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2018-08-22 17:04:13 +00:00
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<p class='location'>Struct From</p><div class="sidebar-elems"><div class="block items"><a class="sidebar-title" href="#deref-methods">Methods from Deref&lt;Target=String&gt;</a><div class="sidebar-links"><a href="#method.as_str">as_str</a><a href="#method.capacity">capacity</a><a href="#method.as_bytes">as_bytes</a><a href="#method.len">len</a><a href="#method.is_empty">is_empty</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-PartialEq">PartialEq</a><a href="#impl-Deref">Deref</a><a href="#impl-DerefMut">DerefMut</a><a href="#impl-Header">Header</a><a href="#impl-Display">Display</a></div></div><p class='location'><a href='../index.html'>hyper</a>::<wbr><a href='index.html'>header</a></p><script>window.sidebarCurrent = {name: 'From', 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'>hyper</a>::<wbr><a href='index.html'>header</a>::<wbr><a class="struct" href=''>From</a></span><span class='out-of-band'><span id='render-detail'>
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[<span class='inner'>&#x2212;</span>]
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</span><a class='srclink' href='../../src/hyper/header/common/mod.rs.html#258' title='goto source code'>[src]</a></span></h1>
<pre class='rust struct'>pub struct From(pub <a class="struct" href="https://doc.rust-lang.org/nightly/alloc/string/struct.String.html" title="struct alloc::string::String">String</a>);</pre><div class='docblock'><p><code>From</code> header, defined in <a href="http://tools.ietf.org/html/rfc7231#section-5.5.1">RFC7231</a></p>
<p>The <code>From</code> header field contains an Internet email address for a
human user who controls the requesting user agent. The address ought
to be machine-usable.</p>
<h1 id="abnf" class="section-header"><a href="#abnf">ABNF</a></h1>
<pre><code class="language-text">From = mailbox
mailbox = &lt;mailbox, see [RFC5322], Section 3.4&gt;
</code></pre>
<h1 id="example" class="section-header"><a href="#example">Example</a></h1>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">hyper</span>::<span class="ident">header</span>::{<span class="ident">Headers</span>, <span class="ident">From</span>};
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">headers</span> <span class="op">=</span> <span class="ident">Headers</span>::<span class="ident">new</span>();
<span class="ident">headers</span>.<span class="ident">set</span>(<span class="ident">From</span>(<span class="string">&quot;webmaster@example.org&quot;</span>.<span class="ident">to_owned</span>()));</pre>
</div>
<h2 id='deref-methods' class='small-section-header'>
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>&lt;Target = <a class="struct" href="https://doc.rust-lang.org/nightly/alloc/string/struct.String.html" title="struct alloc::string::String">String</a>&gt;<a href='#deref-methods' class='anchor'></a>
</h2>
<div class='impl-items'><h4 id='method.as_str' class="method"><span id='as_str.v' class='invisible'><code>pub fn <a href='#method.as_str' class='fnname'>as_str</a>(&amp;self) -&gt; &amp;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a></code></span><span class='out-of-band'><div class='ghost'></div><div class='since' title='Stable since Rust version 1.7.0'>1.7.0</div><a class='srclink' href='https://doc.rust-lang.org/nightly/src/alloc/string.rs.html#765-767' title='goto source code'>[src]</a></span></h4>
<div class='docblock'><p>Extracts a string slice containing the entire string.</p>
<h1 id="examples" class="section-header"><a href="#examples">Examples</a></h1>
<p>Basic usage:</p>
<pre class="rust rust-example-rendered">
<span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="ident">String</span>::<span class="ident">from</span>(<span class="string">&quot;foo&quot;</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">&quot;foo&quot;</span>, <span class="ident">s</span>.<span class="ident">as_str</span>());</pre>
</div><h4 id='method.as_mut_str' class="method"><span id='as_mut_str.v' class='invisible'><code>pub fn <a href='#method.as_mut_str' class='fnname'>as_mut_str</a>(&amp;mut self) -&gt; &amp;mut <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a></code></span><span class='out-of-band'><div class='ghost'></div><div class='since' title='Stable since Rust version 1.7.0'>1.7.0</div><a class='srclink' href='https://doc.rust-lang.org/nightly/src/alloc/string.rs.html#785-787' title='goto source code'>[src]</a></span></h4>
<div class='docblock'><p>Converts a <code>String</code> into a mutable string slice.</p>
<h1 id="examples-1" class="section-header"><a href="#examples-1">Examples</a></h1>
<p>Basic usage:</p>
<pre class="rust rust-example-rendered">
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">s</span> <span class="op">=</span> <span class="ident">String</span>::<span class="ident">from</span>(<span class="string">&quot;foobar&quot;</span>);
<span class="kw">let</span> <span class="ident">s_mut_str</span> <span class="op">=</span> <span class="ident">s</span>.<span class="ident">as_mut_str</span>();
<span class="ident">s_mut_str</span>.<span class="ident">make_ascii_uppercase</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">&quot;FOOBAR&quot;</span>, <span class="ident">s_mut_str</span>);</pre>
</div><h4 id='method.push_str' class="method"><span id='push_str.v' class='invisible'><code>pub fn <a href='#method.push_str' class='fnname'>push_str</a>(&amp;mut self, string: &amp;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</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/alloc/string.rs.html#804-806' title='goto source code'>[src]</a></span></h4>
