1<html> 2<head> 3 <title>BOOST_PP_COMMA</title> 4 <link rel="stylesheet" type="text/css" href="../styles.css"> 5</head> 6<body> 7 <div style="margin-left: 0px;"> 8 The <b>BOOST_PP_COMMA</b> macro expands to a comma. 9 </div> 10 <h4>Usage</h4> 11 <div class="code"> 12 <b>BOOST_PP_COMMA</b>() 13 </div> 14 <h4>Remarks</h4> 15 <div> 16 The preprocessor interprets commas as argument separators in macro invocations. 17 Because of this, commas require special handling. 18 </div> 19 <h4>Requirements</h4> 20 <div> 21 <b>Header:</b> <a href="../headers/punctuation/comma.html"><boost/preprocessor/punctuation/comma.hpp></a> 22 </div> 23 <h4>Sample Code</h4> 24<div><pre> 25#include <<a href="../headers/control/if.html">boost/preprocessor/control/if.hpp</a>> 26#include <<a href="../headers/facilities/empty.html">boost/preprocessor/facilities/empty.hpp</a>> 27#include <<a href="../headers/punctuation/comma.html">boost/preprocessor/punctuation/comma.hpp</a>> 28 29<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 , 30</pre></div> 31 <hr size="1"> 32 <div style="margin-left: 0px;"> 33 <i>� Copyright <a href="http://www.housemarque.com" target="_top">Housemarque Oy</a> 2002</i> 34 </br><i>� Copyright Paul Mensonides 2002</i> 35 </div> 36 <div style="margin-left: 0px;"> 37 <p><small>Distributed under the Boost Software License, Version 1.0. (See 38 accompanying file <a href="../../../../LICENSE_1_0.txt">LICENSE_1_0.txt</a> or 39 copy at <a href= 40 "http://www.boost.org/LICENSE_1_0.txt">www.boost.org/LICENSE_1_0.txt</a>)</small></p> 41 </div> 42</body> 43</html> 44