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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="An iterator that allows peeking at an element before deciding to accept it."><title>PeekingNext in itertools - Rust</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/SourceSerif4-Regular-46f98efaafac5295.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/FiraSans-Regular-018c141bf0843ffd.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/FiraSans-Medium-8f9a781e4970d388.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/SourceCodePro-Regular-562dcc5011b6de7d.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/SourceCodePro-Semibold-d899c5a5c4aeb14a.ttf.woff2"><link rel="stylesheet" href="../static.files/normalize-76eba96aa4d2e634.css"><link rel="stylesheet" href="../static.files/rustdoc-ac92e1bbe349e143.css"><meta name="rustdoc-vars" data-root-path="../" data-static-root-path="../static.files/" data-current-crate="itertools" data-themes="" data-resource-suffix="" data-rustdoc-version="1.76.0 (07dca489a 2024-02-04)" data-channel="1.76.0" data-search-js="search-2b6ce74ff89ae146.js" data-settings-js="settings-4313503d2e1961c2.js" ><script src="../static.files/storage-f2adc0d6ca4d09fb.js"></script><script defer src="sidebar-items.js"></script><script defer src="../static.files/main-305769736d49e732.js"></script><noscript><link rel="stylesheet" href="../static.files/noscript-feafe1bb7466e4bd.css"></noscript><link rel="alternate icon" type="image/png" href="../static.files/favicon-16x16-8b506e7a72182f1c.png"><link rel="alternate icon" type="image/png" href="../static.files/favicon-32x32-422f7d1d52889060.png"><link rel="icon" type="image/svg+xml" href="../static.files/favicon-2c020d218678b618.svg"></head><body class="rustdoc trait"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle">☰</button></nav><nav class="sidebar"><div class="sidebar-crate"><h2><a href="../itertools/index.html">itertools</a><span class="version">0.12.1</span></h2></div><h2 class="location"><a href="#">PeekingNext</a></h2><div class="sidebar-elems"><section><h3><a href="#required-methods">Required Methods</a></h3><ul class="block"><li><a href="#tymethod.peeking_next">peeking_next</a></li></ul><h3><a href="#foreign-impls">Implementations on Foreign Types</a></h3><ul class="block"><li><a href="#impl-PeekingNext-for-%26mut+I">&'a mut I</a></li><li><a href="#impl-PeekingNext-for-Bytes%3C'a%3E">Bytes<'a></a></li><li><a href="#impl-PeekingNext-for-CharIndices%3C'a%3E">CharIndices<'a></a></li><li><a href="#impl-PeekingNext-for-Chars%3C'a%3E">Chars<'a></a></li><li><a href="#impl-PeekingNext-for-Empty%3CT%3E">Empty<T></a></li><li><a href="#impl-PeekingNext-for-Iter%3C'a,+T%3E">Iter<'a, T></a></li><li><a href="#impl-PeekingNext-for-Iter%3C'a,+T%3E">Iter<'a, T></a></li><li><a href="#impl-PeekingNext-for-Iter%3C'a,+T%3E">Iter<'a, T></a></li><li><a href="#impl-PeekingNext-for-Iter%3C'a,+T%3E">Iter<'a, T></a></li><li><a href="#impl-PeekingNext-for-Iter%3C'a,+T%3E">Iter<'a, T></a></li><li><a href="#impl-PeekingNext-for-Peekable%3CI%3E">Peekable<I></a></li><li><a href="#impl-PeekingNext-for-Rev%3CI%3E">Rev<I></a></li></ul><h3><a href="#implementors">Implementors</a></h3></section><h2><a href="index.html">In crate itertools</a></h2></div></nav><div class="sidebar-resizer"></div>
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<main><div class="width-limiter"><nav class="sub"><form class="search-form"><span></span><div id="sidebar-button" tabindex="-1"><a href="../itertools/all.html" title="show sidebar"></a></div><input class="search-input" name="search" aria-label="Run search in the documentation" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" tabindex="-1"><a href="../help.html" title="help">?</a></div><div id="settings-menu" tabindex="-1"><a href="../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../static.files/wheel-7b819b6101059cd0.svg"></a></div></form></nav><section id="main-content" class="content"><div class="main-heading"><h1>Trait <a href="index.html">itertools</a>::<wbr><a class="trait" href="#">PeekingNext</a><button id="copy-path" title="Copy item path to clipboard"><img src="../static.files/clipboard-7571035ce49a181d.svg" width="19" height="18" alt="Copy item path"></button></h1><span class="out-of-band"><a class="src" href="../src/itertools/peeking_take_while.rs.html#15-23">source</a> · <button id="toggle-all-docs" title="collapse all docs">[<span>−</span>]</button></span></div><pre class="rust item-decl"><code>pub trait PeekingNext: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/iter/traits/iterator/trait.Iterator.html" title="trait core::iter::traits::iterator::Iterator">Iterator</a> {