<div class='docblock'><p>Appends a given string slice onto the end of this <code>String</code>.</p>
<h1 id="examples-2" class="section-header"><a href="#examples-2">Examples</a></h1>
<p>Basic usage:</p>
<pre class="rust rust-example-rendered">
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">s</span> <span class="op">=</span> <span class="ident">String</span>::<span class="ident">from</span>(<span class="string">&quot;foo&quot;</span>);
<span class="ident">s</span>.<span class="ident">push_str</span>(<span class="string">&quot;bar&quot;</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">&quot;foobar&quot;</span>, <span class="ident">s</span>);</pre>
</div><h4 id='method.capacity' class="method"><span id='capacity.v' class='invisible'><code>pub 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></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/alloc/string.rs.html#821-823' title='goto source code'>[src]</a></span></h4>
<div class='docblock'><p>Returns this <code>String</code>'s capacity, in bytes.</p>
<h1 id="examples-3" class="section-header"><a href="#examples-3">Examples</a></h1>
<p>Basic usage:</p>
<pre class="rust rust-example-rendered">
<span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="ident">String</span>::<span class="ident">with_capacity</span>(<span class="number">10</span>);
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">s</span>.<span class="ident">capacity</span>() <span class="op">&gt;=</span> <span class="number">10</span>);</pre>
</div><h4 id='method.reserve' class="method"><span id='reserve.v' class='invisible'><code>pub 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></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/alloc/string.rs.html#872-874' title='goto source code'>[src]</a></span></h4>
<div class='docblock'><p>Ensures that this <code>String</code>'s capacity is at least <code>additional</code> bytes
larger than its length.</p>
<p>The capacity may be increased by more than <code>additional</code> bytes if it
chooses, to prevent frequent reallocations.</p>
<p>If you do not want this &quot;at least&quot; behavior, see the <a href="struct.String.html#method.reserve_exact"><code>reserve_exact</code></a>
method.</p>
<h1 id="panics" class="section-header"><a href="#panics">Panics</a></h1>
<p>Panics if the new capacity overflows <a href="../../std/primitive.usize.html"><code>usize</code></a>.</p>
<h1 id="examples-4" class="section-header"><a href="#examples-4">Examples</a></h1>
<p>Basic usage:</p>
<pre class="rust rust-example-rendered">
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">s</span> <span class="op">=</span> <span class="ident">String</span>::<span class="ident">new</span>();
<span class="ident">s</span>.<span class="ident">reserve</span>(<span class="number">10</span>);
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">s</span>.<span class="ident">capacity</span>() <span class="op">&gt;=</span> <span class="number">10</span>);</pre>
<p>This may not actually increase the capacity:</p>
<pre class="rust rust-example-rendered">
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">s</span> <span class="op">=</span> <span class="ident">String</span>::<span class="ident">with_capacity</span>(<span class="number">10</span>);
<span class="ident">s</span>.<span class="ident">push</span>(<span class="string">&#39;a&#39;</span>);
<span class="ident">s</span>.<span class="ident">push</span>(<span class="string">&#39;b&#39;</span>);
<span class="comment">// s now has a length of 2 and a capacity of 10</span>
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="number">2</span>, <span class="ident">s</span>.<span class="ident">len</span>());
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="number">10</span>, <span class="ident">s</span>.<span class="ident">capacity</span>());
<span class="comment">// Since we already have an extra 8 capacity, calling this...</span>
<span class="ident">s</span>.<span class="ident">reserve</span>(<span class="number">8</span>);
<span class="comment">// ... doesn&#39;t actually increase.</span>
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="number">10</span>, <span class="ident">s</span>.<span class="ident">capacity</span>());</pre>
</div><h4 id='method.reserve_exact' class="method"><span id='reserve_exact.v' class='invisible'><code>pub 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></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/alloc/string.rs.html#919-921' title='goto source code'>[src]</a></span></h4>
<div class='docblock'><p>Ensures that this <code>String</code>'s capacity is <code>additional</code> bytes
larger than its length.</p>
<p>Consider using the <a href="#method.reserve"><code>reserve</code></a> method unless you absolutely know
better than the allocator.</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-5" class="section-header"><a href="#examples-5">Examples</a></h1>
<p>Basic usage:</p>
<pre class="rust rust-example-rendered">
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">s</span> <span class="op">=</span> <span class="ident">String</span>::<span class="ident">new</span>();
<span class="ident">s</span>.<span class="ident">reserve_exact</span>(<span class="number">10</span>);
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">s</span>.<span class="ident">capacity</span>() <span class="op">&gt;=</span> <span class="number">10</span>);</pre>
