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<p class='location'>Trait MapAccess</p><div class="block items"><ul><li><a href="#associated-types">Associated Types</a></li><li><a href="#required-methods">Required Methods</a></li><li><a href="#provided-methods">Provided Methods</a></li><li><a href="#implementors">Implementors</a></li></ul></div><p class='location'><a href='../index.html'>serde</a>::<wbr><a href='index.html'>de</a></p><script>window.sidebarCurrent = {name: 'MapAccess', ty: 'trait', relpath: ''};</script><script defer src="sidebar-items.js"></script>
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<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=''>MapAccess</a></span><span class='out-of-band'><span id='render-detail'>
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<pre class='rust trait'>pub trait MapAccess&lt;'de&gt; {
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>;
fn <a href='#tymethod.next_key_seed' class='fnname'>next_key_seed</a>&lt;K&gt;(<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&amp;mut self, <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;seed: K<br>&nbsp;&nbsp;&nbsp;&nbsp;) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;<a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;K::<a class="type" href="../../serde/de/trait.DeserializeSeed.html#associatedtype.Value" title="type serde::de::DeserializeSeed::Value">Value</a>&gt;, Self::<a class="type" href="../../serde/de/trait.MapAccess.html#associatedtype.Error" title="type serde::de::MapAccess::Error">Error</a>&gt;<br>&nbsp;&nbsp;&nbsp; <span class="where">where<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;K: <a class="trait" href="../../serde/de/trait.DeserializeSeed.html" title="trait serde::de::DeserializeSeed">DeserializeSeed</a>&lt;'de&gt;</span>;
fn <a href='#tymethod.next_value_seed' class='fnname'>next_value_seed</a>&lt;V&gt;(&amp;mut self, seed: V) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;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.MapAccess.html#associatedtype.Error" title="type serde::de::MapAccess::Error">Error</a>&gt;<br>&nbsp;&nbsp;&nbsp; <span class="where">where<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;V: <a class="trait" href="../../serde/de/trait.DeserializeSeed.html" title="trait serde::de::DeserializeSeed">DeserializeSeed</a>&lt;'de&gt;</span>;
fn <a href='#method.next_entry_seed' class='fnname'>next_entry_seed</a>&lt;K, V&gt;(<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&amp;mut self, <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;kseed: K, <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;vseed: V<br>&nbsp;&nbsp;&nbsp;&nbsp;) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;<a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.tuple.html">(</a>K::<a class="type" href="../../serde/de/trait.DeserializeSeed.html#associatedtype.Value" title="type serde::de::DeserializeSeed::Value">Value</a>, V::<a class="type" href="../../serde/de/trait.DeserializeSeed.html#associatedtype.Value" title="type serde::de::DeserializeSeed::Value">Value</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.tuple.html">)</a>&gt;, Self::<a class="type" href="../../serde/de/trait.MapAccess.html#associatedtype.Error" title="type serde::de::MapAccess::Error">Error</a>&gt;<br>&nbsp;&nbsp;&nbsp; <span class="where">where<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;K: <a class="trait" href="../../serde/de/trait.DeserializeSeed.html" title="trait serde::de::DeserializeSeed">DeserializeSeed</a>&lt;'de&gt;,<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;V: <a class="trait" href="../../serde/de/trait.DeserializeSeed.html" title="trait serde::de::DeserializeSeed">DeserializeSeed</a>&lt;'de&gt;</span>,
{ ... }
fn <a href='#method.next_key' class='fnname'>next_key</a>&lt;K&gt;(&amp;mut self) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;<a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;K&gt;, Self::<a class="type" href="../../serde/de/trait.MapAccess.html#associatedtype.Error" title="type serde::de::MapAccess::Error">Error</a>&gt;<br>&nbsp;&nbsp;&nbsp; <span class="where">where<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;K: <a class="trait" href="../../serde/trait.Deserialize.html" title="trait serde::Deserialize">Deserialize</a>&lt;'de&gt;</span>,
