// Copyright Daniel Wallin 2006. Use, modification and distribution is

// subject to 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)

#ifndef BOOST_PARAMETER_PREPROCESSOR_060206_HPP

# define BOOST_PARAMETER_PREPROCESSOR_060206_HPP

# include <boost/parameter/parameters.hpp>

# include <boost/parameter/binding.hpp>

# include <boost/parameter/match.hpp>

# include <boost/parameter/aux_/parenthesized_type.hpp>

# include <boost/parameter/aux_/cast.hpp>

# include <boost/parameter/aux_/preprocessor/flatten.hpp>

# include <boost/preprocessor/repetition/repeat_from_to.hpp>

# include <boost/preprocessor/control/if.hpp>

# include <boost/preprocessor/control/expr_if.hpp>

# include <boost/preprocessor/repetition/enum_params.hpp>

# include <boost/preprocessor/repetition/enum_binary_params.hpp>

# include <boost/preprocessor/repetition/enum_trailing.hpp>

# include <boost/preprocessor/seq/first_n.hpp>

# include <boost/preprocessor/seq/for_each_product.hpp>

# include <boost/preprocessor/seq/for_each_i.hpp> 

# include <boost/preprocessor/tuple/elem.hpp> 

# include <boost/preprocessor/seq/fold_left.hpp>

# include <boost/preprocessor/seq/size.hpp>

# include <boost/preprocessor/seq/enum.hpp>

# include <boost/preprocessor/detail/is_nullary.hpp>

# include <boost/mpl/always.hpp>

# include <boost/mpl/apply_wrap.hpp>

# if BOOST_WORKAROUND(BOOST_MSVC, <= 1300)

#  include <boost/type.hpp>

# endif

namespace boost { namespace parameter { namespace aux {

#  ifndef BOOST_NO_SFINAE

// Given Match, which is "void x" where x is an argument matching

// criterion, extract a corresponding MPL predicate.

template <class Match>

struct unwrap_predicate;

// Match anything

template <>

struct unwrap_predicate<void*>

{

    typedef mpl::always<mpl::true_> type;

};

#if BOOST_WORKAROUND(__SUNPRO_CC, BOOST_TESTED_AT(0x580))

typedef void* voidstar;

// A matching predicate is explicitly specified

template <class Predicate>

struct unwrap_predicate<voidstar (Predicate)>

{

    typedef Predicate type;

};

#else

// A matching predicate is explicitly specified

template <class Predicate>

struct unwrap_predicate<void *(Predicate)>

{

    typedef Predicate type;

};

#endif 

// A type to which the argument is supposed to be convertible is

// specified

template <class Target>

struct unwrap_predicate<void (Target)>

{

    typedef is_convertible<mpl::_, Target> type;

};

// Recast the ParameterSpec's nested match metafunction as a free metafunction

template <

    class Parameters

  , BOOST_PP_ENUM_BINARY_PARAMS(

        BOOST_PARAMETER_MAX_ARITY, class A, = boost::parameter::void_ BOOST_PP_INTERCEPT

    )

>

struct match

  : Parameters::template match<

        BOOST_PP_ENUM_PARAMS(BOOST_PARAMETER_MAX_ARITY, A)

    >

{};

# endif 

# if BOOST_WORKAROUND(BOOST_MSVC, == 1300)

// Function template argument deduction does many of the same things

// as type matching during partial specialization, so we call a

// function template to "store" T into the type memory addressed by

// void(*)(T).

template <class T>

msvc_store_type<T,void*(*)(void**(T))>

msvc_store_predicate_type(void*(*)(void**(T)));

template <class T>

msvc_store_type<boost::is_convertible<mpl::_,T>,void*(*)(void*(T))>

msvc_store_predicate_type(void*(*)(void*(T)));

template <class FunctionType>

struct unwrap_predicate

{

    static FunctionType f;

    // We don't want the function to be evaluated, just instantiated,

    // so protect it inside of sizeof.

    enum { dummy = sizeof(msvc_store_predicate_type(f)) };

    // Now pull the type out of the instantiated base class

    typedef typename msvc_type_memory<FunctionType>::storage::type type;

};

template <>

struct unwrap_predicate<void*(*)(void**)>

{

    typedef mpl::always<mpl::true_> type;

};

# endif

# undef false_

template <

    class Parameters

  , BOOST_PP_ENUM_BINARY_PARAMS(

        BOOST_PARAMETER_MAX_ARITY, class A, = boost::parameter::void_ BOOST_PP_INTERCEPT

    )

>

struct argument_pack

{

    typedef typename make_arg_list<

        typename BOOST_PARAMETER_build_arg_list(

            BOOST_PARAMETER_MAX_ARITY, make_items, typename Parameters::parameter_spec, A

        )::type

      , typename Parameters::deduced_list

      , tag_keyword_arg

      , mpl::false_

    >::type type;

};

# if 1 //BOOST_WORKAROUND(BOOST_MSVC, < 1300)

// Works around VC6 problem where it won't accept rvalues.

template <class T>

T& as_lvalue(T& value, long)

{

    return value;

}

template <class T>

T const& as_lvalue(T const& value, int)

{

    return value;

}

# endif

# if BOOST_WORKAROUND(BOOST_MSVC, < 1300) \

  || BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x564))

template <class Predicate, class T, class Args>

struct apply_predicate

{

    BOOST_MPL_ASSERT((

        mpl::and_<mpl::false_,T>

    ));

    typedef typename mpl::if_<

        typename mpl::apply2<Predicate,T,Args>::type

      , char

      , int

    >::type type;

