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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="API documentation for the Rust `PeekingNext` trait in crate `itertools`."><meta name="keywords" content="rust, rustlang, rust-lang, PeekingNext"><title>itertools::PeekingNext - Rust</title><link rel="stylesheet" type="text/css" href="../normalize.css"><link rel="stylesheet" type="text/css" href="../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../light.css" id="themeStyle"><link rel="stylesheet" type="text/css" href="../dark.css" disabled ><link rel="stylesheet" type="text/css" href="../ayu.css" disabled ><script id="default-settings"></script><script src="../storage.js"></script><noscript><link rel="stylesheet" href="../noscript.css"></noscript><link rel="icon" type="image/svg+xml" href="../favicon.svg">
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<link rel="alternate icon" type="image/png" href="../favicon-32x32.png"><style type="text/css">#crate-search{background-image:url("../down-arrow.svg");}</style></head><body class="rustdoc trait"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu">☰</div><a href='../itertools/index.html'><div class='logo-container rust-logo'><img src='../rust-logo.png' alt='logo'></div></a><p class="location">Trait PeekingNext</p><div class="sidebar-elems"><div class="block items"><a class="sidebar-title" href="#required-methods">Required Methods</a><div class="sidebar-links"><a href="#tymethod.peeking_next">peeking_next</a></div><a class="sidebar-title" href="#foreign-impls">Implementations on Foreign Types</a><div class="sidebar-links"><a href="#impl-PeekingNext-for-Bytes%3C%27a%3E">Bytes<'a></a><a href="#impl-PeekingNext-for-CharIndices%3C%27a%3E">CharIndices<'a></a><a href="#impl-PeekingNext-for-Chars%3C%27a%3E">Chars<'a></a><a href="#impl-PeekingNext-for-Empty%3CT%3E">Empty<T></a><a href="#impl-PeekingNext-for-Iter%3C%27a%2C%20T%3E">Iter<'a, T></a><a href="#impl-PeekingNext-for-Iter%3C%27a%2C%20T%3E">Iter<'a, T></a><a href="#impl-PeekingNext-for-Iter%3C%27a%2C%20T%3E">Iter<'a, T></a><a href="#impl-PeekingNext-for-Iter%3C%27a%2C%20T%3E">Iter<'a, T></a><a href="#impl-PeekingNext-for-Iter%3C%27a%2C%20T%3E">Iter<'a, T></a><a href="#impl-PeekingNext-for-Peekable%3CI%3E">Peekable<I></a><a href="#impl-PeekingNext-for-Rev%3CI%3E">Rev<I></a></div><a class="sidebar-title" href="#implementors">Implementors</a></div><p class="location"><a href="index.html">itertools</a></p><div id="sidebar-vars" data-name="PeekingNext" data-ty="trait" data-relpath=""></div><script defer src="sidebar-items.js"></script></div></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!" aria-haspopup="menu"><img src="../brush.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices" role="menu"></div></div><script src="../theme.js"></script><nav class="sub"><form class="search-form"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" disabled autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><button type="button" class="help-button">?</button>
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<a id="settings-menu" href="../settings.html"><img src="../wheel.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><h1 class="fqn"><span class="in-band">Trait <a href="index.html">itertools</a>::<wbr><a class="trait" href="">PeekingNext</a></span><span class="out-of-band"><span id="render-detail"><a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">−</span>]</a></span><a class="srclink" href="../src/itertools/peeking_take_while.rs.html#14-20" title="goto source code">[src]</a></span></h1><div class="docblock type-decl hidden-by-usual-hider"><pre class="rust trait">pub trait PeekingNext: <a class="trait" href="https://doc.rust-lang.org/nightly/core/iter/traits/iterator/trait.Iterator.html" title="trait core::iter::traits::iterator::Iterator">Iterator</a> {
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fn <a href="#tymethod.peeking_next" class="fnname">peeking_next</a><F>(&mut self, accept: F) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="https://doc.rust-lang.org/nightly/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item" title="type core::iter::traits::iterator::Iterator::Item">Item</a>><br> <span class="where">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(&Self::<a class="type" href="https://doc.rust-lang.org/nightly/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/nightly/std/primitive.bool.html">bool</a></span>;
