#if !defined(BOOST_PP_IS_ITERATING)

// Copyright David Abrahams 2002.

// 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)

# ifndef CALLER_DWA20021121_HPP

#  define CALLER_DWA20021121_HPP

#  include <boost/python/type_id.hpp>

#  include <boost/python/handle.hpp>

#  include <boost/python/detail/invoke.hpp>

#  include <boost/python/detail/signature.hpp>

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

#  include <boost/python/arg_from_python.hpp>

#  include <boost/python/converter/context_result_converter.hpp>

#  include <boost/preprocessor/iterate.hpp>

#  include <boost/preprocessor/cat.hpp>

#  include <boost/preprocessor/dec.hpp>

#  include <boost/preprocessor/if.hpp>

#  include <boost/preprocessor/iteration/local.hpp>

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

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

#  include <boost/compressed_pair.hpp>

#  include <boost/type_traits/is_same.hpp>

#  include <boost/type_traits/is_convertible.hpp>

#  include <boost/mpl/apply.hpp>

#  include <boost/mpl/eval_if.hpp>

#  include <boost/mpl/identity.hpp>

#  include <boost/mpl/size.hpp>

#  include <boost/mpl/at.hpp>

#  include <boost/mpl/int.hpp>

#  include <boost/mpl/next.hpp>

namespace boost { namespace python { namespace detail { 

template <int N>

inline PyObject* get(mpl::int_<N>, PyObject* const& args_)

{

    return PyTuple_GET_ITEM(args_,N);

}

inline unsigned arity(PyObject* const& args_)

{

    return PyTuple_GET_SIZE(args_);

}

// This "result converter" is really just used as

// a dispatch tag to invoke(...), selecting the appropriate

// implementation

typedef int void_result_to_python;

// Given a model of CallPolicies and a C++ result type, this

// metafunction selects the appropriate converter to use for

// converting the result to python.

template <class Policies, class Result>

struct select_result_converter

  : mpl::eval_if<

        is_same<Result,void>

      , mpl::identity<void_result_to_python>

      , mpl::apply1<typename Policies::result_converter,Result>

    >

{

};

template <class ArgPackage, class ResultConverter>

inline ResultConverter create_result_converter(

    ArgPackage const& args_

  , ResultConverter*

  , converter::context_result_converter*

)

{

    return ResultConverter(args_);

}

template <class ArgPackage, class ResultConverter>

inline ResultConverter create_result_converter(

    ArgPackage const&

  , ResultConverter*

  , ...

)

{

    return ResultConverter();

}

template <unsigned> struct caller_arity;

template <class F, class CallPolicies, class Sig>

struct caller;

#  define BOOST_PYTHON_NEXT(init,name,n)                                                        \

    typedef BOOST_PP_IF(n,typename mpl::next< BOOST_PP_CAT(name,BOOST_PP_DEC(n)) >::type, init) name##n;

#  define BOOST_PYTHON_ARG_CONVERTER(n)                                         \

     BOOST_PYTHON_NEXT(typename mpl::next<first>::type, arg_iter,n)             \

     typedef arg_from_python<BOOST_DEDUCED_TYPENAME arg_iter##n::type> c_t##n;  \

     c_t##n c##n(get(mpl::int_<n>(), inner_args));                              \

     if (!c##n.convertible())                                                   \

          return 0;

#  define BOOST_PP_ITERATION_PARAMS_1                                            \

        (3, (0, BOOST_PYTHON_MAX_ARITY + 1, <boost/python/detail/caller.hpp>))

#  include BOOST_PP_ITERATE()

#  undef BOOST_PYTHON_ARG_CONVERTER

#  undef BOOST_PYTHON_NEXT

// A metafunction returning the base class used for caller<class F,

// class ConverterGenerators, class CallPolicies, class Sig>.

template <class F, class CallPolicies, class Sig>

struct caller_base_select

{

    enum { arity = mpl::size<Sig>::value - 1 };

    typedef typename caller_arity<arity>::template impl<F,CallPolicies,Sig> type;

};

// A function object type which wraps C++ objects as Python callable

// objects.

//

// Template Arguments:

//

//   F -

//      the C++ `function object' that will be called. Might

//      actually be any data for which an appropriate invoke_tag() can

//      be generated. invoke(...) takes care of the actual invocation syntax.

//

//   CallPolicies -

//      The precall, postcall, and what kind of resultconverter to

//      generate for mpl::front<Sig>::type

//

//   Sig -

//      The `intended signature' of the function. An MPL sequence

//      beginning with a result type and continuing with a list of

//      argument types.

template <class F, class CallPolicies, class Sig>

struct caller

    : caller_base_select<F,CallPolicies,Sig>::type

{

    typedef typename caller_base_select<

        F,CallPolicies,Sig

        >::type base;

    typedef PyObject* result_type;

    caller(F f, CallPolicies p) : base(f,p) {}

};

}}} // namespace boost::python::detail

# endif // CALLER_DWA20021121_HPP

#else

# define N BOOST_PP_ITERATION()

template <>

struct caller_arity<N>

{

    template <class F, class Policies, class Sig>

    struct impl

    {

        impl(F f, Policies p) : m_data(f,p) {}

        PyObject* operator()(PyObject* args_, PyObject*) // eliminate

                                                         // this

                                                         // trailing

                                                         // keyword dict

        {

            typedef typename mpl::begin<Sig>::type first;

            typedef typename first::type result_t;

            typedef typename select_result_converter<Policies, result_t>::type result_converter;

            typedef typename Policies::argument_package argument_package;

            argument_package inner_args(args_);

# if N

#  define BOOST_PP_LOCAL_MACRO(i) BOOST_PYTHON_ARG_CONVERTER(i)

#  define BOOST_PP_LOCAL_LIMITS (0, N-1)

#  include BOOST_PP_LOCAL_ITERATE()

# endif 

            // all converters have been checked. Now we can do the

            // precall part of the policy

            if (!m_data.second().precall(inner_args))

                return 0;

            PyObject* result = detail::invoke(

                detail::invoke_tag<result_t,F>()

              , create_result_converter(args_, (result_converter*)0, (result_converter*)0)

              , m_data.first()

                BOOST_PP_ENUM_TRAILING_PARAMS(N, c)

            );

            return m_data.second().postcall(inner_args, result);

        }

        static unsigned min_arity() { return N; }

        static signature_element const* signature()

        {

            return detail::signature<Sig>::elements();

        }

     private:

        compressed_pair<F,Policies> m_data;

    };

};

#endif // BOOST_PP_IS_ITERATING