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<section id='main' class="content struct">
<h1 class='fqn'><span class='in-band'>Struct <a href='index.html'>regex_syntax</a>::<wbr><a class='struct' href=''>CharClass</a></span><span class='out-of-band'><span id='render-detail'>
<a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">
[<span class='inner'>&#x2212;</span>]
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</span><a id='src-1378' class='srclink' href='../src/regex_syntax/lib.rs.html#239-241' title='goto source code'>[src]</a></span></h1>
<pre class='rust struct'>pub struct CharClass {
// some fields omitted
}</pre><div class='docblock'><p>A character class.</p>
<p>A character class has a canonical format that the parser guarantees. Its
canonical format is defined by the following invariants:</p>
<ol>
<li>Given any Unicode scalar value, it is matched by <em>at most</em> one character
range in a canonical character class.</li>
<li>Every adjacent character range is separated by at least one Unicode
scalar value.</li>
<li>Given any pair of character ranges <code>r1</code> and <code>r2</code>, if
<code>r1.end &lt; r2.start</code>, then <code>r1</code> comes before <code>r2</code> in a canonical
character class.</li>
</ol>
<p>In sum, any <code>CharClass</code> produced by this crate&#39;s parser is a sorted
sequence of non-overlapping ranges. This makes it possible to test whether
a character is matched by a class with a binary search.</p>
<p>If the case insensitive flag was set when parsing a character class, then
simple case folding is done automatically. For example, <code>(?i)[a-c]</code> is
automatically translated to <code>[a-cA-C]</code>.</p>
</div><h2 id='methods'>Methods</h2><h3 class='impl'><code>impl <a class='struct' href='../regex_syntax/struct.CharClass.html' title='regex_syntax::CharClass'>CharClass</a></code></h3><div class='impl-items'><h4 id='method.new' class='method'><code>fn <a href='#method.new' class='fnname'>new</a>(ranges: <a class='struct' href='https://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html' title='collections::vec::Vec'>Vec</a>&lt;<a class='struct' href='../regex_syntax/struct.ClassRange.html' title='regex_syntax::ClassRange'>ClassRange</a>&gt;) -&gt; <a class='struct' href='../regex_syntax/struct.CharClass.html' title='regex_syntax::CharClass'>CharClass</a></code></h4>
<div class='docblock'><p>Create a new class from an existing set of ranges.</p>
</div><h4 id='method.matches' class='method'><code>fn <a href='#method.matches' class='fnname'>matches</a>(&amp;self, c: <a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.char.html'>char</a>) -&gt; <a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.bool.html'>bool</a></code></h4>
<div class='docblock'><p>Returns true if <code>c</code> is matched by this character class.</p>
</div><h4 id='method.remove' class='method'><code>fn <a href='#method.remove' class='fnname'>remove</a>(&amp;mut self, c: <a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.char.html'>char</a>)</code></h4>
<div class='docblock'><p>Removes the given character from the class if it exists.</p>
<p>Note that this takes <code>O(n)</code> time in the number of ranges.</p>
</div><h4 id='method.negate' class='method'><code>fn <a href='#method.negate' class='fnname'>negate</a>(self) -&gt; <a class='struct' href='../regex_syntax/struct.CharClass.html' title='regex_syntax::CharClass'>CharClass</a></code></h4>
<div class='docblock'><p>Negates the character class.</p>
<p>For all <code>c</code> where <code>c</code> is a Unicode scalar value, <code>c</code> matches <code>self</code>
if and only if <code>c</code> does not match <code>self.negate()</code>.</p>
</div><h4 id='method.case_fold' class='method'><code>fn <a href='#method.case_fold' class='fnname'>case_fold</a>(self) -&gt; <a class='struct' href='../regex_syntax/struct.CharClass.html' title='regex_syntax::CharClass'>CharClass</a></code></h4>
<div class='docblock'><p>Apply case folding to this character class.</p>
<p>N.B. Applying case folding to a negated character class probably
won&#39;t produce the expected result. e.g., <code>(?i)[^x]</code> really should
match any character sans <code>x</code> and <code>X</code>, but if <code>[^x]</code> is negated
before being case folded, you&#39;ll end up matching any character.</p>
</div></div><h2 id='deref-methods'>Methods from <a class='trait' href='https://doc.rust-lang.org/nightly/core/ops/trait.Deref.html' title='core::ops::Deref'>Deref</a>&lt;Target=<a class='struct' href='https://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html' title='collections::vec::Vec'>Vec</a>&lt;<a class='struct' href='../regex_syntax/struct.ClassRange.html' title='regex_syntax::ClassRange'>ClassRange</a>&gt;&gt;</h2><div class='impl-items'><h4 id='method.capacity' class='method'><span class="since">1.0.0</span><code>fn <a href='#method.capacity' class='fnname'>capacity</a>(&amp;self) -&gt; <a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.usize.html'>usize</a></code></h4>
<div class='docblock'><p>Returns the number of elements the vector can hold without
reallocating.</p>
<h1 id='examples' class='section-header'><a href='#examples'>Examples</a></h1>