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}</pre></div><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"><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><h2 id="required-methods" class="small-section-header">Required methods<a href="#required-methods" class="anchor"></a></h2><div class="methods"><h3 id="tymethod.peeking_next" class="method"><code>fn <a href="#tymethod.peeking_next" class="fnname">peeking_next</a><F>(&mut self, accept: F) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="https://doc.rust-lang.org/nightly/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item" title="type core::iter::traits::iterator::Iterator::Item">Item</a>> <span class="where fmt-newline">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(&Self::<a class="type" href="https://doc.rust-lang.org/nightly/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/nightly/std/primitive.bool.html">bool</a>, </span></code><a class="srclink" href="../src/itertools/peeking_take_while.rs.html#18-19" title="goto source code">[src]</a></h3><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></div><span class="loading-content">Loading content...</span><h2 id="foreign-impls" class="small-section-header">Implementations on Foreign Types<a href="#foreign-impls" class="anchor"></a></h2><h3 id="impl-PeekingNext-for-Peekable%3CI%3E" class="impl"><code class="in-band">impl<I> <a class="trait" href="../itertools/trait.PeekingNext.html" title="trait itertools::PeekingNext">PeekingNext</a> for <a class="struct" href="https://doc.rust-lang.org/nightly/core/iter/adapters/peekable/struct.Peekable.html" title="struct core::iter::adapters::peekable::Peekable">Peekable</a><I> <span class="where fmt-newline">where<br> I: <a class="trait" href="https://doc.rust-lang.org/nightly/core/iter/traits/iterator/trait.Iterator.html" title="trait core::iter::traits::iterator::Iterator">Iterator</a>, </span></code><a href="#impl-PeekingNext-for-Peekable%3CI%3E" class="anchor"></a><a class="srclink" href="../src/itertools/peeking_take_while.rs.html#22-35" title="goto source code">[src]</a></h3><div class="impl-items"><h4 id="method.peeking_next" class="method hidden"><code>fn <a href="#method.peeking_next" class="fnname">peeking_next</a><F>(&mut self, accept: F) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="https://doc.rust-lang.org/nightly/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item" title="type core::iter::traits::iterator::Iterator::Item">Item</a>> <span class="where fmt-newline">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(&Self::<a class="type" href="https://doc.rust-lang.org/nightly/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/nightly/std/primitive.bool.html">bool</a>, </span></code><a class="srclink" href="../src/itertools/peeking_take_while.rs.html#25-34" title="goto source code">[src]</a></h4></div><h3 id="impl-PeekingNext-for-Iter%3C%27a%2C%20T%3E" class="impl"><code class="in-band">impl<'a, T> <a class="trait" href="../itertools/trait.PeekingNext.html" title="trait itertools::PeekingNext">PeekingNext</a> for <a class="struct" href="https://doc.rust-lang.org/nightly/core/slice/iter/struct.Iter.html" title="struct core::slice::iter::Iter">Iter</a><'a, T></code><a href="#impl-PeekingNext-for-Iter%3C%27a%2C%20T%3E" class="anchor"></a><a class="srclink" href="../src/itertools/peeking_take_while.rs.html#133" title="goto source code">[src]</a></h3><div class="impl-items"><h4 id="method.peeking_next-1" class="method hidden"><code>fn <a href="#method.peeking_next" class="fnname">peeking_next</a><F>(&mut self, accept: F) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="https://doc.rust-lang.org/nightly/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item" title="type core::iter::traits::iterator::Iterator::Item">Item</a>> <span class="where fmt-newline">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(&Self::<a class="type" href="https://doc.rust-lang.org/nightly/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/nightly/std/primitive.bool.html">bool</a>, </span></code><a class="srclink" href="../src/itertools/peeking_take_while.rs.html#133" title="goto source code">[src]</a></h4></div><h3 id="impl-PeekingNext-for-Chars%3C%27a%3E" class="impl"><code class="in-band">impl<'a> <a class="trait" href="../itertools/trait.PeekingNext.html" title="trait itertools::PeekingNext">PeekingNext</a> for <a class="struct" href="https://doc.rust-lang.org/nightly/core/str/iter/struct.Chars.html" title="struct core::str::iter::Chars">Chars</a><'a></code><a href="#impl-PeekingNext-for-Chars%3C%27a%3E" class="anchor"></a><a