};

template <class P>

struct funptr_predicate

{

    static P p;

    template <class T, class Args, class P0>

    static typename apply_predicate<P0,T,Args>::type

    check_predicate(type<T>, Args*, void**(*)(P0));

    template <class T, class Args, class P0>

    static typename mpl::if_<

        is_convertible<T,P0>

      , char

      , int

     >::type check_predicate(type<T>, Args*, void*(*)(P0));

    template <class T, class Args>

    struct apply

    {

        BOOST_STATIC_CONSTANT(bool, result = 

            sizeof(check_predicate(boost::type<T>(), (Args*)0, &p)) == 1

        );

        typedef mpl::bool_<apply<T,Args>::result> type;

    };

};

template <>

struct funptr_predicate<void**>

  : mpl::always<mpl::true_>

{};

# endif

}}} // namespace boost::parameter::aux

# if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x564))

// From Paul Mensonides

#  define BOOST_PARAMETER_IS_NULLARY(x) \

    BOOST_PP_SPLIT(1, BOOST_PARAMETER_IS_NULLARY_C x BOOST_PP_COMMA() 0) \

    /**/

#  define BOOST_PARAMETER_IS_NULLARY_C() \

    ~, 1 BOOST_PP_RPAREN() \

    BOOST_PP_TUPLE_EAT(2) BOOST_PP_LPAREN() ~ \

    /**/

# else

#  define BOOST_PARAMETER_IS_NULLARY(x) BOOST_PP_IS_NULLARY(x)

# endif

# define BOOST_PARAMETER_MEMBER_FUNCTION_CHECK_STATIC_static ()

# define BOOST_PARAMETER_MEMBER_FUNCTION_IS_STATIC(name) \

    BOOST_PARAMETER_IS_NULLARY( \

        BOOST_PP_CAT(BOOST_PARAMETER_MEMBER_FUNCTION_CHECK_STATIC_,name) \

    )

# if !defined(BOOST_MSVC)

#  define BOOST_PARAMETER_MEMBER_FUNCTION_STRIP_STATIC_static

#  define BOOST_PARAMETER_MEMBER_FUNCTION_STRIP_STATIC(name) \

    BOOST_PP_CAT(BOOST_PARAMETER_MEMBER_FUNCTION_STRIP_STATIC_, name)

# else

// Workaround for MSVC preprocessor.

//

// When stripping static from "static f", msvc will produce

// " f". The leading whitespace doesn't go away when pasting

// the token with something else, so this thing is a hack to

// strip the whitespace.

#  define BOOST_PARAMETER_MEMBER_FUNCTION_STRIP_STATIC_static (

#  define BOOST_PARAMETER_MEMBER_FUNCTION_STRIP_STATIC_AUX(name) \

    BOOST_PP_CAT(BOOST_PARAMETER_MEMBER_FUNCTION_STRIP_STATIC_, name))

#  define BOOST_PARAMETER_MEMBER_FUNCTION_STRIP_STATIC(name) \

    BOOST_PP_SEQ_HEAD( \

        BOOST_PARAMETER_MEMBER_FUNCTION_STRIP_STATIC_AUX(name) \

    )

# endif

# define BOOST_PARAMETER_MEMBER_FUNCTION_STATIC(name) \

    BOOST_PP_EXPR_IF( \

        BOOST_PARAMETER_MEMBER_FUNCTION_IS_STATIC(name) \

      , static \

    )

# define BOOST_PARAMETER_MEMBER_FUNCTION_NAME(name) \

    BOOST_PP_IF( \

        BOOST_PARAMETER_MEMBER_FUNCTION_IS_STATIC(name) \

      , BOOST_PARAMETER_MEMBER_FUNCTION_STRIP_STATIC \

      , name BOOST_PP_TUPLE_EAT(1) \

    )(name)

// Calculates [begin, end) arity range.

# define BOOST_PARAMETER_ARITY_RANGE_M_optional(state) state

# define BOOST_PARAMETER_ARITY_RANGE_M_deduced_optional(state) state

# define BOOST_PARAMETER_ARITY_RANGE_M_required(state) BOOST_PP_INC(state)

# define BOOST_PARAMETER_ARITY_RANGE_M_deduced_required(state) BOOST_PP_INC(state)

# define BOOST_PARAMETER_ARITY_RANGE_M(s, state, x) \

    BOOST_PP_CAT( \

        BOOST_PARAMETER_ARITY_RANGE_M_ \

      , BOOST_PARAMETER_FN_ARG_QUALIFIER(x) \

    )(state)

/**/

# define BOOST_PARAMETER_ARITY_RANGE(args) \

    ( \

        BOOST_PP_SEQ_FOLD_LEFT(BOOST_PARAMETER_ARITY_RANGE_M, 0, args) \

      , BOOST_PP_INC(BOOST_PP_SEQ_SIZE(args)) \

    )

/**/

// Accessor macros for the argument specs tuple.

# define BOOST_PARAMETER_FN_ARG_QUALIFIER(x) \

    BOOST_PP_TUPLE_ELEM(4,0,x)

/**/

# define BOOST_PARAMETER_FN_ARG_NAME(x) \

    BOOST_PP_TUPLE_ELEM(4,1,x)

/**/

# define BOOST_PARAMETER_FN_ARG_PRED(x) \

    BOOST_PP_TUPLE_ELEM(4,2,x)

/**/

# define BOOST_PARAMETER_FN_ARG_DEFAULT(x) \

    BOOST_PP_TUPLE_ELEM(4,3,x)

/**/

# define BOOST_PARAMETETER_FUNCTION_EAT_KEYWORD_QUALIFIER_out(x)

# define BOOST_PARAMETETER_FUNCTION_EAT_KEYWORD_QUALIFIER_in_out(x)

// Returns 1 if x is either "out(k)" or "in_out(k)".