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// Required method
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fn <a href="#tymethod.peeking_next" class="fn">peeking_next</a><F>(&mut self, accept: F) -> <a class="enum" href="https://doc.rust-lang.org/1.76.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="associatedtype" href="https://doc.rust-lang.org/1.76.0/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item" title="type core::iter::traits::iterator::Iterator::Item">Item</a>>
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<span class="where">where Self: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,
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F: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(&Self::<a class="associatedtype" href="https://doc.rust-lang.org/1.76.0/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item" title="type core::iter::traits::iterator::Iterator::Item">Item</a>) -> <a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.bool.html">bool</a></span>;
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}</code></pre><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>An iterator that allows peeking at an element before deciding to accept it.</p>
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<p>See <a href="trait.Itertools.html#method.peeking_take_while" title="method itertools::Itertools::peeking_take_while"><code>.peeking_take_while()</code></a>
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for more information.</p>
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<p>This is implemented by peeking adaptors like peekable and put back,
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but also by a few iterators that can be peeked natively, like the slice’s
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by reference iterator (<code>std::slice::Iter</code>).</p>
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</div></details><h2 id="required-methods" class="section-header">Required Methods<a href="#required-methods" class="anchor">§</a></h2><div class="methods"><details class="toggle method-toggle" open><summary><section id="tymethod.peeking_next" class="method"><a class="src rightside" href="../src/itertools/peeking_take_while.rs.html#19-22">source</a><h4 class="code-header">fn <a href="#tymethod.peeking_next" class="fn">peeking_next</a><F>(&mut self, accept: F) -> <a class="enum" href="https://doc.rust-lang.org/1.76.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="associatedtype" href="https://doc.rust-lang.org/1.76.0/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item" title="type core::iter::traits::iterator::Iterator::Item">Item</a>><div class="where">where
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Self: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,
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F: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(&Self::<a class="associatedtype" href="https://doc.rust-lang.org/1.76.0/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item" title="type core::iter::traits::iterator::Iterator::Item">Item</a>) -> <a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.bool.html">bool</a>,</div></h4></section></summary><div class="docblock"><p>Pass a reference to the next iterator element to the closure <code>accept</code>;
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if <code>accept</code> returns true, return it as the next element,
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else None.</p>