class="srclink" href="../src/itertools/peeking_take_while.rs.html#134" title="goto source code">[src]</a></h3><div class="impl-items"><h4 id="method.peeking_next-2" class="method hidden"><code>fn <a href="#method.peeking_next" class="fnname">peeking_next</a><F>(&mut self, accept: F) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="https://doc.rust-lang.org/nightly/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item" title="type core::iter::traits::iterator::Iterator::Item">Item</a>> <span class="where fmt-newline">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(&Self::<a class="type" href="https://doc.rust-lang.org/nightly/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/nightly/std/primitive.bool.html">bool</a>, </span></code><a class="srclink" href="../src/itertools/peeking_take_while.rs.html#134" title="goto source code">[src]</a></h4></div><h3 id="impl-PeekingNext-for-CharIndices%3C%27a%3E" class="impl"><code class="in-band">impl<'a> <a class="trait" href="../itertools/trait.PeekingNext.html" title="trait itertools::PeekingNext">PeekingNext</a> for <a class="struct" href="https://doc.rust-lang.org/nightly/core/str/iter/struct.CharIndices.html" title="struct core::str::iter::CharIndices">CharIndices</a><'a></code><a href="#impl-PeekingNext-for-CharIndices%3C%27a%3E" class="anchor"></a><a class="srclink" href="../src/itertools/peeking_take_while.rs.html#135" title="goto source code">[src]</a></h3><div class="impl-items"><h4 id="method.peeking_next-3" class="method hidden"><code>fn <a href="#method.peeking_next" class="fnname">peeking_next</a><F>(&mut self, accept: F) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="https://doc.rust-lang.org/nightly/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item" title="type core::iter::traits::iterator::Iterator::Item">Item</a>> <span class="where fmt-newline">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(&Self::<a class="type" href="https://doc.rust-lang.org/nightly/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/nightly/std/primitive.bool.html">bool</a>, </span></code><a class="srclink" href="../src/itertools/peeking_take_while.rs.html#135" title="goto source code">[src]</a></h4></div><h3 id="impl-PeekingNext-for-Bytes%3C%27a%3E" class="impl"><code class="in-band">impl<'a> <a class="trait" href="../itertools/trait.PeekingNext.html" title="trait itertools::PeekingNext">PeekingNext</a> for <a class="struct" href="https://doc.rust-lang.org/nightly/core/str/iter/struct.Bytes.html" title="struct core::str::iter::Bytes">Bytes</a><'a></code><a href="#impl-PeekingNext-for-Bytes%3C%27a%3E" class="anchor"></a><a class="srclink" href="../src/itertools/peeking_take_while.rs.html#136" title="goto source code">[src]</a></h3><div class="impl-items"><h4 id="method.peeking_next-4" class="method hidden"><code>fn <a href="#method.peeking_next" class="fnname">peeking_next</a><F>(&mut self, accept: F) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="https://doc.rust-lang.org/nightly/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item" title="type core::iter::traits::iterator::Iterator::Item">Item</a>> <span class="where fmt-newline">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(&Self::<a class="type" href="https://doc.rust-lang.org/nightly/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/nightly/std/primitive.bool.html">bool</a>, </span></code><a class="srclink" href="../src/itertools/peeking_take_while.rs.html#136" title="goto source code">[src]</a></h4></div><h3 id="impl-PeekingNext-for-Iter%3C%27a%2C%20T%3E-1" class="impl"><code class="in-band">impl<'a, T> <a class="trait" href="../itertools/trait.PeekingNext.html" title="trait itertools::PeekingNext">PeekingNext</a> for <a class="struct" href="https://doc.rust-lang.org/nightly/core/option/struct.Iter.html" title="struct core::option::Iter">Iter</a><'a, T></code><a href="#impl-PeekingNext-for-Iter%3C%27a%2C%20T%3E-1" class="anchor"></a><a class="srclink" href="../src/itertools/peeking_take_while.rs.html#137" title="goto source code">[src]</a></h3><div class="impl-items"><h4 id="method.peeking_next-5" class="method hidden"><code>fn <a href="#method.peeking_next" class="fnname">peeking_next</a><F>(&mut self, accept: F) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="https://doc.rust-lang.org/nightly/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item" title="type core::iter::traits::iterator::Iterator::Item">Item</a>> <span class="where fmt-newline">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(&Self::<a