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<div class="title">boost::hana::embedding&lt; bool &gt; Struct Template Reference<div class="ingroups"><a class="el" href="group__group-core.html">Core</a></div></div>  </div>
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<a name="details" id="details"></a><h2 class="groupheader">Description</h2>
<div class="textblock"><h3>template&lt;bool = true&gt;<br />
struct boost::hana::embedding&lt; bool &gt;</h3>

<p>Marks a conversion between data types as being an embedding. </p>
<p>To mark a conversion between two data types <code>To</code> and <code>From</code> as an embedding, simply use <code>embedding&lt;true&gt;</code> (or simply <code>embedding&lt;&gt;</code>) as a base class of the corresponding <code>to_impl</code> specialization. If a <code>to_impl</code> specialization does not inherit <code>embedding&lt;true&gt;</code> or <code>embedding&lt;&gt;</code>, then it is not considered an embedding by the <code><a class="el" href="structboost_1_1hana_1_1is__embedded.html" title="Returns whether a data type can be embedded into another data type.">is_embedded</a></code> metafunction.</p>
<blockquote class="doxtable">
<h4>Tip</h4>
<p>The boolean template parameter is useful for marking a conversion as an embedding only when some condition is satisfied. </p>
</blockquote>
<h2>Example </h2>
<div class="fragment"><div class="line"><span class="comment">// Copyright Louis Dionne 2013-2017</span></div><div class="line"><span class="comment">// Distributed under the Boost Software License, Version 1.0.</span></div><div class="line"><span class="comment">// (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)</span></div><div class="line"></div><div class="line"><span class="preprocessor">#include &lt;<a class="code" href="assert_8hpp.html">boost/hana/assert.hpp</a>&gt;</span></div><div class="line"><span class="preprocessor">#include &lt;<a class="code" href="core_2to_8hpp.html">boost/hana/core/to.hpp</a>&gt;</span></div><div class="line"><span class="preprocessor">#include &lt;<a class="code" href="core_2when_8hpp.html">boost/hana/core/when.hpp</a>&gt;</span></div><div class="line"></div><div class="line"><span class="preprocessor">#include &lt;vector&gt;</span></div><div class="line"><span class="keyword">namespace </span>hana = <a class="code" href="namespaceboost_1_1hana.html">boost::hana</a>;</div><div class="line"></div><div class="line"></div><div class="line"><span class="keyword">namespace </span>boost { <span class="keyword">namespace </span>hana {</div><div class="line">    <span class="keyword">template</span> &lt;<span class="keyword">typename</span> To, <span class="keyword">typename</span> From&gt;</div><div class="line">    <span class="keyword">struct </span>to_impl&lt;std::vector&lt;To&gt;, std::vector&lt;From&gt;,</div><div class="line">        when&lt;is_convertible&lt;From, To&gt;::value&gt;&gt;</div><div class="line">        : embedding&lt;is_embedded&lt;From, To&gt;::value&gt;</div><div class="line">    {</div><div class="line">        <span class="keyword">static</span> std::vector&lt;To&gt; <a class="code" href="group__group-functional.html#ga30027c383676084be151ef3c6cf2829f">apply</a>(std::vector&lt;From&gt; <span class="keyword">const</span>&amp; xs) {</div><div class="line">            std::vector&lt;To&gt; result;</div><div class="line">            <span class="keywordflow">for</span> (<span class="keyword">auto</span> <span class="keyword">const</span>&amp; x: xs)</div><div class="line">                result.push_back(to&lt;To&gt;(x));</div><div class="line">            <span class="keywordflow">return</span> result;</div><div class="line">        }</div><div class="line">    };</div><div class="line">}}</div><div class="line"></div><div class="line"><span class="keywordtype">int</span> main() {</div><div class="line">    <a class="code" href="group__group-assertions.html#ga4796ae107d58b67e0bbccd5ae6f70101">BOOST_HANA_RUNTIME_CHECK</a>(</div><div class="line">        <a class="code" href="group__group-core.html#gadc70755c1d059139297814fb3bfeb91e">hana::to</a>&lt;std::vector&lt;int&gt;&gt;(std::vector&lt;float&gt;{1.1, 2.2, 3.3})</div><div class="line">                        ==</div><div class="line">        std::vector&lt;int&gt;{1, 2, 3}</div><div class="line">    );</div><div class="line"></div><div class="line">    static_assert(!hana::is_embedded&lt;std::vector&lt;float&gt;, std::vector&lt;int&gt;&gt;{}, <span class="stringliteral">&quot;&quot;</span>);</div><div class="line">}</div></div><!-- fragment --> </div></div><!-- contents -->
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