# define BOOST_PARAMETER_FUNCTION_IS_KEYWORD_QUALIFIER(x) \

    BOOST_PP_IS_EMPTY( \

        BOOST_PP_CAT(BOOST_PARAMETETER_FUNCTION_EAT_KEYWORD_QUALIFIER_, x) \

    ) \

/**/

# define BOOST_PARAMETETER_FUNCTION_GET_KEYWORD_QUALIFIER_out(x) x

# define BOOST_PARAMETETER_FUNCTION_GET_KEYWORD_QUALIFIER_in_out(x) x

# define BOOST_PARAMETER_FUNCTION_KEYWORD_GET(x) \

    BOOST_PP_CAT(BOOST_PARAMETETER_FUNCTION_GET_KEYWORD_QUALIFIER_, x)

/**/

// Returns the keyword of x, where x is either a keyword qualifier

// or a keyword.

//

//   k => k

//   out(k) => k

//   in_out(k) => k

//

# define BOOST_PARAMETER_FUNCTION_KEYWORD(x) \

    BOOST_PP_IF( \

        BOOST_PARAMETER_FUNCTION_IS_KEYWORD_QUALIFIER(x) \

      , BOOST_PARAMETER_FUNCTION_KEYWORD_GET \

      , x BOOST_PP_TUPLE_EAT(1) \

    )(x)

/**/

# define BOOST_PARAMETER_FN_ARG_KEYWORD(x) \

    BOOST_PARAMETER_FUNCTION_KEYWORD( \

        BOOST_PARAMETER_FN_ARG_NAME(x) \

    )

// Builds forwarding functions.

# define BOOST_PARAMETER_FUNCTION_FWD_FUNCTION_TEMPLATE_Z(z, n) \

    template<BOOST_PP_ENUM_PARAMS_Z(z, n, class ParameterArgumentType)>

/**/

# ifndef BOOST_NO_SFINAE

#  define BOOST_PARAMETER_FUNCTION_FWD_MATCH_Z(z, name, parameters, n) \

    , typename boost::parameter::aux::match< \

          parameters, BOOST_PP_ENUM_PARAMS(n, ParameterArgumentType) \

      >::type boost_parameter_enabler_argument = parameters()

# else

#  define BOOST_PARAMETER_FUNCTION_FWD_MATCH_Z(z, name, parameters, n)

# endif

/**/

# define BOOST_PARAMETER_FUNCTION_PARAMETERS_NAME(base) \

    BOOST_PP_CAT( \

        boost_param_parameters_ \

      , BOOST_PP_CAT(__LINE__, BOOST_PARAMETER_MEMBER_FUNCTION_NAME(base)) \

    )

// Produce a name for a result type metafunction for the function

// named base

# define BOOST_PARAMETER_FUNCTION_RESULT_NAME(base) \

    BOOST_PP_CAT( \

        boost_param_result_ \

      , BOOST_PP_CAT(__LINE__,BOOST_PARAMETER_MEMBER_FUNCTION_NAME(base)) \

    )

// Can't do boost_param_impl_ ## basee because base might start with an underscore

// daniel: what? how is that relevant? the reason for using CAT() is to make sure

// base is expanded. i'm not sure we need to here, but it's more stable to do it.

# define BOOST_PARAMETER_IMPL(base) \

    BOOST_PP_CAT(boost_param_impl,BOOST_PARAMETER_MEMBER_FUNCTION_NAME(base))

# define BOOST_PARAMETER_FUNCTION_FWD_FUNCTION00(z, n, r, data, elem) \

    BOOST_PP_IF( \

        n \

      , BOOST_PARAMETER_FUNCTION_FWD_FUNCTION_TEMPLATE_Z, BOOST_PP_TUPLE_EAT(2) \

    )(z,n) \

    BOOST_PARAMETER_MEMBER_FUNCTION_STATIC(BOOST_PP_TUPLE_ELEM(7,3,data)) \

    inline \

    BOOST_PP_EXPR_IF(n, typename) \

        BOOST_PARAMETER_FUNCTION_RESULT_NAME(BOOST_PP_TUPLE_ELEM(7,3,data))<   \

        BOOST_PP_EXPR_IF(n, typename) \

        boost::parameter::aux::argument_pack< \

            BOOST_PARAMETER_FUNCTION_PARAMETERS_NAME(BOOST_PP_TUPLE_ELEM(7,3,data)) \

            BOOST_PP_COMMA_IF(n) \

            BOOST_PP_IF( \

                n, BOOST_PP_SEQ_ENUM, BOOST_PP_TUPLE_EAT(1) \

            )(elem) \

        >::type \

    >::type \

    BOOST_PARAMETER_MEMBER_FUNCTION_NAME(BOOST_PP_TUPLE_ELEM(7,3,data))( \

        BOOST_PP_IF( \

            n \

          , BOOST_PP_SEQ_FOR_EACH_I_R \

          , BOOST_PP_TUPLE_EAT(4) \

        )( \

            r \

          , BOOST_PARAMETER_FUNCTION_ARGUMENT \

          , ~ \

          , elem \

        ) \

        BOOST_PP_IF(n, BOOST_PARAMETER_FUNCTION_FWD_MATCH_Z, BOOST_PP_TUPLE_EAT(4))( \

            z \

          , BOOST_PP_TUPLE_ELEM(7,3,data) \

          , BOOST_PARAMETER_FUNCTION_PARAMETERS_NAME(BOOST_PP_TUPLE_ELEM(7,3,data)) \

          , n \

        ) \

    ) BOOST_PP_EXPR_IF(BOOST_PP_TUPLE_ELEM(7,4,data), const) \

    { \

        return BOOST_PARAMETER_IMPL(BOOST_PP_TUPLE_ELEM(7,3,data))( \

            BOOST_PARAMETER_FUNCTION_PARAMETERS_NAME(BOOST_PP_TUPLE_ELEM(7,3,data))()( \

                BOOST_PP_ENUM_PARAMS_Z(z, n, a) \

            ) \

        ); \

    }

/**/

# define BOOST_PARAMETER_FUNCTION_FWD_FUNCTION0(r, data, elem) \

    BOOST_PARAMETER_FUNCTION_FWD_FUNCTION00( \

        BOOST_PP_TUPLE_ELEM(7,0,data) \

      , BOOST_PP_TUPLE_ELEM(7,1,data) \

      , r \

      , data \

      , elem \

    )

