forked from boostorg/preprocessor
45 lines
1.7 KiB
C++
45 lines
1.7 KiB
C++
#ifndef BOOST_PREPROCESSOR_ARITHMETIC_SUB_HPP
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#define BOOST_PREPROCESSOR_ARITHMETIC_SUB_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/dec.hpp>
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#include <boost/preprocessor/tuple/elem.hpp>
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#include <boost/preprocessor/while.hpp>
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/** <p>Expands to the difference of <code>X</code> and <code>Y</code>.</p>
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<p>Both <code>X</code> and <code>Y</code> must expand to integer literals
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in the range [0, BOOST_PP_LIMIT_MAG].</p>
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<p>For example, <code>BOOST_PP_SUB(4,3)</code> expands to <code>1</code> (a
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single token).</p>
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<h3>Test</h3>
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<ul>
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<li><a href="../../test/arithmetic_test.cpp">arithmetic_test.cpp</a></li>
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</ul>
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*/
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#define BOOST_PP_SUB(X,Y) BOOST_PP_SUB_D(0,X,Y)
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/** <p>Can be used inside BOOST_PP_WHILE() (see for an explanation of the D parameter).</p> */
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#define BOOST_PP_SUB_D(D,X,Y) BOOST_PP_TUPLE_ELEM(2,0,BOOST_PP_WHILE##D(BOOST_PP_SUB_C,BOOST_PP_SUB_F,(X,Y)))
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#if !defined(BOOST_NO_COMPILER_CONFIG) && defined(__MWERKS__)
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# define BOOST_PP_SUB_C(D,RC) BOOST_PP_TUPLE_ELEM(2,1,RC)
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# define BOOST_PP_SUB_F(D,RC) (BOOST_PP_DEC(BOOST_PP_TUPLE_ELEM(2,0,RC)),BOOST_PP_DEC(BOOST_PP_TUPLE_ELEM(2,1,RC)))
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#else
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# define BOOST_PP_SUB_C(D,RC) BOOST_PP_TUPLE2_ELEM1 RC
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# define BOOST_PP_SUB_F(D,RC) (BOOST_PP_DEC(BOOST_PP_TUPLE2_ELEM0 RC),BOOST_PP_DEC(BOOST_PP_TUPLE2_ELEM1 RC))
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#endif
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#endif
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