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Attributes
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Container attributes
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Variant attributes
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<h1>
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<a href="." >Attributes</a>
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<h1 id="attributes"><a name="attributes" class="plugin-anchor" href="#attributes"><i class="fa fa-link" aria-hidden="true"></i></a>Attributes</h1>
<p><a href="https://doc.rust-lang.org/book/attributes.html" target="_blank">Attributes</a> are used to customize the <code>Serialize</code> and <code>Deserialize</code>
implementations produced by Serde's derive. They require a Rust compiler version
1.15 or newer.</p>
<p>There are three categories of attributes:</p>
<ul>
<li><a href="container-attrs.html"><strong>Container attributes</strong></a> — apply to a struct or enum declaration.</li>
<li><a href="variant-attrs.html"><strong>Variant attributes</strong></a> — apply to a variant of an enum.</li>
<li><a href="field-attrs.html"><strong>Field attributes</strong></a> — apply to one field in a struct or in an enum variant.</li>
</ul>
<pre><code class="lang-rust"><span class="hljs-meta">#[derive(Serialize, Deserialize)]</span>
<span class="hljs-meta">#[serde(deny_unknown_fields)]</span> <span class="hljs-comment">// <-- this is a container attribute</span>
<span class="hljs-class"><span class="hljs-keyword">struct</span> <span class="hljs-title">S</span></span> {
<span class="hljs-meta">#[serde(default)]</span> <span class="hljs-comment">// <-- this is a field attribute</span>
f: <span class="hljs-keyword">i32</span>,
}
<span class="hljs-meta">#[derive(Serialize, Deserialize)]</span>
<span class="hljs-meta">#[serde(rename = <span class="hljs-meta-string">"e"</span>)]</span> <span class="hljs-comment">// <-- this is also a container attribute</span>
<span class="hljs-class"><span class="hljs-keyword">enum</span> <span class="hljs-title">E</span></span> {
<span class="hljs-meta">#[serde(rename = <span class="hljs-meta-string">"a"</span>)]</span> <span class="hljs-comment">// <-- this is a variant attribute</span>
A(<span class="hljs-built_in">String</span>),
}
</code></pre>
<p>Note that a single struct, enum, variant, or field may have multiple attributes
on it.</p>
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