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</div></details></div><h2 id="foreign-impls" class="section-header">Implementations on Foreign Types<a href="#foreign-impls" class="anchor">§</a></h2><details class="toggle implementors-toggle"><summary><section id="impl-PeekingNext-for-Bytes%3C'a%3E" class="impl"><a class="src rightside" href="../src/itertools/peeking_take_while.rs.html#190">source</a><a href="#impl-PeekingNext-for-Bytes%3C'a%3E" class="anchor">§</a><h3 class="code-header">impl<'a> <a class="trait" href="trait.PeekingNext.html" title="trait itertools::PeekingNext">PeekingNext</a> for <a class="struct" href="https://doc.rust-lang.org/1.76.0/core/str/iter/struct.Bytes.html" title="struct core::str::iter::Bytes">Bytes</a><'a></h3></section></summary><div class="impl-items"><section id="method.peeking_next" class="method trait-impl"><a class="src rightside" href="../src/itertools/peeking_take_while.rs.html#190">source</a><a href="#method.peeking_next" class="anchor">§</a><h4 class="code-header">fn <a href="#tymethod.peeking_next" class="fn">peeking_next</a><F>(&mut self, accept: F) -> <a class="enum" href="https://doc.rust-lang.org/1.76.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="associatedtype" href="https://doc.rust-lang.org/1.76.0/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item" title="type core::iter::traits::iterator::Iterator::Item">Item</a>><div class="where">where
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F: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(&Self::<a class="associatedtype" href="https://doc.rust-lang.org/1.76.0/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item" title="type core::iter::traits::iterator::Iterator::Item">Item</a>) -> <a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.bool.html">bool</a>,</div></h4></section></div></details><details class="toggle implementors-toggle"><summary><section id="impl-PeekingNext-for-CharIndices%3C'a%3E" class="impl"><a class="src rightside" href="../src/itertools/peeking_take_while.rs.html#189">source</a><a href="#impl-PeekingNext-for-CharIndices%3C'a%3E" class="anchor">§</a><h3 class="code-header">impl<'a> <a class="trait" href="trait.PeekingNext.html" title="trait itertools::PeekingNext">PeekingNext</a> for <a class="struct" href="https://doc.rust-lang.org/1.76.0/core/str/iter/struct.CharIndices.html" title="struct core::str::iter::CharIndices">CharIndices</a><'a></h3></section></summary><div class="impl-items"><section id="method.peeking_next-1" class="method trait-impl"><a class="src rightside" href="../src/itertools/peeking_take_while.rs.html#189">source</a><a href="#method.peeking_next-1" class="anchor">§</a><h4 class="code-header">fn <a href="#tymethod.peeking_next" class="fn">peeking_next</a><F>(&mut self, accept: F) -> <a class="enum" href="https://doc.rust-lang.org/1.76.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="associatedtype" href="https://doc.rust-lang.org/1.76.0/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item" title="type core::iter::traits::iterator::Iterator::Item">Item</a>><div class="where">where
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F: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(&Self::<a class="associatedtype" href="https://doc.rust-lang.org/1.76.0/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item" title="type core::iter::traits::iterator::Iterator::Item">Item</a>) -> <a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.bool.html">bool</a>,</div></h4></section></div></details><details class="toggle implementors-toggle"><summary><section id="impl-PeekingNext-for-Chars%3C'a%3E" class="impl"><a class="src rightside" href="../src/itertools/peeking_take_while.rs.html#188">source</a><a href="#impl-PeekingNext-for-Chars%3C'a%3E" class="anchor">§</a><h3 class="code-header">impl<'a> <a class="trait" href="trait.PeekingNext.html" title="trait itertools::PeekingNext">PeekingNext</a> for <a class="struct" href="https://doc.rust-lang.org/1.76.0/core/str/iter/struct.Chars.html" title="struct core::str::iter::Chars">Chars</a><'a></h3></section></summary><div class="impl-items"><section id="method.peeking_next-2" class="method trait-impl"><a class="src rightside" href="../src/itertools/peeking_take_while.rs.html#188">source</a><a href="#method.peeking_next-2" class="anchor">§</a><h4 class="code-header">fn <a href="#tymethod.peeking_next" class="fn">peeking_next</a><F>(&mut self, accept: F) -> <a class="enum" href="https://doc.rust-lang.org/1.76.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="associatedtype" href="https://doc.rust-lang.org/1.76.0/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item" title="type core::iter::traits::iterator::Iterator::Item">Item</a>><div class="where">where
