forked from boostorg/preprocessor
45 lines
1.1 KiB
C++
45 lines
1.1 KiB
C++
#ifndef BOOST_PREPROCESSOR_IDENTITY_HPP
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#define BOOST_PREPROCESSOR_IDENTITY_HPP
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/* Copyright (C) 2001
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* Housemarque Oy
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* http://www.housemarque.com
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*
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* Permission to copy, use, modify, sell and distribute this software is
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* granted provided this copyright notice appears in all copies. This
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* software is provided "as is" without express or implied warranty, and
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* with no claim as to its suitability for any purpose.
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*
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* See http://www.boost.org for most recent version.
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*/
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#include <boost/preprocessor/empty.hpp>
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/** <p>Expands to <code>X</code> once invoked.</p>
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<p>Designed to be used with BOOST_PP_IF(), 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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BOOST_PP_IF(1,BOOST_PP_IDENTITY(X),BOOST_PP_EMPTY)<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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*/
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#define BOOST_PP_IDENTITY(X) X BOOST_PP_EMPTY
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/** <p>Obsolete. Use BOOST_PP_IDENTITY().</p> */
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#define BOOST_PREPROCESSOR_IDENTITY(X) BOOST_PP_IDENTITY(X)
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#endif
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