<pre class='rust rust-example-rendered'>
<span class='kw'>let</span> <span class='ident'>vec</span>: <span class='ident'>Vec</span><span class='op'>&lt;</span><span class='ident'>i32</span><span class='op'>&gt;</span> <span class='op'>=</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'>vec</span>.<span class='ident'>capacity</span>(), <span class='number'>10</span>);</pre>
</div><h4 id='method.reserve' class='method'><span class="since">1.0.0</span><code>fn <a href='#method.reserve' class='fnname'>reserve</a>(&amp;mut self, additional: <a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.usize.html'>usize</a>)</code></h4>
<div class='docblock'><p>Reserves capacity for at least <code>additional</code> more elements to be inserted
in the given <code>Vec&lt;T&gt;</code>. The collection may reserve more space to avoid
frequent reallocations.</p>
<h1 id='panics' class='section-header'><a href='#panics'>Panics</a></h1>
<p>Panics if the new capacity overflows <code>usize</code>.</p>
<h1 id='examples-1' class='section-header'><a href='#examples-1'>Examples</a></h1>
<pre class='rust rust-example-rendered'>
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>vec</span> <span class='op'>=</span> <span class='macro'>vec</span><span class='macro'>!</span>[<span class='number'>1</span>];
<span class='ident'>vec</span>.<span class='ident'>reserve</span>(<span class='number'>10</span>);
<span class='macro'>assert</span><span class='macro'>!</span>(<span class='ident'>vec</span>.<span class='ident'>capacity</span>() <span class='op'>&gt;=</span> <span class='number'>11</span>);</pre>
</div><h4 id='method.reserve_exact' class='method'><span class="since">1.0.0</span><code>fn <a href='#method.reserve_exact' class='fnname'>reserve_exact</a>(&amp;mut self, additional: <a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.usize.html'>usize</a>)</code></h4>
<div class='docblock'><p>Reserves the minimum capacity for exactly <code>additional</code> more elements to
be inserted in the given <code>Vec&lt;T&gt;</code>. Does nothing if the capacity is already
sufficient.</p>
<p>Note that the allocator may give the collection more space than it
requests. Therefore capacity can not be relied upon to be precisely
minimal. Prefer <code>reserve</code> if future insertions are expected.</p>
<h1 id='panics-1' class='section-header'><a href='#panics-1'>Panics</a></h1>
<p>Panics if the new capacity overflows <code>usize</code>.</p>
<h1 id='examples-2' class='section-header'><a href='#examples-2'>Examples</a></h1>
<pre class='rust rust-example-rendered'>
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>vec</span> <span class='op'>=</span> <span class='macro'>vec</span><span class='macro'>!</span>[<span class='number'>1</span>];
<span class='ident'>vec</span>.<span class='ident'>reserve_exact</span>(<span class='number'>10</span>);
<span class='macro'>assert</span><span class='macro'>!</span>(<span class='ident'>vec</span>.<span class='ident'>capacity</span>() <span class='op'>&gt;=</span> <span class='number'>11</span>);</pre>
</div><h4 id='method.shrink_to_fit' class='method'><span class="since">1.0.0</span><code>fn <a href='#method.shrink_to_fit' class='fnname'>shrink_to_fit</a>(&amp;mut self)</code></h4>
<div class='docblock'><p>Shrinks the capacity of the vector as much as possible.</p>
<p>It will drop down as close as possible to the length but the allocator
may still inform the vector that there is space for a few more elements.</p>
<h1 id='examples-3' class='section-header'><a href='#examples-3'>Examples</a></h1>
<pre class='rust rust-example-rendered'>
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>vec</span> <span class='op'>=</span> <span class='ident'>Vec</span>::<span class='ident'>with_capacity</span>(<span class='number'>10</span>);
<span class='ident'>vec</span>.<span class='ident'>extend</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='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>vec</span>.<span class='ident'>capacity</span>(), <span class='number'>10</span>);
<span class='ident'>vec</span>.<span class='ident'>shrink_to_fit</span>();
<span class='macro'>assert</span><span class='macro'>!</span>(<span class='ident'>vec</span>.<span class='ident'>capacity</span>() <span class='op'>&gt;=</span> <span class='number'>3</span>);</pre>
</div><h4 id='method.into_boxed_slice' class='method'><span class="since">1.0.0</span><code>fn <a href='#method.into_boxed_slice' class='fnname'>into_boxed_slice</a>(self) -&gt; <a class='struct' href='https://doc.rust-lang.org/nightly/alloc/boxed/struct.Box.html' title='alloc::boxed::Box'>Box</a>&lt;<a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.slice.html'>[</a>T<a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.slice.html'>]</a>&gt;</code></h4>
<div class='docblock'><p>Converts the vector into Box&lt;[T]&gt;.</p>
<p>Note that this will drop any excess capacity. Calling this and
converting back to a vector with <code>into_vec()</code> is equivalent to calling
<code>shrink_to_fit()</code>.</p>
</div><h4 id='method.truncate' class='method'><span class="since">1.0.0</span><code>fn <a href='#method.truncate' class='fnname'>truncate</a>(&amp;mut self, len: <a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.usize.html'>usize</a>)</code></h4>
