File: comma.html

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<html>
<head>
	<title>BOOST_PP_COMMA</title>
	<link rel="stylesheet" type="text/css" href="../styles.css">
</head>
<body>
	<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.html">&lt;boost/preprocessor/punctuation/comma.hpp&gt;</a>
		</div>
	<h4>Sample Code</h4>
<div><pre>
#include &lt;<a href="../headers/control/if.html">boost/preprocessor/control/if.hpp</a>&gt;
#include &lt;<a href="../headers/facilities/empty.html">boost/preprocessor/facilities/empty.hpp</a>&gt;
#include &lt;<a href="../headers/punctuation/comma.html">boost/preprocessor/punctuation/comma.hpp</a>&gt;

<a href="if.html">BOOST_PP_IF</a>(1, <a href="comma.html">BOOST_PP_COMMA</a>, <a href="empty.html">BOOST_PP_EMPTY</a>)() // expands to ,
</pre></div>
</body>
</html>