forked from boostorg/preprocessor
39 lines
1.3 KiB
C++
39 lines
1.3 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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// See http://www.boost.org for most recent version.
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/*! \file
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<a href="../../../../boost/preprocessor/arithmetic/sub.hpp">Click here to see the header.</a>
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*/
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#include <boost/preprocessor/dec.hpp>
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#include <boost/preprocessor/tuple.hpp>
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#include <boost/preprocessor/while.hpp>
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//! Expands to the difference of X and Y.
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/*!
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For example, BOOST_PP_SUB(4,3) expands to 1 (a single token).
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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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#ifndef DOXYGEN_SHOULD_SKIP_THIS
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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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#define BOOST_PP_SUB_C(D,P) BOOST_PP_TUPLE_ELEM(2,1,P)
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#define BOOST_PP_SUB_F(D,P) (BOOST_PP_DEC(BOOST_PP_TUPLE_ELEM(2,0,P)),BOOST_PP_DEC(BOOST_PP_TUPLE_ELEM(2,1,P)))
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#endif
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//! Obsolete. Use BOOST_PP_SUB(X,Y).
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#define BOOST_PREPROCESSOR_SUB(X,Y) BOOST_PP_SUB(X,Y)
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#endif
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