<div class='docblock'><p>Shorten a vector to be <code>len</code> elements long, dropping excess elements.</p>
<p>If <code>len</code> is greater than the vector&#39;s current length, this has no
effect.</p>
<h1 id='examples-4' class='section-header'><a href='#examples-4'>Examples</a></h1>
<pre class='rust rust-example-rendered'>
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>vec</span> <span class='op'>=</span> <span class='macro'>vec</span><span class='macro'>!</span>[<span class='number'>1</span>, <span class='number'>2</span>, <span class='number'>3</span>, <span class='number'>4</span>, <span class='number'>5</span>];
<span class='ident'>vec</span>.<span class='ident'>truncate</span>(<span class='number'>2</span>);
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>vec</span>, [<span class='number'>1</span>, <span class='number'>2</span>]);</pre>
</div><h4 id='method.as_slice' class='method'><span class="since">1.7.0</span><code>fn <a href='#method.as_slice' class='fnname'>as_slice</a>(&amp;self) -&gt; <a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.slice.html'>&amp;[T]</a></code></h4>
<div class='docblock'><p>Extracts a slice containing the entire vector.</p>
<p>Equivalent to <code>&amp;s[..]</code>.</p>
</div><h4 id='method.as_mut_slice' class='method'><span class="since">1.7.0</span><code>fn <a href='#method.as_mut_slice' class='fnname'>as_mut_slice</a>(&amp;mut self) -&gt; <a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.slice.html'>&amp;mut [T]</a></code></h4>
<div class='docblock'><p>Extracts a mutable slice of the entire vector.</p>
<p>Equivalent to <code>&amp;mut s[..]</code>.</p>
</div><h4 id='method.set_len' class='method'><span class="since">1.0.0</span><code>unsafe fn <a href='#method.set_len' class='fnname'>set_len</a>(&amp;mut self, len: <a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.usize.html'>usize</a>)</code></h4>
<div class='docblock'><p>Sets the length of a vector.</p>
<p>This will explicitly set the size of the vector, without actually
modifying its buffers, so it is up to the caller to ensure that the
vector is actually the specified size.</p>
<h1 id='examples-5' class='section-header'><a href='#examples-5'>Examples</a></h1>
<pre class='rust rust-example-rendered'>
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>v</span> <span class='op'>=</span> <span class='macro'>vec</span><span class='macro'>!</span>[<span class='number'>1</span>, <span class='number'>2</span>, <span class='number'>3</span>, <span class='number'>4</span>];
<span class='kw'>unsafe</span> {
<span class='ident'>v</span>.<span class='ident'>set_len</span>(<span class='number'>1</span>);
}</pre>
</div><h4 id='method.swap_remove' class='method'><span class="since">1.0.0</span><code>fn <a href='#method.swap_remove' class='fnname'>swap_remove</a>(&amp;mut self, index: <a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.usize.html'>usize</a>) -&gt; T</code></h4>
<div class='docblock'><p>Removes an element from anywhere in the vector and return it, replacing
it with the last element.</p>
<p>This does not preserve ordering, but is O(1).</p>
<h1 id='panics-2' class='section-header'><a href='#panics-2'>Panics</a></h1>
<p>Panics if <code>index</code> is out of bounds.</p>
<h1 id='examples-6' class='section-header'><a href='#examples-6'>Examples</a></h1>
<pre class='rust rust-example-rendered'>
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>v</span> <span class='op'>=</span> <span class='macro'>vec</span><span class='macro'>!</span>[<span class='string'>&quot;foo&quot;</span>, <span class='string'>&quot;bar&quot;</span>, <span class='string'>&quot;baz&quot;</span>, <span class='string'>&quot;qux&quot;</span>];
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>v</span>.<span class='ident'>swap_remove</span>(<span class='number'>1</span>), <span class='string'>&quot;bar&quot;</span>);
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>v</span>, [<span class='string'>&quot;foo&quot;</span>, <span class='string'>&quot;qux&quot;</span>, <span class='string'>&quot;baz&quot;</span>]);
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>v</span>.<span class='ident'>swap_remove</span>(<span class='number'>0</span>), <span class='string'>&quot;foo&quot;</span>);
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>v</span>, [<span class='string'>&quot;baz&quot;</span>, <span class='string'>&quot;qux&quot;</span>]);</pre>
</div><h4 id='method.insert' class='method'><span class="since">1.0.0</span><code>fn <a href='#method.insert' class='fnname'>insert</a>(&amp;mut self, index: <a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.usize.html'>usize</a>, element: T)</code></h4>
<div class='docblock'><p>Inserts an element at position <code>index</code> within the vector, shifting all
elements after it to the right.</p>
<h1 id='panics-3' class='section-header'><a href='#panics-3'>Panics</a></h1>
<p>Panics if <code>index</code> is greater than the vector&#39;s length.</p>
<h1 id='examples-7' class='section-header'><a href='#examples-7'>Examples</a></h1>