<p>This may not actually increase the capacity:</p>
<pre class="rust rust-example-rendered">
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">s</span> <span class="op">=</span> <span class="ident">String</span>::<span class="ident">with_capacity</span>(<span class="number">10</span>);
<span class="ident">s</span>.<span class="ident">push</span>(<span class="string">&#39;a&#39;</span>);
<span class="ident">s</span>.<span class="ident">push</span>(<span class="string">&#39;b&#39;</span>);
<span class="comment">// s now has a length of 2 and a capacity of 10</span>
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="number">2</span>, <span class="ident">s</span>.<span class="ident">len</span>());
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="number">10</span>, <span class="ident">s</span>.<span class="ident">capacity</span>());
<span class="comment">// Since we already have an extra 8 capacity, calling this...</span>
<span class="ident">s</span>.<span class="ident">reserve_exact</span>(<span class="number">8</span>);
<span class="comment">// ... doesn&#39;t actually increase.</span>
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="number">10</span>, <span class="ident">s</span>.<span class="ident">capacity</span>());</pre>
</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>(&amp;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/alloc/string.rs.html#940-942' title='goto source code'>[src]</a></span></h4>
<div class='docblock'><p>Shrinks the capacity of this <code>String</code> to match its length.</p>
<h1 id="examples-6" class="section-header"><a href="#examples-6">Examples</a></h1>
<p>Basic usage:</p>
<pre class="rust rust-example-rendered">
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">s</span> <span class="op">=</span> <span class="ident">String</span>::<span class="ident">from</span>(<span class="string">&quot;foo&quot;</span>);
<span class="ident">s</span>.<span class="ident">reserve</span>(<span class="number">100</span>);
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">s</span>.<span class="ident">capacity</span>() <span class="op">&gt;=</span> <span class="number">100</span>);
<span class="ident">s</span>.<span class="ident">shrink_to_fit</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="number">3</span>, <span class="ident">s</span>.<span class="ident">capacity</span>());</pre>
</div><h4 id='method.push' class="method"><span id='push.v' class='invisible'><code>pub fn <a href='#method.push' class='fnname'>push</a>(&amp;mut self, ch: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.char.html">char</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/alloc/string.rs.html#963-968' title='goto source code'>[src]</a></span></h4>
<div class='docblock'><p>Appends the given <a href="../../std/primitive.char.html"><code>char</code></a> to the end of this <code>String</code>.</p>
<h1 id="examples-7" class="section-header"><a href="#examples-7">Examples</a></h1>
<p>Basic usage:</p>
<pre class="rust rust-example-rendered">
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">s</span> <span class="op">=</span> <span class="ident">String</span>::<span class="ident">from</span>(<span class="string">&quot;abc&quot;</span>);
<span class="ident">s</span>.<span class="ident">push</span>(<span class="string">&#39;1&#39;</span>);
<span class="ident">s</span>.<span class="ident">push</span>(<span class="string">&#39;2&#39;</span>);
<span class="ident">s</span>.<span class="ident">push</span>(<span class="string">&#39;3&#39;</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">&quot;abc123&quot;</span>, <span class="ident">s</span>);</pre>
</div><h4 id='method.as_bytes' 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.slice.html">&amp;'a [</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">]</a></span></div><div class="content hidden"><h3 class="important">Important traits for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">&amp;'a [</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">]</a></h3><code class="content"><span class="where fmt-newline">impl&lt;'a&gt; <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.slice.html">&amp;'a [</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">]</a></span><span class="where fmt-newline">impl&lt;'a&gt; <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.slice.html">&amp;'a mut [</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">]</a></span></code></div></div><span id='as_bytes.v' class='invisible'><code>pub fn <a href='#method.as_bytes' class='fnname'>as_bytes</a>(&amp;self) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">&amp;[</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.slice.html">]</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/alloc/string.rs.html#987-989' title='goto source code'>[src]</a></span></h4>
<div class='docblock'><p>Returns a byte slice of this <code>String</code>'s contents.</p>
<p>The inverse of this method is <a href="#method.from_utf8"><code>from_utf8</code></a>.</p>
<h1 id="examples-8" class="section-header"><a href="#examples-8">Examples</a></h1>
<p>Basic usage:</p>
<pre class="rust rust-example-rendered">
<span class="kw">let</span> <span class="ident">s</span> <span class="op">=</span> <span class="ident">String</span>::<span class="ident">from</span>(<span class="string">&quot;hello&quot;</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="kw-2">&amp;</span>[<span class="number">104</span>, <span class="number">101</span>, <span class="number">108</span>, <span class="number">108</span>, <span class="number">111</span>], <span class="ident">s</span>.<span class="ident">as_bytes</span>());</pre>