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F: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(&Self::<a class="associatedtype" href="https://doc.rust-lang.org/1.76.0/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item" title="type core::iter::traits::iterator::Iterator::Item">Item</a>) -> <a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.bool.html">bool</a>,</div></h4></section></div></details><details class="toggle implementors-toggle"><summary><section id="impl-PeekingNext-for-%26mut+I" class="impl"><a class="src rightside" href="../src/itertools/peeking_take_while.rs.html#25-35">source</a><a href="#impl-PeekingNext-for-%26mut+I" class="anchor">§</a><h3 class="code-header">impl<'a, I> <a class="trait" href="trait.PeekingNext.html" title="trait itertools::PeekingNext">PeekingNext</a> for <a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.reference.html">&'a mut I</a><div class="where">where
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I: <a class="trait" href="trait.PeekingNext.html" title="trait itertools::PeekingNext">PeekingNext</a>,</div></h3></section></summary><div class="impl-items"><section id="method.peeking_next-3" class="method trait-impl"><a class="src rightside" href="../src/itertools/peeking_take_while.rs.html#29-34">source</a><a href="#method.peeking_next-3" class="anchor">§</a><h4 class="code-header">fn <a href="#tymethod.peeking_next" class="fn">peeking_next</a><F>(&mut self, accept: F) -> <a class="enum" href="https://doc.rust-lang.org/1.76.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="associatedtype" href="https://doc.rust-lang.org/1.76.0/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item" title="type core::iter::traits::iterator::Iterator::Item">Item</a>><div class="where">where
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F: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(&Self::<a class="associatedtype" href="https://doc.rust-lang.org/1.76.0/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item" title="type core::iter::traits::iterator::Iterator::Item">Item</a>) -> <a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.bool.html">bool</a>,</div></h4></section></div></details><details class="toggle implementors-toggle"><summary><section id="impl-PeekingNext-for-Iter%3C'a,+T%3E" class="impl"><a class="src rightside" href="../src/itertools/peeking_take_while.rs.html#195">source</a><a href="#impl-PeekingNext-for-Iter%3C'a,+T%3E" class="anchor">§</a><h3 class="code-header">impl<'a, T> <a class="trait" href="trait.PeekingNext.html" title="trait itertools::PeekingNext">PeekingNext</a> for <a class="struct" href="https://doc.rust-lang.org/1.76.0/alloc/collections/linked_list/struct.Iter.html" title="struct alloc::collections::linked_list::Iter">Iter</a><'a, T></h3></section></summary><div class="impl-items"><section id="method.peeking_next-4" class="method trait-impl"><a class="src rightside" href="../src/itertools/peeking_take_while.rs.html#195">source</a><a href="#method.peeking_next-4" class="anchor">§</a><h4 class="code-header">fn <a href="#tymethod.peeking_next" class="fn">peeking_next</a><F>(&mut self, accept: F) -> <a class="enum" href="https://doc.rust-lang.org/1.76.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="associatedtype" href="https://doc.rust-lang.org/1.76.0/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item" title="type core::iter::traits::iterator::Iterator::Item">Item</a>><div class="where">where
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F: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(&Self::<a class="associatedtype" href="https://doc.rust-lang.org/1.76.0/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item" title="type core::iter::traits::iterator::Iterator::Item">Item</a>) -> <a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.bool.html">bool</a>,</div></h4></section></div></details><details class="toggle implementors-toggle"><summary><section id="impl-PeekingNext-for-Iter%3C'a,+T%3E-1" class="impl"><a class="src rightside" href="../src/itertools/peeking_take_while.rs.html#197">source</a><a