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<p class='location'>Trait EnumAccess</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><a href="#associatedtype.Variant">Variant</a></div><a class="sidebar-title" href="#required-methods">Required Methods</a><div class="sidebar-links"><a href="#tymethod.variant_seed">variant_seed</a></div><a class="sidebar-title" href="#provided-methods">Provided Methods</a><div class="sidebar-links"><a href="#method.variant">variant</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><script>window.sidebarCurrent = {name: 'EnumAccess', ty: 'trait', relpath: ''};</script><script defer src="sidebar-items.js"></script></div>
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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=''>EnumAccess</a></span><span class='out-of-band'><span id='render-detail'>
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</span><a class='srclink' href='../../src/serde/de/mod.rs.html#1950-1977' title='goto source code'>[src]</a></span></h1>
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<pre class='rust trait'>pub trait EnumAccess<'de>: <a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a> {
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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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type <a href='#associatedtype.Variant' class="type">Variant</a>: <a class="trait" href="../../serde/de/trait.VariantAccess.html" title="trait serde::de::VariantAccess">VariantAccess</a><'de, Error = Self::<a class="type" href="../../serde/de/trait.EnumAccess.html#associatedtype.Error" title="type serde::de::EnumAccess::Error">Error</a>>;
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fn <a href='#tymethod.variant_seed' class='fnname'>variant_seed</a><V>(<br> 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="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.tuple.html">(</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.EnumAccess.html#associatedtype.Variant" title="type serde::de::EnumAccess::Variant">Variant</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.tuple.html">)</a>, Self::<a class="type" href="../../serde/de/trait.EnumAccess.html#associatedtype.Error" title="type serde::de::EnumAccess::Error">Error</a>><br> <span class="where">where<br> V: <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.variant' class='fnname'>variant</a><V>(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="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.tuple.html">(</a>V, Self::<a class="type" href="../../serde/de/trait.EnumAccess.html#associatedtype.Variant" title="type serde::de::EnumAccess::Variant">Variant</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.tuple.html">)</a>, Self::<a class="type" href="../../serde/de/trait.EnumAccess.html#associatedtype.Error" title="type serde::de::EnumAccess::Error">Error</a>><br> <span class="where">where<br> V: <a class="trait" href="../../serde/trait.Deserialize.html" title="trait serde::Deserialize">Deserialize</a><'de></span>,
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{ ... }
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}</pre><div class='docblock'><p>Provides a <code>Visitor</code> access to the data of an enum in the input.</p>
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<p><code>EnumAccess</code> is created by the <code>Deserializer</code> and passed to the
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<code>Visitor</code> in order to identify which variant of an enum to deserialize.</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 the deserialized enum variant. 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>EnumAccess</code> for a basic JSON data format.</p>
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Associated Types<a href='#associated-types' class='anchor'></a>
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<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
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deserialization.</p>
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</div><h3 id='associatedtype.Variant' class='method'><span id='Variant.t' class='invisible'><code>type <a href='#associatedtype.Variant' class="type">Variant</a>: <a class="trait" href="../../serde/de/trait.VariantAccess.html" title="trait serde::de::VariantAccess">VariantAccess</a><'de, Error = Self::<a class="type" href="../../serde/de/trait.EnumAccess.html#associatedtype.Error" title="type serde::de::EnumAccess::Error">Error</a>></code></span></h3><div class='docblock'><p>The <code>Visitor</code> that will be used to deserialize the content of the enum
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variant.</p>
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<h3 id='tymethod.variant_seed' class='method'><span id='variant_seed.v' class='invisible'><code>fn <a href='#tymethod.variant_seed' class='fnname'>variant_seed</a><V>(<br> 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="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.tuple.html">(</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.EnumAccess.html#associatedtype.Variant" title="type serde::de::EnumAccess::Variant">Variant</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.tuple.html">)</a>, Self::<a class="type" href="../../serde/de/trait.EnumAccess.html#associatedtype.Error" title="type serde::de::EnumAccess::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></span></h3><div class='docblock'><p><code>variant</code> is called to identify which variant to deserialize.</p>
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<p><code>Deserialize</code> implementations should typically use <code>EnumAccess::variant</code>
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instead.</p>
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Provided Methods<a href='#provided-methods' class='anchor'></a>
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<h3 id='method.variant' class='method'><span id='variant.v' class='invisible'><code>fn <a href='#method.variant' class='fnname'>variant</a><V>(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="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.tuple.html">(</a>V, Self::<a class="type" href="../../serde/de/trait.EnumAccess.html#associatedtype.Variant" title="type serde::de::EnumAccess::Variant">Variant</a><a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.tuple.html">)</a>, Self::<a class="type" href="../../serde/de/trait.EnumAccess.html#associatedtype.Error" title="type serde::de::EnumAccess::Error">Error</a>> <span class="where fmt-newline">where<br> V: <a class="trait" href="../../serde/trait.Deserialize.html" title="trait serde::Deserialize">Deserialize</a><'de>, </span></code></span></h3><div class='docblock'><p><code>variant</code> is called to identify which variant to deserialize.</p>
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<p>This method exists as a convenience for <code>Deserialize</code> implementations.