<pre class='rust rust-example-rendered'>
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>vec</span> <span class='op'>=</span> <span class='macro'>vec</span><span class='macro'>!</span>[<span class='number'>1</span>, <span class='number'>2</span>, <span class='number'>3</span>];
<span class='ident'>vec</span>.<span class='ident'>insert</span>(<span class='number'>1</span>, <span class='number'>4</span>);
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>vec</span>, [<span class='number'>1</span>, <span class='number'>4</span>, <span class='number'>2</span>, <span class='number'>3</span>]);
<span class='ident'>vec</span>.<span class='ident'>insert</span>(<span class='number'>4</span>, <span class='number'>5</span>);
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>vec</span>, [<span class='number'>1</span>, <span class='number'>4</span>, <span class='number'>2</span>, <span class='number'>3</span>, <span class='number'>5</span>]);</pre>
</div><h4 id='method.remove-1' class='method'><span class="since">1.0.0</span><code>fn <a href='#method.remove' class='fnname'>remove</a>(&amp;mut self, index: <a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.usize.html'>usize</a>) -&gt; T</code></h4>
<div class='docblock'><p>Removes and returns the element at position <code>index</code> within the vector,
shifting all elements after it to the left.</p>
<h1 id='panics-4' class='section-header'><a href='#panics-4'>Panics</a></h1>
<p>Panics if <code>index</code> is out of bounds.</p>
<h1 id='examples-8' class='section-header'><a href='#examples-8'>Examples</a></h1>
<pre class='rust rust-example-rendered'>
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>v</span> <span class='op'>=</span> <span class='macro'>vec</span><span class='macro'>!</span>[<span class='number'>1</span>, <span class='number'>2</span>, <span class='number'>3</span>];
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>v</span>.<span class='ident'>remove</span>(<span class='number'>1</span>), <span class='number'>2</span>);
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>v</span>, [<span class='number'>1</span>, <span class='number'>3</span>]);</pre>
</div><h4 id='method.retain' class='method'><span class="since">1.0.0</span><code>fn <a href='#method.retain' class='fnname'>retain</a>&lt;F&gt;(&amp;mut self, f: F) <span class='where'>where F: <a class='trait' href='https://doc.rust-lang.org/nightly/core/ops/trait.FnMut.html' title='core::ops::FnMut'>FnMut</a>(&amp;T) -&gt; <a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.bool.html'>bool</a></span></code></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(&amp;e)</code> returns false.
This method operates in place and preserves the order of the retained
elements.</p>
<h1 id='examples-9' class='section-header'><a href='#examples-9'>Examples</a></h1>
<pre class='rust rust-example-rendered'>
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>vec</span> <span class='op'>=</span> <span class='macro'>vec</span><span class='macro'>!</span>[<span class='number'>1</span>, <span class='number'>2</span>, <span class='number'>3</span>, <span class='number'>4</span>];
<span class='ident'>vec</span>.<span class='ident'>retain</span>(<span class='op'>|</span><span class='kw-2'>&amp;</span><span class='ident'>x</span><span class='op'>|</span> <span class='ident'>x</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'>vec</span>, [<span class='number'>2</span>, <span class='number'>4</span>]);</pre>
</div><h4 id='method.push' class='method'><span class="since">1.0.0</span><code>fn <a href='#method.push' class='fnname'>push</a>(&amp;mut self, value: T)</code></h4>
<div class='docblock'><p>Appends an element to the back of a collection.</p>
<h1 id='panics-5' class='section-header'><a href='#panics-5'>Panics</a></h1>
<p>Panics if the number of elements in the vector overflows a <code>usize</code>.</p>
<h1 id='examples-10' class='section-header'><a href='#examples-10'>Examples</a></h1>
<pre class='rust rust-example-rendered'>
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>vec</span> <span class='op'>=</span> <span class='macro'>vec</span><span class='macro'>!</span>[<span class='number'>1</span>, <span class='number'>2</span>];
<span class='ident'>vec</span>.<span class='ident'>push</span>(<span class='number'>3</span>);
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>vec</span>, [<span class='number'>1</span>, <span class='number'>2</span>, <span class='number'>3</span>]);</pre>
</div><h4 id='method.pop' class='method'><span class="since">1.0.0</span><code>fn <a href='#method.pop' class='fnname'>pop</a>(&amp;mut self) -&gt; <a class='enum' href='https://doc.rust-lang.org/nightly/core/option/enum.Option.html' title='core::option::Option'>Option</a>&lt;T&gt;</code></h4>
<div class='docblock'><p>Removes the last element from a vector and returns it, or <code>None</code> if it
is empty.</p>
<h1 id='examples-11' class='section-header'><a href='#examples-11'>Examples</a></h1>
<pre class='rust rust-example-rendered'>
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>vec</span> <span class='op'>=</span> <span class='macro'>vec</span><span class='macro'>!</span>[<span class='number'>1</span>, <span class='number'>2</span>, <span class='number'>3</span>];
