diff --git a/include/boost/python/class.hpp b/include/boost/python/class.hpp
index 8dede0e3..7f31df88 100644
--- a/include/boost/python/class.hpp
+++ b/include/boost/python/class.hpp
@@ -9,6 +9,7 @@
 # include <boost/python/class_fwd.hpp>
 # include <boost/python/reference.hpp>
 # include <boost/python/object/class.hpp>
+# include <boost/python/object/value_holder_fwd.hpp>
 # include <boost/python/converter/type_id.hpp>
 # include <boost/python/detail/wrap_function.hpp>
 # include <boost/mpl/type_list.hpp>
@@ -32,12 +33,6 @@ namespace // put some convenience classes into the unnamed namespace for the use
 
 namespace boost { namespace python { 
 
-// Forward declarations
-namespace objects
-{
-  struct value_holder_generator;
-}
-
 namespace detail
 {
   // This is an mpl BinaryMetaFunction object with a runtime behavior,
diff --git a/include/boost/python/class_fwd.hpp b/include/boost/python/class_fwd.hpp
index 6faf7aae..bef2e250 100644
--- a/include/boost/python/class_fwd.hpp
+++ b/include/boost/python/class_fwd.hpp
@@ -5,6 +5,7 @@
 // to its suitability for any purpose.
 #ifndef CLASS_FWD_DWA200222_HPP
 # define CLASS_FWD_DWA200222_HPP
+# include <boost/python/object/value_holder_fwd.hpp>
 
 namespace boost { namespace python { 
 
@@ -13,15 +14,10 @@ namespace detail
   struct empty_list;
 }
 
-namespace objects
-{
-  struct value_holder_generator;
-}
-
 template <
     class T // class being wrapped
     , class Bases = detail::empty_list
-    , class HolderGenerator = objects::value_holder_generator
+    , class HolderGenerator = objects::value_holder_generator<>
     >
 class class_;
 
diff --git a/include/boost/python/object/class.hpp b/include/boost/python/object/class.hpp
index 0d5210c7..d453967c 100644
--- a/include/boost/python/object/class.hpp
+++ b/include/boost/python/object/class.hpp
@@ -11,7 +11,6 @@
 # include <boost/utility.hpp>
 # include <boost/python/converter/type_id.hpp>
 # include <boost/python/reference.hpp>
-# include <boost/iterator_adaptors.hpp>
 # include <cstddef>
 
 namespace boost { namespace python {
@@ -55,24 +54,6 @@ struct BOOST_PYTHON_DECL instance_holder : private noncopyable
     virtual void* holds(converter::undecorated_type_id_t) = 0;
 
     void install(PyObject* inst) throw();
-    
-    struct iterator_policies : default_iterator_policies
-    {
-        template <class Iterator>
-        void increment(Iterator& p)
-        {
-            p.base() = p.base()->next();
-        }
-    };
-    
-    typedef iterator_adaptor<
-        instance_holder*
-        , iterator_policies
-        , value_type_is<noncopyable>
-        , reference_is<instance_holder&>
-        , pointer_is<instance_holder*>
-        , iterator_category_is<std::input_iterator_tag> > iterator;
-    
  private:
     instance_holder* m_next;
 };
diff --git a/include/boost/python/object/make_holder.hpp b/include/boost/python/object/make_holder.hpp
index 825e02b0..1ba6f932 100644
--- a/include/boost/python/object/make_holder.hpp
+++ b/include/boost/python/object/make_holder.hpp
@@ -22,7 +22,7 @@ struct make_holder<0>
     template <class T, class Generator, class ArgList>
     struct apply
     {
-        typedef typename detail::eval<Generator,T>::type holder;
+        typedef typename python::detail::eval<Generator,T>::type holder;
         static void execute(
             PyObject* p)
         {
@@ -38,7 +38,7 @@ struct make_holder<1>
     template <class T, class Generator, class ArgList>
     struct apply
     {
-        typedef typename detail::eval<Generator,T>::type holder;
+        typedef typename python::detail::eval<Generator,T>::type holder;
         typedef typename mpl::at<0,ArgList>::type t0;
         typedef typename forward<t0>::type f0;
         
