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<div class="title">boost::mpl::vector&lt; T &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-mpl.html">Boost.MPL 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 ... T&gt;<br />
struct boost::mpl::vector&lt; T &gt;</h3>

<p>Adapter for Boost.MPL vectors. </p>
<h2>Modeled concepts </h2>
<p>It is possible for MPL vectors to model a couple of concepts. However, because they are only able to hold types, they lack the generality required to model concepts like <code>Functor</code>, <code>Sequence</code> and other related concepts.</p>
<ol type="1">
<li><code>Comparable</code><br />
Two MPL vectors are equal if and only if they contain the same number of types, and if all those types are equal. <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="equal_8hpp.html">boost/hana/equal.hpp</a>&gt;</span></div><div class="line"><span class="preprocessor">#include &lt;<a class="code" href="boost_2mpl_2vector_8hpp.html">boost/hana/ext/boost/mpl/vector.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"></div><div class="line"><span class="preprocessor">#include &lt;<a class="code" href="boost_2mpl_2vector_8hpp.html">boost/mpl/vector.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"><span class="keyword">namespace </span>mpl = boost::mpl;</div><div class="line"></div><div class="line"></div><div class="line"><a class="code" href="group__group-assertions.html#ga2c5006540936d9f8880e3a39f4fcc035">BOOST_HANA_CONSTANT_CHECK</a>(</div><div class="line">    <a class="code" href="group__group-Comparable.html#gacaf1ebea6b3ab96ac9dcb82f0e64e547">hana::equal</a>(mpl::vector2&lt;int, char&gt;{}, mpl::vector&lt;int, char&gt;{})</div><div class="line">);</div><div class="line"><a class="code" href="group__group-assertions.html#ga2c5006540936d9f8880e3a39f4fcc035">BOOST_HANA_CONSTANT_CHECK</a>(</div><div class="line">    <a class="code" href="group__group-Comparable.html#gae33be2e0d5e04f19082f4b7740dfc9cd">hana::not_equal</a>(mpl::vector2&lt;int, char&gt;{}, mpl::vector&lt;int, char, float&gt;{})</div><div class="line">);</div><div class="line"></div><div class="line"><span class="keywordtype">int</span> main() { }</div></div><!-- fragment --></li>
<li><code>Foldable</code><br />
Folding a MPL vector is equivalent to folding it as a <code>Sequence</code>. <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="equal_8hpp.html">boost/hana/equal.hpp</a>&gt;</span></div><div class="line"><span class="preprocessor">#include &lt;<a class="code" href="boost_2mpl_2vector_8hpp.html">boost/hana/ext/boost/mpl/vector.hpp</a>&gt;</span></div><div class="line"><span class="preprocessor">#include &lt;<a class="code" href="ext_2std_2integral__constant_8hpp.html">boost/hana/ext/std/integral_constant.hpp</a>&gt;</span></div><div class="line"><span class="preprocessor">#include &lt;<a class="code" href="fold__left_8hpp.html">boost/hana/fold_left.hpp</a>&gt;</span></div><div class="line"><span class="preprocessor">#include &lt;<a class="code" href="if_8hpp.html">boost/hana/if.hpp</a>&gt;</span></div><div class="line"><span class="preprocessor">#include &lt;<a class="code" href="integral__constant_8hpp.html">boost/hana/integral_constant.hpp</a>&gt;</span></div><div class="line"><span class="preprocessor">#include &lt;<a class="code" href="plus_8hpp.html">boost/hana/plus.hpp</a>&gt;</span></div><div class="line"><span class="preprocessor">#include &lt;<a class="code" href="type_8hpp.html">boost/hana/type.hpp</a>&gt;</span></div><div class="line"></div><div class="line"><span class="preprocessor">#include &lt;<a class="code" href="boost_2mpl_2vector_8hpp.html">boost/mpl/vector.hpp</a>&gt;</span></div><div class="line"><span class="preprocessor">#include &lt;type_traits&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"><span class="keyword">namespace </span>mpl = boost::mpl;</div><div class="line"></div><div class="line"></div><div class="line"><span class="keyword">auto</span> types = mpl::vector&lt;long, float, short, float, long, long double&gt;{};</div><div class="line"><span class="keyword">auto</span> number_of_floats = <a class="code" href="group__group-Foldable.html#ga38c6b3f6b1cbadb9b8432a05ff16b7d2">hana::fold_left</a>(types, hana::int_c&lt;0&gt;, [](<span class="keyword">auto</span> <a class="code" href="group__group-Foldable.html#ga3159cfa41be18a396926741b0a3fdefd">count</a>, <span class="keyword">auto</span> t) {</div><div class="line">    <span class="keywordflow">return</span> <a