</div><h4 id='method.truncate' class="method"><span id='truncate.v' class='invisible'><code>pub fn <a href='#method.truncate' class='fnname'>truncate</a>(&amp;mut self, new_len: <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/alloc/string.rs.html#1018-1023' title='goto source code'>[src]</a></span></h4>
<div class='docblock'><p>Shortens this <code>String</code> to the specified length.</p>
<p>If <code>new_len</code> is greater than the string's current length, this has no
effect.</p>
<p>Note that this method has no effect on the allocated capacity
of the string</p>
<h1 id="panics-2" class="section-header"><a href="#panics-2">Panics</a></h1>
<p>Panics if <code>new_len</code> does not lie on a <a href="../../std/primitive.char.html"><code>char</code></a> boundary.</p>
<h1 id="examples-9" class="section-header"><a href="#examples-9">Examples</a></h1>
<p>Basic usage:</p>
<pre class="rust rust-example-rendered">
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">s</span> <span class="op">=</span> <span class="ident">String</span>::<span class="ident">from</span>(<span class="string">&quot;hello&quot;</span>);
<span class="ident">s</span>.<span class="ident">truncate</span>(<span class="number">2</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">&quot;he&quot;</span>, <span class="ident">s</span>);</pre>
</div><h4 id='method.pop' class="method"><span id='pop.v' class='invisible'><code>pub 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="enum core::option::Option">Option</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.char.html">char</a>&gt;</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/alloc/string.rs.html#1046-1053' title='goto source code'>[src]</a></span></h4>
<div class='docblock'><p>Removes the last character from the string buffer and returns it.</p>
<p>Returns <a href="../../std/option/enum.Option.html#variant.None"><code>None</code></a> if this <code>String</code> is empty.</p>
<h1 id="examples-10" class="section-header"><a href="#examples-10">Examples</a></h1>
<p>Basic usage:</p>
<pre class="rust rust-example-rendered">
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">s</span> <span class="op">=</span> <span class="ident">String</span>::<span class="ident">from</span>(<span class="string">&quot;foo&quot;</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">s</span>.<span class="ident">pop</span>(), <span class="prelude-val">Some</span>(<span class="string">&#39;o&#39;</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">s</span>.<span class="ident">pop</span>(), <span class="prelude-val">Some</span>(<span class="string">&#39;o&#39;</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">s</span>.<span class="ident">pop</span>(), <span class="prelude-val">Some</span>(<span class="string">&#39;f&#39;</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">s</span>.<span class="ident">pop</span>(), <span class="prelude-val">None</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>(&amp;mut self, idx: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.char.html">char</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/alloc/string.rs.html#1080-1095' title='goto source code'>[src]</a></span></h4>
<div class='docblock'><p>Removes a <a href="../../std/primitive.char.html"><code>char</code></a> from this <code>String</code> at a byte position and returns it.</p>
<p>This is an <code>O(n)</code> operation, as it requires copying every element in the
buffer.</p>
<h1 id="panics-3" class="section-header"><a href="#panics-3">Panics</a></h1>
<p>Panics if <code>idx</code> is larger than or equal to the <code>String</code>'s length,
or if it does not lie on a <a href="../../std/primitive.char.html"><code>char</code></a> boundary.</p>
<h1 id="examples-11" class="section-header"><a href="#examples-11">Examples</a></h1>
<p>Basic usage:</p>
<pre class="rust rust-example-rendered">
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">s</span> <span class="op">=</span> <span class="ident">String</span>::<span class="ident">from</span>(<span class="string">&quot;foo&quot;</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">s</span>.<span class="ident">remove</span>(<span class="number">0</span>), <span class="string">&#39;f&#39;</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">s</span>.<span class="ident">remove</span>(<span class="number">1</span>), <span class="string">&#39;o&#39;</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">s</span>.<span class="ident">remove</span>(<span class="number">0</span>), <span class="string">&#39;o&#39;</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>&lt;F&gt;(&amp;mut self, f: F) <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;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.char.html">char</a>) -&gt; <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a>,&nbsp;</span></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='https://doc.rust-lang.org/nightly/src/alloc/string.rs.html#1116-1146' title='goto source code'>[src]</a></span></h4>
<div class='stability'><div class='stab unstable'><span class=microscope>🔬</span> This is a nightly-only experimental API. (<code>string_retain</code>)</div></div><div class='docblock'><p>Retains only the characters specified by the predicate.</p>
<p>In other words, remove all characters <code>c</code> such that <code>f(c)</code> returns <code>false</code>.
