156 lines
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156 lines
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<h1 class='fqn'><span class='in-band'>Function <a href='index.html'>itertools</a>::<wbr><a class="fn" href=''>rciter</a></span><span class='out-of-band'><span id='render-detail'>
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[<span class='inner'>−</span>]
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</span><a class='srclink' href='../src/itertools/rciter_impl.rs.html#47-51' title='goto source code'>[src]</a></span></h1>
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<div class="important-traits"><div class='tooltip'>ⓘ<span class='tooltiptext'>Important traits for <a class="struct" href="../itertools/structs/struct.RcIter.html" title="struct itertools::structs::RcIter">RcIter</a><I></span></div><div class="content hidden"><h3 class="important">Important traits for <a class="struct" href="../itertools/structs/struct.RcIter.html" title="struct itertools::structs::RcIter">RcIter</a><I></h3><code class="content"><span class="where fmt-newline">impl<A, I> <a class="trait" href="https://doc.rust-lang.org/nightly/core/iter/iterator/trait.Iterator.html" title="trait core::iter::iterator::Iterator">Iterator</a> for <a class="struct" href="../itertools/structs/struct.RcIter.html" title="struct itertools::structs::RcIter">RcIter</a><I> <span class="where fmt-newline">where<br> I: <a class="trait" href="https://doc.rust-lang.org/nightly/core/iter/iterator/trait.Iterator.html" title="trait core::iter::iterator::Iterator">Iterator</a><Item = A>, </span></span><span class="where fmt-newline"> type <a href='https://doc.rust-lang.org/nightly/core/iter/iterator/trait.Iterator.html#associatedtype.Item' class="type">Item</a> = A;</span></code></div></div><pre class='rust fn'>pub fn rciter<I>(iterable: I) -> <a class="struct" href="../itertools/structs/struct.RcIter.html" title="struct itertools::structs::RcIter">RcIter</a><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>> <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>, </span></pre><div class='docblock'><p>Return an iterator inside a <code>Rc<RefCell<_>></code> wrapper.</p>
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<p>The returned <code>RcIter</code> can be cloned, and each clone will refer back to the
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same original iterator.</p>
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<p><code>RcIter</code> allows doing interesting things like using <code>.zip()</code> on an iterator with
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itself, at the cost of runtime borrow checking which may have a performance
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penalty.</p>
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<p>Iterator element type is <code>Self::Item</code>.</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">rciter</span>;
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<span class="kw">use</span> <span class="ident">itertools</span>::<span class="ident">zip</span>;
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<span class="comment">// In this example a range iterator is created and we iterate it using</span>
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<span class="comment">// three separate handles (two of them given to zip).</span>
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<span class="comment">// We also use the IntoIterator implementation for `&RcIter`.</span>
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<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">iter</span> <span class="op">=</span> <span class="ident">rciter</span>(<span class="number">0</span>..<span class="number">9</span>);
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<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">z</span> <span class="op">=</span> <span class="ident">zip</span>(<span class="kw-2">&</span><span class="ident">iter</span>, <span class="kw-2">&</span><span class="ident">iter</span>);
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">z</span>.<span class="ident">next</span>(), <span class="prelude-val">Some</span>((<span class="number">0</span>, <span class="number">1</span>)));
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">z</span>.<span class="ident">next</span>(), <span class="prelude-val">Some</span>((<span class="number">2</span>, <span class="number">3</span>)));
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">z</span>.<span class="ident">next</span>(), <span class="prelude-val">Some</span>((<span class="number">4</span>, <span class="number">5</span>)));
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">iter</span>.<span class="ident">next</span>(), <span class="prelude-val">Some</span>(<span class="number">6</span>));
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">z</span>.<span class="ident">next</span>(), <span class="prelude-val">Some</span>((<span class="number">7</span>, <span class="number">8</span>)));
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<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">z</span>.<span class="ident">next</span>(), <span class="prelude-val">None</span>);</pre>
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<p><strong>Panics</strong> in iterator methods if a borrow error is encountered in the
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iterator methods. It can only happen if the <code>RcIter</code> is reentered in
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<code>.next()</code>, i.e. if it somehow participates in an “iterator knot”
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where it is an adaptor of itself.</p>
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