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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 | // $Id$ |
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| 15 | // $Date$ |
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| 16 | // $Revision$ |
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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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| 57 | |
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