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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 `SeqAccess` trait in crate `serde`."><meta name="keywords" content="rust, rustlang, rust-lang, SeqAccess"><title>serde::de::SeqAccess - 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='../../serde/index.html'><div class='logo-container rust-logo'><img src='../../rust-logo.png' alt='logo'></div></a><p class="location">Trait SeqAccess</p><div class="sidebar-elems"><div class="block items"><a class="sidebar-title" href="#associated-types">Associated Types</a><div class="sidebar-links"><a href="#associatedtype.Error">Error</a></div><a class="sidebar-title" href="#required-methods">Required Methods</a><div class="sidebar-links"><a href="#tymethod.next_element_seed">next_element_seed</a></div><a class="sidebar-title" href="#provided-methods">Provided Methods</a><div class="sidebar-links"><a href="#method.next_element">next_element</a><a href="#method.size_hint">size_hint</a></div><a class="sidebar-title" href="#foreign-impls">Implementations on Foreign Types</a><div class="sidebar-links"><a href="#impl-SeqAccess%3C%27de%3E-for-%26%27a%20mut%20A">&'a mut A</a></div><a class="sidebar-title" href="#implementors">Implementors</a></div><p class="location"><a href="../index.html">serde</a>::<wbr><a href="index.html">de</a></p><div id="sidebar-vars" data-name="SeqAccess" 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">serde</a>::<wbr><a href="index.html">de</a>::<wbr><a class="trait" href="">SeqAccess</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/serde/de/mod.rs.html#1683-1715" title="goto source code">[src]</a></span></h1><div class="docblock type-decl hidden-by-usual-hider"><pre class="rust trait">pub trait SeqAccess<'de> {
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type <a href="#associatedtype.Error" class="type">Error</a>: <a class="trait" href="../../serde/de/trait.Error.html" title="trait serde::de::Error">Error</a>;
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fn <a href="#tymethod.next_element_seed" class="fnname">next_element_seed</a><T>(<br> &mut self, <br> seed: T<br> ) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><T::<a class="type" href="../../serde/de/trait.DeserializeSeed.html#associatedtype.Value" title="type serde::de::DeserializeSeed::Value">Value</a>>, Self::<a class="type" href="../../serde/de/trait.SeqAccess.html#associatedtype.Error" title="type serde::de::SeqAccess::Error">Error</a>><br> <span class="where">where<br> T: <a class="trait" href="../../serde/de/trait.DeserializeSeed.html" title="trait serde::de::DeserializeSeed">DeserializeSeed</a><'de></span>;
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fn <a href="#method.next_element" class="fnname">next_element</a><T>(&mut self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><T>, Self::<a class="type" href="../../serde/de/trait.SeqAccess.html#associatedtype.Error" title="type serde::de::SeqAccess::Error">Error</a>><br> <span class="where">where<br> T: <a class="trait" href="../../serde/trait.Deserialize.html" title="trait serde::Deserialize">Deserialize</a><'de></span>,
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{ ... }
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<div class="item-spacer"></div> fn <a href="#method.size_hint" class="fnname">size_hint</a>(&self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>> { ... }
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}</pre></div><div class="docblock"><p>Provides a <code>Visitor</code> access to each element of a sequence in the input.</p>
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<p>This is a trait that a <code>Deserializer</code> passes to a <code>Visitor</code> implementation,
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which deserializes each item in a sequence.</p>
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<h1 id="lifetime" class="section-header"><a href="#lifetime">Lifetime</a></h1>
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<p>The <code>'de</code> lifetime of this trait is the lifetime of data that may be
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borrowed by deserialized sequence elements. See the page <a href="https://serde.rs/lifetimes.html">Understanding
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deserializer lifetimes</a> for a more detailed explanation of these lifetimes.</p>
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<h1 id="example-implementation" class="section-header"><a href="#example-implementation">Example implementation</a></h1>
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<p>The <a href="https://serde.rs/data-format.html">example data format</a> presented on the website demonstrates an
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implementation of <code>SeqAccess</code> for a basic JSON data format.</p>
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</div><h2 id="associated-types" class="small-section-header">Associated Types<a href="#associated-types" class="anchor"></a></h2><div class="methods"><h3 id="associatedtype.Error" class="method"><code>type <a href="#associatedtype.Error" class="type">Error</a>: <a class="trait" href="../../serde/de/trait.Error.html" title="trait serde::de::Error">Error</a></code><a class="srclink" href="../../src/serde/de/mod.rs.html#1686" title="goto source code">[src]</a></h3><div class="docblock"><p>The error type that can be returned if some error occurs during