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>vec</span>.<span class='ident'>pop</span>(), <span class='prelude-val'>Some</span>(<span class='number'>3</span>));
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>vec</span>, [<span class='number'>1</span>, <span class='number'>2</span>]);</pre>
</div><h4 id='method.append' class='method'><span class="since">1.4.0</span><code>fn <a href='#method.append' class='fnname'>append</a>(&amp;mut self, other: &amp;mut <a class='struct' href='https://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html' title='collections::vec::Vec'>Vec</a>&lt;T&gt;)</code></h4>
<div class='docblock'><p>Moves all the elements of <code>other</code> into <code>Self</code>, leaving <code>other</code> empty.</p>
<h1 id='panics-6' class='section-header'><a href='#panics-6'>Panics</a></h1>
<p>Panics if the number of elements in the vector overflows a <code>usize</code>.</p>
<h1 id='examples-12' class='section-header'><a href='#examples-12'>Examples</a></h1>
<pre class='rust rust-example-rendered'>
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>vec</span> <span class='op'>=</span> <span class='macro'>vec</span><span class='macro'>!</span>[<span class='number'>1</span>, <span class='number'>2</span>, <span class='number'>3</span>];
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>vec2</span> <span class='op'>=</span> <span class='macro'>vec</span><span class='macro'>!</span>[<span class='number'>4</span>, <span class='number'>5</span>, <span class='number'>6</span>];
<span class='ident'>vec</span>.<span class='ident'>append</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>vec2</span>);
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>vec</span>, [<span class='number'>1</span>, <span class='number'>2</span>, <span class='number'>3</span>, <span class='number'>4</span>, <span class='number'>5</span>, <span class='number'>6</span>]);
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>vec2</span>, []);</pre>
</div><h4 id='method.drain' class='method'><span class="since">1.6.0</span><code>fn <a href='#method.drain' class='fnname'>drain</a>&lt;R&gt;(&amp;mut self, range: R) -&gt; <a class='struct' href='https://doc.rust-lang.org/nightly/collections/vec/struct.Drain.html' title='collections::vec::Drain'>Drain</a>&lt;T&gt; <span class='where'>where R: <a class='trait' href='https://doc.rust-lang.org/nightly/collections/range/trait.RangeArgument.html' title='collections::range::RangeArgument'>RangeArgument</a>&lt;<a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.usize.html'>usize</a>&gt;</span></code></h4>
<div class='docblock'><p>Create a draining iterator that removes the specified range in the vector
and yields the removed items.</p>
<p>Note 1: The element range is removed even if the iterator is not
consumed until the end.</p>
<p>Note 2: It is unspecified how many elements are removed from the vector,
if the <code>Drain</code> value is leaked.</p>
<h1 id='panics-7' class='section-header'><a href='#panics-7'>Panics</a></h1>
<p>Panics if the starting point is greater than the end point or if
the end point is greater than the length of the vector.</p>
<h1 id='examples-13' class='section-header'><a href='#examples-13'>Examples</a></h1>
<pre class='rust rust-example-rendered'>
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>v</span> <span class='op'>=</span> <span class='macro'>vec</span><span class='macro'>!</span>[<span class='number'>1</span>, <span class='number'>2</span>, <span class='number'>3</span>];
<span class='kw'>let</span> <span class='ident'>u</span>: <span class='ident'>Vec</span><span class='op'>&lt;</span>_<span class='op'>&gt;</span> <span class='op'>=</span> <span class='ident'>v</span>.<span class='ident'>drain</span>(<span class='number'>1</span>..).<span class='ident'>collect</span>();
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>v</span>, <span class='kw-2'>&amp;</span>[<span class='number'>1</span>]);
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>u</span>, <span class='kw-2'>&amp;</span>[<span class='number'>2</span>, <span class='number'>3</span>]);
<span class='comment'>// A full range clears the vector</span>
<span class='ident'>v</span>.<span class='ident'>drain</span>(..);
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>v</span>, <span class='kw-2'>&amp;</span>[]);</pre>
</div><h4 id='method.clear' class='method'><span class="since">1.0.0</span><code>fn <a href='#method.clear' class='fnname'>clear</a>(&amp;mut self)</code></h4>
<div class='docblock'><p>Clears the vector, removing all values.</p>
<h1 id='examples-14' class='section-header'><a href='#examples-14'>Examples</a></h1>
<pre class='rust rust-example-rendered'>
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>v</span> <span class='op'>=</span> <span class='macro'>vec</span><span class='macro'>!</span>[<span class='number'>1</span>, <span class='number'>2</span>, <span class='number'>3</span>];