@@ -57,7 +57,7 @@ struct make_holder<2>
     template <class T, class Generator, class ArgList>
     struct apply
     {
-        typedef typename detail::eval<Generator,T>::type holder;
+        typedef typename python::detail::eval<Generator,T>::type holder;
         typedef typename mpl::at<0,ArgList>::type t0;
         typedef typename forward<t0>::type f0;
         typedef typename mpl::at<1,ArgList>::type t1;
@@ -77,7 +77,7 @@ struct make_holder<3>
     template <class T, class Generator, class ArgList>
     struct apply
     {
-        typedef typename detail::eval<Generator,T>::type holder;
+        typedef typename python::detail::eval<Generator,T>::type holder;
         typedef typename mpl::at<0,ArgList>::type t0;
         typedef typename forward<t0>::type f0;
         typedef typename mpl::at<1,ArgList>::type t1;
@@ -99,7 +99,7 @@ struct make_holder<4>
     template <class T, class Generator, class ArgList>
     struct apply
     {
-        typedef typename detail::eval<Generator,T>::type holder;
+        typedef typename python::detail::eval<Generator,T>::type holder;
         typedef typename mpl::at<0,ArgList>::type t0;
         typedef typename forward<t0>::type f0;
         typedef typename mpl::at<1,ArgList>::type t1;
@@ -123,7 +123,7 @@ struct make_holder<5>
     template <class T, class Generator, class ArgList>
     struct apply
     {
-        typedef typename detail::eval<Generator,T>::type holder;
+        typedef typename python::detail::eval<Generator,T>::type holder;
         typedef typename mpl::at<0,ArgList>::type t0;
         typedef typename forward<t0>::type f0;
         typedef typename mpl::at<1,ArgList>::type t1;
@@ -149,7 +149,7 @@ struct make_holder<6>
     template <class T, class Generator, class ArgList>
     struct apply
     {
-        typedef typename detail::eval<Generator,T>::type holder;
+        typedef typename python::detail::eval<Generator,T>::type holder;
         typedef typename mpl::at<0,ArgList>::type t0;
         typedef typename forward<t0>::type f0;
         typedef typename mpl::at<1,ArgList>::type t1;
diff --git a/include/boost/python/object/pointer_holder.hpp b/include/boost/python/object/pointer_holder.hpp
index c307f019..2722ae85 100644
--- a/include/boost/python/object/pointer_holder.hpp
+++ b/include/boost/python/object/pointer_holder.hpp
@@ -12,6 +12,7 @@
 # include <boost/python/detail/eval.hpp>
 # include <boost/ref.hpp>
 # include <boost/type.hpp>
+# include <boost/mpl/select_type.hpp>
 
 namespace boost { namespace python { namespace objects { 
 
@@ -145,7 +146,137 @@ struct pointer_holder : instance_holder
     Pointer m_p;
 };
 
