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[SVN r15693]
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Paul Mensonides
2002-10-03 22:13:37 +00:00
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<html>
<head>
<title>BOOST_PP_CAT</title>
<link rel="stylesheet" type="text/css" href="../styles.css">
</head>
<body>
<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>Sample Code</h4>
<div><pre>
#include &lt;<a href="../headers/cat.hpp.html">boost/preprocessor/cat.hpp</a>&gt;
<a href="cat.html">BOOST_PP_CAT</a>(x, <a href="cat.html">BOOST_PP_CAT</a>(y, z)) // expands to xyz
</pre></div>
</body>
</html>