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<a href="#related">Synopsis of associated functions</a> &#124;
<a href="#friends">Friends</a> &#124;
<a href="#pub-methods">Public Member Functions</a> &#124;
<a href="structboost_1_1hana_1_1range-members.html">List of all members</a> </div>
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<div class="title">boost::hana::range&lt; T, from, to &gt; Struct Template Reference<div class="ingroups"><a class="el" href="group__group-datatypes.html">Data types</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 from, T to&gt;<br />
struct boost::hana::range&lt; T, from, to &gt;</h3>
<p>Compile-time half-open interval of <code><a class="el" href="structboost_1_1hana_1_1integral__constant.html" title="Compile-time value of an integral type.">hana::integral_constant</a></code>s. </p>
<p>A <code>range</code> represents a half-open interval of the form <code>[from, to)</code> containing <code><a class="el" href="structboost_1_1hana_1_1integral__constant.html" title="Compile-time value of an integral type.">hana::integral_constant</a></code>s of a given type. The <code>[from, to)</code> notation represents the values starting at <code>from</code> (inclusively) up to but excluding <code>from</code>. In other words, it is a bit like the list <code>from, from+1, ..., to-1</code>.</p>
<p>In particular, note that the bounds of the range can be any <code><a class="el" href="structboost_1_1hana_1_1integral__constant.html" title="Compile-time value of an integral type.">hana::integral_constant</a></code>s (negative numbers are allowed) and the range does not have to start at zero. The only requirement is that <code>from &lt;= to</code>.</p>
<dl class="section note"><dt>Note</dt><dd>The representation of <code><a class="el" href="structboost_1_1hana_1_1range.html" title="Compile-time half-open interval of hana::integral_constants.">hana::range</a></code> is implementation defined. In particular, one should not take for granted the number and types of template parameters. The proper way to create a <code><a class="el" href="structboost_1_1hana_1_1range.html" title="Compile-time half-open interval of hana::integral_constants.">hana::range</a></code> is to use <code>hana::range_c</code> or <code>hana::make_range</code>. More details <a class="el" href="index.html#tutorial-containers-types">in the tutorial</a>.</dd></dl>
<h2><a class="anchor" id="autotoc_md334"></a>
Modeled concepts</h2>
<ol type="1">
<li><code>Comparable</code><br />
Two ranges are equal if and only if they are both empty or they both span the same interval. <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="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="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="range_8hpp.html">boost/hana/range.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"><span class="comment">// empty ranges are equal</span></div>
<div class="line"><a class="code" href="group__group-assertions.html#ga2c5006540936d9f8880e3a39f4fcc035">BOOST_HANA_CONSTANT_CHECK</a>(hana::make_range(hana::int_c&lt;6&gt;, hana::int_c&lt;6&gt;) == hana::make_range(hana::int_c&lt;0&gt;, hana::int_c&lt;0&gt;));</div>
<div class="line"> </div>
<div class="line"><span class="comment">// otherwise, ranges are equal if and only if they span the same interval</span></div>
<div class="line"><a class="code" href="group__group-assertions.html#ga2c5006540936d9f8880e3a39f4fcc035">BOOST_HANA_CONSTANT_CHECK</a>(hana::make_range(hana::int_c&lt;2&gt;, hana::int_c&lt;5&gt;) == hana::make_range(hana::int_c&lt;2&gt;, hana::int_c&lt;5&gt;));</div>
<div class="line"><a class="code" href="group__group-assertions.html#ga2c5006540936d9f8880e3a39f4fcc035">BOOST_HANA_CONSTANT_CHECK</a>(hana::make_range(hana::int_c&lt;0&gt;, hana::int_c&lt;3&gt;) != hana::make_range(hana::int_c&lt;-1&gt;, 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>Foldable</code><br />
