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Library/boost/libs/preprocessor/doc/ref/variadic_elem.html

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19 дек 2024, 19:11

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  <title>BOOST_PP_VARIADIC_ELEM</title>
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<div style="margin-left: 0px;"> The <b>BOOST_PP_VARIADIC_ELEM</b> variadic macro
extracts an element from <i>variadic data</i>. </div>
<h4>Usage</h4>
<div class="code"> <b>BOOST_PP_VARIADIC_ELEM</b>(<i>i</i>, <i>...</i>) <a href="../topics/variadic_macros.html#VNotation" target="_self"><sup>(v)</sup></a><br>
 </div>
<h4>Arguments</h4>
<dl><dt>i</dt>
  <dd> The zero-based index into the <i>variadic data</i> of the element to be
extracted.&nbsp; Valid values range from <i>0</i> to the size of the variadic data - 1.
  </dd>
  <dt>...<br>
</dt>
  <dd> The <i>variadic data</i> from which an element is to be extracted. </dd>
</dl>
<h4>Remarks</h4>
<div>The index <i>i</i> must be less than the size of the <i>variadic data</i>. </div>
<h4>See Also</h4>
<ul>
  <li><a href="limit_variadic.html">BOOST_PP_LIMIT_VARIADIC</a></li>
</ul>
<h4>Requirements</h4>
<div> <b>Header:</b> &nbsp;<a href="../headers/variadic/elem.html">&lt;boost/preprocessor/variadic/elem.hpp&gt;</a>
</div>
<h4>Sample Code</h4>
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<pre>#include &lt;<a href="../headers/variadic/elem.html">boost/preprocessor/variadic/elem.hpp</a>&gt;<br><br>#define VAR_DATA a, b, c, d<br><br><a href="variadic_elem.html">BOOST_PP_VARIADIC_ELEM</a>(0, VAR_DATA) // expands to a<br><a href="variadic_elem.html">BOOST_PP_VARIADIC_ELEM</a>(3, VAR_DATA) // expands to d<br></pre>
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<div style="margin-left: 0px;"> <i></i><i>� Copyright Edward Diener 2011,2013</i> </div>
<div style="margin-left: 0px;">
<p><small>Distributed under the Boost Software License, Version 1.0.
(See accompanying file <a href="../../../../LICENSE_1_0.txt">LICENSE_1_0.txt</a>
or copy at <a href="http://www.boost.org/LICENSE_1_0.txt">www.boost.org/LICENSE_1_0.txt</a>)</small></p>
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