// 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 DATA_MEMBERS_DWA2002328_HPP
# define DATA_MEMBERS_DWA2002328_HPP

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namespace boost { namespace python { 

//
// This file defines the make_getter and make_setter function
// families, which are responsible for turning pointers, references,
// and pointers-to-data-members into callable Python objects which
// can be used for attribute access on wrapped classes.
//

namespace detail
{

  // A small function object which handles the getting and setting of
  // data members.
  template 
  struct member
  {
   public:      
      member(Data Class::*which) : m_which(which) {}
      
      Data& operator()(Class& c) const
      {
          return c.*m_which;
      }

      void operator()(Class& c, typename value_arg::type d) const
      {
          c.*m_which = d;
      }
   private:
      Data Class::*m_which;
  };

  // A small function object which handles the getting and setting of
  // non-member objects.
  template 
  struct datum
  {
   public:      
      datum(Data *which) : m_which(which) {}
      
      Data& operator()() const
      {
          return *m_which;
      }

      void operator()(typename value_arg::type d) const
      {
          *m_which = d;
      }
   private:
      Data *m_which;
  };
  
  //
  // Helper metafunction for determining the default CallPolicy to use
  // for attribute access.  If T is a [reference to a] class type X
  // whose conversion to python would normally produce a new copy of X
  // in a wrapped X class instance (as opposed to types such as
  // std::string, which are converted to native Python types, and
  // smart pointer types which produce a wrapped class instance of the
  // pointee type), to-python conversions will attempt to produce an
  // object which refers to the original C++ object, rather than a
  // copy.  See default_member_getter_policy for rationale.
  // 
  template 
  struct default_getter_by_ref
      : mpl::and_<
          mpl::bool_<
              to_python_value<
                  typename value_arg::type
              >::uses_registry
          >
        , indirect_traits::is_reference_to_class<
              typename value_arg::type
          >
       >
  {
  };

  // Metafunction computing the default CallPolicy to use for reading
  // data members
  //
  // If it's a regular class type (not an object manager or other
  // type for which we have to_python specializations, use
  // return_internal_reference so that we can do things like
  //    x.y.z =  1
  // and get the right result.
  template 
  struct default_member_getter_policy
    : mpl::if_<
          default_getter_by_ref
        , return_internal_reference
        , return_value_policy
      >
  {};

  // Metafunction computing the default CallPolicy to use for reading
  // non-member data.
  template 
  struct default_datum_getter_policy
    : mpl::if_<
          default_getter_by_ref
        , return_value_policy
        , return_value_policy
      >
  {};

  //
  // make_getter helper function family -- These helpers to
  // boost::python::make_getter are used to dispatch behavior.  The
  // third argument is a workaround for a CWPro8 partial ordering bug
  // with pointers to data members.  It should be convertible to
  // detail::true_ iff the first argument is a pointer-to-member, and
  // detail::false_ otherwise.  The fourth argument is for compilers
  // which don't support partial ordering at all and should always be
  // passed 0L.


#if BOOST_WORKAROUND(__EDG_VERSION__,