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<div class="title">std::pair&lt; First, Second &gt; Struct Template Reference<div class="ingroups"><a class="el" href="group__group-ext.html">External adapters</a> &raquo; <a class="el" href="group__group-ext-std.html">Standard library adapters</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;typename First, typename Second&gt;<br />
struct std::pair&lt; First, Second &gt;</h3>
<p>Adaptation of <code><a class="el" href="structstd_1_1pair.html" title="Adaptation of std::pair for Hana.">std::pair</a></code> for Hana. </p>
<h2><a class="anchor" id="autotoc_md17"></a>
Modeled concepts</h2>
<p>A <code><a class="el" href="structstd_1_1pair.html" title="Adaptation of std::pair for Hana.">std::pair</a></code> models exactly the same concepts as a <code>hana::pair</code>. Please refer to the documentation of <code>hana::pair</code> for details.</p>
<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="ext_2std_2pair_8hpp.html">boost/hana/ext/std/pair.hpp</a>&gt;</span></div>
<div class="line"><span class="preprocessor">#include &lt;<a class="code" href="first_8hpp.html">boost/hana/first.hpp</a>&gt;</span></div>
<div class="line"><span class="preprocessor">#include &lt;<a class="code" href="less_8hpp.html">boost/hana/less.hpp</a>&gt;</span></div>
<div class="line"><span class="preprocessor">#include &lt;<a class="code" href="not__equal_8hpp.html">boost/hana/not_equal.hpp</a>&gt;</span></div>
<div class="line"><span class="preprocessor">#include &lt;<a class="code" href="second_8hpp.html">boost/hana/second.hpp</a>&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">constexpr <span class="keyword">auto</span> pair = std::make_pair(1, <span class="charliteral">&#39;x&#39;</span>);</div>
<div class="line"> </div>
<div class="line">static_assert(<a class="code" href="group__group-_product.html#ga34bbf4281de06dc3540441e8b2bd24f4">hana::first</a>(pair) == 1, <span class="stringliteral">&quot;&quot;</span>);</div>
<div class="line">static_assert(<a class="code" href="group__group-_product.html#ga7bb979d59ffc3ab862cb7d9dc7730077">hana::second</a>(pair) == <span class="charliteral">&#39;x&#39;</span>, <span class="stringliteral">&quot;&quot;</span>);</div>
<div class="line"> </div>
<div class="line">static_assert(<a class="code" href="group__group-_comparable.html#gae33be2e0d5e04f19082f4b7740dfc9cd">hana::not_equal</a>(pair, std::make_pair(3, <span class="charliteral">&#39;z&#39;</span>)), <span class="stringliteral">&quot;&quot;</span>);</div>
<div class="line">static_assert(<a class="code" href="group__group-_orderable.html#gad510011602bdb14686f1c4ec145301c9">hana::less</a>(pair, std::make_pair(3, <span class="charliteral">&#39;x&#39;</span>)), <span class="stringliteral">&quot;&quot;</span>);</div>
<div class="line"> </div>
<div class="line"><span class="keywordtype">int</span> main() { }</div>
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<div class="ttc" id="aless_8hpp_html"><div class="ttname"><a href="less_8hpp.html">less.hpp</a></div><div class="ttdoc">Defines boost::hana::less.</div></div>
<div class="ttc" id="agroup__group-_orderable_html_gad510011602bdb14686f1c4ec145301c9"><div class="ttname"><a href="group__group-_orderable.html#gad510011602bdb14686f1c4ec145301c9">boost::hana::less</a></div><div class="ttdeci">constexpr auto less</div><div class="ttdoc">Returns a Logical representing whether x is less than y.</div><div class="ttdef"><b>Definition:</b> less.hpp:37</div></div>
<div class="ttc" id="agroup__group-_product_html_ga7bb979d59ffc3ab862cb7d9dc7730077"><div class="ttname"><a href="group__group-_product.html#ga7bb979d59ffc3ab862cb7d9dc7730077">boost::hana::second</a></div><div class="ttdeci">constexpr auto second</div><div class="ttdoc">Returns the second element of a pair.</div><div class="ttdef"><b>Definition:</b> second.hpp:32</div></div>
<div class="ttc" id="aext_2std_2pair_8hpp_html"><div class="ttname"><a href="ext_2std_2pair_8hpp.html">pair.hpp</a></div><div class="ttdoc">Adapts std::pair for use with Hana.</div></div>
<div class="ttc" id="anamespaceboost_1_1hana_html"><div class="ttname"><a href="namespaceboost_1_1hana.html">boost::hana</a></div><div class="ttdoc">Namespace containing everything in the library.</div><div class="ttdef"><b>Definition:</b> accessors.hpp:20</div></div>
<div class="ttc" id="afirst_8hpp_html"><div class="ttname"><a href="first_8hpp.html">first.hpp</a></div><div class="ttdoc">Defines boost::hana::first.</div></div>
<div class="ttc" id="anot__equal_8hpp_html"><div class="ttname"><a href="not__equal_8hpp.html">not_equal.hpp</a></div><div class="ttdoc">Defines boost::hana::not_equal.</div></div>
<div class="ttc" id="asecond_8hpp_html"><div class="ttname"><a href="second_8hpp.html">second.hpp</a></div><div class="ttdoc">Defines boost::hana::second.</div></div>
<div class="ttc" id="agroup__group-_comparable_html_gae33be2e0d5e04f19082f4b7740dfc9cd"><div class="ttname"><a href="group__group-_comparable.html#gae33be2e0d5e04f19082f4b7740dfc9cd">boost::hana::not_equal</a></div><div class="ttdeci">constexpr auto not_equal</div><div class="ttdoc">Returns a Logical representing whether x is not equal to y.</div><div class="ttdef"><b>Definition:</b> not_equal.hpp:54</div></div>
<div class="ttc" id="agroup__group-_product_html_ga34bbf4281de06dc3540441e8b2bd24f4"><div class="ttname"><a href="group__group-_product.html#ga34bbf4281de06dc3540441e8b2bd24f4">boost::hana::first</a></div><div class="ttdeci">constexpr auto first</div><div class="ttdoc">Returns the first element of a pair.</div><div class="ttdef"><b>Definition:</b> first.hpp:33</div></div>
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