

#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.



// $Source$

// $Date: 2004-09-02 11:41:37 -0400 (Thu, 02 Sep 2004) $

// $Revision: 24874 $



#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