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<code>EnumAccess</code> implementations should not override the default behavior.</p>
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<li><div class='out-of-band'><a class='srclink' href='../../src/serde/de/value.rs.html#345-358' title='goto source code'>[src]</a></div><code>impl<'de, E> EnumAccess<'de> for <a class="struct" href="../../serde/de/value/struct.U32Deserializer.html" title="struct serde::de::value::U32Deserializer">U32Deserializer</a><E> <span class="where fmt-newline">where<br> E: <a class="trait" href="../../serde/de/trait.Error.html" title="trait serde::de::Error">Error</a>, </span><span class="where fmt-newline"> type <a href='#associatedtype.Error' class="type">Error</a> = E;</span><span class="where fmt-newline"> type <a href='#associatedtype.Variant' class="type">Variant</a> = UnitOnly<E>;</span></code></li>
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<li><div class='out-of-band'><a class='srclink' href='../../src/serde/de/value.rs.html#419-432' title='goto source code'>[src]</a></div><code>impl<'de, 'a, E> EnumAccess<'de> for <a class="struct" href="../../serde/de/value/struct.StrDeserializer.html" title="struct serde::de::value::StrDeserializer">StrDeserializer</a><'a, E> <span class="where fmt-newline">where<br> E: <a class="trait" href="../../serde/de/trait.Error.html" title="trait serde::de::Error">Error</a>, </span><span class="where fmt-newline"> type <a href='#associatedtype.Error' class="type">Error</a> = E;</span><span class="where fmt-newline"> type <a href='#associatedtype.Variant' class="type">Variant</a> = UnitOnly<E>;</span></code></li>
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<li><div class='out-of-band'><a class='srclink' href='../../src/serde/de/value.rs.html#490-503' title='goto source code'>[src]</a></div><code>impl<'de, E> EnumAccess<'de> for <a class="struct" href="../../serde/de/value/struct.BorrowedStrDeserializer.html" title="struct serde::de::value::BorrowedStrDeserializer">BorrowedStrDeserializer</a><'de, E> <span class="where fmt-newline">where<br> E: <a class="trait" href="../../serde/de/trait.Error.html" title="trait serde::de::Error">Error</a>, </span><span class="where fmt-newline"> type <a href='#associatedtype.Error' class="type">Error</a> = E;</span><span class="where fmt-newline"> type <a href='#associatedtype.Variant' class="type">Variant</a> = UnitOnly<E>;</span></code></li>
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<li><div class='out-of-band'><a class='srclink' href='../../src/serde/de/value.rs.html#576-589' title='goto source code'>[src]</a></div><code>impl<'de, 'a, E> EnumAccess<'de> for <a class="struct" href="../../serde/de/value/struct.StringDeserializer.html" title="struct serde::de::value::StringDeserializer">StringDeserializer</a><E> <span class="where fmt-newline">where<br> E: <a class="trait" href="../../serde/de/trait.Error.html" title="trait serde::de::Error">Error</a>, </span><span class="where fmt-newline"> type <a href='#associatedtype.Error' class="type">Error</a> = E;</span><span class="where fmt-newline"> type <a href='#associatedtype.Variant' class="type">Variant</a> = UnitOnly<E>;</span></code></li>
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<li><div class='out-of-band'><a class='srclink' href='../../src/serde/de/value.rs.html#665-678' title='goto source code'>[src]</a></div><code>impl<'de, 'a, E> EnumAccess<'de> for <a class="struct" href="../../serde/de/value/struct.CowStrDeserializer.html" title="struct serde::de::value::CowStrDeserializer">CowStrDeserializer</a><'a, E> <span class="where fmt-newline">where<br> E: <a class="trait" href="../../serde/de/trait.Error.html" title="trait serde::de::Error">Error</a>, </span><span class="where fmt-newline"> type <a href='#associatedtype.Error' class="type">Error</a> = E;</span><span class="where fmt-newline"> type <a href='#associatedtype.Variant' class="type">Variant</a> = UnitOnly<E>;</span></code></li>
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