/**/

# define BOOST_PARAMETER_FUNCTION_FWD_FUNCTION_ARITY_0(z, n, data) \

    BOOST_PARAMETER_FUNCTION_FWD_FUNCTION00( \

        z, n, BOOST_PP_DEDUCE_R() \

      , (z, n, BOOST_PP_TUPLE_REM(5) data) \

      , ~ \

    )

/**/

# define BOOST_PARAMETER_FUNCTION_FWD_FUNCTION_ARITY_N(z, n, data) \

    BOOST_PP_SEQ_FOR_EACH( \

        BOOST_PARAMETER_FUNCTION_FWD_FUNCTION0 \

      , (z, n, BOOST_PP_TUPLE_REM(5) data) \

      , BOOST_PP_SEQ_FOR_EACH_PRODUCT( \

            BOOST_PARAMETER_FUNCTION_FWD_PRODUCT \

          , BOOST_PP_SEQ_FIRST_N( \

                n, BOOST_PP_TUPLE_ELEM(5,3,data) \

            ) \

        ) \

    )

/**/

# define BOOST_PARAMETER_FUNCTION_FWD_FUNCTION(z, n, data) \

    BOOST_PP_IF( \

        n \

      , BOOST_PARAMETER_FUNCTION_FWD_FUNCTION_ARITY_N \

      , BOOST_PARAMETER_FUNCTION_FWD_FUNCTION_ARITY_0 \

    )(z,n,data) \

/**/

# define BOOST_PARAMETER_FUNCTION_FWD_FUNCTIONS0( \

    result,name,args,const_,combinations,range \

) \

    BOOST_PP_REPEAT_FROM_TO( \

        BOOST_PP_TUPLE_ELEM(2,0,range), BOOST_PP_TUPLE_ELEM(2,1,range) \

      , BOOST_PARAMETER_FUNCTION_FWD_FUNCTION \

      , (result,name,const_,combinations,BOOST_PP_TUPLE_ELEM(2,1,range)) \

    )

/**/

# define BOOST_PARAMETER_FUNCTION_FWD_FUNCTIONS(result,name,args, const_, combinations) \

    BOOST_PARAMETER_FUNCTION_FWD_FUNCTIONS0( \

        result, name, args, const_, combinations, BOOST_PARAMETER_ARITY_RANGE(args) \

    )

/**/

// Builds boost::parameter::parameters<> specialization

#  define BOOST_PARAMETER_FUNCTION_PARAMETERS_QUALIFIER_optional(tag) \

    optional<tag

#  define BOOST_PARAMETER_FUNCTION_PARAMETERS_QUALIFIER_required(tag) \

    required<tag

#  define BOOST_PARAMETER_FUNCTION_PARAMETERS_QUALIFIER_deduced_optional(tag) \

    optional<boost::parameter::deduced<tag>

#  define BOOST_PARAMETER_FUNCTION_PARAMETERS_QUALIFIER_deduced_required(tag) \

    required<boost::parameter::deduced<tag>

# if !BOOST_WORKAROUND(BOOST_MSVC, < 1300) && !BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x564))

#  if BOOST_WORKAROUND(BOOST_MSVC, == 1300)

#   define BOOST_PARAMETER_PREDICATE_TYPE(p) void*(*) (void* p)

#  else

#   define BOOST_PARAMETER_PREDICATE_TYPE(p) void p

#  endif

#  define BOOST_PARAMETER_FUNCTION_PARAMETERS_M(r,tag_namespace,i,elem) \

    BOOST_PP_COMMA_IF(i) \

    boost::parameter::BOOST_PP_CAT( \

        BOOST_PARAMETER_FUNCTION_PARAMETERS_QUALIFIER_ \

      , BOOST_PARAMETER_FN_ARG_QUALIFIER(elem) \

    )( \

        tag_namespace::BOOST_PARAMETER_FUNCTION_KEYWORD( \

            BOOST_PARAMETER_FN_ARG_KEYWORD(elem) \

        ) \

    ) \

      , typename boost::parameter::aux::unwrap_predicate< \

            BOOST_PARAMETER_PREDICATE_TYPE(BOOST_PARAMETER_FN_ARG_PRED(elem)) \

        >::type \

    >

# elif BOOST_WORKAROUND(BOOST_MSVC, < 1300)

#  define BOOST_PARAMETER_FUNCTION_PARAMETERS_M(r,tag_namespace,i,elem) \

    BOOST_PP_COMMA_IF(i) \

    boost::parameter::BOOST_PP_CAT( \

        BOOST_PARAMETER_FUNCTION_PARAMETERS_QUALIFIER_ \

      , BOOST_PARAMETER_FN_ARG_QUALIFIER(elem) \

    )( \

        tag_namespace::BOOST_PARAMETER_FUNCTION_KEYWORD( \

            BOOST_PARAMETER_FN_ARG_KEYWORD(elem) \

        ) \

    ) \

      , boost::parameter::aux::funptr_predicate< \

            void* BOOST_PARAMETER_FN_ARG_PRED(elem) \

        > \

    >

# elif BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x564))

#  define BOOST_PARAMETER_FUNCTION_PARAMETERS_M(r,tag_namespace,i,elem) \

    BOOST_PP_COMMA_IF(i) \

    boost::parameter::BOOST_PP_CAT( \

        BOOST_PARAMETER_FUNCTION_PARAMETERS_QUALIFIER_ \

      , BOOST_PARAMETER_FN_ARG_QUALIFIER(elem) \

    )( \

        tag_namespace::BOOST_PARAMETER_FUNCTION_KEYWORD( \

            BOOST_PARAMETER_FN_ARG_KEYWORD(elem) \

        ) \

    ) \

      , boost::mpl::always<boost::mpl::true_> \

    >

# endif

# define BOOST_PARAMETER_FUNCTION_PARAMETERS(tag_namespace, base, args)             \

    template <class BoostParameterDummy>                                            \

    struct BOOST_PP_CAT(                                                            \