href="#impl-PeekingNext-for-Iter%3C'a,+T%3E-1" class="anchor">§</a><h3 class="code-header">impl<'a, T> <a class="trait" href="trait.PeekingNext.html" title="trait itertools::PeekingNext">PeekingNext</a> for <a class="struct" href="https://doc.rust-lang.org/1.76.0/alloc/collections/vec_deque/iter/struct.Iter.html" title="struct alloc::collections::vec_deque::iter::Iter">Iter</a><'a, T></h3></section></summary><div class="impl-items"><section id="method.peeking_next-5" class="method trait-impl"><a class="src rightside" href="../src/itertools/peeking_take_while.rs.html#197">source</a><a href="#method.peeking_next-5" class="anchor">§</a><h4 class="code-header">fn <a href="#tymethod.peeking_next" class="fn">peeking_next</a><F>(&mut self, accept: F) -> <a class="enum" href="https://doc.rust-lang.org/1.76.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="associatedtype" href="https://doc.rust-lang.org/1.76.0/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item" title="type core::iter::traits::iterator::Iterator::Item">Item</a>><div class="where">where
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F: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(&Self::<a class="associatedtype" href="https://doc.rust-lang.org/1.76.0/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item" title="type core::iter::traits::iterator::Iterator::Item">Item</a>) -> <a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.bool.html">bool</a>,</div></h4></section></div></details><details class="toggle implementors-toggle"><summary><section id="impl-PeekingNext-for-Iter%3C'a,+T%3E-2" class="impl"><a class="src rightside" href="../src/itertools/peeking_take_while.rs.html#191">source</a><a href="#impl-PeekingNext-for-Iter%3C'a,+T%3E-2" class="anchor">§</a><h3 class="code-header">impl<'a, T> <a class="trait" href="trait.PeekingNext.html" title="trait itertools::PeekingNext">PeekingNext</a> for <a class="struct" href="https://doc.rust-lang.org/1.76.0/core/option/struct.Iter.html" title="struct core::option::Iter">Iter</a><'a, T></h3></section></summary><div class="impl-items"><section id="method.peeking_next-6" class="method trait-impl"><a class="src rightside" href="../src/itertools/peeking_take_while.rs.html#191">source</a><a href="#method.peeking_next-6" class="anchor">§</a><h4 class="code-header">fn <a href="#tymethod.peeking_next" class="fn">peeking_next</a><F>(&mut self, accept: F) -> <a class="enum" href="https://doc.rust-lang.org/1.76.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="associatedtype" href="https://doc.rust-lang.org/1.76.0/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item" title="type core::iter::traits::iterator::Iterator::Item">Item</a>><div class="where">where
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F: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(&Self::<a class="associatedtype" href="https://doc.rust-lang.org/1.76.0/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item" title="type core::iter::traits::iterator::Iterator::Item">Item</a>) -> <a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.bool.html">bool</a>,</div></h4></section></div></details><details class="toggle implementors-toggle"><summary><section id="impl-PeekingNext-for-Iter%3C'a,+T%3E-3" class="impl"><a class="src rightside" href="../src/itertools/peeking_take_while.rs.html#192">source</a><a href="#impl-PeekingNext-for-Iter%3C'a,+T%3E-3" class="anchor">§</a><h3 class="code-header">impl<'a, T> <a class="trait" href="trait.PeekingNext.html" title="trait itertools::PeekingNext">PeekingNext</a> for <a class="struct" href="https://doc.rust-lang.org/1.76.0/core/result/struct.Iter.html" title="struct core::result::Iter">Iter</a><'a, T></h3></section></summary><div class="impl-items"><section id="method.peeking_next-7" class="method trait-impl"><a class="src rightside" href="../src/itertools/peeking_take_while.rs.html#192">source</a><a href="#method.peeking_next-7" class="anchor">§</a><h4 class="code-header">fn <a href="#tymethod.peeking_next" class="fn">peeking_next</a><F>(&mut self, accept: F) -> <a class="enum" href="https://doc.rust-lang.org/1.76.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="associatedtype" href="https://doc.rust-lang.org/1.76.0/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item" title="type core::iter::traits::iterator::Iterator::Item">Item</a>><div class="where">where
