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<h1 class='fqn'><span class='in-band'>Function <a href='index.html'>itertools</a>::<wbr><a class="fn" href=''>partition</a></span><span class='out-of-band'><span id='render-detail'>
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</span><a class='srclink' href='../src/itertools/lib.rs.html#2071-2093' title='goto source code'>[src]</a></span></h1>
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<pre class='rust fn'>pub fn partition<'a, A: 'a, I, F>(iter: I, pred: F) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a> <span class="where fmt-newline">where<br> I: <a class="trait" href="https://doc.rust-lang.org/nightly/core/iter/traits/trait.IntoIterator.html" title="trait core::iter::traits::IntoIterator">IntoIterator</a><Item = <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&'a mut </a>A>,<br> I::<a class="type" href="https://doc.rust-lang.org/nightly/core/iter/traits/trait.IntoIterator.html#associatedtype.IntoIter" title="type core::iter::traits::IntoIterator::IntoIter">IntoIter</a>: <a class="trait" href="https://doc.rust-lang.org/nightly/core/iter/traits/trait.DoubleEndedIterator.html" title="trait core::iter::traits::DoubleEndedIterator">DoubleEndedIterator</a>,<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnMut.html" title="trait core::ops::function::FnMut">FnMut</a>(<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&</a>A) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a>, </span></pre><div class='docblock'><p>Partition a sequence using predicate <code>pred</code> so that elements
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that map to <code>true</code> are placed before elements which map to <code>false</code>.</p>
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<p>The order within the partitions is arbitrary.</p>
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<p>Return the index of the split point.</p>
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<pre class="rust rust-example-rendered">
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<span class="kw">use</span> <span class="ident">itertools</span>::<span class="ident">partition</span>;
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<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">data</span> <span class="op">=</span> [<span class="number">7</span>, <span class="number">1</span>, <span class="number">1</span>, <span class="number">7</span>, <span class="number">1</span>, <span class="number">1</span>, <span class="number">7</span>];
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<span class="kw">let</span> <span class="ident">split_index</span> <span class="op">=</span> <span class="ident">partition</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">data</span>, <span class="op">|</span><span class="ident">elt</span><span class="op">|</span> <span class="kw-2">*</span><span class="ident">elt</span> <span class="op">>=</span> <span class="number">3</span>);
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">data</span>, [<span class="number">7</span>, <span class="number">7</span>, <span class="number">7</span>, <span class="number">1</span>, <span class="number">1</span>, <span class="number">1</span>, <span class="number">1</span>]);
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">split_index</span>, <span class="number">3</span>);</pre>
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