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Peter Dimov
2019-05-12 00:13:38 +03:00
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@ -445,7 +445,16 @@ body.book #toc,body.book #preamble,body.book h1.sect0,body.book .sect1>h2{page-b
<div id="toc" class="toc2">
<div id="toctitle">Table of Contents</div>
<ul class="sectlevel1">
<li><a href="#overview">Overview</a></li>
<li><a href="#overview">Overview</a>
<ul class="sectlevel2">
<li><a href="#overview_description">Description</a></li>
<li><a href="#overview_usage_examples">Usage Examples</a></li>
<li><a href="#overview_construction_and_assignment">Construction and Assignment</a></li>
<li><a href="#overview_inspecting_the_value">Inspecting the Value</a></li>
<li><a href="#overview_visitation">Visitation</a></li>
<li><a href="#overview_default_construction">Default Construction</a></li>
</ul>
</li>
<li><a href="#reference">Reference</a>
<ul class="sectlevel2">
<li><a href="#ref_boostvariant2variant_hpp">&lt;boost/variant2/variant.hpp&gt;</a>
@ -483,6 +492,8 @@ body.book #toc,body.book #preamble,body.book h1.sect0,body.book .sect1>h2{page-b
<div class="sect1">
<h2 id="overview">Overview</h2>
<div class="sectionbody">
<div class="sect2">
<h3 id="overview_description">Description</h3>
<div class="paragraph">
<p>This library implements a type-safe discriminated/tagged union type,
<code>variant&lt;T&#8230;&#8203;&gt;</code>, that is API-compatible with the C&#43;&#43;17 Standard&#8217;s
@ -515,6 +526,9 @@ equivalent to</p>
};</code></pre>
</div>
</div>
</div>
<div class="sect2">
<h3 id="overview_usage_examples">Usage Examples</h3>
<div class="paragraph">
<p>Variants can be used to represent dynamically-typed values. A configuration
file of the form</p>
@ -650,6 +664,9 @@ int main()
}</code></pre>
</div>
</div>
</div>
<div class="sect2">
<h3 id="overview_construction_and_assignment">Construction and Assignment</h3>
<div class="paragraph">
<p>If we look at the</p>
</div>
@ -684,6 +701,9 @@ variant::variant(float x);</code></pre>
<p>and the standard overload resolution rules are used to pick the one that will
be used. So <code>variant&lt;int, float&gt;((short)1)</code> will hold an <code>int</code>.</p>
</div>
</div>
<div class="sect2">
<h3 id="overview_inspecting_the_value">Inspecting the Value</h3>
<div class="paragraph">
<p>Putting values into a <code>variant</code> is easy, but taking them out is necessarily a
bit more convoluted. It&#8217;s not possible for <code>variant&lt;int, float&gt;</code> to define a
@ -765,6 +785,9 @@ the following lines:</p>
}</code></pre>
</div>
</div>
</div>
<div class="sect2">
<h3 id="overview_visitation">Visitation</h3>
<div class="paragraph">
<p>Last but not least, there&#8217;s <code>visit</code>. <code>visit(f, v)</code> calls the a function object
<code>f</code> with the value contained in the <code>variant</code> <code>v</code> and returns the result. When
@ -819,6 +842,9 @@ example:</p>
<code>f(x1, x2)</code>, where <code>x1</code> is the value contained in <code>v1</code> and <code>x2</code> is the value
in <code>v2</code>.</p>
</div>
</div>
<div class="sect2">
<h3 id="overview_default_construction">Default Construction</h3>
<div class="paragraph">
<p>The default constructor of <code>variant</code> value-initializes the first type in
the list. <code>variant&lt;int, float&gt;{}</code> holds <code>0</code> (of type <code>int</code>), and
@ -834,6 +860,7 @@ which is basically a no-op, as <code>monostate</code> is effectively an empty <c
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="reference">Reference</h2>
<div class="sectionbody">
@ -2492,7 +2519,7 @@ the <a href="http://www.boost.org/LICENSE_1_0.txt">Boost Software License, Versi
</div>
<div id="footer">
<div id="footer-text">
Last updated 2019-05-11 17:49:15 +0300
Last updated 2019-05-12 00:11:41 +0300
</div>
</div>
<style>