class="type" href="https://doc.rust-lang.org/nightly/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/nightly/std/primitive.bool.html">bool</a>, </span></code><a class="srclink" href="../src/itertools/peeking_take_while.rs.html#137" title="goto source code">[src]</a></h4></div><h3 id="impl-PeekingNext-for-Iter%3C%27a%2C%20T%3E-2" class="impl"><code class="in-band">impl<'a, T> <a class="trait" href="../itertools/trait.PeekingNext.html" title="trait itertools::PeekingNext">PeekingNext</a> for <a class="struct" href="https://doc.rust-lang.org/nightly/core/result/struct.Iter.html" title="struct core::result::Iter">Iter</a><'a, T></code><a href="#impl-PeekingNext-for-Iter%3C%27a%2C%20T%3E-2" class="anchor"></a><a class="srclink" href="../src/itertools/peeking_take_while.rs.html#138" title="goto source code">[src]</a></h3><div class="impl-items"><h4 id="method.peeking_next-6" class="method hidden"><code>fn <a href="#method.peeking_next" class="fnname">peeking_next</a><F>(&mut self, accept: F) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="https://doc.rust-lang.org/nightly/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item" title="type core::iter::traits::iterator::Iterator::Item">Item</a>> <span class="where fmt-newline">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(&Self::<a class="type" href="https://doc.rust-lang.org/nightly/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/nightly/std/primitive.bool.html">bool</a>, </span></code><a class="srclink" href="../src/itertools/peeking_take_while.rs.html#138" title="goto source code">[src]</a></h4></div><h3 id="impl-PeekingNext-for-Empty%3CT%3E" class="impl"><code class="in-band">impl<T> <a class="trait" href="../itertools/trait.PeekingNext.html" title="trait itertools::PeekingNext">PeekingNext</a> for <a class="struct" href="https://doc.rust-lang.org/nightly/core/iter/sources/empty/struct.Empty.html" title="struct core::iter::sources::empty::Empty">Empty</a><T></code><a href="#impl-PeekingNext-for-Empty%3CT%3E" class="anchor"></a><a class="srclink" href="../src/itertools/peeking_take_while.rs.html#139" title="goto source code">[src]</a></h3><div class="impl-items"><h4 id="method.peeking_next-7" class="method hidden"><code>fn <a href="#method.peeking_next" class="fnname">peeking_next</a><F>(&mut self, accept: F) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="https://doc.rust-lang.org/nightly/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item" title="type core::iter::traits::iterator::Iterator::Item">Item</a>> <span class="where fmt-newline">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(&Self::<a class="type" href="https://doc.rust-lang.org/nightly/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/nightly/std/primitive.bool.html">bool</a>, </span></code><a class="srclink" href="../src/itertools/peeking_take_while.rs.html#139" title="goto source code">[src]</a></h4></div><h3 id="impl-PeekingNext-for-Iter%3C%27a%2C%20T%3E-3" class="impl"><code class="in-band">impl<'a, T> <a class="trait" href="../itertools/trait.PeekingNext.html" title="trait itertools::PeekingNext">PeekingNext</a> for <a class="struct" href="https://doc.rust-lang.org/nightly/alloc/collections/linked_list/struct.Iter.html" title="struct alloc::collections::linked_list::Iter">Iter</a><'a, T></code><a href="#impl-PeekingNext-for-Iter%3C%27a%2C%20T%3E-3" class="anchor"></a><a class="srclink" href="../src/itertools/peeking_take_while.rs.html#141" title="goto source code">[src]</a></h3><div class="impl-items"><h4 id="method.peeking_next-8" class="method hidden"><code>fn <a href="#method.peeking_next" class="fnname">peeking_next</a><F>(&mut self, accept: F) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="https://doc.rust-lang.org/nightly/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item" title="type core::iter::traits::iterator::Iterator::Item">Item</a>> <span class="where fmt-newline">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(&Self::<a class="type" href="https://doc.rust-lang.org/nightly/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/nightly/std/primitive.bool.html">bool</a>, </span></code><a class="srclink" href="../src/itertools/peeking_take_while.rs.html#141" title="goto source code">[src]</a></h4></div><h3 id="impl-PeekingNext-for-Iter%3C%27a%2C%20T%3E-4" class="impl"><code class="in-band">impl<'a, T> <a class="trait" href="../itertools/trait.PeekingNext.html" title="trait itertools::PeekingNext">PeekingNext</a> for <a