text: #if !defined(BOOST_PP_IS_ITERATING)
  
  // Copyright David Abrahams 2001.
  // 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 POINTER_HOLDER_DWA20011215_HPP
  #  define POINTER_HOLDER_DWA20011215_HPP 
  
  # include <boost/get_pointer.hpp>
  #  include <boost/type.hpp>
  
  #  include <boost/python/instance_holder.hpp>
  #  include <boost/python/object/inheritance_query.hpp>
  #  include <boost/python/object/forward.hpp>
  
  #  include <boost/python/pointee.hpp>
  #  include <boost/python/type_id.hpp>
  
  #  include <boost/python/detail/wrapper_base.hpp>
  #  include <boost/python/detail/force_instantiate.hpp>
  #  include <boost/python/detail/preprocessor.hpp>
  
  
  #  include <boost/mpl/if.hpp>
  #  include <boost/mpl/apply.hpp>
  
  #  include <boost/preprocessor/comma_if.hpp>
  #  include <boost/preprocessor/iterate.hpp>
  #  include <boost/preprocessor/repeat.hpp>
  #  include <boost/preprocessor/debug/line.hpp>
  #  include <boost/preprocessor/enum_params.hpp>
  #  include <boost/preprocessor/repetition/enum_binary_params.hpp>
  
  #  include <boost/detail/workaround.hpp>
  
  namespace boost { namespace python {
  
  template <class T> class wrapper;
  
  }}
  
  
  namespace boost { namespace python { namespace objects {
  
  #  if BOOST_WORKAROUND(__GNUC__, == 2)
  #   define BOOST_PYTHON_UNFORWARD_LOCAL(z, n, _) BOOST_PP_COMMA_IF(n) (typename unforward<A##n>::type)objects::do_unforward(a##n,0)
  #  else
  #   define BOOST_PYTHON_UNFORWARD_LOCAL(z, n, _) BOOST_PP_COMMA_IF(n) objects::do_unforward(a##n,0)
  #  endif 
  
  template <class Pointer, class Value>
  struct pointer_holder : instance_holder
  {
      typedef Value value_type;
      
      pointer_holder(Pointer);
  
      // Forward construction to the held object
  
  #  define BOOST_PP_ITERATION_PARAMS_1 (4, (0, BOOST_PYTHON_MAX_ARITY, <boost/python/object/pointer_holder.hpp>, 1))
  #  include BOOST_PP_ITERATE()
  
   private: // types
      
   private: // required holder implementation
      void* holds(type_info, bool null_ptr_only);
      
      template <class T>
      inline void* holds_wrapped(type_info dst_t, wrapper<T>*,T* p)
      {
          return python::type_id<T>() == dst_t ? p : 0;
      }
      
      inline void* holds_wrapped(type_info, ...)
      {
          return 0;
      }
  
   private: // data members
      Pointer m_p;
  };
  
  template <class Pointer, class Value>
  struct pointer_holder_back_reference : instance_holder
  {
   private:
      typedef typename python::pointee<Pointer>::type held_type;
   public:
      typedef Value value_type;
  
      // Not sure about this one -- can it work? The source object
      // undoubtedly does not carry the correct back reference pointer.
      pointer_holder_back_reference(Pointer);
  
      // Forward construction to the held object
  #  define BOOST_PP_ITERATION_PARAMS_1 (4, (0, BOOST_PYTHON_MAX_ARITY, <boost/python/object/pointer_holder.hpp>, 2))
  #  include BOOST_PP_ITERATE()
  
   private: // required holder implementation
      void* holds(type_info, bool null_ptr_only);
  
   private: // data members
      Pointer m_p;
  };
  
  #  undef BOOST_PYTHON_UNFORWARD_LOCAL
  
  template <class Pointer, class Value>
  inline pointer_holder<Pointer,Value>::pointer_holder(Pointer p)
      : m_p(p)
  {
  }
  
  template <class Pointer, class Value>
  inline pointer_holder_back_reference<Pointer,Value>::pointer_holder_back_reference(Pointer p)
      : m_p(p)
  {
  }
  
  template <class Pointer, class Value>
  void* pointer_holder<Pointer, Value>::holds(type_info dst_t, bool null_ptr_only)
  {
      if (dst_t == python::type_id<Pointer>()
          && !(null_ptr_only && get_pointer(this->m_p))
      )
          return &this->m_p;
  
