forked from boostorg/preprocessor
34 lines
1.0 KiB
C++
34 lines
1.0 KiB
C++
#ifndef BOOST_PREPROCESSOR_EXPR_IF_HPP
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#define BOOST_PREPROCESSOR_EXPR_IF_HPP
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/* Copyright (C) 2002
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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/logical/bool.hpp>
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/** <p>Expands to <code>E</code> if <code>C != 0</code> and to nothing if <code>C == 0</code>.</p>
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<p>For example, <code>BOOST_PP_EXPR_IF(1,^)</code> expands to <code>^</code>.</p>
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<h3>See</h3>
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<ul>
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<li>BOOST_PP_IF()</li>
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</ul>
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*/
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#define BOOST_PP_EXPR_IF(C,E) BOOST_PP_EXPR_IF_BOOL(BOOST_PP_BOOL(C),E)
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#define BOOST_PP_EXPR_IF_BOOL(C,E) BOOST_PP_EXPR_IF_BOOL_DELAY(C,E)
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#define BOOST_PP_EXPR_IF_BOOL_DELAY(C,E) BOOST_PP_EXPR_IF_BOOL##C(E)
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#define BOOST_PP_EXPR_IF_BOOL0(E)
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#define BOOST_PP_EXPR_IF_BOOL1(E) E
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#endif
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