            BOOST_PP_CAT(boost_param_params_, __LINE__)                             \

          , BOOST_PARAMETER_MEMBER_FUNCTION_NAME(base)                              \

    ) : boost::parameter::parameters<                                               \

            BOOST_PP_SEQ_FOR_EACH_I(                                                \

                BOOST_PARAMETER_FUNCTION_PARAMETERS_M, tag_namespace, args          \

            )                                                                       \

        >                                                                           \

    {};                                                                             \

                                                                                    \

    typedef BOOST_PP_CAT( \

            BOOST_PP_CAT(boost_param_params_, __LINE__) \

          , BOOST_PARAMETER_MEMBER_FUNCTION_NAME(base) \

    )<int>

// Defines result type metafunction

# define BOOST_PARAMETER_FUNCTION_RESULT_ARG(z, _, i, x) \

    BOOST_PP_COMMA_IF(i) class BOOST_PP_TUPLE_ELEM(3,1,x)

/**/

# define BOOST_PARAMETER_FUNCTION_RESULT_(result, name, args)                                   \

    template <class Args>                                                                       \

    struct BOOST_PARAMETER_FUNCTION_RESULT_NAME(name)                                           \

    {                                                                                           \

        typedef typename BOOST_PARAMETER_PARENTHESIZED_TYPE(result) type;                       \

    };

# if BOOST_WORKAROUND(BOOST_MSVC, <= 1300)

#  define BOOST_PARAMETER_FUNCTION_RESULT(result, name, args)  \

    BOOST_PARAMETER_FUNCTION_RESULT_(result, name, args)        \

    template <>                                                 \

    struct BOOST_PARAMETER_FUNCTION_RESULT_NAME(name)<int>      \

    { typedef int type; };

# else

#  define BOOST_PARAMETER_FUNCTION_RESULT(result, name, args)  \

    BOOST_PARAMETER_FUNCTION_RESULT_(result, name, args)

# endif

// Defines implementation function

# define BOOST_PARAMETER_FUNCTION_IMPL_HEAD(name)           \

    template <class Args>                                   \

    typename BOOST_PARAMETER_FUNCTION_RESULT_NAME(name)<    \

       Args                                                 \

    >::type BOOST_PARAMETER_IMPL(name)(Args const& args)

# define BOOST_PARAMETER_FUNCTION_IMPL_FWD(name) \

    BOOST_PARAMETER_FUNCTION_IMPL_HEAD(name);

/**/

# define BOOST_PARAMETER_FUNCTION_SPLIT_ARG_required(state, arg) \

    ( \

        BOOST_PP_INC(BOOST_PP_TUPLE_ELEM(4, 0, state)) \

      , BOOST_PP_SEQ_PUSH_BACK(BOOST_PP_TUPLE_ELEM(4, 1, state), arg) \

      , BOOST_PP_TUPLE_ELEM(4, 2, state) \

      , BOOST_PP_TUPLE_ELEM(4, 3, state) \

    )

# define BOOST_PARAMETER_FUNCTION_SPLIT_ARG_deduced_required(state, arg) \

    BOOST_PARAMETER_FUNCTION_SPLIT_ARG_required(state, arg)

# define BOOST_PARAMETER_FUNCTION_SPLIT_ARG_optional(state, arg) \

    ( \

        BOOST_PP_TUPLE_ELEM(4, 0, state) \

      , BOOST_PP_TUPLE_ELEM(4, 1, state) \

      , BOOST_PP_INC(BOOST_PP_TUPLE_ELEM(4, 2, state)) \

      , BOOST_PP_SEQ_PUSH_BACK(BOOST_PP_TUPLE_ELEM(4, 3, state), arg) \

    )

# define BOOST_PARAMETER_FUNCTION_SPLIT_ARG_deduced_optional(state, arg) \

    BOOST_PARAMETER_FUNCTION_SPLIT_ARG_optional(state, arg)

# define BOOST_PARAMETER_FUNCTION_SPLIT_ARG(s, state, arg) \

    BOOST_PP_CAT( \

        BOOST_PARAMETER_FUNCTION_SPLIT_ARG_ \

      , BOOST_PARAMETER_FN_ARG_QUALIFIER(arg) \

    )(state, arg)

// Returns (required_count, required, optional_count, optionals) tuple

# define BOOST_PARAMETER_FUNCTION_SPLIT_ARGS(args) \

    BOOST_PP_SEQ_FOLD_LEFT( \

        BOOST_PARAMETER_FUNCTION_SPLIT_ARG \

      , (0,BOOST_PP_SEQ_NIL, 0,BOOST_PP_SEQ_NIL) \

      , args \

    )

# define BOOST_PARAMETER_FUNCTION_DEFAULT_FUNCTION_ARG_NAME(keyword) \

    BOOST_PP_CAT(BOOST_PP_CAT(keyword,_),type)

// Helpers used as parameters to BOOST_PARAMETER_FUNCTION_DEFAULT_ARGUMENTS.

# define BOOST_PARAMETER_FUNCTION_DEFAULT_FUNCTION_TEMPLATE_ARG(r, _, arg) \

    , class BOOST_PARAMETER_FUNCTION_DEFAULT_FUNCTION_ARG_NAME( \

              BOOST_PARAMETER_FN_ARG_KEYWORD(arg) \

      )

# define BOOST_PARAMETER_FUNCTION_DEFAULT_FUNCTION_ARG(r, _, arg) \

    , BOOST_PARAMETER_FUNCTION_DEFAULT_FUNCTION_ARG_NAME( \

              BOOST_PARAMETER_FN_ARG_KEYWORD(arg) \

      )& BOOST_PARAMETER_FN_ARG_KEYWORD(arg)

# define BOOST_PARAMETER_FUNCTION_DEFAULT_FUNCTION_PARAMETER(r, _, arg) \

    , BOOST_PARAMETER_FN_ARG_KEYWORD(arg)

// Produces a name for the dispatch functions.