Folding a <code>range</code> is equivalent to folding a list of the <code><a class="el" href="structboost_1_1hana_1_1integral__constant.html" title="Compile-time value of an integral type.">integral_constant</a></code>s in the interval it spans. <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="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="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="range_8hpp.html">boost/hana/range.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="unpack_8hpp.html">boost/hana/unpack.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"><a class="code" href="group__group-assertions.html#ga2c5006540936d9f8880e3a39f4fcc035">BOOST_HANA_CONSTANT_CHECK</a>(</div>
<div class="line"> hana::fold_left(hana::make_range(hana::int_c&lt;0&gt;, hana::int_c&lt;4&gt;), hana::int_c&lt;0&gt;, <a class="code" href="group__group-_monoid.html#gaeb5d4a1e967e319712f9e4791948896c">hana::plus</a>) == hana::int_c&lt;6&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-_foldable.html#ga7b0c23944364ce61136e10b978ae2170">hana::unpack</a>(hana::make_range(hana::int_c&lt;-2&gt;, hana::int_c&lt;2&gt;), hana::make_tuple) ==</div>
<div class="line"> hana::make_tuple(hana::int_c&lt;-2&gt;, hana::int_c&lt;-1&gt;, hana::int_c&lt;0&gt;, hana::int_c&lt;1&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>Iterable</code><br />
Iterating over a <code>range</code> is equivalent to iterating over a list of the values it spans. In other words, iterating over the range <code>[from, to)</code> is equivalent to iterating over a list containing <code>from, from+1, from+2, ..., to-1</code>. Also note that <code>operator[]</code> can be used in place of the <code>at</code> function. <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="back_8hpp.html">boost/hana/back.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="equal_8hpp.html">boost/hana/equal.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="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="is__empty_8hpp.html">boost/hana/is_empty.hpp</a>&gt;</span></div>
<div class="line"><span class="preprocessor">#include &lt;<a class="code" href="not_8hpp.html">boost/hana/not.hpp</a>&gt;</span></div>
<div class="line"><span class="preprocessor">#include &lt;<a class="code" href="range_8hpp.html">boost/hana/range.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> r = hana::make_range(hana::int_c&lt;0&gt;, hana::int_c&lt;1000&gt;);</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>(r) == hana::int_c&lt;0&gt;);</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#gab3f4d0035345a453284e46303862d463">hana::back</a>(r) == hana::int_c&lt;999&gt;);</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#gad23ce0a4906e2bb0a52f38837b134757">hana::drop_front</a>(r) == hana::make_range(hana::int_c&lt;1&gt;, hana::int_c&lt;1000&gt;));</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#ga2a05f564f8a7e4afa04fcbc07ad8f394">hana::is_empty</a>(r));</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#ga2a05f564f8a7e4afa04fcbc07ad8f394">hana::is_empty</a>(hana::make_range(hana::int_c&lt;3&gt;, 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>Searchable</code><br />
Searching a <code>range</code> is equivalent to searching a list of the values in the range <code>[from, to)</code>, but it is much more compile-time efficient. <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="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"><span class="preprocessor">#include &lt;<a class="code" href="range_8hpp.html">boost/hana/range.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"><a class="code" href="group__group-assertions.html#ga2c5006540936d9f8880e3a39f4fcc035">BOOST_HANA_CONSTANT_CHECK</a>(<a class="code" href="group__group-_searchable.html#ga6b6cdd69942b0fe3bf5254247f9c861e">hana::find</a>(hana::make_range(hana::int_c&lt;1&gt;, hana::int_c&lt;25&gt;), hana::int_c&lt;10&gt;) == hana::just(hana::int_c&lt;10&gt;));</div>
