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<p class='location'>Trait DoubleEndedSearcher</p><div class="block items"><ul><li><a href="#implementors">Implementors</a></li></ul></div><p class='location'><a href='../../index.html'>collections</a>::<wbr><a href='../index.html'>str</a>::<wbr><a href='index.html'>pattern</a></p><script>window.sidebarCurrent = {name: 'DoubleEndedSearcher', ty: 'trait', relpath: ''};</script><script defer src="sidebar-items.js"></script>
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<h1 class='fqn'><span class='in-band'>Trait <a href='../../index.html'>collections</a>::<wbr><a href='../index.html'>str</a>::<wbr><a href='index.html'>pattern</a>::<wbr><a class="trait" href=''>DoubleEndedSearcher</a></span><span class='out-of-band'><span class='since' title='Stable since Rust version '></span><span id='render-detail'>
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<pre class='rust trait'>pub trait DoubleEndedSearcher<'a>: <a class="trait" href="../../../collections/str/pattern/trait.ReverseSearcher.html" title="trait collections::str::pattern::ReverseSearcher">ReverseSearcher</a><'a> { }</pre><div class='stability'><div class='stab unstable'><details><summary><span class=microscope>🔬</span> This is a nightly-only experimental API. (<code>pattern </code><a href="https://github.com/rust-lang/rust/issues/27721">#27721</a>)</summary><p>API not fully fleshed out and ready to be stabilized</p>
</details></div></div><div class='docblock'><p>A marker trait to express that a <code>ReverseSearcher</code>
can be used for a <code>DoubleEndedIterator</code> implementation.</p>
<p>For this, the impl of <code>Searcher</code> and <code>ReverseSearcher</code> need
to follow these conditions:</p>
<ul>
<li>All results of <code>next()</code> need to be identical
to the results of <code>next_back()</code> in reverse order.</li>
<li><code>next()</code> and <code>next_back()</code> need to behave as
the two ends of a range of values, that is they
can not "walk past each other".</li>
</ul>
<h1 id='examples' class='section-header'><a href='#examples'>Examples</a></h1>
<p><code>char::Searcher</code> is a <code>DoubleEndedSearcher</code> because searching for a
<code>char</code> only requires looking at one at a time, which behaves the same
from both ends.</p>
<p><code>(&str)::Searcher</code> is not a <code>DoubleEndedSearcher</code> because
the pattern <code>"aa"</code> in the haystack <code>"aaa"</code> matches as either
<code>"[aa]a"</code> or <code>"a[aa]"</code>, depending from which side it is searched.</p>
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<h2 id='implementors'>Implementors</h2>
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<li><code>impl<'a, F> DoubleEndedSearcher<'a> for <a class="struct" href="../../../collections/str/pattern/struct.CharPredicateSearcher.html" title="struct collections::str::pattern::CharPredicateSearcher">CharPredicateSearcher</a><'a, F> <span class="where fmt-newline">where<br> F: <a class="trait" href="../../../core/ops/trait.FnMut.html" title="trait core::ops::FnMut">FnMut</a>(char) -> bool, </span></code></li>
<li><code>impl<'a> DoubleEndedSearcher<'a> for <a class="struct" href="../../../collections/str/pattern/struct.CharSearcher.html" title="struct collections::str::pattern::CharSearcher">CharSearcher</a><'a></code></li>
<li><code>impl<'a, 'b> DoubleEndedSearcher<'a> for <a class="struct" href="../../../collections/str/pattern/struct.CharSliceSearcher.html" title="struct collections::str::pattern::CharSliceSearcher">CharSliceSearcher</a><'a, 'b></code></li>
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