forked from boostorg/preprocessor
71 lines
2.3 KiB
HTML
71 lines
2.3 KiB
HTML
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<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
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<title>Boost.Preprocessor - Reference</title>
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<body bgcolor="#FFFFFF" link="#0000ff" vlink="#800080">
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<table border="0" cellpadding="7" cellspacing="0" width="100%" summary=
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"header">
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<tr>
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<td valign="top" width="300">
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<h3><a href="../../../../index.htm"><img height="86" width="277" alt="C++ Boost" src="../../../../c++boost.gif" border="0"></a></h3>
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</td>
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<td valign="top">
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<h1 align="center">Boost.Preprocessor</h1>
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<h2 align="center">Reference</h2>
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</td>
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</tr>
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</table>
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<hr>
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<a href="for.htm">Prev</a> <a href="if.htm">Next</a> <a href="index.htm#Macros">Macros</a> <a href="index.htm#Headers">Headers</a>
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<hr>
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<h1>#include <<a href="../../../../boost/preprocessor/identity.hpp">boost/preprocessor/identity.hpp</a>></h1>
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<hr>
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<h2><a name="BOOST_PP_IDENTITY">#define BOOST_PP_IDENTITY</a>(X)</h2>
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<p>Expands to <code>X</code> once invoked.</p>
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<p>Designed to be used with <a href="if.htm#BOOST_PP_IF">BOOST_PP_IF</a>(), when one of the clauses need to be
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invoked.</p>
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<p>For example,</p>
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<pre>
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<a href="if.htm#BOOST_PP_IF">BOOST_PP_IF</a>(1,<a href="identity.htm#BOOST_PP_IDENTITY">BOOST_PP_IDENTITY</a>(X),<a href="empty.htm#BOOST_PP_EMPTY">BOOST_PP_EMPTY</a>)<b>()</b>
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</pre>
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<p>expands to:</p>
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<pre>
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X
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</pre>
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<h3>Test</h3>
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<ul>
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<li><a href="../../test/preprocessor_test.cpp">preprocessor_test.cpp</a></li>
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</ul>
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<hr>
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<h2><a name="BOOST_PREPROCESSOR_IDENTITY">#define BOOST_PREPROCESSOR_IDENTITY</a>(X)</h2>
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<p>Obsolete. Use <a href="identity.htm#BOOST_PP_IDENTITY">BOOST_PP_IDENTITY</a>().</p>
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<hr>
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<a href="for.htm">Prev</a> <a href="if.htm">Next</a> <a href="index.htm#Macros">Macros</a> <a href="index.htm#Headers">Headers</a>
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<hr>
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<p>Revised <!--webbot bot="Timestamp" s-type="EDITED" s-format="%d %b %Y" startspan --><!--webbot bot="Timestamp" endspan i-checksum="15246" --></p>
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<p><i>© Copyright <a href="http://www.housemarque.com">Housemarque Oy</a> 2002</i></p>
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<p><i>Permission to copy, use, modify, sell and distribute this document is granted
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provided this copyright notice appears in all copies. This document is provided
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"as is" without express or implied warranty, and with no claim as to its suitability
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for any purpose.</i></p>
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</body></html>
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