This method operates in place and preserves the order of the retained
characters.</p>
<h1 id="examples-12" class="section-header"><a href="#examples-12">Examples</a></h1>
<pre class="rust rust-example-rendered">
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">string_retain</span>)]</span>
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">s</span> <span class="op">=</span> <span class="ident">String</span>::<span class="ident">from</span>(<span class="string">&quot;f_o_ob_ar&quot;</span>);
<span class="ident">s</span>.<span class="ident">retain</span>(<span class="op">|</span><span class="ident">c</span><span class="op">|</span> <span class="ident">c</span> <span class="op">!=</span> <span class="string">&#39;_&#39;</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">s</span>, <span class="string">&quot;foobar&quot;</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>(&amp;mut self, idx: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>, ch: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.char.html">char</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/alloc/string.rs.html#1175-1183' title='goto source code'>[src]</a></span></h4>
<div class='docblock'><p>Inserts a character into this <code>String</code> at a byte position.</p>
<p>This is an <code>O(n)</code> operation as it requires copying every element in the
buffer.</p>
<h1 id="panics-4" class="section-header"><a href="#panics-4">Panics</a></h1>
<p>Panics if <code>idx</code> is larger than the <code>String</code>'s length, or if it does not
lie on a <a href="../../std/primitive.char.html"><code>char</code></a> boundary.</p>
<h1 id="examples-13" class="section-header"><a href="#examples-13">Examples</a></h1>
<p>Basic usage:</p>
<pre class="rust rust-example-rendered">
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">s</span> <span class="op">=</span> <span class="ident">String</span>::<span class="ident">with_capacity</span>(<span class="number">3</span>);
<span class="ident">s</span>.<span class="ident">insert</span>(<span class="number">0</span>, <span class="string">&#39;f&#39;</span>);
<span class="ident">s</span>.<span class="ident">insert</span>(<span class="number">1</span>, <span class="string">&#39;o&#39;</span>);
<span class="ident">s</span>.<span class="ident">insert</span>(<span class="number">2</span>, <span class="string">&#39;o&#39;</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">&quot;foo&quot;</span>, <span class="ident">s</span>);</pre>
</div><h4 id='method.insert_str' class="method"><span id='insert_str.v' class='invisible'><code>pub fn <a href='#method.insert_str' class='fnname'>insert_str</a>(&amp;mut self, idx: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>, string: &amp;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a>)</code></span><span class='out-of-band'><div class='ghost'></div><div class='since' title='Stable since Rust version 1.16.0'>1.16.0</div><a class='srclink' href='https://doc.rust-lang.org/nightly/src/alloc/string.rs.html#1224-1230' title='goto source code'>[src]</a></span></h4>
<div class='docblock'><p>Inserts a string slice into this <code>String</code> at a byte position.</p>
<p>This is an <code>O(n)</code> operation as it requires copying every element in the
buffer.</p>
<h1 id="panics-5" class="section-header"><a href="#panics-5">Panics</a></h1>
<p>Panics if <code>idx</code> is larger than the <code>String</code>'s length, or if it does not
lie on a <a href="../../std/primitive.char.html"><code>char</code></a> boundary.</p>
<h1 id="examples-14" class="section-header"><a href="#examples-14">Examples</a></h1>
<p>Basic usage:</p>
<pre class="rust rust-example-rendered">
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">s</span> <span class="op">=</span> <span class="ident">String</span>::<span class="ident">from</span>(<span class="string">&quot;bar&quot;</span>);
<span class="ident">s</span>.<span class="ident">insert_str</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="string">&quot;foobar&quot;</span>, <span class="ident">s</span>);</pre>
</div><h4 id='method.as_mut_vec' 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/alloc/vec/struct.Vec.html" title="struct alloc::vec::Vec">Vec</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a>&gt;</span></div><div class="content hidden"><h3 class="important">Important traits for <a class="struct" href="https://doc.rust-lang.org/nightly/alloc/vec/struct.Vec.html" title="struct alloc::vec::Vec">Vec</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a>&gt;</h3><code class="content"><span class="where fmt-newline">impl <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="struct" href="https://doc.rust-lang.org/nightly/alloc/vec/struct.Vec.html" title="struct alloc::vec::Vec">Vec</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a>&gt;</span></code></div></div><span id='as_mut_vec.v' class='invisible'><code>pub unsafe fn <a href='#method.as_mut_vec' class='fnname'>as_mut_vec</a>(&amp;mut self) -&gt; &amp;mut <a class="struct" href="https://doc.rust-lang.org/nightly/alloc/vec/struct.Vec.html" title="struct alloc::vec::Vec">Vec</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a>&gt;</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/alloc/string.rs.html#1258-1260' title='goto source code'>[src]</a></span></h4>
<div class='docblock'><p>Returns a mutable reference to the contents of this <code>String</code>.</p>
<h1 id="safety" class="section-header"><a href="#safety">Safety</a></h1>
<p>This function is unsafe because it does not check that the bytes passed
to it are valid UTF-8. If this constraint is violated, it may cause
memory unsafety issues with future users of the <code>String</code>, as the rest of
the standard library assumes that <code>String</code>s are valid UTF-8.</p>
<h1 id="examples-15" class="section-header"><a href="#examples-15">Examples</a></h1>
<p>Basic usage:</p>
<pre class="rust rust-example-rendered">
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">s</span> <span class="op">=</span> <span class="ident">String</span>::<span class="ident">from</span>(<span class="string">&quot;hello&quot;</span>);
<span class="kw">unsafe</span> {
