///////////////////////////////////////////////////////////////////////////////

//

// Copyright David Abrahams 2002, Joel de Guzman, 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)

//

///////////////////////////////////////////////////////////////////////////////

#if !defined(BOOST_PP_IS_ITERATING)

# ifndef SIGNATURE_JDG20020813_HPP

#  define SIGNATURE_JDG20020813_HPP

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

# include <boost/mpl/if.hpp>

# include <boost/type_traits/is_convertible.hpp>

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

#  include <boost/preprocessor/repeat.hpp>

#  include <boost/preprocessor/enum.hpp>

#  include <boost/preprocessor/enum_params.hpp>

#  include <boost/preprocessor/empty.hpp>

#  include <boost/preprocessor/arithmetic/sub.hpp>

#  include <boost/preprocessor/iterate.hpp>

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

#  include <boost/preprocessor/debug/line.hpp>

#  include <boost/preprocessor/arithmetic/sub.hpp>

#  include <boost/preprocessor/arithmetic/inc.hpp>

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

# define BOOST_PYTHON_LIST_INC(n)        \

   BOOST_PP_CAT(mpl::vector, BOOST_PP_INC(n))

///////////////////////////////////////////////////////////////////////////////

namespace boost { namespace python { namespace detail {

// A metafunction returning C1 if C1 is derived from C2, and C2

// otherwise

template <class C1, class C2>

struct most_derived

{

    typedef typename mpl::if_<

        is_convertible<C1*,C2*>

      , C1

      , C2

    >::type type;

};

//  The following macros generate expansions for::

//

//      template <class RT, class T0... class TN>

//      inline mpl::vector<RT, T0...TN>

//      get_signature(RT(*)(T0...TN), void* = 0)

//      {

//          return mpl::list<RT, T0...TN>();

//      }

//

//   And, for an appropriate assortment of cv-qualifications::

//

//      template <class RT, class ClassT, class T0... class TN>

//      inline mpl::vector<RT, ClassT&, T0...TN>

//      get_signature(RT(ClassT::*)(T0...TN) cv))

//      {

//          return mpl::list<RT, ClassT&, T0...TN>();

//      }

//

//      template <class Target, class RT, class ClassT, class T0... class TN>

//      inline mpl::vector<

//          RT

//        , typename most_derived<Target, ClassT>::type&

//        , T0...TN

//      >

//      get_signature(RT(ClassT::*)(T0...TN) cv), Target*)

//      {

//          return mpl::list<RT, ClassT&, T0...TN>();

//      }

//

//  There are two forms for invoking get_signature::

//

//      get_signature(f)

//

//  and ::

//

//      get_signature(f,(Target*)0)

//

//  These functions extract the return type, class (for member

//  functions) and arguments of the input signature and stuff them in

//  an mpl type sequence.  Note that cv-qualification is dropped from

//  the "hidden this" argument of member functions; that is a

//  necessary sacrifice to ensure that an lvalue from_python converter

//  is used.  A pointer is not used so that None will be rejected for

//  overload resolution.

//

//  The second form of get_signature essentially downcasts the "hidden

//  this" argument of member functions to Target, because the function

//  may actually be a member of a base class which is not wrapped, and

//  in that case conversion from python would fail.

//

// @group {

#  define BOOST_PP_ITERATION_PARAMS_1                                   \

    (3, (0, BOOST_PYTHON_MAX_ARITY, <boost/python/signature.hpp>))

#  include BOOST_PP_ITERATE()

#  undef BOOST_PYTHON_LIST_INC

// }

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

# endif // SIGNATURE_JDG20020813_HPP

#elif BOOST_PP_ITERATION_DEPTH() == 1 // defined(BOOST_PP_IS_ITERATING)

# define N BOOST_PP_ITERATION()

template <

    class RT BOOST_PP_ENUM_TRAILING_PARAMS_Z(1, N, class T)>

inline BOOST_PYTHON_LIST_INC(N)<

    RT BOOST_PP_ENUM_TRAILING_PARAMS_Z(1, N, T)>

get_signature(RT(*)(BOOST_PP_ENUM_PARAMS_Z(1, N, T)), void* = 0)

{

    return BOOST_PYTHON_LIST_INC(N)<

            RT BOOST_PP_ENUM_TRAILING_PARAMS_Z(1, N, T)

        >();

}

# undef N

# define BOOST_PP_ITERATION_PARAMS_2 \

    (3, (0, 3, <boost/python/signature.hpp>))

# include BOOST_PP_ITERATE()

#else

# define N BOOST_PP_RELATIVE_ITERATION(1)

# define Q BOOST_PYTHON_CV_QUALIFIER(BOOST_PP_ITERATION())

template <

    class RT, class ClassT BOOST_PP_ENUM_TRAILING_PARAMS_Z(1, N, class T)>

inline BOOST_PYTHON_LIST_INC(BOOST_PP_INC(N))<

    RT, ClassT& BOOST_PP_ENUM_TRAILING_PARAMS_Z(1, N, T)>

get_signature(RT(ClassT::*)(BOOST_PP_ENUM_PARAMS_Z(1, N, T)) Q)

{

    return BOOST_PYTHON_LIST_INC(BOOST_PP_INC(N))<

            RT, ClassT& BOOST_PP_ENUM_TRAILING_PARAMS_Z(1, N, T)

        >();

}

template <

    class Target

  , class RT

  , class ClassT

    BOOST_PP_ENUM_TRAILING_PARAMS_Z(1, N, class T)

>

inline BOOST_PYTHON_LIST_INC(BOOST_PP_INC(N))<

    RT

  , typename most_derived<Target, ClassT>::type&

    BOOST_PP_ENUM_TRAILING_PARAMS_Z(1, N, T)

>

get_signature(

    RT(ClassT::*)(BOOST_PP_ENUM_PARAMS_Z(1, N, T)) Q

  , Target*

)

{

    return BOOST_PYTHON_LIST_INC(BOOST_PP_INC(N))<

        RT

      , BOOST_DEDUCED_TYPENAME most_derived<Target, ClassT>::type&

        BOOST_PP_ENUM_TRAILING_PARAMS_Z(1, N, T)

    >();

}

# undef Q

# undef N

#endif // !defined(BOOST_PP_IS_ITERATING)