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Serialize enum as number
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<a href="." >Serialize enum as number</a>
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<h1 id="serialize-enum-as-number"><a name="serialize-enum-as-number" class="plugin-anchor" href="#serialize-enum-as-number"><i class="fa fa-link" aria-hidden="true"></i></a>Serialize enum as number</h1>
<p>The <a href="https://github.com/dtolnay/serde-repr" target="_blank">serde_repr</a> crate provides alternative derive macros that derive the same
Serialize and Deserialize traits but delegate to the underlying representation
of a C-like enum. This allows C-like enums to be formatted as integers rather
than strings in JSON, for example.</p>
<pre><code class="lang-toml"><span class="hljs-section">[dependencies]</span>
<span class="hljs-attr">serde</span> = <span class="hljs-string">"1.0"</span>
<span class="hljs-attr">serde_json</span> = <span class="hljs-string">"1.0"</span>
<span class="hljs-attr">serde_repr</span> = <span class="hljs-string">"0.1"</span>
</code></pre>
<pre><code class="lang-rust"><span class="hljs-keyword">use</span> serde_repr::*;
<span class="hljs-meta">#[derive(Serialize_repr, Deserialize_repr, PartialEq, Debug)]</span>
<span class="hljs-meta">#[repr(u8)]</span>
<span class="hljs-class"><span class="hljs-keyword">enum</span> <span class="hljs-title">SmallPrime</span></span> {
Two = <span class="hljs-number">2</span>,
Three = <span class="hljs-number">3</span>,
Five = <span class="hljs-number">5</span>,
Seven = <span class="hljs-number">7</span>,
}
<span class="hljs-function"><span class="hljs-keyword">fn</span> <span class="hljs-title">main</span></span>() {
<span class="hljs-keyword">use</span> SmallPrime::*;
<span class="hljs-keyword">let</span> nums = <span class="hljs-built_in">vec!</span>[Two, Three, Five, Seven];
<span class="hljs-comment">// Prints [2,3,5,7]</span>
<span class="hljs-built_in">println!</span>(<span class="hljs-string">"{}"</span>, serde_json::to_string(&nums).unwrap());
<span class="hljs-built_in">assert_eq!</span>(Two, serde_json::from_str(<span class="hljs-string">"2"</span>).unwrap());
}
</code></pre>
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