#ifndef BOOST_MPL_AUX_PREPROCESSOR_TOKEN_EQUAL_HPP_INCLUDED #define BOOST_MPL_AUX_PREPROCESSOR_TOKEN_EQUAL_HPP_INCLUDED // Copyright Paul Mensonides 2003 // Copyright Aleksey Gurtovoy 2003-2004 // // Distributed under the Boost Software License, Version 1.0. // (See accompanying file LICENSE_1_0.txt or copy at // http://www.boost.org/LICENSE_1_0.txt) // // See http://www.boost.org/libs/mpl for documentation. // $Id: token_equal.hpp 49267 2008-10-11 06:19:02Z agurtovoy $ // $Date: 2008-10-11 02:19:02 -0400 (Sat, 11 Oct 2008) $ // $Revision: 49267 $ #include <boost/mpl/aux_/preprocessor/is_seq.hpp> #include <boost/preprocessor/if.hpp> #include <boost/preprocessor/logical/bitand.hpp> #include <boost/preprocessor/logical/compl.hpp> #include <boost/preprocessor/tuple/eat.hpp> #include <boost/preprocessor/cat.hpp> // compares tokens 'a' and 'b' for equality: // // #define BOOST_MPL_PP_TOKEN_EQUAL_apple(x) x // #define BOOST_MPL_PP_TOKEN_EQUAL_orange(x) x // // BOOST_PP_ASSERT( BOOST_PP_NOT( BOOST_MPL_PP_TOKEN_EQUAL(apple, abc) ) ) // BOOST_PP_ASSERT( BOOST_PP_NOT( BOOST_MPL_PP_TOKEN_EQUAL(abc, apple) ) ) // BOOST_PP_ASSERT( BOOST_PP_NOT( BOOST_MPL_PP_TOKEN_EQUAL(apple, orange) ) ) // BOOST_PP_ASSERT( BOOST_MPL_PP_TOKEN_EQUAL(apple, apple) ) // BOOST_PP_ASSERT( BOOST_MPL_PP_TOKEN_EQUAL(orange, orange) ) #define BOOST_MPL_PP_TOKEN_EQUAL(a, b) \ BOOST_PP_IIF( \ BOOST_PP_BITAND( \ BOOST_MPL_PP_IS_SEQ( BOOST_PP_CAT(BOOST_MPL_PP_TOKEN_EQUAL_, a)((unused)) ) \ , BOOST_MPL_PP_IS_SEQ( BOOST_PP_CAT(BOOST_MPL_PP_TOKEN_EQUAL_, b)((unused)) ) \ ) \ , BOOST_MPL_PP_TOKEN_EQUAL_I \ , 0 BOOST_PP_TUPLE_EAT(2) \ )(a, b) \ /**/ #define BOOST_MPL_PP_TOKEN_EQUAL_I(a, b) \ BOOST_PP_COMPL(BOOST_MPL_PP_IS_SEQ( \ BOOST_MPL_PP_TOKEN_EQUAL_ ## a( \ BOOST_MPL_PP_TOKEN_EQUAL_ ## b \ )((unused)) \ )) \ /**/ #endif // BOOST_MPL_AUX_PREPROCESSOR_TOKEN_EQUAL_HPP_INCLUDED