1 2 #ifndef BOOST_MPL_AUX_PREPROCESSOR_TOKEN_EQUAL_HPP_INCLUDED 3 #define BOOST_MPL_AUX_PREPROCESSOR_TOKEN_EQUAL_HPP_INCLUDED 4 5 // Copyright Paul Mensonides 2003 6 // Copyright Aleksey Gurtovoy 2003-2004 7 // 8 // Distributed under the Boost Software License, Version 1.0. 9 // (See accompanying file LICENSE_1_0.txt or copy at 10 // http://www.boost.org/LICENSE_1_0.txt) 11 // 12 // See http://www.boost.org/libs/mpl for documentation. 13 14 // $Id$ 15 // $Date$ 16 // $Revision$ 17 18 #include <boost/mpl/aux_/preprocessor/is_seq.hpp> 19 20 #include <boost/preprocessor/if.hpp> 21 #include <boost/preprocessor/logical/bitand.hpp> 22 #include <boost/preprocessor/logical/compl.hpp> 23 #include <boost/preprocessor/tuple/eat.hpp> 24 #include <boost/preprocessor/cat.hpp> 25 26 // compares tokens 'a' and 'b' for equality: 27 // 28 // #define BOOST_MPL_PP_TOKEN_EQUAL_apple(x) x 29 // #define BOOST_MPL_PP_TOKEN_EQUAL_orange(x) x 30 // 31 // BOOST_PP_ASSERT( BOOST_PP_NOT( BOOST_MPL_PP_TOKEN_EQUAL(apple, abc) ) ) 32 // BOOST_PP_ASSERT( BOOST_PP_NOT( BOOST_MPL_PP_TOKEN_EQUAL(abc, apple) ) ) 33 // BOOST_PP_ASSERT( BOOST_PP_NOT( BOOST_MPL_PP_TOKEN_EQUAL(apple, orange) ) ) 34 // BOOST_PP_ASSERT( BOOST_MPL_PP_TOKEN_EQUAL(apple, apple) ) 35 // BOOST_PP_ASSERT( BOOST_MPL_PP_TOKEN_EQUAL(orange, orange) ) 36 37 #define BOOST_MPL_PP_TOKEN_EQUAL(a, b) \ 38 BOOST_PP_IIF( \ 39 BOOST_PP_BITAND( \ 40 BOOST_MPL_PP_IS_SEQ( BOOST_PP_CAT(BOOST_MPL_PP_TOKEN_EQUAL_, a)((unused)) ) \ 41 , BOOST_MPL_PP_IS_SEQ( BOOST_PP_CAT(BOOST_MPL_PP_TOKEN_EQUAL_, b)((unused)) ) \ 42 ) \ 43 , BOOST_MPL_PP_TOKEN_EQUAL_I \ 44 , 0 BOOST_PP_TUPLE_EAT(2) \ 45 )(a, b) \ 46 /**/ 47 48 #define BOOST_MPL_PP_TOKEN_EQUAL_I(a, b) \ 49 BOOST_PP_COMPL(BOOST_MPL_PP_IS_SEQ( \ 50 BOOST_MPL_PP_TOKEN_EQUAL_ ## a( \ 51 BOOST_MPL_PP_TOKEN_EQUAL_ ## b \ 52 )((unused)) \ 53 )) \ 54 /**/ 55 56 #endif // BOOST_MPL_AUX_PREPROCESSOR_TOKEN_EQUAL_HPP_INCLUDED 57