<div class="line"><a class="code" href="group__group-assertions.html#ga2c5006540936d9f8880e3a39f4fcc035">BOOST_HANA_CONSTANT_CHECK</a>(<a class="code" href="group__group-_searchable.html#ga6b6cdd69942b0fe3bf5254247f9c861e">hana::find</a>(hana::make_range(hana::int_c&lt;1&gt;, hana::int_c&lt;25&gt;), hana::int_c&lt;200&gt;) == hana::nothing);</div>
<div class="line"> </div>
<div class="line"><span class="keywordtype">int</span> main() { }</div>
</div><!-- fragment --> </li>
</ol>
</div><table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="related"></a>
Synopsis of associated functions</h2></td></tr>
<tr class="memitem:ad5ad9a1f847daa24ef62f5d81b8eef8e"><td class="memItemLeft" align="right" valign="top">template&lt;&gt; </td></tr>
<tr class="memitem:ad5ad9a1f847daa24ef62f5d81b8eef8e"><td class="memTemplItemLeft" align="right" valign="top">constexpr auto&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="structboost_1_1hana_1_1range.html#ad5ad9a1f847daa24ef62f5d81b8eef8e">make&lt; range_tag &gt;</a></td></tr>
<tr class="memdesc:ad5ad9a1f847daa24ef62f5d81b8eef8e"><td class="mdescLeft">&#160;</td><td class="mdescRight">Create a <code><a class="el" href="structboost_1_1hana_1_1range.html" title="Compile-time half-open interval of hana::integral_constants.">hana::range</a></code> representing a half-open interval of <code><a class="el" href="structboost_1_1hana_1_1integral__constant.html" title="Compile-time value of an integral type.">integral_constant</a></code>s. <a href="structboost_1_1hana_1_1range.html#ad5ad9a1f847daa24ef62f5d81b8eef8e">More...</a><br /></td></tr>
<tr class="separator:ad5ad9a1f847daa24ef62f5d81b8eef8e"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:aba8dd69deb1d810ef65ec289127bf0ab"><td class="memItemLeft" align="right" valign="top"><a id="aba8dd69deb1d810ef65ec289127bf0ab"></a>
constexpr auto&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="structboost_1_1hana_1_1range.html#aba8dd69deb1d810ef65ec289127bf0ab">make_range</a> = <a class="el" href="group__group-core.html#ga1d92480f0af1029878e773dafa3e2f60">make</a>&lt;<a class="el" href="structboost_1_1hana_1_1range__tag.html">range_tag</a>&gt;</td></tr>
<tr class="memdesc:aba8dd69deb1d810ef65ec289127bf0ab"><td class="mdescLeft">&#160;</td><td class="mdescRight">Alias to <code>make&lt;<a class="el" href="structboost_1_1hana_1_1range__tag.html" title="Tag representing a hana::range.">range_tag</a>&gt;</code>; provided for convenience. <br /></td></tr>
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<tr class="memitem:a899b7a0c065ff64cd747fe1671753d3f"><td class="memTemplParams" colspan="2">template&lt;typename T , T from, T to&gt; </td></tr>
<tr class="memitem:a899b7a0c065ff64cd747fe1671753d3f"><td class="memTemplItemLeft" align="right" valign="top">constexpr auto&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="structboost_1_1hana_1_1range.html#a899b7a0c065ff64cd747fe1671753d3f">range_c</a> = <a class="el" href="structboost_1_1hana_1_1range.html#aba8dd69deb1d810ef65ec289127bf0ab">make_range</a>(integral_c&lt;T, from&gt;, integral_c&lt;T, <a class="el" href="group__group-core.html#gadc70755c1d059139297814fb3bfeb91e">to</a>&gt;)</td></tr>
<tr class="memdesc:a899b7a0c065ff64cd747fe1671753d3f"><td class="mdescLeft">&#160;</td><td class="mdescRight">Shorthand to create a <code><a class="el" href="structboost_1_1hana_1_1range.html" title="Compile-time half-open interval of hana::integral_constants.">hana::range</a></code> with the given bounds. <a href="structboost_1_1hana_1_1range.html#a899b7a0c065ff64cd747fe1671753d3f">More...</a><br /></td></tr>
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Friends</h2></td></tr>
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template&lt;typename X , typename Y &gt; </td></tr>
<tr class="memitem:a22bef1b2c14cf393a3a9cb1924d8c8ff"><td class="memTemplItemLeft" align="right" valign="top">constexpr friend auto&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="structboost_1_1hana_1_1range.html#a22bef1b2c14cf393a3a9cb1924d8c8ff">operator==</a> (X &amp;&amp;x, Y &amp;&amp;y)</td></tr>