<span class="kw">let</span> <span class="ident">vec</span> <span class="op">=</span> <span class="ident">s</span>.<span class="ident">as_mut_vec</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="kw-2">&amp;</span>[<span class="number">104</span>, <span class="number">101</span>, <span class="number">108</span>, <span class="number">108</span>, <span class="number">111</span>][..], <span class="kw-2">&amp;</span><span class="ident">vec</span>[..]);
<span class="ident">vec</span>.<span class="ident">reverse</span>();
}
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">s</span>, <span class="string">&quot;olleh&quot;</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>(&amp;self) -&gt; <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/alloc/string.rs.html#1275-1277' title='goto source code'>[src]</a></span></h4>
<div class='docblock'><p>Returns the length of this <code>String</code>, in bytes.</p>
<h1 id="examples-16" class="section-header"><a href="#examples-16">Examples</a></h1>
<p>Basic usage:</p>
<pre class="rust rust-example-rendered">
<span class="kw">let</span> <span class="ident">a</span> <span class="op">=</span> <span class="ident">String</span>::<span class="ident">from</span>(<span class="string">&quot;foo&quot;</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 id='is_empty.v' class='invisible'><code>pub 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></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/alloc/string.rs.html#1296-1298' title='goto source code'>[src]</a></span></h4>
<div class='docblock'><p>Returns <code>true</code> if this <code>String</code> has a length of zero.</p>
<p>Returns <code>false</code> otherwise.</p>
<h1 id="examples-17" class="section-header"><a href="#examples-17">Examples</a></h1>
<p>Basic usage:</p>
<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">String</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="string">&#39;a&#39;</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 id='split_off.v' class='invisible'><code>pub 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/alloc/string/struct.String.html" title="struct alloc::string::String">String</a></code></span><span class='out-of-band'><div class='ghost'></div><div class='since' title='Stable since Rust version 1.16.0'>1.16.0</div><a class='srclink' href='https://doc.rust-lang.org/nightly/src/alloc/string.rs.html#1325-1329' title='goto source code'>[src]</a></span></h4>
<div class='docblock'><p>Splits the string into two at the given index.</p>
<p>Returns a newly allocated <code>String</code>. <code>self</code> contains bytes <code>[0, at)</code>, and
the returned <code>String</code> contains bytes <code>[at, len)</code>. <code>at</code> must be on the
boundary of a UTF-8 code point.</p>
<p>Note that the capacity of <code>self</code> does not change.</p>
<h1 id="panics-6" class="section-header"><a href="#panics-6">Panics</a></h1>
<p>Panics if <code>at</code> is not on a <code>UTF-8</code> code point boundary, or if it is beyond the last
code point of the string.</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">hello</span> <span class="op">=</span> <span class="ident">String</span>::<span class="ident">from</span>(<span class="string">&quot;Hello, World!&quot;</span>);
<span class="kw">let</span> <span class="ident">world</span> <span class="op">=</span> <span class="ident">hello</span>.<span class="ident">split_off</span>(<span class="number">7</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">hello</span>, <span class="string">&quot;Hello, &quot;</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">world</span>, <span class="string">&quot;World!&quot;</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>(&amp;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/alloc/string.rs.html#1351-1353' title='goto source code'>[src]</a></span></h4>
<div class='docblock'><p>Truncates this <code>String</code>, removing all contents.</p>
<p>While this means the <code>String</code> will have a length of zero, it does not
touch its capacity.</p>
<h1 id="examples-19" class="section-header"><a href="#examples-19">Examples</a></h1>
<p>Basic usage:</p>
<pre class="rust rust-example-rendered">
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">s</span> <span class="op">=</span> <span class="ident">String</span>::<span class="ident">from</span>(<span class="string">&quot;foo&quot;</span>);
<span class="ident">s</span>.<span class="ident">clear</span>();
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">s</span>.<span class="ident">is_empty</span>());
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="number">0</span>, <span class="ident">s</span>.<span class="ident">len</span>());
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="number">3</span>, <span class="ident">s</span>.<span class="ident">capacity</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/alloc/string/struct.Drain.html" title="struct alloc::string::Drain">Drain</a>&lt;'a&gt;</span></div><div class="content hidden"><h3 class="important">Important traits for <a class="struct" href="https://doc.rust-lang.org/nightly/alloc/string/struct.Drain.html" title="struct alloc::string::Drain">Drain</a>&lt;'a&gt;</h3><code class="content"><span class="where fmt-newline">impl&lt;'a&gt; <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/alloc/string/struct.Drain.html" title="struct alloc::string::Drain">Drain</a>&lt;'a&gt;</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.char.html">char</a>;</span></code></div></div><span id='drain.v' class='invisible'><code>pub 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/alloc/string/struct.Drain.html" title="struct alloc::string::Drain">Drain</a> <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;R: <a class="trait" href="https://doc.rust-lang.org/nightly/alloc/range/trait.RangeArgument.html" title="trait alloc::range::RangeArgument">RangeArgument</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>&gt;,&nbsp;</span></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/alloc/string.rs.html#1386-1419' title='goto source code'>[src]</a></span></h4>
<div class='docblock'><p>Creates a draining iterator that removes the specified range in the string
and yields the removed chars.</p>
<p>Note: The element range is removed even if the iterator is not
consumed until the end.</p>
