forked from boostorg/preprocessor
46 lines
1.5 KiB
C++
46 lines
1.5 KiB
C++
#ifndef BOOST_PREPROCESSOR_IF_HPP
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#define BOOST_PREPROCESSOR_IF_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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// pm: not necessary if using manual delay
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// #include <boost/preprocessor/detail/cat.hpp>
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#include <boost/preprocessor/logical/bool.hpp>
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/** <p>Expands to <code>THEN</code> if <code>COND != 0</code> and <code>ELSE</code> if
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<code>COND == 0</code>.</p>
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<p><code>COND</code> must expand to an integer literal in the range [0, BOOST_PP_LIMIT_MAG].</p>
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<p>For example, <code>BOOST_PP_IF(0,1,2)</code> expands to <code>2</code>.</p>
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<h3>See</h3>
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<ul>
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<li>BOOST_PP_EXPR_IF()</li>
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</ul>
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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_IF(COND,THEN,ELSE) BOOST_PP_IF_BOOL(BOOST_PP_BOOL(COND),THEN,ELSE) // original: BOOST_PP_DETAIL_CAT2(BOOST_PP_IF,BOOST_PP_BOOL(COND))(ELSE,THEN)
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#define BOOST_PP_IF_BOOL(COND,THEN,ELSE) BOOST_PP_IF_BOOL_DELAY(COND,THEN,ELSE)
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#define BOOST_PP_IF_BOOL_DELAY(COND,THEN,ELSE) BOOST_PP_IF##COND(THEN,ELSE)
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#define BOOST_PP_IF0(T,E) E // BOOST_PP_IF0(E,T) E
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#define BOOST_PP_IF1(T,E) T // BOOST_PP_IF1(E,T) T
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#endif
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