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sus-choice_type-ChoiceValueIsVoid.html
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<title>sus::choice_type::ChoiceValueIsVoid - Subspace</title>
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<meta name="description" content="A helper concept that reports if the value in a Choice for the given Tag is null. When true, the accessor and setter methods are not available."></meta>
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concept
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<a href="#">ChoiceValueIsVoid</a>
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<div class="concept">
<div class="section overview">
<h1 class="section-header">
<span>
Concept
</span>
<a class="project-name" href="index.html">Subspace</a>
<span class="namespace-dots">::</span>
<a class="namespace-name" href="namespace.sus.html">sus</a>
<span class="namespace-dots">::</span>
<a class="namespace-name" href="sus-namespace.choice_type.html">choice_type</a>
<span class="namespace-dots">::</span>
<a class="concept-name" href="#">ChoiceValueIsVoid</a>
</h1>
<div class="type-signature"><div class="src rightside"><a href="https://github.com/chromium/subspace/blob/main/sus/choice/choice.h#L59">source</a></div><pre class="template">template <class Choice, auto Tag></pre><span class="concept">
concept
</span><span class="type-name">
ChoiceValueIsVoid
</span><div>
<div class="requires">
<span class="requires-keyword keyword">
requires
</span>
<div class="requires-constraint"><pre class="requires-constraint-line">!requires(const Choice& c) {</pre><pre class="requires-constraint-line"> { c.template get<Tag>() };</pre><pre class="requires-constraint-line">}</pre></div>
</div>
</div></div>
<div class="description long">
<p>A helper concept that reports if the value in a <code>Choice</code> for the given <code>Tag</code>
is null. When true, the accessor and setter methods are not available.</p>
</div>
</div>
</div>
</section>
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