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<p class='location'>Trait Expected</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.fmt">fmt</a></div><a class="sidebar-title" href="#foreign-impls">Implementations on Foreign Types</a><div class="sidebar-links"><a href="#impl-Expected">&'a str</a></div><a class="sidebar-title" href="#implementors">Implementors</a><a class="sidebar-title" href="#implementations">Trait Implementations</a><div class="sidebar-links"><a href="#impl-Display">Display</a></div></div><p class='location'><a href='../index.html'>serde</a>::<wbr><a href='index.html'>de</a></p><script>window.sidebarCurrent = {name: 'Expected', ty: 'trait', relpath: ''};</script><script defer src="sidebar-items.js"></script></div>
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<section id='main' class="content">
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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=''>Expected</a></span><span class='out-of-band'><span id='render-detail'>
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[<span class='inner'>−</span>]
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</a>
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</span><a class='srclink' href='../../src/serde/de/mod.rs.html#462-466' title='goto source code'>[src]</a></span></h1>
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<pre class='rust trait'>pub trait Expected {
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fn <a href='#tymethod.fmt' class='fnname'>fmt</a>(&self, formatter: &mut <a class="struct" href="https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a>) -> <a class="type" href="https://doc.rust-lang.org/nightly/core/fmt/type.Result.html" title="type core::fmt::Result">Result</a>;
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}</pre><div class='docblock'><p><code>Expected</code> represents an explanation of what data a <code>Visitor</code> was expecting
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to receive.</p>
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<p>This is used as an argument to the <code>invalid_type</code>, <code>invalid_value</code>, and
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<code>invalid_length</code> methods of the <code>Error</code> trait to build error messages. The
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message should be a noun or noun phrase that completes the sentence "This
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Visitor expects to receive ...", for example the message could be "an
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integer between 0 and 64". The message should not be capitalized and should
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not end with a period.</p>
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<p>Within the context of a <code>Visitor</code> implementation, the <code>Visitor</code> itself
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(<code>&self</code>) is an implementation of this trait.</p>
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<pre class="rust rust-example-rendered">
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<span class="kw">fn</span> <span class="ident">visit_bool</span><span class="op"><</span><span class="ident">E</span><span class="op">></span>(<span class="self">self</span>, <span class="ident">v</span>: <span class="ident">bool</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="self">Self</span>::<span class="ident">Value</span>, <span class="ident">E</span><span class="op">></span>
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<span class="kw">where</span>
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<span class="ident">E</span>: <span class="ident">de</span>::<span class="ident">Error</span>,
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{
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<span class="prelude-val">Err</span>(<span class="ident">de</span>::<span class="ident">Error</span>::<span class="ident">invalid_type</span>(<span class="ident">Unexpected</span>::<span class="ident">Bool</span>(<span class="ident">v</span>), <span class="kw-2">&</span><span class="self">self</span>))
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}</pre>
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<p>Outside of a <code>Visitor</code>, <code>&"..."</code> can be used.</p>
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<pre class="rust rust-example-rendered">
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<span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">de</span>::<span class="ident">Error</span>::<span class="ident">invalid_type</span>(<span class="ident">Unexpected</span>::<span class="ident">Bool</span>(<span class="ident">v</span>), <span class="kw-2">&</span><span class="string">"a negative integer"</span>));</pre>
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</div>
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<h2 id='required-methods' class='small-section-header'>
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Required Methods<a href='#required-methods' class='anchor'></a>
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</h2>
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<div class='methods'>
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<h3 id='tymethod.fmt' class='method'><span id='fmt.v' class='invisible'><code>fn <a href='#tymethod.fmt' class='fnname'>fmt</a>(&self, formatter: &mut <a class="struct" href="https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a>) -> <a class="type" href="https://doc.rust-lang.org/nightly/core/fmt/type.Result.html" title="type core::fmt::Result">Result</a></code></span></h3><div class='docblock'><p>Format an explanation of what data was being expected. Same signature as
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the <code>Display</code> and <code>Debug</code> traits.</p>
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</div></div>
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<h2 id='implementations' class='small-section-header'>
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Trait Implementations<a href='#implementations' class='anchor'></a>
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</h2>
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<h3 id='impl-Display' class='impl'><span class='in-band'><code>impl<'a> <a class="trait" href="https://doc.rust-lang.org/nightly/core/fmt/trait.Display.html" title="trait core::fmt::Display">Display</a> for <a class="trait" href="../../serde/de/trait.Expected.html" title="trait serde::de::Expected">Expected</a> + 'a</code><a href='#impl-Display' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/serde/de/mod.rs.html#483-487' title='goto source code'>[src]</a></span></h3>
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<div class='impl-items'><h4 id='method.fmt' class="method"><span id='fmt.v-1' class='invisible'><code>fn <a href='https://doc.rust-lang.org/nightly/core/fmt/trait.Display.html#tymethod.fmt' class='fnname'>fmt</a>(&self, formatter: &mut <a class="struct" href="https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a>) -> <a class="type" href="https://doc.rust-lang.org/nightly/core/fmt/type.Result.html" title="type core::fmt::Result">Result</a></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/serde/de/mod.rs.html#484-486' title='goto source code'>[src]</a></span></h4>
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<div class='docblock'><p>Formats the value using the given formatter. <a href="https://doc.rust-lang.org/nightly/core/fmt/trait.Display.html#tymethod.fmt">Read more</a></p>
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</div></div>
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<h2 id='foreign-impls' class='small-section-header'>
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Implementations on Foreign Types<a href='#foreign-impls' class='anchor'></a>
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</h2>
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<h3 id='impl-Expected' class='impl'><span class='in-band'><code>impl<'a> <a class="trait" href="../../serde/de/trait.Expected.html" title="trait serde::de::Expected">Expected</a> for &'a <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.str.html">str</a></code><a href='#impl-Expected' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/serde/de/mod.rs.html#477-481' title='goto source code'>[src]</a></span></h3>
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<span class='docblock autohide'><div class='impl-items'><h4 id='method.fmt-1' class="method"><span id='fmt.v-2' class='invisible'><code>fn <a href='#method.fmt' class='fnname'>fmt</a>(&self, formatter: &mut <a class="struct" href="https://doc.rust-lang.org/nightly/core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a>) -> <a class="type" href="https://doc.rust-lang.org/nightly/core/fmt/type.Result.html" title="type core::fmt::Result">Result</a></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/serde/de/mod.rs.html#478-480' title='goto source code'>[src]</a></span></h4>
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<li><div class='out-of-band'><a class='srclink' href='../../src/serde/de/mod.rs.html#468-475' title='goto source code'>[src]</a></div><code>impl<'de, T> Expected for T <span class="where fmt-newline">where<br> T: <a class="trait" href="../../serde/de/trait.Visitor.html" title="trait serde::de::Visitor">Visitor</a><'de>, </span></code></li>
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