-}}}
+template <class Pointer, class Value, class BackReferenceType>
+struct pointer_holder_back_reference : instance_holder
+{
+    pointer_holder_back_reference(Pointer);
+    
+    // Forward construction to the held object
+    pointer_holder_back_reference(PyObject* p)
+        : m_p(new Value(p)) {}
+
+    
+    template <class A1>
+    pointer_holder_back_reference(PyObject* p, A1 a1)
+        : m_p(new Value(p
+            , (typename unwrap_reference<A1>::type&)(a1)
+                  ))
+    {}
+    
+    template <class A1, class A2>
+    pointer_holder_back_reference(PyObject* p, A1 a1, A2 a2)
+        : m_p(new Value(p
+            , (typename unwrap_reference<A1>::type&)(a1)
+            , (typename unwrap_reference<A2>::type&)(a2)
+            ))
+    {}
+    
+    template <class A1, class A2, class A3>
+    pointer_holder_back_reference(PyObject* p, A1 a1, A2 a2, A3 a3)
+        : m_p(new Value(p
+            , (typename unwrap_reference<A1>::type&)(a1)
+            , (typename unwrap_reference<A2>::type&)(a2)
+            , (typename unwrap_reference<A3>::type&)(a3)
+            ))
+    {}
+    
+    template <class A1, class A2, class A3, class A4>
+    pointer_holder_back_reference(PyObject* p, A1 a1, A2 a2, A3 a3, A4 a4)
+        : m_p(new Value(p
+            , (typename unwrap_reference<A1>::type&)(a1)
+            , (typename unwrap_reference<A2>::type&)(a2)
+            , (typename unwrap_reference<A3>::type&)(a3)
+            , (typename unwrap_reference<A4>::type&)(a4)
+            ))
+    {}
+    
+    template <class A1, class A2, class A3, class A4, class A5>
+    pointer_holder_back_reference(PyObject* p, A1 a1, A2 a2, A3 a3, A4 a4, A5 a5)
+        : m_p(new Value(p
+            , (typename unwrap_reference<A1>::type&)(a1)
+            , (typename unwrap_reference<A2>::type&)(a2)
+            , (typename unwrap_reference<A3>::type&)(a3)
+            , (typename unwrap_reference<A4>::type&)(a4)
+            , (typename unwrap_reference<A5>::type&)(a5)
+            )) {}
+    
+    template <class A1, class A2, class A3, class A4, class A5, class A6>
+    pointer_holder_back_reference(PyObject* p, A1 a1, A2 a2, A3 a3, A4 a4, A5 a5, A6 a6)
+        : m_p(new Value(p
+            , (typename unwrap_reference<A1>::type&)(a1)
+            , (typename unwrap_reference<A2>::type&)(a2)
+            , (typename unwrap_reference<A3>::type&)(a3)
+            , (typename unwrap_reference<A4>::type&)(a4)
+            , (typename unwrap_reference<A5>::type&)(a5)
+            , (typename unwrap_reference<A6>::type&)(a6)
+            )) {}
+    
+    template <class A1, class A2, class A3, class A4, class A5, class A6, class A7>
+    pointer_holder_back_reference(PyObject* p, A1 a1, A2 a2, A3 a3, A4 a4, A5 a5, A6 a6, A7 a7)
+        : m_p(new Value(p
+            , (typename unwrap_reference<A1>::type&)(a1)
+            , (typename unwrap_reference<A2>::type&)(a2)
+            , (typename unwrap_reference<A3>::type&)(a3)
+            , (typename unwrap_reference<A4>::type&)(a4)
+            , (typename unwrap_reference<A5>::type&)(a5)
+            , (typename unwrap_reference<A6>::type&)(a6)
+            , (typename unwrap_reference<A7>::type&)(a7)
+            ))
+    {}
+    
+    template <class A1, class A2, class A3, class A4, class A5, class A6, class A7, class A8>
+    pointer_holder_back_reference(PyObject* p, A1 a1, A2 a2, A3 a3, A4 a4, A5 a5, A6 a6, A7 a7, A8 a8)
+        : m_p(new Value(p
+            , (typename unwrap_reference<A1>::type&)(a1)
+            , (typename unwrap_reference<A2>::type&)(a2)
+            , (typename unwrap_reference<A3>::type&)(a3)
+            , (typename unwrap_reference<A4>::type&)(a4)
+            , (typename unwrap_reference<A5>::type&)(a5)
+            , (typename unwrap_reference<A6>::type&)(a6)
+            , (typename unwrap_reference<A7>::type&)(a7)
+            , (typename unwrap_reference<A8>::type&)(a8)
+            ))
+    {}
+    
+    template <class A1, class A2, class A3, class A4, class A5, class A6, class A7, class A8, class A9>
+    pointer_holder_back_reference(PyObject* p, A1 a1, A2 a2, A3 a3, A4 a4, A5 a5, A6 a6, A7 a7, A8 a8, A9 a9)
+        : m_p(new Value(p
+            , (typename unwrap_reference<A1>::type&)(a1)
+            , (typename unwrap_reference<A2>::type&)(a2)
+            , (typename unwrap_reference<A3>::type&)(a3)
+            , (typename unwrap_reference<A4>::type&)(a4)
+            , (typename unwrap_reference<A5>::type&)(a5)
+            , (typename unwrap_reference<A6>::type&)(a6)
+            , (typename unwrap_reference<A7>::type&)(a7)
+            , (typename unwrap_reference<A8>::type&)(a8)
+            , (typename unwrap_reference<A9>::type&)(a9)
+            ))
+    {}
+    
+    template <class A1, class A2, class A3, class A4, class A5, class A6, class A7, class A8, class A9, class A10>
+    pointer_holder_back_reference(PyObject* p, A1 a1, A2 a2, A3 a3, A4 a4, A5 a5, A6 a6, A7 a7, A8 a8, A9 a9, A10 a10)
+        : m_p(new Value(p
+            , (typename unwrap_reference<A1>::type&)(a1)
+            , (typename unwrap_reference<A2>::type&)(a2)
+            , (typename unwrap_reference<A3>::type&)(a3)
+            , (typename unwrap_reference<A4>::type&)(a4)
+            , (typename unwrap_reference<A5>::type&)(a5)
+            , (typename unwrap_reference<A6>::type&)(a6)
+            , (typename unwrap_reference<A7>::type&)(a7)
+            , (typename unwrap_reference<A8>::type&)(a8)
+            , (typename unwrap_reference<A9>::type&)(a9)
+            , (typename unwrap_reference<A10>::type&)(a10)
+            ))
+    {}
+
+ private: // required holder implementation
+    void* holds(converter::undecorated_type_id_t);
+
+ private: // data members
+    Pointer m_p;
+};
+
+}}} // namespace boost::python::objects
 