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deserialization.</p>
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</div></div><span class="loading-content">Loading content...</span><h2 id="required-methods" class="small-section-header">Required methods<a href="#required-methods" class="anchor"></a></h2><div class="methods"><h3 id="tymethod.next_element_seed" class="method"><code>fn <a href="#tymethod.next_element_seed" class="fnname">next_element_seed</a><T>(<br> &mut self, <br> seed: T<br>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><T::<a class="type" href="../../serde/de/trait.DeserializeSeed.html#associatedtype.Value" title="type serde::de::DeserializeSeed::Value">Value</a>>, Self::<a class="type" href="../../serde/de/trait.SeqAccess.html#associatedtype.Error" title="type serde::de::SeqAccess::Error">Error</a>> <span class="where fmt-newline">where<br> T: <a class="trait" href="../../serde/de/trait.DeserializeSeed.html" title="trait serde::de::DeserializeSeed">DeserializeSeed</a><'de>, </span></code><a class="srclink" href="../../src/serde/de/mod.rs.html#1693-1695" title="goto source code">[src]</a></h3><div class="docblock"><p>This returns <code>Ok(Some(value))</code> for the next value in the sequence, or
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<code>Ok(None)</code> if there are no more remaining items.</p>
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<p><code>Deserialize</code> implementations should typically use
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<code>SeqAccess::next_element</code> instead.</p>
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</div></div><span class="loading-content">Loading content...</span><h2 id="provided-methods" class="small-section-header">Provided methods<a href="#provided-methods" class="anchor"></a></h2><div class="methods"><h3 id="method.next_element" class="method"><code>fn <a href="#method.next_element" class="fnname">next_element</a><T>(&mut self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><T>, Self::<a class="type" href="../../serde/de/trait.SeqAccess.html#associatedtype.Error" title="type serde::de::SeqAccess::Error">Error</a>> <span class="where fmt-newline">where<br> T: <a class="trait" href="../../serde/trait.Deserialize.html" title="trait serde::Deserialize">Deserialize</a><'de>, </span></code><a class="srclink" href="../../src/serde/de/mod.rs.html#1703-1708" title="goto source code">[src]</a></h3><div class="docblock"><p>This returns <code>Ok(Some(value))</code> for the next value in the sequence, or
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<code>Ok(None)</code> if there are no more remaining items.</p>
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<p>This method exists as a convenience for <code>Deserialize</code> implementations.
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<code>SeqAccess</code> implementations should not override the default behavior.</p>
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</div><h3 id="method.size_hint" class="method"><code>fn <a href="#method.size_hint" class="fnname">size_hint</a>(&self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>></code><a class="srclink" href="../../src/serde/de/mod.rs.html#1712-1714" title="goto source code">[src]</a></h3><div class="docblock"><p>Returns the number of elements remaining in the sequence, if known.</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-SeqAccess%3C%27de%3E-for-%26%27a%20mut%20A" class="impl"><code class="in-band">impl<'de, 'a, A> <a class="trait" href="../../serde/de/trait.SeqAccess.html" title="trait serde::de::SeqAccess">SeqAccess</a><'de> for <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&'a mut </a>A <span class="where fmt-newline">where<br> A: <a class="trait" href="../../serde/de/trait.SeqAccess.html" title="trait serde::de::SeqAccess">SeqAccess</a><'de>, </span></code><a href="#impl-SeqAccess%3C%27de%3E-for-%26%27a%20mut%20A" class="anchor"></a><a class="srclink" href="../../src/serde/de/mod.rs.html#1717-1743" title="goto source code">[src]</a></h3><div class="impl-items"><h4 id="associatedtype.Error-1" class="type"><code>type <a href="#associatedtype.Error" class="type">Error</a> = A::<a class="type" href="../../serde/de/trait.SeqAccess.html#associatedtype.Error" title="type serde::de::SeqAccess::Error">Error</a></code></h4><h4 id="method.next_element_seed" class="method hidden"><code>fn <a href="#method.next_element_seed" class="fnname">next_element_seed</a><T>(<br> &mut self, <br> seed: T<br>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><T::<a class="type" href="../../serde/de/trait.DeserializeSeed.html#associatedtype.Value" title="type serde::de::DeserializeSeed::Value">Value</a>>, Self::<a class="type" href="../../serde/de/trait.SeqAccess.html#associatedtype.Error" title="type serde::de::SeqAccess::Error">Error</a>> <span class="where fmt-newline">where<br> T: <a class="trait" href="../../serde/de/trait.DeserializeSeed.html" title="trait serde::de::DeserializeSeed">DeserializeSeed</a><'de>, </span></code><a class="srclink" href="../../src/serde/de/mod.rs.html#1724-1729" title="goto source code">[src]</a></h4><h4 id="method.next_element-1" class="method hidden"><code>fn <a href="#method.next_element" class="fnname">next_element</a><T>(&mut self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><T>, Self::<a