<h1 id="panics-7" class="section-header"><a href="#panics-7">Panics</a></h1>
<p>Panics if the starting point or end point do not lie on a <a href="../../std/primitive.char.html"><code>char</code></a>
boundary, or if they're out of bounds.</p>
<h1 id="examples-20" class="section-header"><a href="#examples-20">Examples</a></h1>
<p>Basic usage:</p>
<pre class="rust rust-example-rendered">
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">s</span> <span class="op">=</span> <span class="ident">String</span>::<span class="ident">from</span>(<span class="string">&quot;α is alpha, β is beta&quot;</span>);
<span class="kw">let</span> <span class="ident">beta_offset</span> <span class="op">=</span> <span class="ident">s</span>.<span class="ident">find</span>(<span class="string">&#39;β&#39;</span>).<span class="ident">unwrap_or</span>(<span class="ident">s</span>.<span class="ident">len</span>());
<span class="comment">// Remove the range up until the β from the string</span>
<span class="kw">let</span> <span class="ident">t</span>: <span class="ident">String</span> <span class="op">=</span> <span class="ident">s</span>.<span class="ident">drain</span>(..<span class="ident">beta_offset</span>).<span class="ident">collect</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">t</span>, <span class="string">&quot;α is alpha, &quot;</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">s</span>, <span class="string">&quot;β is beta&quot;</span>);
<span class="comment">// A full range clears the string</span>
<span class="ident">s</span>.<span class="ident">drain</span>(..);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">s</span>, <span class="string">&quot;&quot;</span>);</pre>
</div><h4 id='method.splice' class="method"><span id='splice.v' class='invisible'><code>pub fn <a href='#method.splice' class='fnname'>splice</a>&lt;R&gt;(&amp;mut self, range: R, replace_with: &amp;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a>) <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;R: <a class="trait" href="https://doc.rust-lang.org/nightly/alloc/range/trait.RangeArgument.html" title="trait alloc::range::RangeArgument">RangeArgument</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>&gt;,&nbsp;</span></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='https://doc.rust-lang.org/nightly/src/alloc/string.rs.html#1450-1472' title='goto source code'>[src]</a></span></h4>
<div class='stability'><div class='stab unstable'><details><summary><span class=microscope>🔬</span> This is a nightly-only experimental API. (<code>splice</code>)</summary><p>recently added</p>
</details></div></div><div class='docblock'><p>Creates a splicing iterator that removes the specified range in the string,
and replaces it with the given string.
The given string doesn't need to be the same length as the range.</p>
<p>Note: Unlike <a href="../../std/vec/struct.Vec.html#method.splice"><code>Vec::splice</code></a>, the replacement happens eagerly, and this
method does not return the removed chars.</p>
<h1 id="panics-8" class="section-header"><a href="#panics-8">Panics</a></h1>
<p>Panics if the starting point or end point do not lie on a <a href="../../std/primitive.char.html"><code>char</code></a>
boundary, or if they're out of bounds.</p>
<h1 id="examples-21" class="section-header"><a href="#examples-21">Examples</a></h1>
<p>Basic usage:</p>
<pre class="rust rust-example-rendered">
<span class="attribute">#![<span class="ident">feature</span>(<span class="ident">splice</span>)]</span>
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">s</span> <span class="op">=</span> <span class="ident">String</span>::<span class="ident">from</span>(<span class="string">&quot;α is alpha, β is beta&quot;</span>);
<span class="kw">let</span> <span class="ident">beta_offset</span> <span class="op">=</span> <span class="ident">s</span>.<span class="ident">find</span>(<span class="string">&#39;β&#39;</span>).<span class="ident">unwrap_or</span>(<span class="ident">s</span>.<span class="ident">len</span>());
<span class="comment">// Replace the range up until the β from the string</span>
<span class="ident">s</span>.<span class="ident">splice</span>(..<span class="ident">beta_offset</span>, <span class="string">&quot;Α is capital alpha; &quot;</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">s</span>, <span class="string">&quot;Α is capital alpha; β is beta&quot;</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 <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="../../hyper/header/struct.From.html" title="struct hyper::header::From">From</a></code><a href='#impl-Clone' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/hyper/header/common/mod.rs.html#257' 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>(&amp;self) -&gt; <a class="struct" href="../../hyper/header/struct.From.html" title="struct hyper::header::From">From</a></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/hyper/header/common/mod.rs.html#257' 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>(&amp;mut self, source: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;</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 <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="../../hyper/header/struct.From.html" title="struct hyper::header::From">From</a></code><a href='#impl-Debug' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/hyper/header/common/mod.rs.html#257' 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>(&amp;self, __arg_0: &amp;mut <a class="struct" href="https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a>) -&gt; <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/hyper/header/common/mod.rs.html#257' title='goto source code'>[src]</a></span></h4>
<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>
</div></div><h3 id='impl-PartialEq' class='impl'><span class='in-band'><code>impl <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="../../hyper/header/struct.From.html" title="struct hyper::header::From">From</a></code><a href='#impl-PartialEq' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/hyper/header/common/mod.rs.html#257' title='goto source code'>[src]</a></span></h3>