{ ... }
fn <a href='#method.next_value' class='fnname'>next_value</a>&lt;V&gt;(&amp;mut self) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;V, Self::<a class="type" href="../../serde/de/trait.MapAccess.html#associatedtype.Error" title="type serde::de::MapAccess::Error">Error</a>&gt;<br>&nbsp;&nbsp;&nbsp; <span class="where">where<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;V: <a class="trait" href="../../serde/trait.Deserialize.html" title="trait serde::Deserialize">Deserialize</a>&lt;'de&gt;</span>,
{ ... }
fn <a href='#method.next_entry' class='fnname'>next_entry</a>&lt;K, V&gt;(&amp;mut self) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;<a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.tuple.html">(</a>K, V<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.tuple.html">)</a>&gt;, Self::<a class="type" href="../../serde/de/trait.MapAccess.html#associatedtype.Error" title="type serde::de::MapAccess::Error">Error</a>&gt;<br>&nbsp;&nbsp;&nbsp; <span class="where">where<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;K: <a class="trait" href="../../serde/trait.Deserialize.html" title="trait serde::Deserialize">Deserialize</a>&lt;'de&gt;,<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;V: <a class="trait" href="../../serde/trait.Deserialize.html" title="trait serde::Deserialize">Deserialize</a>&lt;'de&gt;</span>,
{ ... }
fn <a href='#method.size_hint' class='fnname'>size_hint</a>(&amp;self) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>&gt; { ... }
}</pre><div class='docblock'><p>Provides a <code>Visitor</code> access to each entry of a map in the input.</p>
<p>This is a trait that a <code>Deserializer</code> passes to a <code>Visitor</code> implementation.</p>
</div>
<h2 id='associated-types'>Associated Types</h2>
<div class='methods'>
<h3 id='associatedtype.Error' class='method'><span id='Error.t' class='invisible'><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></span></h3><div class='docblock'><p>The error type that can be returned if some error occurs during
deserialization.</p>
</div></div>
<h2 id='required-methods'>Required Methods</h2>
<div class='methods'>
<h3 id='tymethod.next_key_seed' class='method'><span id='next_key_seed.v' class='invisible'><code>fn <a href='#tymethod.next_key_seed' class='fnname'>next_key_seed</a>&lt;K&gt;(&amp;mut self, seed: K) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;<a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;K::<a class="type" href="../../serde/de/trait.DeserializeSeed.html#associatedtype.Value" title="type serde::de::DeserializeSeed::Value">Value</a>&gt;, Self::<a class="type" href="../../serde/de/trait.MapAccess.html#associatedtype.Error" title="type serde::de::MapAccess::Error">Error</a>&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;K: <a class="trait" href="../../serde/de/trait.DeserializeSeed.html" title="trait serde::de::DeserializeSeed">DeserializeSeed</a>&lt;'de&gt;,&nbsp;</span></code></span></h3><div class='docblock'><p>This returns <code>Ok(Some(key))</code> for the next key in the map, or <code>Ok(None)</code>
if there are no more remaining entries.</p>
<p><code>Deserialize</code> implementations should typically use
<code>MapAccess::next_key</code> or <code>MapAccess::next_entry</code> instead.</p>
</div><h3 id='tymethod.next_value_seed' class='method'><span id='next_value_seed.v' class='invisible'><code>fn <a href='#tymethod.next_value_seed' class='fnname'>next_value_seed</a>&lt;V&gt;(&amp;mut self, seed: V) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;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.MapAccess.html#associatedtype.Error" title="type serde::de::MapAccess::Error">Error</a>&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;V: <a class="trait" href="../../serde/de/trait.DeserializeSeed.html" title="trait serde::de::DeserializeSeed">DeserializeSeed</a>&lt;'de&gt;,&nbsp;</span></code></span></h3><div class='docblock'><p>This returns a <code>Ok(value)</code> for the next value in the map.</p>
