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+<html>
+<head>
+ <title>BOOST_PP_IDENTITY</title>
+ <link rel="stylesheet" type="text/css" href="../styles.css">
+</head>
+<body>
+ <div style="margin-left: 0px;">
+ The <b>BOOST_PP_IDENTITY</b> macro expands to its argument when invoked.
+ </div>
+ <h4>Usage</h4>
+ <div class="code">
+ <b>BOOST_PP_IDENTITY</b>(<i>item</i>)()
+ </div>
+ <h4>Arguments</h4>
+ <dl>
+ <dt>item</dt>
+ <dd>
+ The result of the expansion.
+ </dd>
+ </dl>
+ <h4>Remarks</h4>
+ <div>
+ This macro is designed to be used with <b>BOOST_PP_IF</b> and <b>BOOST_PP_IIF</b> when only one of the clauses needs to be invoked.
+ </div>
+ <h4>See Also</h4>
+ <ul>
+ <li><a href="if.html">BOOST_PP_IF</a></li>
+ <li><a href="iif.html">BOOST_PP_IIF</a></li>
+ </ul>
+ <h4>Requirements</h4>
+ <div>
+ <b>Header:</b> <a href="../headers/facilities/identity.html"><boost/preprocessor/facilities/identity.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>>
+#include <<a href="../headers/facilities/identity.html">boost/preprocessor/facilities/identity.hpp</a>>
+
+#define MACRO(n) <a href="if.html">BOOST_PP_IF</a>(n, <a href="identity.html">BOOST_PP_IDENTITY</a>(x), <a href="empty.html">BOOST_PP_EMPTY</a>)()
+
+MACRO(0) // expands to nothing
+MACRO(1) // expands to x
+</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>