<tr class="memdesc:a22bef1b2c14cf393a3a9cb1924d8c8ff"><td class="mdescLeft">&#160;</td><td class="mdescRight">Equivalent to <code><a class="el" href="group__group-_comparable.html#gacaf1ebea6b3ab96ac9dcb82f0e64e547" title="Returns a Logical representing whether x is equal to y.">hana::equal</a></code> <br /></td></tr>
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template&lt;typename X , typename Y &gt; </td></tr>
<tr class="memitem:a4ecea0deb4c00ae2eb0b0713ee0645e9"><td class="memTemplItemLeft" align="right" valign="top">constexpr friend auto&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="structboost_1_1hana_1_1range.html#a4ecea0deb4c00ae2eb0b0713ee0645e9">operator!=</a> (X &amp;&amp;x, Y &amp;&amp;y)</td></tr>
<tr class="memdesc:a4ecea0deb4c00ae2eb0b0713ee0645e9"><td class="mdescLeft">&#160;</td><td class="mdescRight">Equivalent to <code><a class="el" href="group__group-_comparable.html#gae33be2e0d5e04f19082f4b7740dfc9cd" title="Returns a Logical representing whether x is not equal to y.">hana::not_equal</a></code> <br /></td></tr>
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-methods"></a>
Public Member Functions</h2></td></tr>
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template&lt;typename N &gt; </td></tr>
<tr class="memitem:a766563b786c316320d175590fe3ad7af"><td class="memTemplItemLeft" align="right" valign="top">constexpr decltype(auto)&#160;</td><td class="memTemplItemRight" valign="bottom"><a class="el" href="structboost_1_1hana_1_1range.html#a766563b786c316320d175590fe3ad7af">operator[]</a> (N &amp;&amp;n)</td></tr>
<tr class="memdesc:a766563b786c316320d175590fe3ad7af"><td class="mdescLeft">&#160;</td><td class="mdescRight">Equivalent to <code><a class="el" href="group__group-_iterable.html#ga8a484304380eae38f3d9663d98860129" title="Returns the nth element of an iterable.">hana::at</a></code> <br /></td></tr>
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<h2 class="groupheader">Associated functions</h2>
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<h2 class="memtitle"><span class="permalink"><a href="#ad5ad9a1f847daa24ef62f5d81b8eef8e">&#9670;&nbsp;</a></span>make&lt; range_tag &gt;</h2>
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<td class="memname">constexpr auto <a class="el" href="group__group-core.html#ga1d92480f0af1029878e773dafa3e2f60">make</a>&lt; <a class="el" href="structboost_1_1hana_1_1range__tag.html">range_tag</a> &gt;</td>
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<b>Initial value:</b><div class="fragment"><div class="line">= [](<span class="keyword">auto</span> <span class="keyword">const</span>&amp; from, <span class="keyword">auto</span> <span class="keyword">const</span>&amp; <a class="code" href="group__group-core.html#gadc70755c1d059139297814fb3bfeb91e">to</a>) {</div>
<div class="line"> <span class="keywordflow">return</span> range&lt;implementation_defined&gt;{implementation_defined};</div>
<div class="line"> }</div>
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<p>Create a <code><a class="el" href="structboost_1_1hana_1_1range.html" title="Compile-time half-open interval of hana::integral_constants.">hana::range</a></code> representing a half-open interval of <code><a class="el" href="structboost_1_1hana_1_1integral__constant.html" title="Compile-time value of an integral type.">integral_constant</a></code>s. </p>