# define BOOST_PARAMETER_FUNCTION_DEFAULT_NAME(name) \

    BOOST_PP_CAT( \

        boost_param_default_ \

      , BOOST_PP_CAT(__LINE__, BOOST_PARAMETER_MEMBER_FUNCTION_NAME(name)) \

    )

// Helper macro used below to produce lists based on the keyword argument

// names. macro is applied to every element. n is the number of

// optional arguments that should be included.

# define BOOST_PARAMETER_FUNCTION_DEFAULT_ARGUMENTS(macro, n, split_args) \

    BOOST_PP_SEQ_FOR_EACH( \

        macro \

      , ~ \

      , BOOST_PP_TUPLE_ELEM(4,1,split_args) \

    ) \

    BOOST_PP_SEQ_FOR_EACH( \

        macro \

      , ~ \

      , BOOST_PP_SEQ_FIRST_N( \

          BOOST_PP_SUB(BOOST_PP_TUPLE_ELEM(4,2,split_args), n) \

        , BOOST_PP_TUPLE_ELEM(4,3,split_args) \

        ) \

    )

// Generates a keyword | default expression.

# define BOOST_PARAMETER_FUNCTION_DEFAULT_EVAL_DEFAULT(arg, tag_namespace) \

    boost::parameter::keyword< \

        tag_namespace::BOOST_PARAMETER_FN_ARG_KEYWORD(arg) \

    >::get() | boost::parameter::aux::use_default_tag()

# define BOOST_PARAMETER_FUNCTION_DEFAULT_FUNCTION_GET_ARG(arg, tag_ns) \

    BOOST_PARAMETER_FUNCTION_CAST( \

        args[ \

            BOOST_PARAMETER_FUNCTION_DEFAULT_EVAL_DEFAULT( \

                arg, tag_ns \

            ) \

        ] \

      , BOOST_PARAMETER_FN_ARG_PRED(arg) \

    )

# define BOOST_PARAMETER_FUNCTION_DEFAULT_FUNCTION_BODY(name, n, split_args, tag_namespace) \

    { \

        return BOOST_PARAMETER_FUNCTION_DEFAULT_NAME(name)( \

            (ResultType(*)())0 \

          , args \

          , 0L \

            BOOST_PARAMETER_FUNCTION_DEFAULT_ARGUMENTS( \

                BOOST_PARAMETER_FUNCTION_DEFAULT_FUNCTION_PARAMETER \

              , n \

              , split_args \

            ) \

          , BOOST_PARAMETER_FUNCTION_DEFAULT_FUNCTION_GET_ARG( \

                BOOST_PP_SEQ_ELEM( \

                    BOOST_PP_SUB(BOOST_PP_TUPLE_ELEM(4,2,split_args), n) \

                  , BOOST_PP_TUPLE_ELEM(4,3,split_args) \

                ) \

              , tag_namespace \

            ) \

        ); \

    }

# define BOOST_PARAMETER_FUNCTION_DEFAULT_EVAL_ACTUAL_DEFAULT(arg) \

    BOOST_PARAMETER_FUNCTION_CAST( \

        boost::parameter::aux::as_lvalue(BOOST_PARAMETER_FN_ARG_DEFAULT(arg), 0L) \

      , BOOST_PARAMETER_FN_ARG_PRED(arg) \

    )

# define BOOST_PARAMETER_FUNCTION_DEFAULT_EVAL_DEFAULT_BODY(name, n, split_args, tag_ns, const_) \

    template < \

        class ResultType \

      , class Args \

        BOOST_PARAMETER_FUNCTION_DEFAULT_ARGUMENTS( \

            BOOST_PARAMETER_FUNCTION_DEFAULT_FUNCTION_TEMPLATE_ARG \

          , BOOST_PP_INC(n) \

          , split_args \

        ) \

    > \

    BOOST_PARAMETER_MEMBER_FUNCTION_STATIC(name) \

    ResultType BOOST_PARAMETER_FUNCTION_DEFAULT_NAME(name)( \

        ResultType(*)() \

      , Args const& args \

      , long \

        BOOST_PARAMETER_FUNCTION_DEFAULT_ARGUMENTS( \

            BOOST_PARAMETER_FUNCTION_DEFAULT_FUNCTION_ARG \

          , BOOST_PP_INC(n) \

          , split_args \

        ) \

      , boost::parameter::aux::use_default_tag \

    ) BOOST_PP_EXPR_IF(const_, const) \

    { \

        return BOOST_PARAMETER_FUNCTION_DEFAULT_NAME(name)( \

            (ResultType(*)())0 \

          , args \

          , 0L \

            BOOST_PARAMETER_FUNCTION_DEFAULT_ARGUMENTS( \

                BOOST_PARAMETER_FUNCTION_DEFAULT_FUNCTION_PARAMETER \

              , BOOST_PP_INC(n) \

              , split_args \

            ) \

          , BOOST_PARAMETER_FUNCTION_DEFAULT_EVAL_ACTUAL_DEFAULT( \

                BOOST_PP_SEQ_ELEM( \

                    BOOST_PP_SUB(BOOST_PP_TUPLE_ELEM(4,2,split_args), BOOST_PP_INC(n)) \

                  , BOOST_PP_TUPLE_ELEM(4,3,split_args) \

                ) \

            ) \

        ); \

    }

// Produces a forwarding layer in the default evaluation machine.

