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macro.sus_choice_types.html
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<meta name="description" content="A macro used to declare the value-type pairings in a Choice. See the Choice type for examples of its use."></meta>
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macro
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<a href="#">sus_choice_types</a>
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<h1 class="section-header">
<span>
Macro
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<a class="project-name" href="index.html">Subspace</a>
<span class="namespace-dots">::</span>
<a class="macro-name" href="#">sus_choice_types</a>
</h1>
<div class="overload-set">
<div class="overload">
<div class="macro-signature"><div class="src rightside"><a href="https://github.com/chromium/subspace/blob/main/sus/choice/choice_types.h#L57">source</a></div><span class="macro-define">#define</span> <a class="macro-name" href="#">sus_choice_types</a>(...)</div>
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</div>
<div class="description long">
<p>A macro used to declare the value-type pairings in a <a href="sus-choice_type-Choice.html"><code>Choice</code></a>. See the <a href="sus-choice_type-Choice.html"><code>Choice</code></a> type for examples of its use.</p>
<p>Constructs a set of associated value and types pairings. The type of the
values need have no relationship to the specified types.</p>
<h1><a name="details" href="#details">Details</a></h1>
<p>The input takes the format: <code>(Value1, Type1A, Type1B), (Value2, Type2), ...</code>
The output is the sequence <code>TypeList<Tuple<Type1A, Type1B>, Tuple<Type2>, ...>, Value1, Value2, ...</code>.
Use <code>sus::macros::value_types::TypeAt<I, Types<...>></code> to extract each tuple
type from the returned set of types.</p>
<p>The number of values that follow will always be the same as the number of
types in the set. This is the primary value of the <code>sus_choice_types()</code>
construct.</p>
<h1><a name="example" href="#example">Example</a></h1>
<pre><code><span class="keyword">template</span> <span class="punct"><</span><span class="keyword">class</span> Types<span class="punct">,</span> <span class="keyword">auto</span> FirstValue<span class="punct">,</span> <span class="keyword">auto</span><span class="punct">.</span><span class="punct">.</span><span class="punct">.</span> Values<span class="punct">></span>
<span class="keyword">class</span> Example <span class="punct">{</span>
<span class="keyword">using</span> first_type <span class="punct">=</span> v<span class="punct"><</span>0<span class="punct">,</span> Types<span class="punct">></span><span class="punct">;</span>
<span class="keyword">static</span> <span class="keyword">constexpr</span> <span class="keyword">auto</span> first_value <span class="punct">=</span> FirstValue<span class="punct">;</span>
<span class="punct">}</span><span class="punct">;</span>
<span class="keyword">using</span> E <span class="punct">=</span> Example<span class="punct"><</span>sus_choice_types<span class="punct">(</span><span class="punct">(</span><span class="char">'h'</span><span class="punct">,</span> i32<span class="punct">)</span><span class="punct">,</span> <span class="punct">(</span><span class="char">'w'</span><span class="punct">,</span> f32<span class="punct">)</span><span class="punct">)</span><span class="punct">></span><span class="punct">;</span>
<span class="comment">// `E::first_value` will be `'h'` of type `char`.</span>
<span class="comment">// `E::first_type` will be `Tuple<i32>`.</span>
</code></pre>
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