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<h1 class='fqn'><span class='in-band'>Function <a href='index.html'>itertools</a>::<wbr><a class="fn" href=''>repeat_call</a></span><span class='out-of-band'><span id='render-detail'>
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</span><a class='srclink' href='../src/itertools/sources.rs.html#39-43' 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.RepeatCall.html" title="struct itertools::structs::RepeatCall">RepeatCall</a><F></span></div><div class="content hidden"><h3 class="important">Important traits for <a class="struct" href="../itertools/structs/struct.RepeatCall.html" title="struct itertools::structs::RepeatCall">RepeatCall</a><F></h3><code class="content"><span class="where fmt-newline">impl<A, F> <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.RepeatCall.html" title="struct itertools::structs::RepeatCall">RepeatCall</a><F> <span class="where fmt-newline">where<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, </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 repeat_call<F, A>(function: F) -> <a class="struct" href="../itertools/structs/struct.RepeatCall.html" title="struct itertools::structs::RepeatCall">RepeatCall</a><F> <span class="where fmt-newline">where<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, </span></pre><div class='docblock'><p>An iterator source that produces elements indefinitely by calling
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a given closure.</p>
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<p>Iterator element type is the return type of the closure.</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">repeat_call</span>;
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<span class="kw">use</span> <span class="ident">itertools</span>::<span class="ident">Itertools</span>;
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<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">collections</span>::<span class="ident">BinaryHeap</span>;
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<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">heap</span> <span class="op">=</span> <span class="ident">BinaryHeap</span>::<span class="ident">from</span>(<span class="macro">vec</span><span class="macro">!</span>[<span class="number">2</span>, <span class="number">5</span>, <span class="number">3</span>, <span class="number">7</span>, <span class="number">8</span>]);
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<span class="comment">// extract each element in sorted order</span>
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<span class="kw">for</span> <span class="ident">element</span> <span class="kw">in</span> <span class="ident">repeat_call</span>(<span class="op">||</span> <span class="ident">heap</span>.<span class="ident">pop</span>()).<span class="ident">while_some</span>() {
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<span class="macro">print</span><span class="macro">!</span>(<span class="string">"{}"</span>, <span class="ident">element</span>);
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}
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<span class="ident">itertools</span>::<span class="ident">assert_equal</span>(
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<span class="ident">repeat_call</span>(<span class="op">||</span> <span class="number">1</span>).<span class="ident">take</span>(<span class="number">5</span>),
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<span class="macro">vec</span><span class="macro">!</span>[<span class="number">1</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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);</pre>
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