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[SVN r15198]
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Paul Mensonides
2002-09-08 09:40:56 +00:00
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<html>
<head>
<title>BOOST_PP_CAT</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_CAT</b> macro concatenates its arguments after they have been expanded.
</div>
<h4>Usage</h4>
<div class="code">
<b>BOOST_PP_CAT</b>(<i>a</i>, <i>b</i>)
</div>
<h4>Arguments</h4>
<dl>
<dt>a</dt>
<dd>
The left operand of the concatenation.
</dd>
<dt>b</dt>
<dd>
The right operand of the concatenation.
</dd>
</dl>
<h4>Remarks</h4>
<div>
The preprocessor token-pasting operator (<b>##</b>) prevents arguments from expanding.&nbsp;
This macro allows its arguments to expand before concatenation.
</div>
<div>
Concatenation must not result in an invocation of a macro that uses <b>BOOST_PP_CAT</b>.&nbsp;
If that happens, <b>BOOST_PP_CAT</b> will not expand the second time.
</div>
<!-- <h4>See Also</h4> -->
<h4>Requirements</h4>
<div>
<b>Header:</b> &nbsp;<a href="../headers/cat.hpp.html">&lt;boost/preprocessor/cat.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/cat.hpp&gt;
BOOST_PP_CAT(x, BOOST_PP_CAT(y, z)) // expands to xyz
<pre></div>
</body>
</html>