class="code" href="group__group-Logical.html#gafd655d2222367131e7a63616e93dd080">hana::if_</a>(hana::trait&lt;std::is_floating_point&gt;(t),</div><div class="line">        <a class="code" href="group__group-Foldable.html#ga3159cfa41be18a396926741b0a3fdefd">count</a> + hana::int_c&lt;1&gt;,</div><div class="line">        <a class="code" href="group__group-Foldable.html#ga3159cfa41be18a396926741b0a3fdefd">count</a></div><div class="line">    );</div><div class="line">});</div><div class="line"></div><div class="line"><a class="code" href="group__group-assertions.html#ga2c5006540936d9f8880e3a39f4fcc035">BOOST_HANA_CONSTANT_CHECK</a>(number_of_floats == hana::int_c&lt;3&gt;);</div><div class="line"></div><div class="line"><span class="keywordtype">int</span> main() { }</div></div><!-- fragment --></li>
<li><code>Iterable</code><br />
Iterating over a MPL vector is just iterating over each of the types it contains, as if it were a <code>Sequence</code>. <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="drop__front_8hpp.html">boost/hana/drop_front.hpp</a>&gt;</span></div><div class="line"><span class="preprocessor">#include &lt;<a class="code" href="drop__while_8hpp.html">boost/hana/drop_while.hpp</a>&gt;</span></div><div class="line"><span class="preprocessor">#include &lt;<a class="code" href="equal_8hpp.html">boost/hana/equal.hpp</a>&gt;</span></div><div class="line"><span class="preprocessor">#include &lt;<a class="code" href="boost_2mpl_2vector_8hpp.html">boost/hana/ext/boost/mpl/vector.hpp</a>&gt;</span></div><div class="line"><span class="preprocessor">#include &lt;<a class="code" href="ext_2std_2integral__constant_8hpp.html">boost/hana/ext/std/integral_constant.hpp</a>&gt;</span></div><div class="line"><span class="preprocessor">#include &lt;<a class="code" href="front_8hpp.html">boost/hana/front.hpp</a>&gt;</span></div><div class="line"><span class="preprocessor">#include &lt;<a class="code" href="type_8hpp.html">boost/hana/type.hpp</a>&gt;</span></div><div class="line"></div><div class="line"><span class="preprocessor">#include &lt;<a class="code" href="boost_2mpl_2vector_8hpp.html">boost/mpl/vector.hpp</a>&gt;</span></div><div class="line"><span class="preprocessor">#include &lt;type_traits&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"><span class="keyword">namespace </span>mpl = boost::mpl;</div><div class="line"></div><div class="line"></div><div class="line"><a class="code" href="group__group-assertions.html#ga2c5006540936d9f8880e3a39f4fcc035">BOOST_HANA_CONSTANT_CHECK</a>(<a class="code" href="group__group-Iterable.html#ga8a67ea10e8082dbe6705e573fa978444">hana::front</a>(mpl::vector&lt;int, char, void&gt;{}) == hana::type_c&lt;int&gt;);</div><div class="line"></div><div class="line"><a class="code" href="group__group-assertions.html#ga2c5006540936d9f8880e3a39f4fcc035">BOOST_HANA_CONSTANT_CHECK</a>(<a class="code" href="group__group-Comparable.html#gacaf1ebea6b3ab96ac9dcb82f0e64e547">hana::equal</a>(</div><div class="line">    <a class="code" href="group__group-Iterable.html#gad23ce0a4906e2bb0a52f38837b134757">hana::drop_front</a>(mpl::vector&lt;int, char, void&gt;{}),</div><div class="line">    mpl::vector&lt;char, void&gt;{}</div><div class="line">));</div><div class="line"></div><div class="line"><a class="code" href="group__group-assertions.html#ga2c5006540936d9f8880e3a39f4fcc035">BOOST_HANA_CONSTANT_CHECK</a>(<a class="code" href="group__group-Comparable.html#gacaf1ebea6b3ab96ac9dcb82f0e64e547">hana::equal</a>(</div><div class="line">    <a class="code" href="group__group-Iterable.html#ga9f1d02c74a6bdc1db260e0d6a8f1ee56">hana::drop_while</a>(mpl::vector&lt;float, double const, int, float&amp;&gt;{},</div><div class="line">                     hana::trait&lt;std::is_floating_point&gt;),</div><div class="line">    mpl::vector&lt;int, float&amp;&gt;{}</div><div class="line">));</div><div class="line"></div><div class="line"><span class="keywordtype">int</span> main() { }</div></div><!-- fragment --></li>
<li><code>Searchable</code><br />