 // back to namespace boost for this forward declaration
 namespace boost
@@ -164,19 +295,54 @@ struct shared_ptr_generator
     };
 };
 
+struct no_back_reference;
+
+// Workaround lack of partial specialization
+namespace detail
+{
+  template <class BackReferenceType, class PointerGenerator>
+  struct pointer_holder_back_reference_generator
+  {
+      template <class Held>
+      struct apply
+      {
+          typedef typename boost::python::detail::eval<
+              PointerGenerator,BackReferenceType
+              >::type pointer;
+              
+          typedef pointer_holder_back_reference<pointer,Held,BackReferenceType> type;
+      };
+  };
+
+  template <class PointerGenerator>
+  struct plain_pointer_holder_generator
+  {
+      template <class Held>
+      struct apply
+      {
+          typedef typename boost::python::detail::eval<
+              PointerGenerator,Held
+              >::type pointer;
+              
+          typedef pointer_holder<pointer, Held> type;
+      };
+  };
+}
+
 // A generator metafunction which can be passed to make_holder
 // PointerGenerator should be another generator metafunction which
 // makes the appropriate (smart) pointer type to hold the argument to
 // pointer_holder_generator.
-template <class PointerGenerator>
+template <class PointerGenerator, class BackReferenceType = no_back_reference>
 struct pointer_holder_generator
+    : mpl::select_type<
+          is_same<BackReferenceType,no_back_reference>::value
+          , detail::plain_pointer_holder_generator<
+                PointerGenerator>
+          , detail::pointer_holder_back_reference_generator<
+                BackReferenceType,PointerGenerator>
+      >::type
 {
-    template <class Held>
-    struct apply
-    {
-        typedef typename detail::eval<PointerGenerator,Held>::type pointer;
-        typedef pointer_holder<pointer, Held> type;
-    };
 };
 
 template <class Pointer, class Value>
diff --git a/include/boost/python/object/value_holder.hpp b/include/boost/python/object/value_holder.hpp
index 6533bc39..62222a23 100644
--- a/include/boost/python/object/value_holder.hpp
+++ b/include/boost/python/object/value_holder.hpp
@@ -6,6 +6,7 @@
 #ifndef VALUE_HOLDER_DWA20011215_HPP
 # define VALUE_HOLDER_DWA20011215_HPP
 
+# include <boost/python/object/value_holder_fwd.hpp>
 # include <boost/python/object/class.hpp>
 # include <boost/python/converter/type_id.hpp>
 # include <boost/python/object/inheritance.hpp>
@@ -140,8 +141,136 @@ struct value_holder : instance_holder
     Held m_held;
 };
 
