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diff --git a/odb/session.ixx b/odb/session.ixx
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+// file      : odb/session.ixx
+// author    : Boris Kolpackov <boris@codesynthesis.com>
+// copyright : Copyright (c) 2009-2010 Code Synthesis Tools CC
+// license   : GNU GPL v2; see accompanying LICENSE file
+
+#include <odb/exceptions.hxx>
+
+namespace odb
+{
+  template <typename T>
+  inline void session::
+  erase (const object_position<T>& p)
+  {
+    // @@ Empty maps are not cleaned up by this version of erase.
+    //
+    p.map_->erase (p.pos_);
+  }
+
+  //
+  // object_pointers
+  //
+  template <typename T>
+  inline session::object_pointers<T>::
+  object_pointers () : p_ (), cp_ () {}
+
+  template <typename T>
+  inline void session::object_pointers<T>::
+  set (const pointer_type& p)
+  {
+    p_ = p;
+    cp_ = const_pointer_type ();
+  }
+
+  template <typename T>
+  inline void session::object_pointers<T>::
+  set (const const_pointer_type& cp)
+  {
+    p_ = pointer_type ();
+    cp_ = cp;
+  }
+
+  template <typename T>
+  inline void session::object_pointers<T>::
+  get (pointer_type& p) const
+  {
+    if (!pointer_traits<pointer_type>::null_ptr (p_))
+      p = p_;
+    else if (!pointer_traits<const_pointer_type>::null_ptr (cp_))
+      throw const_object ();
+    else
+      p = pointer_type ();
+  }
+
+  template <typename T>
+  inline void session::object_pointers<T>::
+  get (const_pointer_type& cp) const
+  {
+    if (!pointer_traits<pointer_type>::null_ptr (p_))
+      cp = const_pointer_type (p_);
+    else if (!pointer_traits<const_pointer_type>::null_ptr (cp_))
+      cp = cp_;
+    else
+      cp = const_pointer_type ();
+  }
+}