A MPL vector can be searched as if it were a tuple containing <code><a class="el" href="structboost_1_1hana_1_1type.html" title="C++ type in value-level representation.">hana::type</a></code>s. <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="equal_8hpp.html">boost/hana/equal.hpp</a>&gt;</span></div><div class="line"><span class="preprocessor">#include &lt;<a class="code" href="boost_2mpl_2vector_8hpp.html">boost/hana/ext/boost/mpl/vector.hpp</a>&gt;</span></div><div class="line"><span class="preprocessor">#include &lt;<a class="code" href="find_8hpp.html">boost/hana/find.hpp</a>&gt;</span></div><div class="line"><span class="preprocessor">#include &lt;<a class="code" href="find__if_8hpp.html">boost/hana/find_if.hpp</a>&gt;</span></div><div class="line"><span class="preprocessor">#include &lt;<a class="code" href="optional_8hpp.html">boost/hana/optional.hpp</a>&gt;</span></div><div class="line"><span class="preprocessor">#include &lt;<a class="code" href="type_8hpp.html">boost/hana/type.hpp</a>&gt;</span></div><div class="line"></div><div class="line"><span class="preprocessor">#include &lt;<a class="code" href="boost_2mpl_2vector_8hpp.html">boost/mpl/vector.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"><span class="keyword">namespace </span>mpl = boost::mpl;</div><div class="line"></div><div class="line"></div><div class="line"><a class="code" href="group__group-assertions.html#ga2c5006540936d9f8880e3a39f4fcc035">BOOST_HANA_CONSTANT_CHECK</a>(</div><div class="line">    <a class="code" href="group__group-Searchable.html#ga7f99b80672aa80a7eb8b223955ce546f">hana::find_if</a>(mpl::vector&lt;int, float, char const*&gt;{}, <a class="code" href="group__group-Comparable.html#gacaf1ebea6b3ab96ac9dcb82f0e64e547">hana::equal</a>.to(hana::type_c&lt;float&gt;))</div><div class="line">    ==</div><div class="line">    hana::just(hana::type_c&lt;float&gt;)</div><div class="line">);</div><div class="line"></div><div class="line"><a class="code" href="group__group-assertions.html#ga2c5006540936d9f8880e3a39f4fcc035">BOOST_HANA_CONSTANT_CHECK</a>(</div><div class="line">    <a class="code" href="group__group-Searchable.html#ga6b6cdd69942b0fe3bf5254247f9c861e">hana::find</a>(mpl::vector&lt;int, float, char const*&gt;{}, hana::type_c&lt;void&gt;)</div><div class="line">    ==</div><div class="line">    hana::nothing</div><div class="line">);</div><div class="line"></div><div class="line"><span class="keywordtype">int</span> main() { }</div></div><!-- fragment --></li>
</ol>
<h2>Conversion from any <code>Foldable</code> </h2>
<p>A MPL vector can be created from any <code>Foldable</code>. More precisely, for a <code>Foldable</code> <code>xs</code> whose linearization is <code>[x1, ..., xn]</code>, </p><div class="fragment"><div class="line">to&lt;ext::boost::mpl::vector_tag&gt;(xs) == mpl::vector&lt;t1, ..., tn&gt;</div></div><!-- fragment --><p> where <code>tk</code> is the type of <code>xk</code>, or the type contained in <code>xk</code> if <code>xk</code> is a <code><a class="el" href="structboost_1_1hana_1_1type.html" title="C++ type in value-level representation.">hana::type</a></code>. </p><dl class="section warning"><dt>Warning</dt><dd>The limitations on the size of <code><a class="el" href="structboost_1_1mpl_1_1vector.html" title="Adapter for Boost.MPL vectors.">mpl::vector</a></code>s are inherited by this conversion utility, and hence trying to convert a <code>Foldable</code> containing more than <a href="http://www.boost.org/doc/libs/release/libs/mpl/doc/refmanual/limit-vector-size.html">BOOST_MPL_LIMIT_VECTOR_SIZE</a> elements is an error. <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="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="boost_2mpl_2vector_8hpp.html">boost/hana/ext/boost/mpl/vector.hpp</a>&gt;</span></div><div class="line"><span class="preprocessor">#include &lt;<a class="code" href="tuple_8hpp.html">boost/hana/tuple.hpp</a>&gt;</span></div><div class="line"><span class="preprocessor">#include &lt;<a class="code" href="type_8hpp.html">boost/hana/type.hpp</a>&gt;</span></div><div class="line"></div><div class="line"><span class="preprocessor">#include &lt;<a class="code" href="boost_2mpl_2vector_8hpp.html">boost/mpl/vector.hpp</a>&gt;</span></div><div class="line"><span class="preprocessor">#include &lt;type_traits&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"><span class="keyword">namespace </span>mpl = boost::mpl;</div><div class="line"></div><div class="line"></div><div class="line"><span class="keyword">auto</span> xs = hana::make_tuple(hana::type_c&lt;int&gt;, hana::type_c&lt;char&gt;, hana::type_c&lt;double&gt;);</div><div class="line">static_assert(std::is_same&lt;</div><div class="line">    decltype(hana::to&lt;hana::ext::boost::mpl::vector_tag&gt;(xs)),</div><div class="line">    mpl::vector&lt;int, char, double&gt;</div><div class="line">&gt;{}, <span class="stringliteral">&quot;&quot;</span>);</div><div class="line"></div><div class="line"><span class="keywordtype">int</span> main() { }</div></div><!-- fragment --> </dd></dl>
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