust-lang.org/nightly/core/cmp/trait.PartialEq.html" title="trait core::cmp::PartialEq">PartialEq</a> for <a class="struct" href="../../edn/intern_set/struct.InternSet.html" title="struct edn::intern_set::InternSet">InternSet</a><T> <span class="where fmt-newline">where<br> T: <a class="trait" href="https://doc.rust-lang.org/nightly/core/cmp/trait.Eq.html" title="trait core::cmp::Eq">Eq</a> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/hash/trait.Hash.html" title="trait core::hash::Hash">Hash</a>, </span></code><a href='#impl-PartialEq' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/edn/intern_set.rs.html#31' title='goto source code'>[src]</a></span></h3>
|
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<div class='impl-items'><h4 id='method.eq' class="method"><span id='eq.v' class='invisible'><code>fn <a href='https://doc.rust-lang.org/nightly/core/cmp/trait.PartialEq.html#tymethod.eq' class='fnname'>eq</a>(&self, __arg_0: &<a class="struct" href="../../edn/intern_set/struct.InternSet.html" title="struct edn::intern_set::InternSet">InternSet</a><T>) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/edn/intern_set.rs.html#31' title='goto source code'>[src]</a></span></h4>
|
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|
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<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="https://doc.rust-lang.org/nightly/core/cmp/trait.PartialEq.html#tymethod.eq">Read more</a></p>
|
|||
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</div><h4 id='method.ne' class="method"><span id='ne.v' class='invisible'><code>fn <a href='https://doc.rust-lang.org/nightly/core/cmp/trait.PartialEq.html#method.ne' class='fnname'>ne</a>(&self, __arg_0: &<a class="struct" href="../../edn/intern_set/struct.InternSet.html" title="struct edn::intern_set::InternSet">InternSet</a><T>) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/edn/intern_set.rs.html#31' title='goto source code'>[src]</a></span></h4>
|
|||
|
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<div class='docblock'><p>This method tests for <code>!=</code>.</p>
|
|||
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</div></div><h3 id='impl-Deref' class='impl'><span class='in-band'><code>impl<T> <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/deref/trait.Deref.html" title="trait core::ops::deref::Deref">Deref</a> for <a class="struct" href="../../edn/intern_set/struct.InternSet.html" title="struct edn::intern_set::InternSet">InternSet</a><T> <span class="where fmt-newline">where<br> T: <a class="trait" href="https://doc.rust-lang.org/nightly/core/cmp/trait.Eq.html" title="trait core::cmp::Eq">Eq</a> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/hash/trait.Hash.html" title="trait core::hash::Hash">Hash</a>, </span></code><a href='#impl-Deref' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/edn/intern_set.rs.html#36-42' title='goto source code'>[src]</a></span></h3>
|
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<div class='impl-items'><h4 id='associatedtype.Target' class="type"><span id='Target.t' class='invisible'><code>type <a href='https://doc.rust-lang.org/nightly/core/ops/deref/trait.Deref.html#associatedtype.Target' class="type">Target</a> = <a class="struct" href="https://doc.rust-lang.org/nightly/std/collections/hash/set/struct.HashSet.html" title="struct std::collections::hash::set::HashSet">HashSet</a><<a class="type" href="../../edn/value_rc/type.ValueRc.html" title="type edn::value_rc::ValueRc">ValueRc</a><T>></code></span></h4>
|
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<div class='docblock'><p>The resulting type after dereferencing.</p>
|
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</div><h4 id='method.deref' class="method"><span id='deref.v' class='invisible'><code>fn <a href='https://doc.rust-lang.org/nightly/core/ops/deref/trait.Deref.html#tymethod.deref' class='fnname'>deref</a>(&self) -> &Self::<a class="type" href="https://doc.rust-lang.org/nightly/core/ops/deref/trait.Deref.html#associatedtype.Target" title="type core::ops::deref::Deref::Target">Target</a></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/edn/intern_set.rs.html#39-41' title='goto source code'>[src]</a></span></h4>
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<div class='docblock'><p>Dereferences the value.</p>
|
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</div></div><h3 id='impl-DerefMut' class='impl'><span class='in-band'><code>impl<T> <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/deref/trait.DerefMut.html" title="trait core::ops::deref::DerefMut">DerefMut</a> for <a class="struct" href="../../edn/intern_set/struct.InternSet.html" title="struct edn::intern_set::InternSet">InternSet</a><T> <span class="where fmt-newline">where<br> T: <a class="trait" href="https://doc.rust-lang.org/nightly/core/cmp/trait.Eq.html" title="trait core::cmp::Eq">Eq</a> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/hash/trait.Hash.html" title="trait core::hash::Hash">Hash</a>, </span></code><a href='#impl-DerefMut' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/edn/intern_set.rs.html#44-48' title='goto source code'>[src]</a></span></h3>
|
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<div class='impl-items'><h4 id='method.deref_mut' class="method"><span id='deref_mut.v' class='invisible'><code>fn <a href='https://doc.rust-lang.org/nightly/core/ops/deref/trait.DerefMut.html#tymethod.deref_mut' class='fnname'>deref_mut</a>(&mut self) -> &mut Self::<a class="type" href="https://doc.rust-lang.org/nightly/core/ops/deref/trait.Deref.html#associatedtype.Target" title="type core::ops::deref::Deref::Target">Target</a></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/edn/intern_set.rs.html#45-47' title='goto source code'>[src]</a></span></h4>
|
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|
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<div class='docblock'><p>Mutably dereferences the value.</p>
|
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