*** pointer_holder.hpp.orig	2006-11-24 22:39:59.000000000 +0200
--- pointer_holder.hpp	2006-12-08 20:05:58.000000000 +0200
***************
*** 35,40 ****
--- 35,42 ----
  
  #  include <boost/detail/workaround.hpp>
  
+ #  include <boost/type_traits/remove_const.hpp>
+ 
  namespace boost { namespace python {
  
  template <class T> class wrapper;
***************
*** 122,146 ****
  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 = get_pointer(this->m_p);
      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))
      )
--- 124,153 ----
  template <class Pointer, class Value>
  void* pointer_holder<Pointer, Value>::holds(type_info dst_t, bool null_ptr_only)
  {
+     typedef typename boost::remove_const< Value >::type NonConstValue;
+     
      if (dst_t == python::type_id<Pointer>()
          && !(null_ptr_only && get_pointer(this->m_p))
      )
          return &this->m_p;
!     
!     Value* tmp = get_pointer(this->m_p);
!     NonConstValue* p = const_cast<NonConstValue*>( tmp );
      if (p == 0)
          return 0;
      
      if (void* wrapped = holds_wrapped(dst_t, p, p))
          return wrapped;
      
!     type_info src_t = python::type_id<NonConstValue>();
      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)
  {
+     typedef typename boost::remove_const< Value >::type NonConstValue;
+     
      if (dst_t == python::type_id<Pointer>()
          && !(null_ptr_only && get_pointer(this->m_p))
      )
***************
*** 149,160 ****
      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);
  }
  
--- 156,168 ----
      if (!get_pointer(this->m_p))
          return 0;
      
!     Value* tmp = get_pointer(this->m_p);
!     NonConstValue* p = const_cast<NonConstValue*>( tmp );
      
      if (dst_t == python::type_id<held_type>())
          return p;
  
!     type_info src_t = python::type_id<NonConstValue>();
      return src_t == dst_t ? p : find_dynamic_type(p, src_t, dst_t);
  }