1<html> 2<head> 3 <title>BOOST_PP_VARIADIC_ELEM</title> 4 <link rel="stylesheet" type="text/css" href="../styles.css"> 5</head> 6<body> 7<div style="margin-left: 0px;"> The <b>BOOST_PP_VARIADIC_ELEM</b> variadic macro 8extracts an element from <i>variadic data</i>. </div> 9<h4>Usage</h4> 10<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> 11 </div> 12<h4>Arguments</h4> 13<dl><dt>i</dt> 14 <dd> The zero-based index into the <i>variadic data</i> of the element to be 15extracted. Valid values range from <i>0</i> to the size of the variadic data - 1. 16 </dd> 17 <dt>...<br> 18</dt> 19 <dd> The <i>variadic data</i> from which an element is to be extracted. </dd> 20</dl> 21<h4>Remarks</h4> 22<div>The index <i>i</i> must be less than the size of the <i>variadic data</i>. </div> 23<h4>See Also</h4> 24<ul> 25 <li><a href="limit_variadic.html">BOOST_PP_LIMIT_VARIADIC</a></li> 26</ul> 27<h4>Requirements</h4> 28<div> <b>Header:</b> <a href="../headers/variadic/elem.html"><boost/preprocessor/variadic/elem.hpp></a> 29</div> 30<h4>Sample Code</h4> 31<div> 32<pre>#include <<a href="../headers/variadic/elem.html">boost/preprocessor/variadic/elem.hpp</a>><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> 33</div> 34<hr size="1"> 35<div style="margin-left: 0px;"> <i></i><i>� Copyright Edward Diener 2011,2013</i> </div> 36<div style="margin-left: 0px;"> 37<p><small>Distributed under the Boost Software License, Version 1.0. 38(See accompanying file <a href="../../../../LICENSE_1_0.txt">LICENSE_1_0.txt</a> 39or copy at <a href="http://www.boost.org/LICENSE_1_0.txt">www.boost.org/LICENSE_1_0.txt</a>)</small></p> 40</div> 41</body> 42</html> 43