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- <html>
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- <title>BOOST_PP_IDENTITY</title>
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- The <b>BOOST_PP_IDENTITY</b> macro expands to its argument when invoked.
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- <h4>Usage</h4>
- <div class="code">
- <b>BOOST_PP_IDENTITY</b>(<i>item</i>)()
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- <h4>Arguments</h4>
- <dl>
- <dt>item</dt>
- <dd>
- The result of the expansion.
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- <h4>Remarks</h4>
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- 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.
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- <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>
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- <b>Header:</b> <a href="../headers/facilities/identity.html"><boost/preprocessor/facilities/identity.hpp></a>
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- <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>
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- <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>
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