+template <class Held,class BackReferenceType>
+struct value_holder_back_reference : instance_holder
+{
+    // Forward construction to the held object
+    value_holder_back_reference(PyObject* p)
+        : m_held() {}
+    
+    template <class A1>
+    value_holder_back_reference(PyObject* p, A1 a1)
+        : m_held(p
+            , (typename unwrap_reference<A1>::type&)(a1)
+            )
+    {}
+    
+    template <class A1, class A2>
+    value_holder_back_reference(PyObject* p, A1 a1, A2 a2)
+        : m_held(p
+            , (typename unwrap_reference<A1>::type&)(a1)
+            , (typename unwrap_reference<A2>::type&)(a2)
+            )
+    {}
+    
+    template <class A1, class A2, class A3>
+    value_holder_back_reference(PyObject* p, A1 a1, A2 a2, A3 a3)
+        : m_held(p
+            , (typename unwrap_reference<A1>::type&)(a1)
+            , (typename unwrap_reference<A2>::type&)(a2)
+            , (typename unwrap_reference<A3>::type&)(a3)
+            )
+    {}
+    
+    template <class A1, class A2, class A3, class A4>
+    value_holder_back_reference(PyObject* p, A1 a1, A2 a2, A3 a3, A4 a4)
+        : m_held(p
+            , (typename unwrap_reference<A1>::type&)(a1)
+            , (typename unwrap_reference<A2>::type&)(a2)
+            , (typename unwrap_reference<A3>::type&)(a3)
+            , (typename unwrap_reference<A4>::type&)(a4)
+            )
+    {}
+    
+    template <class A1, class A2, class A3, class A4, class A5>
+    value_holder_back_reference(PyObject* p, A1 a1, A2 a2, A3 a3, A4 a4, A5 a5)
+        : m_held(p
+            , (typename unwrap_reference<A1>::type&)(a1)
+            , (typename unwrap_reference<A2>::type&)(a2)
+            , (typename unwrap_reference<A3>::type&)(a3)
+            , (typename unwrap_reference<A4>::type&)(a4)
+            , (typename unwrap_reference<A5>::type&)(a5)
+            ) {}
+    
+    template <class A1, class A2, class A3, class A4, class A5, class A6>
+    value_holder_back_reference(PyObject* p, A1 a1, A2 a2, A3 a3, A4 a4, A5 a5, A6 a6)
+        : m_held(p
+            , (typename unwrap_reference<A1>::type&)(a1)
+            , (typename unwrap_reference<A2>::type&)(a2)
+            , (typename unwrap_reference<A3>::type&)(a3)
+            , (typename unwrap_reference<A4>::type&)(a4)
+            , (typename unwrap_reference<A5>::type&)(a5)
+            , (typename unwrap_reference<A6>::type&)(a6)
+            ) {}
+    
+    template <class A1, class A2, class A3, class A4, class A5, class A6, class A7>
+    value_holder_back_reference(PyObject* p, A1 a1, A2 a2, A3 a3, A4 a4, A5 a5, A6 a6, A7 a7)
+        : m_held(p
+            , (typename unwrap_reference<A1>::type&)(a1)
+            , (typename unwrap_reference<A2>::type&)(a2)
+            , (typename unwrap_reference<A3>::type&)(a3)
+            , (typename unwrap_reference<A4>::type&)(a4)
+            , (typename unwrap_reference<A5>::type&)(a5)
+            , (typename unwrap_reference<A6>::type&)(a6)
+            , (typename unwrap_reference<A7>::type&)(a7)
+            )
+    {}
+    
+    template <class A1, class A2, class A3, class A4, class A5, class A6, class A7, class A8>
+    value_holder_back_reference(PyObject* p, A1 a1, A2 a2, A3 a3, A4 a4, A5 a5, A6 a6, A7 a7, A8 a8)
+        : m_held(p
+            , (typename unwrap_reference<A1>::type&)(a1)
+            , (typename unwrap_reference<A2>::type&)(a2)
+            , (typename unwrap_reference<A3>::type&)(a3)
+            , (typename unwrap_reference<A4>::type&)(a4)
+            , (typename unwrap_reference<A5>::type&)(a5)
+            , (typename unwrap_reference<A6>::type&)(a6)
+            , (typename unwrap_reference<A7>::type&)(a7)
+            , (typename unwrap_reference<A8>::type&)(a8)
+            )
+    {}
+    
+    template <class A1, class A2, class A3, class A4, class A5, class A6, class A7, class A8, class A9>
+    value_holder_back_reference(PyObject* p, A1 a1, A2 a2, A3 a3, A4 a4, A5 a5, A6 a6, A7 a7, A8 a8, A9 a9)
+        : m_held(p
+            , (typename unwrap_reference<A1>::type&)(a1)
+            , (typename unwrap_reference<A2>::type&)(a2)
+            , (typename unwrap_reference<A3>::type&)(a3)
+            , (typename unwrap_reference<A4>::type&)(a4)
+            , (typename unwrap_reference<A5>::type&)(a5)
+            , (typename unwrap_reference<A6>::type&)(a6)
+            , (typename unwrap_reference<A7>::type&)(a7)
+            , (typename unwrap_reference<A8>::type&)(a8)
+            , (typename unwrap_reference<A9>::type&)(a9)
+            )
+    {}
+    
+    template <class A1, class A2, class A3, class A4, class A5, class A6, class A7, class A8, class A9, class A10>
+    value_holder_back_reference(PyObject* p, A1 a1, A2 a2, A3 a3, A4 a4, A5 a5, A6 a6, A7 a7, A8 a8, A9 a9, A10 a10)
+        : m_held(p
+            , (typename unwrap_reference<A1>::type&)(a1)
+            , (typename unwrap_reference<A2>::type&)(a2)
+            , (typename unwrap_reference<A3>::type&)(a3)
+            , (typename unwrap_reference<A4>::type&)(a4)
+            , (typename unwrap_reference<A5>::type&)(a5)
+            , (typename unwrap_reference<A6>::type&)(a6)
+            , (typename unwrap_reference<A7>::type&)(a7)
+            , (typename unwrap_reference<A8>::type&)(a8)
+            , (typename unwrap_reference<A9>::type&)(a9)
+            , (typename unwrap_reference<A10>::type&)(a10)
+            )
+    {}
+
+ private: // required holder implementation
+    void* holds(converter::undecorated_type_id_t);
+
+ private: // data members
+    BackReferenceType m_held;
+};
+
 // A generator metafunction which can be passed to make_holder
-struct value_holder_generator
+template <>
+struct value_holder_generator<no_back_reference>
 {
     template <class Held>
     struct apply
@@ -150,6 +279,16 @@ struct value_holder_generator
     };
 };
 