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F: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(&Self::<a class="associatedtype" href="https://doc.rust-lang.org/1.76.0/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item" title="type core::iter::traits::iterator::Iterator::Item">Item</a>) -> <a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.bool.html">bool</a>,</div></h4></section></div></details><details class="toggle implementors-toggle"><summary><section id="impl-PeekingNext-for-Iter%3C'a,+T%3E-4" class="impl"><a class="src rightside" href="../src/itertools/peeking_take_while.rs.html#187">source</a><a href="#impl-PeekingNext-for-Iter%3C'a,+T%3E-4" class="anchor">§</a><h3 class="code-header">impl<'a, T> <a class="trait" href="trait.PeekingNext.html" title="trait itertools::PeekingNext">PeekingNext</a> for <a class="struct" href="https://doc.rust-lang.org/1.76.0/core/slice/iter/struct.Iter.html" title="struct core::slice::iter::Iter">Iter</a><'a, T></h3></section></summary><div class="impl-items"><section id="method.peeking_next-8" class="method trait-impl"><a class="src rightside" href="../src/itertools/peeking_take_while.rs.html#187">source</a><a href="#method.peeking_next-8" class="anchor">§</a><h4 class="code-header">fn <a href="#tymethod.peeking_next" class="fn">peeking_next</a><F>(&mut self, accept: F) -> <a class="enum" href="https://doc.rust-lang.org/1.76.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="associatedtype" href="https://doc.rust-lang.org/1.76.0/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item" title="type core::iter::traits::iterator::Iterator::Item">Item</a>><div class="where">where
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F: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(&Self::<a class="associatedtype" href="https://doc.rust-lang.org/1.76.0/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item" title="type core::iter::traits::iterator::Iterator::Item">Item</a>) -> <a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.bool.html">bool</a>,</div></h4></section></div></details><details class="toggle implementors-toggle"><summary><section id="impl-PeekingNext-for-Peekable%3CI%3E" class="impl"><a class="src rightside" href="../src/itertools/peeking_take_while.rs.html#37-52">source</a><a href="#impl-PeekingNext-for-Peekable%3CI%3E" class="anchor">§</a><h3 class="code-header">impl<I> <a class="trait" href="trait.PeekingNext.html" title="trait itertools::PeekingNext">PeekingNext</a> for <a class="struct" href="https://doc.rust-lang.org/1.76.0/core/iter/adapters/peekable/struct.Peekable.html" title="struct core::iter::adapters::peekable::Peekable">Peekable</a><I><div class="where">where
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I: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/iter/traits/iterator/trait.Iterator.html" title="trait core::iter::traits::iterator::Iterator">Iterator</a>,</div></h3></section></summary><div class="impl-items"><section id="method.peeking_next-9" class="method trait-impl"><a class="src rightside" href="../src/itertools/peeking_take_while.rs.html#41-51">source</a><a href="#method.peeking_next-9" class="anchor">§</a><h4 class="code-header">fn <a href="#tymethod.peeking_next" class="fn">peeking_next</a><F>(&mut self, accept: F) -> <a class="enum" href="https://doc.rust-lang.org/1.76.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="associatedtype" href="https://doc.rust-lang.org/1.76.0/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item" title="type core::iter::traits::iterator::Iterator::Item">Item</a>><div class="where">where