<span class='ident'>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.len' class='method'><span class="since">1.0.0</span><code>fn <a href='#method.len' class='fnname'>len</a>(&amp;self) -&gt; <a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.usize.html'>usize</a></code></h4>
<div class='docblock'><p>Returns the number of elements in the vector.</p>
<h1 id='examples-15' class='section-header'><a href='#examples-15'>Examples</a></h1>
<pre class='rust rust-example-rendered'>
<span class='kw'>let</span> <span class='ident'>a</span> <span class='op'>=</span> <span class='macro'>vec</span><span class='macro'>!</span>[<span class='number'>1</span>, <span class='number'>2</span>, <span class='number'>3</span>];
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>a</span>.<span class='ident'>len</span>(), <span class='number'>3</span>);</pre>
</div><h4 id='method.is_empty' class='method'><span class="since">1.0.0</span><code>fn <a href='#method.is_empty' class='fnname'>is_empty</a>(&amp;self) -&gt; <a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.bool.html'>bool</a></code></h4>
<div class='docblock'><p>Returns <code>true</code> if the vector contains no elements.</p>
<h1 id='examples-16' class='section-header'><a href='#examples-16'>Examples</a></h1>
<pre class='rust rust-example-rendered'>
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>v</span> <span class='op'>=</span> <span class='ident'>Vec</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'>push</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.split_off' class='method'><span class="since">1.4.0</span><code>fn <a href='#method.split_off' class='fnname'>split_off</a>(&amp;mut self, at: <a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.usize.html'>usize</a>) -&gt; <a class='struct' href='https://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html' title='collections::vec::Vec'>Vec</a>&lt;T&gt;</code></h4>
<div class='docblock'><p>Splits the collection into two at the given index.</p>
<p>Returns a newly allocated <code>Self</code>. <code>self</code> contains elements <code>[0, at)</code>,
and the returned <code>Self</code> contains elements <code>[at, len)</code>.</p>
<p>Note that the capacity of <code>self</code> does not change.</p>
<h1 id='panics-8' class='section-header'><a href='#panics-8'>Panics</a></h1>
<p>Panics if <code>at &gt; len</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'>let</span> <span class='kw-2'>mut</span> <span class='ident'>vec</span> <span class='op'>=</span> <span class='macro'>vec</span><span class='macro'>!</span>[<span class='number'>1</span>,<span class='number'>2</span>,<span class='number'>3</span>];
<span class='kw'>let</span> <span class='ident'>vec2</span> <span class='op'>=</span> <span class='ident'>vec</span>.<span class='ident'>split_off</span>(<span class='number'>1</span>);
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>vec</span>, [<span class='number'>1</span>]);
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>vec2</span>, [<span class='number'>2</span>, <span class='number'>3</span>]);</pre>
</div></div><div class='impl-items'><h4 id='method.resize' class='method'><span class="since">1.5.0</span><code>fn <a href='#method.resize' class='fnname'>resize</a>(&amp;mut self, new_len: <a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.usize.html'>usize</a>, value: T)</code></h4>
<div class='docblock'><p>Resizes the <code>Vec</code> in-place so that <code>len()</code> is equal to <code>new_len</code>.</p>
<p>If <code>new_len</code> is greater than <code>len()</code>, the <code>Vec</code> is extended by the
difference, with each additional slot filled with <code>value</code>.
If <code>new_len</code> is less than <code>len()</code>, the <code>Vec</code> is simply truncated.</p>
<h1 id='examples-18' class='section-header'><a href='#examples-18'>Examples</a></h1>
<pre class='rust rust-example-rendered'>
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>vec</span> <span class='op'>=</span> <span class='macro'>vec</span><span class='macro'>!</span>[<span class='string'>&quot;hello&quot;</span>];
<span class='ident'>vec</span>.<span class='ident'>resize</span>(<span class='number'>3</span>, <span class='string'>&quot;world&quot;</span>);
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>vec</span>, [<span class='string'>&quot;hello&quot;</span>, <span class='string'>&quot;world&quot;</span>, <span class='string'>&quot;world&quot;</span>]);
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>vec</span> <span class='op'>=</span> <span class='macro'>vec</span><span class='macro'>!</span>[<span class='number'>1</span>, <span class='number'>2</span>, <span class='number'>3</span>, <span class='number'>4</span>];
<span class='ident'>vec</span>.<span class='ident'>resize</span>(<span class='number'>2</span>, <span class='number'>0</span>);
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>vec</span>, [<span class='number'>1</span>, <span class='number'>2</span>]);</pre>
</div><h4 id='method.extend_from_slice' class='method'><span class="since">1.6.0</span><code>fn <a href='#method.extend_from_slice' class='fnname'>extend_from_slice</a>(&amp;mut self, other: <a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.slice.html'>&amp;[T]</a>)</code></h4>