<div class='impl-items'><h4 id='method.eq' class="method"><span id='eq.v' class='invisible'><code>fn <a href='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="../../hyper/header/struct.From.html" title="struct hyper::header::From">From</a>) -&gt; <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/hyper/header/common/mod.rs.html#257' title='goto source code'>[src]</a></span></h4>
<div class='docblock'><p>This method tests for <code>self</code> and <code>other</code> values to be equal, and is used by <code>==</code>. <a href="https://doc.rust-lang.org/nightly/core/cmp/trait.PartialEq.html#tymethod.eq">Read more</a></p>
</div><h4 id='method.ne' class="method"><span id='ne.v' class='invisible'><code>fn <a href='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="../../hyper/header/struct.From.html" title="struct hyper::header::From">From</a>) -&gt; <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/hyper/header/common/mod.rs.html#257' title='goto source code'>[src]</a></span></h4>
<div class='docblock'><p>This method tests for <code>!=</code>.</p>
</div></div><h3 id='impl-Deref' class='impl'><span class='in-band'><code>impl <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="../../hyper/header/struct.From.html" title="struct hyper::header::From">From</a></code><a href='#impl-Deref' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/hyper/header/common/mod.rs.html#104-111' title='goto source code'>[src]</a></span></h3>
<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/alloc/string/struct.String.html" title="struct alloc::string::String">String</a></code></span></h4>
<div class='docblock'><p>The resulting type after dereferencing.</p>
</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>(&amp;self) -&gt; &amp;<a class="struct" href="https://doc.rust-lang.org/nightly/alloc/string/struct.String.html" title="struct alloc::string::String">String</a></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/hyper/header/common/mod.rs.html#108-110' title='goto source code'>[src]</a></span></h4>
<div class='docblock'><p>Dereferences the value.</p>
</div></div><h3 id='impl-DerefMut' class='impl'><span class='in-band'><code>impl <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="../../hyper/header/struct.From.html" title="struct hyper::header::From">From</a></code><a href='#impl-DerefMut' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/hyper/header/common/mod.rs.html#113-118' title='goto source code'>[src]</a></span></h3>
<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>(&amp;mut self) -&gt; &amp;mut <a class="struct" href="https://doc.rust-lang.org/nightly/alloc/string/struct.String.html" title="struct alloc::string::String">String</a></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/hyper/header/common/mod.rs.html#115-117' title='goto source code'>[src]</a></span></h4>
<div class='docblock'><p>Mutably dereferences the value.</p>
</div></div><h3 id='impl-Header' class='impl'><span class='in-band'><code>impl <a class="trait" href="../../hyper/header/trait.Header.html" title="trait hyper::header::Header">Header</a> for <a class="struct" href="../../hyper/header/struct.From.html" title="struct hyper::header::From">From</a></code><a href='#impl-Header' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/hyper/header/common/mod.rs.html#260-274' title='goto source code'>[src]</a></span></h3>
<div class='impl-items'><h4 id='method.header_name' class="method"><span id='header_name.v' class='invisible'><code>fn <a href='../../hyper/header/trait.Header.html#tymethod.header_name' class='fnname'>header_name</a>() -&gt; &amp;'static <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/hyper/header/common/mod.rs.html#262-265' title='goto source code'>[src]</a></span></h4>
<div class='docblock'><p>Returns the name of the header field this belongs to. <a href="../../hyper/header/trait.Header.html#tymethod.header_name">Read more</a></p>
</div><h4 id='method.parse_header' class="method"><span id='parse_header.v' class='invisible'><code>fn <a href='../../hyper/header/trait.Header.html#tymethod.parse_header' class='fnname'>parse_header</a>(raw: &amp;<a class="struct" href="../../hyper/header/struct.Raw.html" title="struct hyper::header::Raw">Raw</a>) -&gt; <a class="type" href="../../hyper/error/type.Result.html" title="type hyper::error::Result">Result</a>&lt;Self&gt;</code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/hyper/header/common/mod.rs.html#267-269' title='goto source code'>[src]</a></span></h4>
<div class='docblock'><p>Parse a header from a raw stream of bytes. <a href="../../hyper/header/trait.Header.html#tymethod.parse_header">Read more</a></p>
</div><h4 id='method.fmt_header' class="method"><span id='fmt_header.v' class='invisible'><code>fn <a href='../../hyper/header/trait.Header.html#tymethod.fmt_header' class='fnname'>fmt_header</a>(&amp;self, f: &amp;mut <a class="struct" href="../../hyper/header/struct.Formatter.html" title="struct hyper::header::Formatter">Formatter</a>) -&gt; <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/hyper/header/common/mod.rs.html#271-273' title='goto source code'>[src]</a></span></h4>
<div class='docblock'><p>Format a header to outgoing stream. <a href="../../hyper/header/trait.Header.html#tymethod.fmt_header">Read more</a></p>
</div></div><h3 id='impl-Display' class='impl'><span class='in-band'><code>impl <a class="trait" href="https://doc.rust-lang.org/nightly/core/fmt/trait.Display.html" title="trait core::fmt::Display">Display</a> for <a class="struct" href="../../hyper/header/struct.From.html" title="struct hyper::header::From">From</a></code><a href='#impl-Display' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/hyper/header/common/mod.rs.html#275-280' title='goto source code'>[src]</a></span></h3>
<div class='impl-items'><h4 id='method.fmt-1' class="method"><span id='fmt.v-1' class='invisible'><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="struct core::fmt::Formatter">Formatter</a>) -&gt; <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/hyper/header/common/mod.rs.html#277-279' title='goto source code'>[src]</a></span></h4>
<div class='docblock'><p>Formats the value using the given formatter. <a href="https://doc.rust-lang.org/nightly/core/fmt/trait.Display.html#tymethod.fmt">Read more</a></p>
</div></div></section>
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