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F: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(&Self::<a class="associatedtype" href="https://doc.rust-lang.org/1.76.0/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item" title="type core::iter::traits::iterator::Iterator::Item">Item</a>) -> <a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.bool.html">bool</a>,</div></h4></section></div></details><details class="toggle implementors-toggle"><summary><section id="impl-PeekingNext-for-Rev%3CI%3E" class="impl"><a class="src rightside" href="../src/itertools/peeking_take_while.rs.html#200-201">source</a><a href="#impl-PeekingNext-for-Rev%3CI%3E" class="anchor">§</a><h3 class="code-header">impl<I: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a> + <a class="trait" href="trait.PeekingNext.html" title="trait itertools::PeekingNext">PeekingNext</a> + <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/iter/traits/double_ended/trait.DoubleEndedIterator.html" title="trait core::iter::traits::double_ended::DoubleEndedIterator">DoubleEndedIterator</a>> <a class="trait" href="trait.PeekingNext.html" title="trait itertools::PeekingNext">PeekingNext</a> for <a class="struct" href="https://doc.rust-lang.org/1.76.0/core/iter/adapters/rev/struct.Rev.html" title="struct core::iter::adapters::rev::Rev">Rev</a><I></h3></section></summary><div class="impl-items"><section id="method.peeking_next-10" class="method trait-impl"><a class="src rightside" href="../src/itertools/peeking_take_while.rs.html#200-201">source</a><a href="#method.peeking_next-10" class="anchor">§</a><h4 class="code-header">fn <a href="#tymethod.peeking_next" class="fn">peeking_next</a><F>(&mut self, accept: F) -> <a class="enum" href="https://doc.rust-lang.org/1.76.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="associatedtype" href="https://doc.rust-lang.org/1.76.0/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item" title="type core::iter::traits::iterator::Iterator::Item">Item</a>><div class="where">where
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F: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(&Self::<a class="associatedtype" href="https://doc.rust-lang.org/1.76.0/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item" title="type core::iter::traits::iterator::Iterator::Item">Item</a>) -> <a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.bool.html">bool</a>,</div></h4></section></div></details><details class="toggle implementors-toggle"><summary><section id="impl-PeekingNext-for-Empty%3CT%3E" class="impl"><a class="src rightside" href="../src/itertools/peeking_take_while.rs.html#193">source</a><a href="#impl-PeekingNext-for-Empty%3CT%3E" class="anchor">§</a><h3 class="code-header">impl<T> <a class="trait" href="trait.PeekingNext.html" title="trait itertools::PeekingNext">PeekingNext</a> for <a class="struct" href="https://doc.rust-lang.org/1.76.0/core/iter/sources/empty/struct.Empty.html" title="struct core::iter::sources::empty::Empty">Empty</a><T></h3></section></summary><div class="impl-items"><section id="method.peeking_next-11" class="method trait-impl"><a class="src rightside" href="../src/itertools/peeking_take_while.rs.html#193">source</a><a href="#method.peeking_next-11" class="anchor">§</a><h4 class="code-header">fn <a href="#tymethod.peeking_next" class="fn">peeking_next</a><F>(&mut self, accept: F) -> <a class="enum" href="https://doc.rust-lang.org/1.76.0/core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="associatedtype" href="https://doc.rust-lang.org/1.76.0/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item" title="type core::iter::traits::iterator::Iterator::Item">Item</a>><div class="where">where
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F: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(&Self::<a class="associatedtype" href="https://doc.rust-lang.org/1.76.0/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item" title="type core::iter::traits::iterator::Iterator::Item">Item</a>) -> <a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.bool.html">bool</a>,</div></h4></section></div></details><h2 id="implementors" class="section-header">Implementors<a href="#implementors" class="anchor">§</a></h2><div id="implementors-list"><section id="impl-PeekingNext-for-PeekingTakeWhile%3C'a,+I,+F%3E" class="impl"><a class="src rightside" href="../src/itertools/peeking_take_while.rs.html#151-163">source</a><a href="#impl-PeekingNext-for-PeekingTakeWhile%3C'a,+I,+F%3E" class="anchor">§</a><h3 class="code-header">impl<'a, I, F> <a class="trait" href="trait.PeekingNext.html" title="trait itertools::PeekingNext">PeekingNext</a> for <a class="struct" href="structs/struct.PeekingTakeWhile.html" title="struct itertools::structs::PeekingTakeWhile">PeekingTakeWhile</a><'a, I, F><div class="where">where