<div class='docblock'><p>Appends all elements in a slice to the <code>Vec</code>.</p>
<p>Iterates over the slice <code>other</code>, clones each element, and then appends
it to this <code>Vec</code>. The <code>other</code> vector is traversed in-order.</p>
<p>Note that this function is same as <code>extend</code> except that it is
specialized to work with slices instead. If and when Rust gets
specialization this function will likely be deprecated (but still
available).</p>
<h1 id='examples-19' class='section-header'><a href='#examples-19'>Examples</a></h1>
<pre class='rust rust-example-rendered'>
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>vec</span> <span class='op'>=</span> <span class='macro'>vec</span><span class='macro'>!</span>[<span class='number'>1</span>];
<span class='ident'>vec</span>.<span class='ident'>extend_from_slice</span>(<span class='kw-2'>&amp;</span>[<span class='number'>2</span>, <span class='number'>3</span>, <span class='number'>4</span>]);
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>vec</span>, [<span class='number'>1</span>, <span class='number'>2</span>, <span class='number'>3</span>, <span class='number'>4</span>]);</pre>
</div></div><div class='impl-items'><h4 id='method.dedup' class='method'><span class="since">1.0.0</span><code>fn <a href='#method.dedup' class='fnname'>dedup</a>(&amp;mut self)</code></h4>
<div class='docblock'><p>Removes consecutive repeated elements in the vector.</p>
<p>If the vector is sorted, this removes all duplicates.</p>
<h1 id='examples-20' class='section-header'><a href='#examples-20'>Examples</a></h1>
<pre class='rust rust-example-rendered'>
<span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>vec</span> <span class='op'>=</span> <span class='macro'>vec</span><span class='macro'>!</span>[<span class='number'>1</span>, <span class='number'>2</span>, <span class='number'>2</span>, <span class='number'>3</span>, <span class='number'>2</span>];
<span class='ident'>vec</span>.<span class='ident'>dedup</span>();
<span class='macro'>assert_eq</span><span class='macro'>!</span>(<span class='ident'>vec</span>, [<span class='number'>1</span>, <span class='number'>2</span>, <span class='number'>3</span>, <span class='number'>2</span>]);</pre>
</div></div><h2 id='implementations'>Trait Implementations</h2><h3 class='impl'><code>impl <a class='trait' href='https://doc.rust-lang.org/nightly/core/ops/trait.Deref.html' title='core::ops::Deref'>Deref</a> for <a class='struct' href='../regex_syntax/struct.CharClass.html' title='regex_syntax::CharClass'>CharClass</a></code></h3><div class='impl-items'><h4 id='associatedtype.Target' class='type'><code>type <a href='https://doc.rust-lang.org/nightly/core/ops/trait.Deref.html#associatedtype.Target' class='type'>Target</a> = <a class='struct' href='https://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html' title='collections::vec::Vec'>Vec</a>&lt;<a class='struct' href='../regex_syntax/struct.ClassRange.html' title='regex_syntax::ClassRange'>ClassRange</a>&gt;</code></h4>
<h4 id='method.deref' class='method'><code>fn <a href='https://doc.rust-lang.org/nightly/core/ops/trait.Deref.html#tymethod.deref' class='fnname'>deref</a>(&amp;self) -&gt; &amp;<a class='struct' href='https://doc.rust-lang.org/nightly/collections/vec/struct.Vec.html' title='collections::vec::Vec'>Vec</a>&lt;<a class='struct' href='../regex_syntax/struct.ClassRange.html' title='regex_syntax::ClassRange'>ClassRange</a>&gt;</code></h4>
</div><h3 class='impl'><code>impl <a class='trait' href='https://doc.rust-lang.org/nightly/core/iter/trait.IntoIterator.html' title='core::iter::IntoIterator'>IntoIterator</a> for <a class='struct' href='../regex_syntax/struct.CharClass.html' title='regex_syntax::CharClass'>CharClass</a></code></h3><div class='impl-items'><h4 id='associatedtype.Item' class='type'><code>type <a href='https://doc.rust-lang.org/nightly/core/iter/trait.IntoIterator.html#associatedtype.Item' class='type'>Item</a> = <a class='struct' href='../regex_syntax/struct.ClassRange.html' title='regex_syntax::ClassRange'>ClassRange</a></code></h4>
<h4 id='associatedtype.IntoIter' class='type'><code>type <a href='https://doc.rust-lang.org/nightly/core/iter/trait.IntoIterator.html#associatedtype.IntoIter' class='type'>IntoIter</a> = <a class='struct' href='https://doc.rust-lang.org/nightly/collections/vec/struct.IntoIter.html' title='collections::vec::IntoIter'>IntoIter</a>&lt;<a class='struct' href='../regex_syntax/struct.ClassRange.html' title='regex_syntax::ClassRange'>ClassRange</a>&gt;</code></h4>
<h4 id='method.into_iter' class='method'><code>fn <a href='https://doc.rust-lang.org/nightly/core/iter/trait.IntoIterator.html#tymethod.into_iter' class='fnname'>into_iter</a>(self) -&gt; <a class='struct' href='https://doc.rust-lang.org/nightly/collections/vec/struct.IntoIter.html' title='collections::vec::IntoIter'>IntoIter</a>&lt;<a class='struct' href='../regex_syntax/struct.ClassRange.html' title='regex_syntax::ClassRange'>ClassRange</a>&gt;</code></h4>