<p><code>Deserialize</code> implementations should typically use
<code>MapAccess::next_value</code> instead.</p>
<h1 id='panics' class='section-header'><a href='#panics'>Panics</a></h1>
<p>Calling <code>next_value_seed</code> before <code>next_key_seed</code> is incorrect and is
allowed to panic or return bogus results.</p>
</div></div>
<h2 id='provided-methods'>Provided Methods</h2>
<div class='methods'>
<h3 id='method.next_entry_seed' class='method'><span id='next_entry_seed.v' class='invisible'><code>fn <a href='#method.next_entry_seed' class='fnname'>next_entry_seed</a>&lt;K, V&gt;(<br>&nbsp;&nbsp;&nbsp;&nbsp;&amp;mut self, <br>&nbsp;&nbsp;&nbsp;&nbsp;kseed: K, <br>&nbsp;&nbsp;&nbsp;&nbsp;vseed: V<br>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;<a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.tuple.html">(</a>K::<a class="type" href="../../serde/de/trait.DeserializeSeed.html#associatedtype.Value" title="type serde::de::DeserializeSeed::Value">Value</a>, V::<a class="type" href="../../serde/de/trait.DeserializeSeed.html#associatedtype.Value" title="type serde::de::DeserializeSeed::Value">Value</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.tuple.html">)</a>&gt;, Self::<a class="type" href="../../serde/de/trait.MapAccess.html#associatedtype.Error" title="type serde::de::MapAccess::Error">Error</a>&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;K: <a class="trait" href="../../serde/de/trait.DeserializeSeed.html" title="trait serde::de::DeserializeSeed">DeserializeSeed</a>&lt;'de&gt;,<br>&nbsp;&nbsp;&nbsp;&nbsp;V: <a class="trait" href="../../serde/de/trait.DeserializeSeed.html" title="trait serde::de::DeserializeSeed">DeserializeSeed</a>&lt;'de&gt;,&nbsp;</span></code></span></h3><div class='docblock'><p>This returns <code>Ok(Some((key, value)))</code> for the next (key-value) pair in
the map, or <code>Ok(None)</code> if there are no more remaining items.</p>
<p><code>MapAccess</code> implementations should override the default behavior if a
more efficient implementation is possible.</p>
<p><code>Deserialize</code> implementations should typically use
<code>MapAccess::next_entry</code> instead.</p>
</div><h3 id='method.next_key' class='method'><span id='next_key.v' class='invisible'><code>fn <a href='#method.next_key' class='fnname'>next_key</a>&lt;K&gt;(&amp;mut self) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;<a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;K&gt;, Self::<a class="type" href="../../serde/de/trait.MapAccess.html#associatedtype.Error" title="type serde::de::MapAccess::Error">Error</a>&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;K: <a class="trait" href="../../serde/trait.Deserialize.html" title="trait serde::Deserialize">Deserialize</a>&lt;'de&gt;,&nbsp;</span></code></span></h3><div class='docblock'><p>This returns <code>Ok(Some(key))</code> for the next key in the map, or <code>Ok(None)</code>
if there are no more remaining entries.</p>
<p>This method exists as a convenience for <code>Deserialize</code> implementations.
<code>MapAccess</code> implementations should not override the default behavior.</p>
</div><h3 id='method.next_value' class='method'><span id='next_value.v' class='invisible'><code>fn <a href='#method.next_value' class='fnname'>next_value</a>&lt;V&gt;(&amp;mut self) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;V, Self::<a class="type" href="../../serde/de/trait.MapAccess.html#associatedtype.Error" title="type serde::de::MapAccess::Error">Error</a>&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;V: <a class="trait" href="../../serde/trait.Deserialize.html" title="trait serde::Deserialize">Deserialize</a>&lt;'de&gt;,&nbsp;</span></code></span></h3><div class='docblock'><p>This returns a <code>Ok(value)</code> for the next value in the map.</p>
<p>This method exists as a convenience for <code>Deserialize</code> implementations.