      Value* p
  #  if BOOST_WORKAROUND(__SUNPRO_CC, BOOST_TESTED_AT(0x590))
          = static_cast<Value*>( get_pointer(this->m_p) )
  #  else 
          = get_pointer(this->m_p)
  #  endif
          ;
      
      if (p == 0)
          return 0;
      
      if (void* wrapped = holds_wrapped(dst_t, p, p))
          return wrapped;
      
      type_info src_t = python::type_id<Value>();
      return src_t == dst_t ? p : find_dynamic_type(p, src_t, dst_t);
  }
  
  template <class Pointer, class Value>
  void* pointer_holder_back_reference<Pointer, Value>::holds(type_info dst_t, bool null_ptr_only)
  {
      if (dst_t == python::type_id<Pointer>()
          && !(null_ptr_only && get_pointer(this->m_p))
      )
          return &this->m_p;
  
      if (!get_pointer(this->m_p))
          return 0;
      
      Value* p = get_pointer(m_p);
      
      if (dst_t == python::type_id<held_type>())
          return p;
  
      type_info src_t = python::type_id<Value>();
      return src_t == dst_t ? p : find_dynamic_type(p, src_t, dst_t);
  }
  
  }}} // namespace boost::python::objects
  
  # endif // POINTER_HOLDER_DWA20011215_HPP
  
  /* --------------- pointer_holder --------------- */
  // For gcc 4.4 compatability, we must include the
  // BOOST_PP_ITERATION_DEPTH test inside an #else clause.
  #else // BOOST_PP_IS_ITERATING
  #if BOOST_PP_ITERATION_DEPTH() == 1 && BOOST_PP_ITERATION_FLAGS() == 1
  # if !(BOOST_WORKAROUND(__MWERKS__, > 0x3100)                      \
          && BOOST_WORKAROUND(__MWERKS__, BOOST_TESTED_AT(0x3201)))
  #  line BOOST_PP_LINE(__LINE__, pointer_holder.hpp)
  # endif
  
  # define N BOOST_PP_ITERATION()
  
  # if (N != 0)
      template< BOOST_PP_ENUM_PARAMS_Z(1, N, class A) >
  # endif
      pointer_holder(PyObject* self BOOST_PP_COMMA_IF(N) BOOST_PP_ENUM_BINARY_PARAMS_Z(1, N, A, a))
          : m_p(new Value(
                  BOOST_PP_REPEAT_1ST(N, BOOST_PYTHON_UNFORWARD_LOCAL, nil)
              ))
      {
          python::detail::initialize_wrapper(self, get_pointer(this->m_p));
      }
  
  # undef N
  
  /* --------------- pointer_holder_back_reference --------------- */
  #elif BOOST_PP_ITERATION_DEPTH() == 1 && BOOST_PP_ITERATION_FLAGS() == 2
  # if !(BOOST_WORKAROUND(__MWERKS__, > 0x3100)                      \
          && BOOST_WORKAROUND(__MWERKS__, BOOST_TESTED_AT(0x3201)))
  #  line BOOST_PP_LINE(__LINE__, pointer_holder.hpp(pointer_holder_back_reference))
  # endif 
  
  # define N BOOST_PP_ITERATION()
  
  # if (N != 0)
      template < BOOST_PP_ENUM_PARAMS_Z(1, N, class A) >
  # endif
      pointer_holder_back_reference(
          PyObject* p BOOST_PP_COMMA_IF(N) BOOST_PP_ENUM_BINARY_PARAMS_Z(1, N, A, a))
          : m_p(new held_type(
                      p BOOST_PP_COMMA_IF(N) BOOST_PP_REPEAT_1ST(N, BOOST_PYTHON_UNFORWARD_LOCAL, nil)
              ))
      {}
  
  # undef N
  
  #endif // BOOST_PP_ITERATION_DEPTH()
  #endif
  