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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>
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