<p>Given two <code><a class="el" href="structboost_1_1hana_1_1_integral_constant.html" title="The IntegralConstant concept represents compile-time integral values.">IntegralConstant</a></code>s <code>from</code> and <code>to</code>, <code>make&lt;<a class="el" href="structboost_1_1hana_1_1range__tag.html" title="Tag representing a hana::range.">range_tag</a>&gt;</code> returns a <code><a class="el" href="structboost_1_1hana_1_1range.html" title="Compile-time half-open interval of hana::integral_constants.">hana::range</a></code> representing the half-open interval of <code><a class="el" href="structboost_1_1hana_1_1integral__constant.html" title="Compile-time value of an integral type.">integral_constant</a></code>s <code>[from, to)</code>. <code>from</code> and <code>to</code> must form a valid interval, which means that <code>from &lt;= to</code> must be true. Otherwise, a compilation error is triggered. Also note that if <code>from</code> and <code>to</code> are <code><a class="el" href="structboost_1_1hana_1_1_integral_constant.html" title="The IntegralConstant concept represents compile-time integral values.">IntegralConstant</a></code>s with different underlying integral types, the created range contains <code><a class="el" href="structboost_1_1hana_1_1integral__constant.html" title="Compile-time value of an integral type.">integral_constant</a></code>s whose underlying type is their common type.</p>
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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_2make_8hpp.html">boost/hana/core/make.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="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="range_8hpp.html">boost/hana/range.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> irange = hana::make&lt;hana::range_tag&gt;(hana::int_c&lt;0&gt;, hana::int_c&lt;10&gt;); <span class="comment">// [0, 10) int</span></div>
<div class="line"><a class="code" href="group__group-assertions.html#ga2c5006540936d9f8880e3a39f4fcc035">BOOST_HANA_CONSTANT_CHECK</a>(irange == hana::make&lt;hana::range_tag&gt;(hana::int_c&lt;0&gt;, hana::int_c&lt;10&gt;));</div>
<div class="line"> </div>
<div class="line">constexpr <span class="keyword">auto</span> lrange = hana::make&lt;hana::range_tag&gt;(hana::int_c&lt;0&gt;, hana::long_c&lt;10&gt;); <span class="comment">// [0, 10) long</span></div>
<div class="line"><a class="code" href="group__group-assertions.html#ga2c5006540936d9f8880e3a39f4fcc035">BOOST_HANA_CONSTANT_CHECK</a>(lrange == hana::make&lt;hana::range_tag&gt;(hana::long_c&lt;0&gt;, hana::long_c&lt;10&gt;));</div>
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<div class="line"><span class="keywordtype">int</span> main() { }</div>
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<h2 class="memtitle"><span class="permalink"><a href="#a899b7a0c065ff64cd747fe1671753d3f">&#9670;&nbsp;</a></span>range_c</h2>
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<td class="memname">constexpr auto range_c = <a class="el" href="structboost_1_1hana_1_1range.html#aba8dd69deb1d810ef65ec289127bf0ab">make_range</a>(integral_c&lt;T, from&gt;, integral_c&lt;T, <a class="el" href="group__group-core.html#gadc70755c1d059139297814fb3bfeb91e">to</a>&gt;)</td>
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<p>Shorthand to create a <code><a class="el" href="structboost_1_1hana_1_1range.html" title="Compile-time half-open interval of hana::integral_constants.">hana::range</a></code> with the given bounds. </p>
<p>This shorthand is provided for convenience only and it is equivalent to <code>make_range</code>. Specifically, <code>range_c&lt;T, from, to&gt;</code> is such that </p><div class="fragment"><div class="line">range_c&lt;T, from, to&gt; == <a class="code" href="structboost_1_1hana_1_1range.html#aba8dd69deb1d810ef65ec289127bf0ab">make_range</a>(integral_c&lt;T, from&gt;, integral_c&lt;T, to&gt;)</div>
</div><!-- fragment --><dl class="tparams"><dt>Template Parameters</dt><dd>
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<tr><td class="paramname">T</td><td>The underlying integral type of the <code><a class="el" href="structboost_1_1hana_1_1integral__constant.html" title="Compile-time value of an integral type.">integral_constant</a></code>s in the created range.</td></tr>
<tr><td class="paramname">from</td><td>The inclusive lower bound of the created range.</td></tr>
<tr><td class="paramname">to</td><td>The exclusive upper bound of the created range.</td></tr>
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<h2><a class="anchor" id="autotoc_md336"></a>
