57 lines
1.9 KiB
Plaintext
57 lines
1.9 KiB
Plaintext
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#ifndef BOOST_MPL_AUX_PREPROCESSOR_TOKEN_EQUAL_HPP_INCLUDED
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#define BOOST_MPL_AUX_PREPROCESSOR_TOKEN_EQUAL_HPP_INCLUDED
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// Copyright Paul Mensonides 2003
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// Copyright Aleksey Gurtovoy 2003-2004
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//
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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//
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// See http://www.boost.org/libs/mpl for documentation.
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// $Id$
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// $Date$
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// $Revision$
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#include <boost/mpl/aux_/preprocessor/is_seq.hpp>
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#include <boost/preprocessor/if.hpp>
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#include <boost/preprocessor/logical/bitand.hpp>
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#include <boost/preprocessor/logical/compl.hpp>
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#include <boost/preprocessor/tuple/eat.hpp>
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#include <boost/preprocessor/cat.hpp>
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// compares tokens 'a' and 'b' for equality:
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//
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// #define BOOST_MPL_PP_TOKEN_EQUAL_apple(x) x
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// #define BOOST_MPL_PP_TOKEN_EQUAL_orange(x) x
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//
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// BOOST_PP_ASSERT( BOOST_PP_NOT( BOOST_MPL_PP_TOKEN_EQUAL(apple, abc) ) )
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// BOOST_PP_ASSERT( BOOST_PP_NOT( BOOST_MPL_PP_TOKEN_EQUAL(abc, apple) ) )
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// BOOST_PP_ASSERT( BOOST_PP_NOT( BOOST_MPL_PP_TOKEN_EQUAL(apple, orange) ) )
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// BOOST_PP_ASSERT( BOOST_MPL_PP_TOKEN_EQUAL(apple, apple) )
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// BOOST_PP_ASSERT( BOOST_MPL_PP_TOKEN_EQUAL(orange, orange) )
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#define BOOST_MPL_PP_TOKEN_EQUAL(a, b) \
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BOOST_PP_IIF( \
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BOOST_PP_BITAND( \
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BOOST_MPL_PP_IS_SEQ( BOOST_PP_CAT(BOOST_MPL_PP_TOKEN_EQUAL_, a)((unused)) ) \
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, BOOST_MPL_PP_IS_SEQ( BOOST_PP_CAT(BOOST_MPL_PP_TOKEN_EQUAL_, b)((unused)) ) \
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) \
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, BOOST_MPL_PP_TOKEN_EQUAL_I \
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, 0 BOOST_PP_TUPLE_EAT(2) \
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)(a, b) \
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/**/
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#define BOOST_MPL_PP_TOKEN_EQUAL_I(a, b) \
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BOOST_PP_COMPL(BOOST_MPL_PP_IS_SEQ( \
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BOOST_MPL_PP_TOKEN_EQUAL_ ## a( \
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BOOST_MPL_PP_TOKEN_EQUAL_ ## b \
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)((unused)) \
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)) \
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/**/
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#endif // BOOST_MPL_AUX_PREPROCESSOR_TOKEN_EQUAL_HPP_INCLUDED
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