BUG: Fixed implementation of auto_ptr_ref.

auto_ptr.hxx.in

@@ -48,9 +48,8 @@ public:
   void reset(X* p=0) throw() { if(get() != p) { delete get(); x_ = p; } }
 
   auto_ptr(auto_ptr_ref<X> r) throw(): x_(r.p_.release()) {}
-  template <class Y> operator auto_ptr_ref<Y>() throw() { return *this; }
+  template <class Y> operator auto_ptr_ref<Y>() throw() { return auto_ptr_ref<Y>(*this); }
   template <class Y> operator auto_ptr<Y>() throw() { return release(); }
-  auto_ptr& operator=(auto_ptr_ref<X> r) throw() { x_ = r.p_.release(); return *this; }
 };
 
 } // namespace @KWSYS_NAMESPACE@