class="struct" href="https://doc.rust-lang.org/nightly/alloc/collections/vec_deque/iter/struct.Iter.html" title="struct alloc::collections::vec_deque::iter::Iter">Iter</a><'a, T></code><a href="#impl-PeekingNext-for-Iter%3C%27a%2C%20T%3E-4" class="anchor"></a><a class="srclink" href="../src/itertools/peeking_take_while.rs.html#143" title="goto source code">[src]</a></h3><div class="impl-items"><h4 id="method.peeking_next-9" class="method hidden"><code>fn <a href="#method.peeking_next" class="fnname">peeking_next</a><F>(&mut self, accept: F) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="https://doc.rust-lang.org/nightly/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item" title="type core::iter::traits::iterator::Iterator::Item">Item</a>> <span class="where fmt-newline">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(&Self::<a class="type" href="https://doc.rust-lang.org/nightly/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/nightly/std/primitive.bool.html">bool</a>, </span></code><a class="srclink" href="../src/itertools/peeking_take_while.rs.html#143" title="goto source code">[src]</a></h4></div><h3 id="impl-PeekingNext-for-Rev%3CI%3E" class="impl"><code class="in-band">impl<I: <a class="trait" href="https://doc.rust-lang.org/nightly/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a> + <a class="trait" href="../itertools/trait.PeekingNext.html" title="trait itertools::PeekingNext">PeekingNext</a> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/iter/traits/double_ended/trait.DoubleEndedIterator.html" title="trait core::iter::traits::double_ended::DoubleEndedIterator">DoubleEndedIterator</a>> <a class="trait" href="../itertools/trait.PeekingNext.html" title="trait itertools::PeekingNext">PeekingNext</a> for <a class="struct" href="https://doc.rust-lang.org/nightly/core/iter/adapters/rev/struct.Rev.html" title="struct core::iter::adapters::rev::Rev">Rev</a><I></code><a href="#impl-PeekingNext-for-Rev%3CI%3E" class="anchor"></a><a class="srclink" href="../src/itertools/peeking_take_while.rs.html#146-147" title="goto source code">[src]</a></h3><div class="impl-items"><h4 id="method.peeking_next-10" class="method hidden"><code>fn <a href="#method.peeking_next" class="fnname">peeking_next</a><F>(&mut self, accept: F) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="https://doc.rust-lang.org/nightly/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item" title="type core::iter::traits::iterator::Iterator::Item">Item</a>> <span class="where fmt-newline">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(&Self::<a class="type" href="https://doc.rust-lang.org/nightly/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/nightly/std/primitive.bool.html">bool</a>, </span></code><a class="srclink" href="../src/itertools/peeking_take_while.rs.html#146-147" title="goto source code">[src]</a></h4></div><span class="loading-content">Loading content...</span><h2 id="implementors" class="small-section-header">Implementors<a href="#implementors" class="anchor"></a></h2><div class="item-list" id="implementors-list"><h3 id="impl-PeekingNext" class="impl"><code class="in-band">impl<I> PeekingNext for <a class="struct" href="../itertools/structs/struct.MultiPeek.html" title="struct itertools::structs::MultiPeek">MultiPeek</a><I> <span class="where fmt-newline">where<br> I: <a class="trait" href="https://doc.rust-lang.org/nightly/core/iter/traits/iterator/trait.Iterator.html" title="trait core::iter::traits::iterator::Iterator">Iterator</a>, </span></code><a href="#impl-PeekingNext" class="anchor"></a><a class="srclink" href="../src/itertools/multipeek_impl.rs.html#59-76" title="goto source code">[src]</a></h3><div class="impl-items"><h4 id="method.peeking_next-11" class="method hidden"><code>fn <a href="#method.peeking_next-11" class="fnname">peeking_next</a><F>(&mut self, accept: F) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="https://doc.rust-lang.org/nightly/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item" title="type core::iter::traits::iterator::Iterator::Item">Item</a>> <span class="where fmt-newline">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(&Self::<a class="type" href="https://doc.rust-lang.org/nightly/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/nightly/std/primitive.bool.html">bool</a>, </span></code><a class="srclink" href="../src/itertools/multipeek_impl.rs.html#62-75" title="goto source code">[src]</a></h4></div><h3 id="impl-PeekingNext-1" class="impl"><code class="in-band">impl<I> PeekingNext