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2 | #ifndef BOOST_MPL_AUX_PREPROCESSOR_TOKEN_EQUAL_HPP_INCLUDED
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3 | #define BOOST_MPL_AUX_PREPROCESSOR_TOKEN_EQUAL_HPP_INCLUDED
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4 |
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5 | // Copyright Paul Mensonides 2003
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6 | // Copyright Aleksey Gurtovoy 2003-2004
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7 | //
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8 | // Distributed under the Boost Software License, Version 1.0.
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9 | // (See accompanying file LICENSE_1_0.txt or copy at
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10 | // http://www.boost.org/LICENSE_1_0.txt)
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11 | //
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12 | // See http://www.boost.org/libs/mpl for documentation.
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13 |
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14 | // $Source: /cvsroot/boost/boost/boost/mpl/aux_/preprocessor/token_equal.hpp,v $
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15 | // $Date: 2004/09/02 15:40:56 $
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16 | // $Revision: 1.3 $
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17 |
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18 | #include <boost/mpl/aux_/preprocessor/is_seq.hpp>
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19 |
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20 | #include <boost/preprocessor/if.hpp>
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21 | #include <boost/preprocessor/logical/bitand.hpp>
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22 | #include <boost/preprocessor/logical/compl.hpp>
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23 | #include <boost/preprocessor/tuple/eat.hpp>
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24 | #include <boost/preprocessor/cat.hpp>
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25 |
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26 | // compares tokens 'a' and 'b' for equality:
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27 | //
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28 | // #define BOOST_MPL_PP_TOKEN_EQUAL_apple(x) x
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29 | // #define BOOST_MPL_PP_TOKEN_EQUAL_orange(x) x
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30 | //
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31 | // BOOST_PP_ASSERT( BOOST_PP_NOT( BOOST_MPL_PP_TOKEN_EQUAL(apple, abc) ) )
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32 | // BOOST_PP_ASSERT( BOOST_PP_NOT( BOOST_MPL_PP_TOKEN_EQUAL(abc, apple) ) )
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33 | // BOOST_PP_ASSERT( BOOST_PP_NOT( BOOST_MPL_PP_TOKEN_EQUAL(apple, orange) ) )
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34 | // BOOST_PP_ASSERT( BOOST_MPL_PP_TOKEN_EQUAL(apple, apple) )
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35 | // BOOST_PP_ASSERT( BOOST_MPL_PP_TOKEN_EQUAL(orange, orange) )
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36 |
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37 | #define BOOST_MPL_PP_TOKEN_EQUAL(a, b) \
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38 | BOOST_PP_IIF( \
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39 | BOOST_PP_BITAND( \
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40 | BOOST_MPL_PP_IS_SEQ( BOOST_PP_CAT(BOOST_MPL_PP_TOKEN_EQUAL_, a)((unused)) ) \
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41 | , BOOST_MPL_PP_IS_SEQ( BOOST_PP_CAT(BOOST_MPL_PP_TOKEN_EQUAL_, b)((unused)) ) \
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42 | ) \
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43 | , BOOST_MPL_PP_TOKEN_EQUAL_I \
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44 | , 0 BOOST_PP_TUPLE_EAT(2) \
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45 | )(a, b) \
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46 | /**/
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47 |
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48 | #define BOOST_MPL_PP_TOKEN_EQUAL_I(a, b) \
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49 | BOOST_PP_COMPL(BOOST_MPL_PP_IS_SEQ( \
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50 | BOOST_MPL_PP_TOKEN_EQUAL_ ## a( \
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51 | BOOST_MPL_PP_TOKEN_EQUAL_ ## b \
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52 | )((unused)) \
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53 | )) \
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54 | /**/
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55 |
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56 | #endif // BOOST_MPL_AUX_PREPROCESSOR_TOKEN_EQUAL_HPP_INCLUDED
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