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="back_8hpp.html">boost/hana/back.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="equal_8hpp.html">boost/hana/equal.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="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="range_8hpp.html">boost/hana/range.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"><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>(hana::range_c&lt;int, 0, 5&gt;) == hana::int_c&lt;0&gt;);</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#gab3f4d0035345a453284e46303862d463">hana::back</a>(hana::range_c&lt;unsigned long, 0, 5&gt;) == hana::ulong_c&lt;4&gt;);</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#gad23ce0a4906e2bb0a52f38837b134757">hana::drop_front</a>(hana::range_c&lt;int, 0, 5&gt;) == hana::make_range(hana::int_c&lt;1&gt;, hana::int_c&lt;5&gt;));</div>
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<div class="line"><span class="keywordtype">int</span> main() { }</div>
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<div class="ttc" id="aequal_8hpp_html"><div class="ttname"><a href="equal_8hpp.html">equal.hpp</a></div><div class="ttdoc">Defines boost::hana::equal.</div></div>
<div class="ttc" id="agroup__group-_iterable_html_ga2a05f564f8a7e4afa04fcbc07ad8f394"><div class="ttname"><a href="group__group-_iterable.html#ga2a05f564f8a7e4afa04fcbc07ad8f394">boost::hana::is_empty</a></div><div class="ttdeci">constexpr auto is_empty</div><div class="ttdoc">Returns whether the iterable is empty.</div><div class="ttdef"><b>Definition:</b> is_empty.hpp:33</div></div>
<div class="ttc" id="adrop__front_8hpp_html"><div class="ttname"><a href="drop__front_8hpp.html">drop_front.hpp</a></div><div class="ttdoc">Defines boost::hana::drop_front.</div></div>
<div class="ttc" id="agroup__group-assertions_html_ga2c5006540936d9f8880e3a39f4fcc035"><div class="ttname"><a href="group__group-assertions.html#ga2c5006540936d9f8880e3a39f4fcc035">BOOST_HANA_CONSTANT_CHECK</a></div><div class="ttdeci">#define BOOST_HANA_CONSTANT_CHECK(...)</div><div class="ttdoc">Equivalent to BOOST_HANA_CONSTANT_ASSERT, but not influenced by the BOOST_HANA_CONFIG_DISABLE_ASSERTI...</div><div class="ttdef"><b>Definition:</b> assert.hpp:239</div></div>
<div class="ttc" id="atuple_8hpp_html"><div class="ttname"><a href="tuple_8hpp.html">tuple.hpp</a></div><div class="ttdoc">Defines boost::hana::tuple.</div></div>
<div class="ttc" id="aintegral__constant_8hpp_html"><div class="ttname"><a href="integral__constant_8hpp.html">integral_constant.hpp</a></div><div class="ttdoc">Defines boost::hana::integral_constant.</div></div>
<div class="ttc" id="acore_2make_8hpp_html"><div class="ttname"><a href="core_2make_8hpp.html">make.hpp</a></div><div class="ttdoc">Defines boost::hana::make.</div></div>
<div class="ttc" id="agroup__group-_searchable_html_ga6b6cdd69942b0fe3bf5254247f9c861e"><div class="ttname"><a href="group__group-_searchable.html#ga6b6cdd69942b0fe3bf5254247f9c861e">boost::hana::find</a></div><div class="ttdeci">constexpr auto find</div><div class="ttdoc">Finds the value associated to the given key in a structure.</div><div class="ttdef"><b>Definition:</b> find.hpp:44</div></div>
<div class="ttc" id="agroup__group-_iterable_html_ga8a67ea10e8082dbe6705e573fa978444"><div class="ttname"><a href="group__group-_iterable.html#ga8a67ea10e8082dbe6705e573fa978444">boost::hana::front</a></div><div class="ttdeci">constexpr auto front</div><div class="ttdoc">Returns the first element of a non-empty iterable.</div><div class="ttdef"><b>Definition:</b> front.hpp:32</div></div>
<div class="ttc" id="afind_8hpp_html"><div class="ttname"><a href="find_8hpp.html">find.hpp</a></div><div class="ttdoc">Defines boost::hana::find.</div></div>
<div class="ttc" id="aback_8hpp_html"><div class="ttname"><a href="back_8hpp.html">back.hpp</a></div><div class="ttdoc">Defines boost::hana::back.</div></div>
