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diff --git a/common/polymorphism/test6.hxx b/common/polymorphism/test6.hxx
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+++ b/common/polymorphism/test6.hxx
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+// file      : common/polymorphism/test6.hxx
+// copyright : Copyright (c) 2009-2012 Code Synthesis Tools CC
+// license   : GNU GPL v2; see accompanying LICENSE file
+
+#ifndef TEST6_HXX
+#define TEST6_HXX
+
+#include <string>
+#include <memory>
+
+#include <odb/core.hxx>
+#include <odb/callback.hxx>
+
+// Test polymorphism and callbacks.
+//
+#pragma db namespace table("t6_")
+namespace test6
+{
+  #pragma db object polymorphic pointer(std::auto_ptr)
+  struct root
+  {
+    virtual ~root () {}
+    root (): id (0) {}
+    root (unsigned long i, unsigned long n): id (i), num (n) {}
+
+    #pragma db id
+    unsigned long id;
+
+    unsigned long num;
+  };
+
+  #pragma db object callback(db_callback)
+  struct base: root
+  {
+    base () {}
+    base (unsigned long i, unsigned long n, const std::string& s)
+        : root (i, n), str (s) {}
+
+    std::string str;
+
+    void
+    db_callback (odb::callback_event, odb::database&);
+
+    void
+    db_callback (odb::callback_event, odb::database&) const;
+  };
+
+  #pragma db object callback(db_callback)
+  struct derived: base
+  {
+    derived () {}
+    derived (unsigned long i, unsigned long n, const std::string& s)
+        : base (i, n, s), dnum (n + 1), dstr (s + 'd') {}
+
+    unsigned long dnum;
+    std::string dstr;
+
+    std::auto_ptr<root> ptr;
+
+    void
+    db_callback (odb::callback_event, odb::database&) const;
+  };
+}
+
+#endif // TEST6_HXX