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Paul Mensonides
2002-09-08 09:40:56 +00:00
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<html>
<head>
<title>BOOST_PP_ARRAY_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_ARRAY_ELEM</b> macro extracts an element from a <i>array</i>.
</div>
<h4>Usage</h4>
<div class="code">
<b>BOOST_PP_ARRAY_ELEM</b>(<i>i</i>, <i>array</i>)
</div>
<h4>Arguments</h4>
<dl>
<dt>i</dt>
<dd>
The zero-based index into the <i>array</i> of the element to be extracted.&nbsp;
</dd>
<dt>array</dt>
<dd>
The <i>array</i> from which an element is to be extracted.&nbsp;
This <i>array</i> must contain at least <i>i</i> + <i>1</i> elements.
</dd>
</dl>
<h4>Requirements</h4>
<div>
<b>Header:</b> &nbsp;<a href="../headers/array/elem.hpp.html">&lt;boost/preprocessor/array/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/array/elem.hpp&gt;
#define ARRAY (4, (a, b, c, d))
BOOST_PP_ARRAY_ELEM(0, ARRAY) // expands to a
BOOST_PP_ARRAY_ELEM(3, ARRAY) // expands to d
<pre></div>
</body>
</html>