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<div class="title">std::integer_sequence&lt; T, v &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 T, T ... v&gt;<br />
struct std::integer_sequence&lt; T, v &gt;</h3>

<p>Adaptation of <code><a class="el" href="structstd_1_1integer__sequence.html" title="Adaptation of std::integer_sequence for Hana.">std::integer_sequence</a></code> for Hana. </p>
<h2>Modeled concepts </h2>
<ol type="1">
<li><code>Comparable</code><br />
Two <code><a class="el" href="structstd_1_1integer__sequence.html" title="Adaptation of std::integer_sequence for Hana.">std::integer_sequence</a></code>s are equal if and only if they have the same number of elements, and if corresponding elements compare equal. The types of the elements held in both <code><a class="el" href="structstd_1_1integer__sequence.html" title="Adaptation of std::integer_sequence for Hana.">integer_sequence</a></code>s may be different, as long as they can be compared. <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="integer__sequence_8hpp.html">boost/hana/ext/std/integer_sequence.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;utility&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 <a class="code" href="structstd_1_1integer__sequence.html">std::integer_sequence&lt;int, 1, 2, 3, 4&gt;</a> xs{};</div><div class="line">constexpr <a class="code" href="structstd_1_1integer__sequence.html">std::integer_sequence&lt;long, 1, 2, 3, 4&gt;</a> ys{};</div><div class="line">constexpr <a class="code" href="structstd_1_1integer__sequence.html">std::integer_sequence&lt;long, 1, 2, 3, 4, 5&gt;</a> zs{};</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>(xs, ys));</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#gae33be2e0d5e04f19082f4b7740dfc9cd">hana::not_equal</a>(xs, zs));</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#gae33be2e0d5e04f19082f4b7740dfc9cd">hana::not_equal</a>(ys, zs));</div><div class="line"></div><div class="line"><span class="keywordtype">int</span> main() { }</div></div><!-- fragment --></li>
<li><code>Foldable</code><br />
Folding an <code><a class="el" href="structstd_1_1integer__sequence.html" title="Adaptation of std::integer_sequence for Hana.">integer_sequence</a></code> is equivalent to folding a sequence of <code><a class="el" href="structstd_1_1integral__constant.html" title="Adapter for std::integral_constants.">std::integral_constant</a></code>s with the corresponding types. <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="integer__sequence_8hpp.html">boost/hana/ext/std/integer_sequence.hpp</a>&gt;</span></div><div class="line"><span class="preprocessor">#include &lt;<a class="code" href="unpack_8hpp.html">boost/hana/unpack.hpp</a>&gt;</span></div><div class="line"></div><div class="line"><span class="preprocessor">#include &lt;tuple&gt;</span></div><div class="line"><span class="preprocessor">#include &lt;utility&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">auto</span> add = [](<span class="keyword">auto</span> a, <span class="keyword">auto</span> b, <span class="keyword">auto</span> c) { <span class="keywordflow">return</span> a + b + c; };</div><div class="line"></div><div class="line"><span class="keywordtype">int</span> main() {</div><div class="line">    <a class="code" href="structstd_1_1tuple.html">std::tuple&lt;int, long, double&gt;</a> tuple{1, 2l, 3.3};</div><div class="line"></div><div class="line">    <span class="keyword">auto</span> <a class="code" href="group__group-Foldable.html#ga650def4b2e98f4273d8b9b7aa5a2fc28">sum</a> = <a class="code" href="group__group-Foldable.html#ga7b0c23944364ce61136e10b978ae2170">hana::unpack</a>(<a class="code" href="structstd_1_1integer__sequence.html">std::integer_sequence&lt;int, 0, 1, 2&gt;</a>{}, [&amp;](<span class="keyword">auto</span> ...i) {</div><div class="line">        <span class="comment">// the `i`s are `std::integral_constant&lt;int, ...&gt;`s</span></div><div class="line">        <span class="keywordflow">return</span> add(std::get&lt;decltype(i)::<a class="code" href="group__group-Constant.html#ga1687520692a6b0c49e3a69de2980f388">value</a>&gt;(tuple)...);</div><div class="line">    });</div><div class="line"></div><div class="line">    <a class="code" href="group__group-assertions.html#ga4796ae107d58b67e0bbccd5ae6f70101">BOOST_HANA_RUNTIME_CHECK</a>(<a class="code" href="group__group-Foldable.html#ga650def4b2e98f4273d8b9b7aa5a2fc28">sum</a> == 6.3);</div><div class="line">}</div></div><!-- fragment --></li>
<li><code>Iterable</code><br />
Iterating over an <code><a class="el" href="structstd_1_1integer__sequence.html" title="Adaptation of std::integer_sequence for Hana.">integer_sequence</a></code> is equivalent to iterating over a sequence of the corresponding <code><a class="el" href="structstd_1_1integral__constant.html" title="Adapter for std::integral_constants.">std::integral_constant</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="at_8hpp.html">boost/hana/at.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="integer__sequence_8hpp.html">boost/hana/ext/std/integer_sequence.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"></div><div class="line"><span class="preprocessor">#include &lt;type_traits&gt;</span></div><div class="line"><span class="preprocessor">#include &lt;utility&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 <a class="code" href="structstd_1_1integer__sequence.html">std::integer_sequence&lt;int, 0, 1, 2, 3, 4&gt;</a> indices{};</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">    hana::at_c&lt;2&gt;(indices),</div><div class="line">    <a class="code" href="structstd_1_1integral__constant.html">std::integral_constant&lt;int, 2&gt;</a>{}</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 />
Searching through an <code><a class="el" href="structstd_1_1integer__sequence.html" title="Adaptation of std::integer_sequence for Hana.">integer_sequence</a></code> is equivalent to searching through the corresponding sequence of <code><a class="el" href="structstd_1_1integral__constant.html" title="Adapter for std::integral_constants.">std::integral_constant</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="integer__sequence_8hpp.html">boost/hana/ext/std/integer_sequence.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="find_8hpp.html">boost/hana/find.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="optional_8hpp.html">boost/hana/optional.hpp</a>&gt;</span></div><div class="line"></div><div class="line"><span class="preprocessor">#include &lt;type_traits&gt;</span></div><div class="line"><span class="preprocessor">#include &lt;utility&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 <a class="code" href="structstd_1_1integer__sequence.html">std::integer_sequence&lt;int, 1, 2, 3, 4&gt;</a> xs{};</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-Searchable.html#ga6b6cdd69942b0fe3bf5254247f9c861e">hana::find</a>(xs, hana::int_c&lt;3&gt;),</div><div class="line">    hana::just(<a class="code" href="structstd_1_1integral__constant.html">std::integral_constant&lt;int, 3&gt;</a>{})</div><div class="line">));</div><div class="line"></div><div class="line"><span class="keywordtype">int</span> main() { }</div></div><!-- fragment --> </li>
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