</div><h3 class='impl'><code>impl&lt;'a&gt; <a class='trait' href='https://doc.rust-lang.org/nightly/core/iter/trait.IntoIterator.html' title='core::iter::IntoIterator'>IntoIterator</a> for &amp;'a <a class='struct' href='../regex_syntax/struct.CharClass.html' title='regex_syntax::CharClass'>CharClass</a></code></h3><div class='impl-items'><h4 id='associatedtype.Item-1' class='type'><code>type <a href='https://doc.rust-lang.org/nightly/core/iter/trait.IntoIterator.html#associatedtype.Item' class='type'>Item</a> = &amp;'a <a class='struct' href='../regex_syntax/struct.ClassRange.html' title='regex_syntax::ClassRange'>ClassRange</a></code></h4>
<h4 id='associatedtype.IntoIter-1' class='type'><code>type <a href='https://doc.rust-lang.org/nightly/core/iter/trait.IntoIterator.html#associatedtype.IntoIter' class='type'>IntoIter</a> = <a class='struct' href='https://doc.rust-lang.org/nightly/core/slice/struct.Iter.html' title='core::slice::Iter'>Iter</a>&lt;'a, <a class='struct' href='../regex_syntax/struct.ClassRange.html' title='regex_syntax::ClassRange'>ClassRange</a>&gt;</code></h4>
<h4 id='method.into_iter-1' class='method'><code>fn <a href='https://doc.rust-lang.org/nightly/core/iter/trait.IntoIterator.html#tymethod.into_iter' class='fnname'>into_iter</a>(self) -&gt; <a class='struct' href='https://doc.rust-lang.org/nightly/core/slice/struct.Iter.html' title='core::slice::Iter'>Iter</a>&lt;'a, <a class='struct' href='../regex_syntax/struct.ClassRange.html' title='regex_syntax::ClassRange'>ClassRange</a>&gt;</code></h4>
</div><h3 class='impl'><code>impl <a class='trait' href='https://doc.rust-lang.org/nightly/core/fmt/trait.Display.html' title='core::fmt::Display'>Display</a> for <a class='struct' href='../regex_syntax/struct.CharClass.html' title='regex_syntax::CharClass'>CharClass</a></code></h3><div class='impl-items'><h4 id='method.fmt' class='method'><code>fn <a href='https://doc.rust-lang.org/nightly/core/fmt/trait.Display.html#tymethod.fmt' class='fnname'>fmt</a>(&amp;self, f: &amp;mut <a class='struct' href='https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html' title='core::fmt::Formatter'>Formatter</a>) -&gt; <a class='type' href='https://doc.rust-lang.org/nightly/core/fmt/type.Result.html' title='core::fmt::Result'>Result</a></code></h4>
</div><h3 id='derived_implementations'>Derived Implementations </h3><h3 class='impl'><code>impl <a class='trait' href='https://doc.rust-lang.org/nightly/core/cmp/trait.Eq.html' title='core::cmp::Eq'>Eq</a> for <a class='struct' href='../regex_syntax/struct.CharClass.html' title='regex_syntax::CharClass'>CharClass</a></code></h3><div class='impl-items'></div><h3 class='impl'><code>impl <a class='trait' href='https://doc.rust-lang.org/nightly/core/cmp/trait.PartialEq.html' title='core::cmp::PartialEq'>PartialEq</a> for <a class='struct' href='../regex_syntax/struct.CharClass.html' title='regex_syntax::CharClass'>CharClass</a></code></h3><div class='impl-items'><h4 id='method.eq' class='method'><code>fn <a href='https://doc.rust-lang.org/nightly/core/cmp/trait.PartialEq.html#tymethod.eq' class='fnname'>eq</a>(&amp;self, __arg_0: &amp;<a class='struct' href='../regex_syntax/struct.CharClass.html' title='regex_syntax::CharClass'>CharClass</a>) -&gt; <a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.bool.html'>bool</a></code></h4>
<h4 id='method.ne' class='method'><code>fn <a href='https://doc.rust-lang.org/nightly/core/cmp/trait.PartialEq.html#method.ne' class='fnname'>ne</a>(&amp;self, __arg_0: &amp;<a class='struct' href='../regex_syntax/struct.CharClass.html' title='regex_syntax::CharClass'>CharClass</a>) -&gt; <a class='primitive' href='https://doc.rust-lang.org/nightly/std/primitive.bool.html'>bool</a></code></h4>
</div><h3 class='impl'><code>impl <a class='trait' href='https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html' title='core::fmt::Debug'>Debug</a> for <a class='struct' href='../regex_syntax/struct.CharClass.html' title='regex_syntax::CharClass'>CharClass</a></code></h3><div class='impl-items'><h4 id='method.fmt-1' class='method'><code>fn <a href='https://doc.rust-lang.org/nightly/core/fmt/trait.Debug.html#tymethod.fmt' class='fnname'>fmt</a>(&amp;self, __arg_0: &amp;mut <a class='struct' href='https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html' title='core::fmt::Formatter'>Formatter</a>) -&gt; <a class='type' href='https://doc.rust-lang.org/nightly/core/fmt/type.Result.html' title='core::fmt::Result'>Result</a></code></h4>
</div><h3 class='impl'><code>impl <a class='trait' href='https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html' title='core::clone::Clone'>Clone</a> for <a class='struct' href='../regex_syntax/struct.CharClass.html' title='regex_syntax::CharClass'>CharClass</a></code></h3><div class='impl-items'><h4 id='method.clone' class='method'><code>fn <a href='https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html#tymethod.clone' class='fnname'>clone</a>(&amp;self) -&gt; <a class='struct' href='../regex_syntax/struct.CharClass.html' title='regex_syntax::CharClass'>CharClass</a></code></h4>
<h4 id='method.clone_from' class='method'><span class="since">1.0.0</span><code>fn <a href='https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html#method.clone_from' class='fnname'>clone_from</a>(&amp;mut self, source: &amp;Self)</code></h4>
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