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<html>
<head>
<title>BOOST_PP_TUPLE_ELEM</title>
<link rel="stylesheet" type="text/css" href="../styles.css">
<script language="javascript" type="text/javascript" src="../scripts.js"></script>
</head>
<body onload="init('sample');">
<div style="margin-left: 0px;">
The <b>BOOST_PP_TUPLE_ELEM</b> macro extracts an element from a <i>tuple</i>.
</div>
<h4>Usage</h4>
<div class="code">
<b>BOOST_PP_TUPLE_ELEM</b>(<i>size</i>, <i>i</i>, <i>tuple</i>)
</div>
<h4>Arguments</h4>
<dl>
<dt>size</dt>
<dd>
The size of the <i>tuple</i>.&nbsp;
Valid <i>tuple</i> sizes range from <i>0</i> to <b>BOOST_PP_LIMIT_TUPLE</b>.&nbsp;
</dd>
<dt>i</dt>
<dd>
The zero-based index into the <i>tuple</i> of the element to be extracted.&nbsp;
Valid values range from <i>0</i> to <i>size</i> - <i>1</i>.
</dd>
<dt>tuple</dt>
<dd>
The <i>tuple</i> from which an element is to be extracted.
</dd>
</dl>
<h4>Remarks</h4>
<div>
The <i>size</i> argument must be the actual size of the <i>tuple</i>,
and <i>i</i> must be less than the size of the <i>tuple</i>.
</div>
<h4>See Also</h4>
<ul>
<li><a href="limit_tuple.html">BOOST_PP_LIMIT_TUPLE</a></li>
</ul>
<h4>Requirements</h4>
<div>
<b>Header:</b> &nbsp;<a href="../headers/tuple/elem.hpp.html">&lt;boost/preprocessor/tuple/elem.hpp&gt;</a>
</div>
<h4><a class="local" onclick="toggle('sample');" onmouseover="change(this);" onmouseout="revert(this);">Sample Code</a></h4>
<div id="sample"><pre>
#include &lt;boost/preprocessor/tuple/elem.hpp&gt;
#define TUPLE (a, b, c, d)
BOOST_PP_TUPLE_ELEM(4, 0, TUPLE) // expands to a
BOOST_PP_TUPLE_ELEM(4, 3, TUPLE) // expands to d
<pre></div>
</body>
</html>