//

// data is a tuple:

//

//   (name, split_args)

//

// Where name is the base name of the function, and split_args is a tuple:

//

//   (required_count, required_args, optional_count, required_args)

//

// defines the actual function body for BOOST_PARAMETER_FUNCTION_DEFAULT_FUNCTION below.

# define BOOST_PARAMETER_FUNCTION_DEFAULT_FUNCTION0(z, n, data) \

    template < \

        class ResultType \

      , class Args \

        BOOST_PARAMETER_FUNCTION_DEFAULT_ARGUMENTS( \

            BOOST_PARAMETER_FUNCTION_DEFAULT_FUNCTION_TEMPLATE_ARG \

          , n \

          , BOOST_PP_TUPLE_ELEM(5,1,data) \

        ) \

    > \

    BOOST_PARAMETER_MEMBER_FUNCTION_STATIC(BOOST_PP_TUPLE_ELEM(5,0,data)) \

    ResultType BOOST_PARAMETER_FUNCTION_DEFAULT_NAME(BOOST_PP_TUPLE_ELEM(5,0,data))( \

        ResultType(*)() \

      , Args const& args \

      , int \

        BOOST_PARAMETER_FUNCTION_DEFAULT_ARGUMENTS( \

            BOOST_PARAMETER_FUNCTION_DEFAULT_FUNCTION_ARG \

          , n \

          , BOOST_PP_TUPLE_ELEM(5,1,data) \

        ) \

    ) BOOST_PP_EXPR_IF(BOOST_PP_TUPLE_ELEM(5,2,data), const) \

    BOOST_PP_IF( \

        n \

      , BOOST_PARAMETER_FUNCTION_DEFAULT_FUNCTION_BODY \

      , ; BOOST_PP_TUPLE_EAT(4) \

    )( \

        BOOST_PP_TUPLE_ELEM(5,0,data) \

      , n \

      , BOOST_PP_TUPLE_ELEM(5,1,data) \

      , BOOST_PP_TUPLE_ELEM(5,3,data) \

    )

# define BOOST_PARAMETER_FUNCTION_DEFAULT_FUNCTION(z, n, data) \

    BOOST_PP_IF( \

        BOOST_PP_AND( \

            BOOST_PP_NOT(n) \

          , BOOST_PP_TUPLE_ELEM(5,4,data) \

        ) \

      , BOOST_PP_TUPLE_EAT(3) \

      , BOOST_PARAMETER_FUNCTION_DEFAULT_FUNCTION0 \

    )(z, n, data) \

    BOOST_PP_IF( \

        BOOST_PP_EQUAL(n, BOOST_PP_TUPLE_ELEM(4,2,BOOST_PP_TUPLE_ELEM(5,1,data))) \

      , BOOST_PP_TUPLE_EAT(5) \

      , BOOST_PARAMETER_FUNCTION_DEFAULT_EVAL_DEFAULT_BODY \

    )( \

        BOOST_PP_TUPLE_ELEM(5,0,data) \

      , n \

      , BOOST_PP_TUPLE_ELEM(5,1,data) \

      , BOOST_PP_TUPLE_ELEM(5,3,data) \

      , BOOST_PP_TUPLE_ELEM(5,2,data) \

    )

# define BOOST_PARAMETER_FUNCTION_DEFAULT_GET_ARG(r, tag_ns, arg) \

    , BOOST_PARAMETER_FUNCTION_CAST( \

          args[ \

              boost::parameter::keyword<tag_ns::BOOST_PARAMETER_FN_ARG_KEYWORD(arg)>::get() \

          ] \

        , BOOST_PARAMETER_FN_ARG_PRED(arg) \

      )

// Generates the function template that recives a ArgumentPack, and then

// goes on to call the layers of overloads generated by 

// BOOST_PARAMETER_FUNCTION_DEFAULT_LAYER.

# define BOOST_PARAMETER_FUNCTION_INITIAL_DISPATCH_FUNCTION(name, split_args, const_, tag_ns) \

    template <class Args> \

    typename BOOST_PARAMETER_FUNCTION_RESULT_NAME(name)<Args>::type \

    BOOST_PARAMETER_MEMBER_FUNCTION_STATIC(name) \

    BOOST_PARAMETER_IMPL(name)(Args const& args) BOOST_PP_EXPR_IF(const_, const) \

    { \

        return BOOST_PARAMETER_FUNCTION_DEFAULT_NAME(name)( \

            (typename BOOST_PARAMETER_FUNCTION_RESULT_NAME(name)<Args>::type(*)())0 \

          , args \

          , 0L \

 \

            BOOST_PP_SEQ_FOR_EACH( \

                BOOST_PARAMETER_FUNCTION_DEFAULT_GET_ARG \

              , tag_ns \

              , BOOST_PP_TUPLE_ELEM(4,1,split_args) \

            ) \

 \

        ); \

    }

// Helper for BOOST_PARAMETER_FUNCTION_DEFAULT_LAYER below.

# define BOOST_PARAMETER_FUNCTION_DEFAULT_LAYER_AUX( \

    name, split_args, skip_fwd_decl, const_, tag_namespace \

  ) \

    BOOST_PP_REPEAT_FROM_TO( \

        0 \

      , BOOST_PP_INC(BOOST_PP_TUPLE_ELEM(4, 2, split_args)) \

      , BOOST_PARAMETER_FUNCTION_DEFAULT_FUNCTION \

      , (name, split_args, const_, tag_namespace, skip_fwd_decl) \

    ) \

 \

    BOOST_PARAMETER_FUNCTION_INITIAL_DISPATCH_FUNCTION(name, split_args, const_, tag_namespace) \

\

    template < \

        class ResultType \

      , class Args \

        BOOST_PARAMETER_FUNCTION_DEFAULT_ARGUMENTS( \

            BOOST_PARAMETER_FUNCTION_DEFAULT_FUNCTION_TEMPLATE_ARG \

          , 0 \

          , split_args \

        ) \

    > \

    BOOST_PARAMETER_MEMBER_FUNCTION_STATIC(name) \

    ResultType BOOST_PARAMETER_FUNCTION_DEFAULT_NAME(name)( \

        ResultType(*)() \

      , Args const& args \

      , int \

        BOOST_PARAMETER_FUNCTION_DEFAULT_ARGUMENTS( \

            BOOST_PARAMETER_FUNCTION_DEFAULT_FUNCTION_ARG \

          , 0 \

          , split_args \

        ) \

    ) BOOST_PP_EXPR_IF(const_, const)

// Generates a bunch of forwarding functions that each extract

// one more argument.