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I: <a class="trait" href="trait.PeekingNext.html" title="trait itertools::PeekingNext">PeekingNext</a>,
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F: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/ops/function/trait.FnMut.html" title="trait core::ops::function::FnMut">FnMut</a>(&I::<a class="associatedtype" href="https://doc.rust-lang.org/1.76.0/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item" title="type core::iter::traits::iterator::Iterator::Item">Item</a>) -> <a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.bool.html">bool</a>,</div></h3></section><section id="impl-PeekingNext-for-MultiPeek%3CI%3E" class="impl"><a class="src rightside" href="../src/itertools/multipeek_impl.rs.html#68-89">source</a><a href="#impl-PeekingNext-for-MultiPeek%3CI%3E" class="anchor">§</a><h3 class="code-header">impl<I> <a class="trait" href="trait.PeekingNext.html" title="trait itertools::PeekingNext">PeekingNext</a> for <a class="struct" href="structs/struct.MultiPeek.html" title="struct itertools::structs::MultiPeek">MultiPeek</a><I><div class="where">where
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I: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/iter/traits/iterator/trait.Iterator.html" title="trait core::iter::traits::iterator::Iterator">Iterator</a>,</div></h3></section><section id="impl-PeekingNext-for-PeekNth%3CI%3E" class="impl"><a class="src rightside" href="../src/itertools/peek_nth.rs.html#167-178">source</a><a href="#impl-PeekingNext-for-PeekNth%3CI%3E" class="anchor">§</a><h3 class="code-header">impl<I> <a class="trait" href="trait.PeekingNext.html" title="trait itertools::PeekingNext">PeekingNext</a> for <a class="struct" href="structs/struct.PeekNth.html" title="struct itertools::structs::PeekNth">PeekNth</a><I><div class="where">where
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I: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/iter/traits/iterator/trait.Iterator.html" title="trait core::iter::traits::iterator::Iterator">Iterator</a>,</div></h3></section><section id="impl-PeekingNext-for-PutBack%3CI%3E" class="impl"><a class="src rightside" href="../src/itertools/peeking_take_while.rs.html#54-72">source</a><a href="#impl-PeekingNext-for-PutBack%3CI%3E" class="anchor">§</a><h3 class="code-header">impl<I> <a class="trait" href="trait.PeekingNext.html" title="trait itertools::PeekingNext">PeekingNext</a> for <a class="struct" href="structs/struct.PutBack.html" title="struct itertools::structs::PutBack">PutBack</a><I><div class="where">where
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I: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/iter/traits/iterator/trait.Iterator.html" title="trait core::iter::traits::iterator::Iterator">Iterator</a>,</div></h3></section><section id="impl-PeekingNext-for-PutBackN%3CI%3E" class="impl"><a class="src rightside" href="../src/itertools/peeking_take_while.rs.html#75-93">source</a><a href="#impl-PeekingNext-for-PutBackN%3CI%3E" class="anchor">§</a><h3 class="code-header">impl<I> <a class="trait" href="trait.PeekingNext.html" title="trait itertools::PeekingNext">PeekingNext</a> for <a class="struct" href="structs/struct.PutBackN.html" title="struct itertools::structs::PutBackN">PutBackN</a><I><div class="where">where
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I: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/iter/traits/iterator/trait.Iterator.html" title="trait core::iter::traits::iterator::Iterator">Iterator</a>,</div></h3></section><section id="impl-PeekingNext-for-RepeatN%3CT%3E" class="impl"><a class="src rightside" href="../src/itertools/peeking_take_while.rs.html#95-106">source</a><a href="#impl-PeekingNext-for-RepeatN%3CT%3E" class="anchor">§</a><h3 class="code-header">impl<T: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a>> <a class="trait" href="trait.PeekingNext.html" title="trait itertools::PeekingNext">PeekingNext</a> for <a class="struct" href="structs/struct.RepeatN.html" title="struct itertools::structs::RepeatN">RepeatN</a><T></h3></section></div><script src="../trait.impl/itertools/peeking_take_while/trait.PeekingNext.js" data-ignore-extern-crates="alloc,core" async></script></section></div></main></body></html>
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