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diff --git a/libodb/odb/lazy-ptr.txx b/libodb/odb/lazy-ptr.txx
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+++ b/libodb/odb/lazy-ptr.txx
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+// file      : odb/lazy-ptr.txx
+// license   : GNU GPL v2; see accompanying LICENSE file
+
+namespace odb
+{
+  //
+  // lazy_ptr
+  //
+
+  template <class T>
+  template <class Y>
+  bool lazy_ptr<T>::
+  equal (const lazy_ptr<Y>& r) const
+  {
+    bool t1 ((p_ == 0) == loaded ());
+    bool t2 ((r.p_ == 0) == r.loaded ());
+
+    // If both are transient, then compare the underlying pointers.
+    //
+    if (t1 && t2)
+      return p_ == r.p_;
+
+    // If one is transient and the other is persistent, then compare
+    // the underlying pointers but only if they are non NULL. Note
+    // that an unloaded persistent object is always unequal to a
+    // transient object.
+    //
+    if (t1 || t2)
+      return p_ == r.p_ && p_ != 0;
+
+    // If both objects are persistent, then we compare databases and
+    // object ids.
+    //
+    typedef typename object_traits<T>::object_type object_type1;
+    typedef typename object_traits<Y>::object_type object_type2;
+
+    return i_.database () == r.i_.database () &&
+      object_id<object_type1> () == r.template object_id<object_type2> ();
+  }
+
+#ifdef ODB_CXX11
+
+  //
+  // lazy_unique_ptr
+  //
+
+  template <class T, class D>
+  template <class T1, class D1>
+  bool lazy_unique_ptr<T, D>::
+  equal (const lazy_unique_ptr<T1, D1>& r) const
+  {
+    bool t1 (!p_ == loaded ());
+    bool t2 (!r.p_ == r.loaded ());
+
+    // If both are transient, then compare the underlying pointers.
+    //
+    if (t1 && t2)
+      return p_ == r.p_;
+
+    // If one is transient and the other is persistent, then compare
+    // the underlying pointers but only if they are non NULL. Note
+    // that an unloaded persistent object is always unequal to a
+    // transient object.
+    //
+    if (t1 || t2)
+      return p_ == r.p_ && p_;
+
+    // If both objects are persistent, then we compare databases and
+    // object ids.
+    //
+    typedef typename object_traits<T>::object_type object_type1;
+    typedef typename object_traits<T1>::object_type object_type2;
+
+    return i_.database () == r.i_.database () &&
+      object_id<object_type1> () == r.template object_id<object_type2> ();
+  }
+
+  //
+  // lazy_shared_ptr
+  //
+
+  template <class T>
+  template <class Y>
+  bool lazy_shared_ptr<T>::
+  equal (const lazy_shared_ptr<Y>& r) const
+  {
+    bool t1 (!p_ == loaded ());
+    bool t2 (!r.p_ == r.loaded ());
+
+    // If both are transient, then compare the underlying pointers.
+    //
+    if (t1 && t2)
+      return p_ == r.p_;
+
+    // If one is transient and the other is persistent, then compare
+    // the underlying pointers but only if they are non NULL. Note
+    // that an unloaded persistent object is always unequal to a
+    // transient object.
+    //
+    if (t1 || t2)
+      return p_ == r.p_ && p_;
+
+    // If both objects are persistent, then we compare databases and
+    // object ids.
+    //
+    typedef typename object_traits<T>::object_type object_type1;
+    typedef typename object_traits<Y>::object_type object_type2;
+
+    return i_.database () == r.i_.database () &&
+      object_id<object_type1> () == r.template object_id<object_type2> ();
+  }
+#endif // ODB_CXX11
+
+}