class="type" href="../../serde/de/trait.SeqAccess.html#associatedtype.Error" title="type serde::de::SeqAccess::Error">Error</a>> <span class="where fmt-newline">where<br> T: <a class="trait" href="../../serde/trait.Deserialize.html" title="trait serde::Deserialize">Deserialize</a><'de>, </span></code><a class="srclink" href="../../src/serde/de/mod.rs.html#1732-1737" title="goto source code">[src]</a></h4><h4 id="method.size_hint-1" class="method hidden"><code>fn <a href="#method.size_hint" class="fnname">size_hint</a>(&self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>></code><a class="srclink" href="../../src/serde/de/mod.rs.html#1740-1742" 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-SeqAccess%3C%27de%3E" class="impl"><code class="in-band">impl<'de, I, E> SeqAccess<'de> for <a class="struct" href="../../serde/de/value/struct.MapDeserializer.html" title="struct serde::de::value::MapDeserializer">MapDeserializer</a><'de, I, E> <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>,<br> I::<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>: Pair,<br> <I::<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> as Pair>::First: <a class="trait" href="../../serde/de/trait.IntoDeserializer.html" title="trait serde::de::IntoDeserializer">IntoDeserializer</a><'de, E>,<br> <I::<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> as Pair>::Second: <a class="trait" href="../../serde/de/trait.IntoDeserializer.html" title="trait serde::de::IntoDeserializer">IntoDeserializer</a><'de, E>,<br> E: <a class="trait" href="../../serde/de/trait.Error.html" title="trait serde::de::Error">Error</a>, </span></code><a href="#impl-SeqAccess%3C%27de%3E" class="anchor"></a><a class="srclink" href="../../src/serde/de/value.rs.html#1208-1234" title="goto source code">[src]</a></h3><div class="impl-items"><h4 id="associatedtype.Error-2" class="type"><code>type <a href="#associatedtype.Error-2" class="type">Error</a> = E</code></h4><h4 id="method.next_element_seed-1" class="method hidden"><code>fn <a href="#method.next_element_seed-1" class="fnname">next_element_seed</a><T>(<br> &mut self, <br> seed: T<br>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><T::<a class="type" href="../../serde/de/trait.DeserializeSeed.html#associatedtype.Value" title="type serde::de::DeserializeSeed::Value">Value</a>>, Self::<a class="type" href="../../serde/de/trait.SeqAccess.html#associatedtype.Error" title="type serde::de::SeqAccess::Error">Error</a>> <span class="where fmt-newline">where<br> T: <a class="trait" href="../../serde/de/trait.DeserializeSeed.html" title="trait serde::de::DeserializeSeed">DeserializeSeed</a><'de>, </span></code><a class="srclink" href="../../src/serde/de/value.rs.html#1218-1229" title="goto source code">[src]</a></h4><h4 id="method.size_hint-2" class="method hidden"><code>fn <a href="#method.size_hint-2" class="fnname">size_hint</a>(&self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>></code><a class="srclink" href="../../src/serde/de/value.rs.html#1231-1233" title="goto source code">[src]</a></h4></div><h3 id="impl-SeqAccess%3C%27de%3E-1" class="impl"><code class="in-band">impl<'de, I, T, E> SeqAccess<'de> for <a class="struct" href="../../serde/de/value/struct.SeqDeserializer.html" title="struct serde::de::value::SeqDeserializer">SeqDeserializer</a><I, E> <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><Item = T>,<br> T: <a class="trait" href="../../serde/de/trait.IntoDeserializer.html" title="trait serde::de::IntoDeserializer">IntoDeserializer</a><'de, E>,<br> E: <a class="trait" href="../../serde/de/trait.Error.html" title="trait serde::de::Error">Error</a>, </span></code><a href="#impl-SeqAccess%3C%27de%3E-1" class="anchor"></a><a class="srclink" href="../../src/serde/de/value.rs.html#908-932" title="goto source code">[src]</a></h3><div class="impl-items"><h4 id="associatedtype.Error-3" class="type"><code>type <a href="#associatedtype.Error-3" class="type">Error</a> = E</code></h4><h4 id="method.next_element_seed-2" class="method hidden"><code>fn <a href="#method.next_element_seed-2" class="fnname">next_element_seed</a><V>(<br> &mut self, <br> seed: V<br>) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a><<a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><V::<a class="type" href="../../serde/de/trait.DeserializeSeed.html#associatedtype.Value" title="type serde::de::DeserializeSeed::Value">Value</a>>, Self::<a class="type" href="../../serde/de/trait.SeqAccess.html#associatedtype.Error" title="type serde::de::SeqAccess::Error">Error</a>> <span class="where fmt-newline">where<br> V: <a class="trait" href="../../serde/de/trait.DeserializeSeed.html" title="trait serde::de::DeserializeSeed">DeserializeSeed</a><'de>, </span></code><a class="srclink" href="../../src/serde/de/value.rs.html#916-927" title="goto source code">[src]</a></h4><h4 id="method.size_hint-3" class="method hidden"><code>fn <a href="#method.size_hint-3" class="fnname">size_hint</a>(&self) -> <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a><<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>></code><a class="srclink" href="../../src/serde/de/value.rs.html#929-931" title="goto source code">[src]</a></h4></div></div><span class="loading-content">Loading content...</span><script type="text/javascript" src="../../implementors/serde/de/trait.SeqAccess.js" async></script></section><section 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