<code>MapAccess</code> implementations should not override the default behavior.</p>
<h1 id='panics-1' class='section-header'><a href='#panics-1'>Panics</a></h1>
<p>Calling <code>next_value</code> before <code>next_key</code> is incorrect and is allowed to
panic or return bogus results.</p>
</div><h3 id='method.next_entry' class='method'><span id='next_entry.v' class='invisible'><code>fn <a href='#method.next_entry' class='fnname'>next_entry</a>&lt;K, V&gt;(&amp;mut self) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;<a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.tuple.html">(</a>K, V<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.tuple.html">)</a>&gt;, Self::<a class="type" href="../../serde/de/trait.MapAccess.html#associatedtype.Error" title="type serde::de::MapAccess::Error">Error</a>&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;K: <a class="trait" href="../../serde/trait.Deserialize.html" title="trait serde::Deserialize">Deserialize</a>&lt;'de&gt;,<br>&nbsp;&nbsp;&nbsp;&nbsp;V: <a class="trait" href="../../serde/trait.Deserialize.html" title="trait serde::Deserialize">Deserialize</a>&lt;'de&gt;,&nbsp;</span></code></span></h3><div class='docblock'><p>This returns <code>Ok(Some((key, value)))</code> for the next (key-value) pair in
the map, or <code>Ok(None)</code> if there are no more remaining items.</p>
<p>This method exists as a convenience for <code>Deserialize</code> implementations.
<code>MapAccess</code> implementations should not override the default behavior.</p>
</div><h3 id='method.size_hint' class='method'><span id='size_hint.v' class='invisible'><code>fn <a href='#method.size_hint' class='fnname'>size_hint</a>(&amp;self) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/option/enum.Option.html" title="enum core::option::Option">Option</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>&gt;</code></span></h3><div class='docblock'><p>Returns the number of entries remaining in the map, if known.</p>
</div></div>
<h2 id='implementors'>Implementors</h2>
<ul class='item-list' id='implementors-list'>
<li><code>impl&lt;'de, I, E&gt; MapAccess&lt;'de&gt; for <a class="struct" href="../../serde/de/value/struct.MapDeserializer.html" title="struct serde::de::value::MapDeserializer">MapDeserializer</a>&lt;'de, I, E&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;I: <a class="trait" href="https://doc.rust-lang.org/nightly/core/iter/iterator/trait.Iterator.html" title="trait core::iter::iterator::Iterator">Iterator</a>,<br>&nbsp;&nbsp;&nbsp;&nbsp;I::<a class="type" href="https://doc.rust-lang.org/nightly/core/iter/iterator/trait.Iterator.html#associatedtype.Item" title="type core::iter::iterator::Iterator::Item">Item</a>: Pair,<br>&nbsp;&nbsp;&nbsp;&nbsp;&lt;I::<a class="type" href="https://doc.rust-lang.org/nightly/core/iter/iterator/trait.Iterator.html#associatedtype.Item" title="type core::iter::iterator::Iterator::Item">Item</a> as Pair&gt;::First: <a class="trait" href="../../serde/de/trait.IntoDeserializer.html" title="trait serde::de::IntoDeserializer">IntoDeserializer</a>&lt;'de, E&gt;,<br>&nbsp;&nbsp;&nbsp;&nbsp;&lt;I::<a class="type" href="https://doc.rust-lang.org/nightly/core/iter/iterator/trait.Iterator.html#associatedtype.Item" title="type core::iter::iterator::Iterator::Item">Item</a> as Pair&gt;::Second: <a class="trait" href="../../serde/de/trait.IntoDeserializer.html" title="trait serde::de::IntoDeserializer">IntoDeserializer</a>&lt;'de, E&gt;,<br>&nbsp;&nbsp;&nbsp;&nbsp;E: <a class="trait" href="../../serde/de/trait.Error.html" title="trait serde::de::Error">Error</a>,&nbsp;</span></code></li>
<li><code>impl&lt;'de, 'a, A&gt; MapAccess&lt;'de&gt; for &amp;'a mut A <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;A: <a class="trait" href="../../serde/de/trait.MapAccess.html" title="trait serde::de::MapAccess">MapAccess</a>&lt;'de&gt;,&nbsp;</span></code></li>
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