+template <class BackReferenceType>
+struct value_holder_generator
+{
+    template <class Held>
+    struct apply
+    {
+        typedef value_holder_back_reference<Held,BackReferenceType> type;
+    };
+};
+
 template <class Held>
 void* value_holder<Held>::holds(converter::undecorated_type_id_t dst_t)
 {
@@ -158,6 +297,23 @@ void* value_holder<Held>::holds(converter::undecorated_type_id_t dst_t)
         : find_static_type(&m_held, src_t, dst_t);
 }
 
+template <class Held, class BackReferenceType>
+void* value_holder_back_reference<Held,BackReferenceType>::holds(
+    converter::undecorated_type_id_t dst_t)
+{
+    converter::undecorated_type_id_t src_t = converter::undecorated_type_id<Held>();
+    if (src_t == dst_t)
+    {
+        Held* x = &m_held;
+        return x;
+    }
+
+    src_t = converter::undecorated_type_id<BackReferenceType>();
+    return src_t == dst_t
+        ? &m_held
+        :  find_static_type(&m_held, src_t, dst_t);
+}
+
 }}} // namespace boost::python::objects
 
 #endif // VALUE_HOLDER_DWA20011215_HPP
diff --git a/include/boost/python/object/value_holder_fwd.hpp b/include/boost/python/object/value_holder_fwd.hpp
new file mode 100644
index 00000000..6cb2a0f5
--- /dev/null
+++ b/include/boost/python/object/value_holder_fwd.hpp
@@ -0,0 +1,17 @@
+// Copyright David Abrahams 2002. Permission to copy, use,
+// modify, sell and distribute this software is granted provided this
+// copyright notice appears in all copies. This software is provided
+// "as is" without express or implied warranty, and with no claim as
+// to its suitability for any purpose.
+#ifndef VALUE_HOLDER_FWD_DWA2002311_HPP
+# define VALUE_HOLDER_FWD_DWA2002311_HPP
+
+namespace boost { namespace python { namespace objects { 
+
+struct no_back_reference;
+
+template <class CallbackType = no_back_reference> struct value_holder_generator;
+
+}}} // namespace boost::python::object
+
+#endif // VALUE_HOLDER_FWD_DWA2002311_HPP
diff --git a/src/object/class.cpp b/src/object/class.cpp
index b9deb98f..dc3a42af 100644
--- a/src/object/class.cpp
+++ b/src/object/class.cpp
@@ -169,9 +169,9 @@ find_instance_impl(PyObject* inst, converter::undecorated_type_id_t type)
     
     instance* self = reinterpret_cast<instance*>(inst);
 
-    for (instance_holder::iterator match(self->objects), end(0); match != end; ++match)
+    for (instance_holder* match = self->objects; match != 0; match = match->next())
     {
-        void* const found = (*match).holds(type);
+        void* const found = match->holds(type);
         if (found)
             return found;
     }