# define BOOST_PARAMETER_FUNCTION_DEFAULT_LAYER(name, args, skip_fwd_decl, const_, tag_ns) \

    BOOST_PARAMETER_FUNCTION_DEFAULT_LAYER_AUX( \

        name, BOOST_PARAMETER_FUNCTION_SPLIT_ARGS(args), skip_fwd_decl, const_, tag_ns \

    )

/**/

// Defines the result metafunction and the parameters specialization.

# define BOOST_PARAMETER_FUNCTION_HEAD(result, name, tag_namespace, args)   \

      BOOST_PARAMETER_FUNCTION_RESULT(result, name, args)                   \

                                                                            \

          BOOST_PARAMETER_FUNCTION_PARAMETERS(tag_namespace, name, args)    \

          BOOST_PARAMETER_FUNCTION_PARAMETERS_NAME(name);                   \

// Helper for BOOST_PARAMETER_FUNCTION below.

# define BOOST_PARAMETER_FUNCTION_AUX(result, name, tag_namespace, args)    \

    BOOST_PARAMETER_FUNCTION_HEAD(result, name, tag_namespace, args)         \

    BOOST_PARAMETER_FUNCTION_IMPL_HEAD(name); \

\

    BOOST_PARAMETER_FUNCTION_FWD_FUNCTIONS(                                  \

        result, name, args, 0                                                \

      , BOOST_PARAMETER_FUNCTION_FWD_COMBINATIONS(args)                      \

    )                                                                        \

                                                                             \

    BOOST_PARAMETER_FUNCTION_DEFAULT_LAYER(name, args, 0, 0, tag_namespace)

// Defines a Boost.Parameter enabled function with the new syntax.

# define BOOST_PARAMETER_FUNCTION(result, name, tag_namespace, args)    \

    BOOST_PARAMETER_FUNCTION_AUX(                                       \

        result, name, tag_namespace                                      \

      , BOOST_PARAMETER_FLATTEN(3, 2, 3, args)                           \

    )                                                                    \

/**/

// Defines a Boost.Parameter enabled function.

# define BOOST_PARAMETER_BASIC_FUNCTION_AUX(result, name, tag_namespace, args)    \

    BOOST_PARAMETER_FUNCTION_HEAD(result, name, tag_namespace, args)        \

                                                                            \

    BOOST_PARAMETER_FUNCTION_IMPL_FWD(name)                                 \

                                                                            \

    BOOST_PARAMETER_FUNCTION_FWD_FUNCTIONS(                                 \

        result, name, args, 0                                               \

      , BOOST_PARAMETER_FUNCTION_FWD_COMBINATIONS(args)                     \

    )                                                                       \

                                                                            \

    BOOST_PARAMETER_FUNCTION_IMPL_HEAD(name)

# define BOOST_PARAMETER_BASIC_FUNCTION(result, name, tag_namespace, args)  \

    BOOST_PARAMETER_BASIC_FUNCTION_AUX(                                     \

        result, name, tag_namespace                                     \

      , BOOST_PARAMETER_FLATTEN(2, 2, 3, args)                          \

    )                                                                   \

/**/

// Defines a Boost.Parameter enabled member function.

# define BOOST_PARAMETER_BASIC_MEMBER_FUNCTION_AUX(result, name, tag_namespace, args, const_) \

    BOOST_PARAMETER_FUNCTION_HEAD(result, name, tag_namespace, args)                    \

                                                                                        \

    BOOST_PARAMETER_FUNCTION_FWD_FUNCTIONS(                                             \

        result, name, args, const_                                                      \

      , BOOST_PARAMETER_FUNCTION_FWD_COMBINATIONS(args)                                 \

    )                                                                                   \

                                                                                        \

    BOOST_PARAMETER_FUNCTION_IMPL_HEAD(name) BOOST_PP_EXPR_IF(const_, const)            \

/**/

# define BOOST_PARAMETER_BASIC_MEMBER_FUNCTION(result, name, tag_namespace, args) \

    BOOST_PARAMETER_BASIC_MEMBER_FUNCTION_AUX( \

        result, name, tag_namespace \

      , BOOST_PARAMETER_FLATTEN(2, 2, 3, args) \

      , 0 \

    )

/**/

# define BOOST_PARAMETER_BASIC_CONST_MEMBER_FUNCTION(result, name, tag_namespace, args) \

    BOOST_PARAMETER_BASIC_MEMBER_FUNCTION_AUX( \

        result, name, tag_namespace \

      , BOOST_PARAMETER_FLATTEN(2, 2, 3, args) \

      , 1 \

    )

/**/

# define BOOST_PARAMETER_MEMBER_FUNCTION_AUX(result, name, tag_namespace, const_, args)    \

    BOOST_PARAMETER_FUNCTION_HEAD(result, name, tag_namespace, args)         \

\

    BOOST_PARAMETER_FUNCTION_FWD_FUNCTIONS(                                  \

        result, name, args, const_                                           \

      , BOOST_PARAMETER_FUNCTION_FWD_COMBINATIONS(args)                      \

    )                                                                        \

                                                                             \

    BOOST_PARAMETER_FUNCTION_DEFAULT_LAYER(name, args, 1, const_, tag_namespace)

// Defines a Boost.Parameter enabled function with the new syntax.