<div class="ttc" id="agroup__group-_monoid_html_gaeb5d4a1e967e319712f9e4791948896c"><div class="ttname"><a href="group__group-_monoid.html#gaeb5d4a1e967e319712f9e4791948896c">boost::hana::plus</a></div><div class="ttdeci">constexpr auto plus</div><div class="ttdoc">Associative binary operation on a Monoid.</div><div class="ttdef"><b>Definition:</b> plus.hpp:47</div></div>
<div class="ttc" id="aplus_8hpp_html"><div class="ttname"><a href="plus_8hpp.html">plus.hpp</a></div><div class="ttdoc">Defines boost::hana::plus.</div></div>
<div class="ttc" id="arange_8hpp_html"><div class="ttname"><a href="range_8hpp.html">range.hpp</a></div><div class="ttdoc">Defines boost::hana::range.</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="agroup__group-core_html_gadc70755c1d059139297814fb3bfeb91e"><div class="ttname"><a href="group__group-core.html#gadc70755c1d059139297814fb3bfeb91e">boost::hana::to</a></div><div class="ttdeci">constexpr auto to</div><div class="ttdoc">Converts an object from one data type to another.</div><div class="ttdef"><b>Definition:</b> to.hpp:97</div></div>
<div class="ttc" id="agroup__group-_foldable_html_ga7b0c23944364ce61136e10b978ae2170"><div class="ttname"><a href="group__group-_foldable.html#ga7b0c23944364ce61136e10b978ae2170">boost::hana::unpack</a></div><div class="ttdeci">constexpr auto unpack</div><div class="ttdoc">Invoke a function with the elements of a Foldable as arguments.</div><div class="ttdef"><b>Definition:</b> unpack.hpp:79</div></div>
<div class="ttc" id="aassert_8hpp_html"><div class="ttname"><a href="assert_8hpp.html">assert.hpp</a></div><div class="ttdoc">Defines macros to perform different kinds of assertions.</div></div>
<div class="ttc" id="afold__left_8hpp_html"><div class="ttname"><a href="fold__left_8hpp.html">fold_left.hpp</a></div><div class="ttdoc">Defines boost::hana::fold_left.</div></div>
<div class="ttc" id="agroup__group-_iterable_html_gad23ce0a4906e2bb0a52f38837b134757"><div class="ttname"><a href="group__group-_iterable.html#gad23ce0a4906e2bb0a52f38837b134757">boost::hana::drop_front</a></div><div class="ttdeci">constexpr auto drop_front</div><div class="ttdoc">Drop the first n elements of an iterable, and return the rest.</div><div class="ttdef"><b>Definition:</b> drop_front.hpp:47</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="ais__empty_8hpp_html"><div class="ttname"><a href="is__empty_8hpp.html">is_empty.hpp</a></div><div class="ttdoc">Defines boost::hana::is_empty.</div></div>
<div class="ttc" id="afront_8hpp_html"><div class="ttname"><a href="front_8hpp.html">front.hpp</a></div><div class="ttdoc">Defines boost::hana::front.</div></div>
<div class="ttc" id="anot_8hpp_html"><div class="ttname"><a href="not_8hpp.html">not.hpp</a></div><div class="ttdoc">Defines boost::hana::not_.</div></div>
<div class="ttc" id="agroup__group-_iterable_html_gab3f4d0035345a453284e46303862d463"><div class="ttname"><a href="group__group-_iterable.html#gab3f4d0035345a453284e46303862d463">boost::hana::back</a></div><div class="ttdeci">constexpr auto back</div><div class="ttdoc">Returns the last element of a non-empty and finite iterable.</div><div class="ttdef"><b>Definition:</b> back.hpp:32</div></div>
<div class="ttc" id="aunpack_8hpp_html"><div class="ttname"><a href="unpack_8hpp.html">unpack.hpp</a></div><div class="ttdoc">Defines boost::hana::unpack.</div></div>
<div class="ttc" id="astructboost_1_1hana_1_1range_html_aba8dd69deb1d810ef65ec289127bf0ab"><div class="ttname"><a href="structboost_1_1hana_1_1range.html#aba8dd69deb1d810ef65ec289127bf0ab">boost::hana::range::make_range</a></div><div class="ttdeci">constexpr auto make_range</div><div class="ttdoc">Alias to make&lt;range_tag&gt;; provided for convenience.</div><div class="ttdef"><b>Definition:</b> range.hpp:115</div></div>
<div class="ttc" id="aoptional_8hpp_html"><div class="ttname"><a href="optional_8hpp.html">optional.hpp</a></div><div class="ttdoc">Defines boost::hana::optional.</div></div>
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