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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_COMMA</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_COMMA</b> macro expands to a comma.
</div>
<h4>Usage</h4>
<div class="code">
<b>BOOST_PP_COMMA</b>()
</div>
<h4>Remarks</h4>
<div>
The preprocessor interprets commas as argument separators in macro invocations.&nbsp;
Because of this, commas require special handling.
</div>
<h4>Requirements</h4>
<div>
<b>Header:</b> &nbsp;<a href="../headers/punctuation/comma.hpp.html">&lt;boost/preprocessor/punctuation/comma.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/control/if.hpp&gt;
#include &lt;boost/preprocessor/facilities/empty.hpp&gt;
#include &lt;boost/preprocessor/punctuation/comma.hpp&gt;
BOOST_PP_IF(1, BOOST_PP_COMMA, BOOST_PP_EMPTY)() // expands to ,
<pre></div>
</body>
</html>