for <a class="struct" href="../itertools/structs/struct.PeekNth.html" title="struct itertools::structs::PeekNth">PeekNth</a><I> <span class="where fmt-newline">where<br> I: <a class="trait" href="https://doc.rust-lang.org/nightly/core/iter/traits/iterator/trait.Iterator.html" title="trait core::iter::traits::iterator::Iterator">Iterator</a>, </span></code><a href="#impl-PeekingNext-1" class="anchor"></a><a class="srclink" href="../src/itertools/peek_nth.rs.html#91-102" title="goto source code">[src]</a></h3><div class="impl-items"><h4 id="method.peeking_next-12" class="method hidden"><code>fn <a href="#method.peeking_next-12" class="fnname">peeking_next</a><F>(&mut self, accept: F) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="https://doc.rust-lang.org/nightly/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item" title="type core::iter::traits::iterator::Iterator::Item">Item</a>> <span class="where fmt-newline">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(&Self::<a class="type" href="https://doc.rust-lang.org/nightly/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/nightly/std/primitive.bool.html">bool</a>, </span></code><a class="srclink" href="../src/itertools/peek_nth.rs.html#95-101" title="goto source code">[src]</a></h4></div><h3 id="impl-PeekingNext-2" class="impl"><code class="in-band">impl<I> PeekingNext for <a class="struct" href="../itertools/structs/struct.PutBack.html" title="struct itertools::structs::PutBack">PutBack</a><I> <span class="where fmt-newline">where<br> I: <a class="trait" href="https://doc.rust-lang.org/nightly/core/iter/traits/iterator/trait.Iterator.html" title="trait core::iter::traits::iterator::Iterator">Iterator</a>, </span></code><a href="#impl-PeekingNext-2" class="anchor"></a><a class="srclink" href="../src/itertools/peeking_take_while.rs.html#37-53" title="goto source code">[src]</a></h3><div class="impl-items"><h4 id="method.peeking_next-13" class="method hidden"><code>fn <a href="#method.peeking_next-13" class="fnname">peeking_next</a><F>(&mut self, accept: F) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="https://doc.rust-lang.org/nightly/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item" title="type core::iter::traits::iterator::Iterator::Item">Item</a>> <span class="where fmt-newline">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(&Self::<a class="type" href="https://doc.rust-lang.org/nightly/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/nightly/std/primitive.bool.html">bool</a>, </span></code><a class="srclink" href="../src/itertools/peeking_take_while.rs.html#40-52" title="goto source code">[src]</a></h4></div><h3 id="impl-PeekingNext-3" class="impl"><code class="in-band">impl<I> PeekingNext for <a class="struct" href="../itertools/structs/struct.PutBackN.html" title="struct itertools::structs::PutBackN">PutBackN</a><I> <span class="where fmt-newline">where<br> I: <a class="trait" href="https://doc.rust-lang.org/nightly/core/iter/traits/iterator/trait.Iterator.html" title="trait core::iter::traits::iterator::Iterator">Iterator</a>, </span></code><a href="#impl-PeekingNext-3" class="anchor"></a><a class="srclink" href="../src/itertools/peeking_take_while.rs.html#56-72" title="goto source code">[src]</a></h3><div class="impl-items"><h4 id="method.peeking_next-14" class="method hidden"><code>fn <a href="#method.peeking_next-14" class="fnname">peeking_next</a><F>(&mut self, accept: F) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><Self::<a class="type" href="https://doc.rust-lang.org/nightly/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item" title="type core::iter::traits::iterator::Iterator::Item">Item</a>> <span class="where fmt-newline">where<br> F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnOnce.html" title="trait core::ops::function::FnOnce">FnOnce</a>(&Self::<a class="type" href="https://doc.rust-lang.org/nightly/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/nightly/std/primitive.bool.html">bool</a>, </span></code><a class="srclink" href="../src/itertools/peeking_take_while.rs.html#59-71" title="goto source code">[src]</a></h4></div></div><span class="loading-content">Loading content...</span><script type="text/javascript" src="../implementors/itertools/trait.PeekingNext.js" async></script></section><section id="search" class="content hidden"></section><section class="footer"></section><div id="rustdoc-vars" data-root-path="../" data-current-crate="itertools"></div>
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