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+<html>
+<head>
+ <title>BOOST_PP_EMPTY</title>
+ <link rel="stylesheet" type="text/css" href="../styles.css">
+
+</head>
+<body>
+ <div style="margin-left: 0px;">
+ The <b>BOOST_PP_EMPTY</b> macro is a nullary utility macro that expands to nothing.
+ </div>
+ <h4>Usage</h4>
+ <div class="code">
+ <b>BOOST_PP_EMPTY</b>()
+ </div>
+ <h4>Remarks</h4>
+ <div>
+ This macro is helps avoid inefficient macro-expansion.
+ It is primarily useful as arguments to <b>BOOST_PP_IF</b> or <b>BOOST_PP_IIF</b>.
+ </div>
+ <h4>Requirements</h4>
+ <div>
+ <b>Header:</b> <a href="../headers/facilities/empty.html"><boost/preprocessor/facilities/empty.hpp></a>
+ </div>
+ <h4>Sample Code</h4>
+<div><pre>
+#include <<a href="../headers/control/if.html">boost/preprocessor/control/if.hpp</a>>
+#include <<a href="../headers/facilities/empty.html">boost/preprocessor/facilities/empty.hpp</a>>
+
+#define X() result
+#define MACRO(c) <a href="if.html">BOOST_PP_IF</a>(c, X, <a href="empty.html">BOOST_PP_EMPTY</a>)()
+
+MACRO(0) // expands to nothing
+MACRO(1) // expands to result
+</pre></div>
+ <hr size="1">
+ <div style="margin-left: 0px;">
+ <i>© Copyright <a href="http://www.housemarque.com" target="_top">Housemarque Oy</a> 2002</i>
+ </br><i>© Copyright Paul Mensonides 2002</i>
+ </div>
+ <div style="margin-left: 0px;">
+ <p><small>Distributed under the Boost Software License, Version 1.0. (See
+ accompanying file <a href="../../../../LICENSE_1_0.txt">LICENSE_1_0.txt</a> or
+ copy at <a href=
+ "http://www.boost.org/LICENSE_1_0.txt">www.boost.org/LICENSE_1_0.txt</a>)</small></p>
+ </div>
+</body>
+</html>