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diff --git a/common/inheritance/polymorphism/test9.hxx b/common/inheritance/polymorphism/test9.hxx
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+++ b/common/inheritance/polymorphism/test9.hxx
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+// file      : common/inheritance/polymorphism/test9.hxx
+// copyright : Copyright (c) 2009-2012 Code Synthesis Tools CC
+// license   : GNU GPL v2; see accompanying LICENSE file
+
+#ifndef TEST9_HXX
+#define TEST9_HXX
+
+#include <string>
+#include <vector>
+#include <typeinfo>
+
+#include <odb/core.hxx>
+
+// Test polymorphism and readonly classes.
+//
+#pragma db namespace table("t9_")
+namespace test9
+{
+  //
+  // ro_root, rw_base, ro_derived
+  //
+  #pragma db object polymorphic readonly
+  struct ro_root
+  {
+    virtual ~ro_root () {}
+    ro_root () {}
+    ro_root (unsigned long i, unsigned long n): id (i), num (n) {}
+
+    #pragma db id
+    unsigned long id;
+
+    unsigned long num;
+    std::vector<std::string> strs;
+
+    virtual bool
+    compare (const ro_root& r, bool tc = true) const
+    {
+      if (tc && typeid (r) != typeid (ro_root))
+        return false;
+
+      return id == r.id && num == r.num && strs == r.strs;
+    }
+  };
+
+  inline bool
+  operator== (const ro_root& x, const ro_root& y) {return x.compare (y);}
+
+  #pragma db object
+  struct rw_base: ro_root
+  {
+    rw_base () {}
+    rw_base (unsigned long i, unsigned long n, const std::string& s)
+        : ro_root (i, n), str (s) {}
+
+    std::string str;
+    std::vector<unsigned long> nums;
+
+    virtual bool
+    compare (const ro_root& r, bool tc = true) const
+    {
+      if (tc && typeid (r) != typeid (rw_base))
+        return false;
+
+      const rw_base& b (static_cast<const rw_base&> (r));
+      return ro_root::compare (r, false) && str == b.str && nums == b.nums;
+    }
+  };
+
+  #pragma db object readonly
+  struct ro_derived: rw_base
+  {
+    ro_derived () {}
+    ro_derived (unsigned long i, unsigned long n, const std::string& s)
+        : rw_base (i, n, s), dnum (n + 1), dstr (s + 'd') {}
+
+    unsigned long dnum;
+    std::string dstr;
+
+    virtual bool
+    compare (const ro_root& r, bool tc = true) const
+    {
+      if (tc && typeid (r) != typeid (ro_derived))
+        return false;
+
+      const ro_derived& d (static_cast<const ro_derived&> (r));
+      return rw_base::compare (r, false) && dnum == d.dnum && dstr == d.dstr;
+    }
+  };
+
+  //
+  // rw_root, ro_base, rw_derived
+  //
+  #pragma db object polymorphic
+  struct rw_root
+  {
+    virtual ~rw_root () {}
+    rw_root () {}
+    rw_root (unsigned long i, unsigned long n): id (i), num (n) {}
+
+    #pragma db id
+    unsigned long id;
+
+    unsigned long num;
+    std::vector<std::string> strs;
+
+    virtual bool
+    compare (const rw_root& r, bool tc = true) const
+    {
+      if (tc && typeid (r) != typeid (rw_root))
+        return false;
+
+      return id == r.id && num == r.num && strs == r.strs;
+    }
+  };
+
+  inline bool
+  operator== (const rw_root& x, const rw_root& y) {return x.compare (y);}
+
+  #pragma db object readonly
+  struct ro_base: rw_root
+  {
+    ro_base () {}
+    ro_base (unsigned long i, unsigned long n, const std::string& s)
+        : rw_root (i, n), str (s) {}
+
+    std::string str;
+    std::vector<unsigned long> nums;
+
+    virtual bool
+    compare (const rw_root& r, bool tc = true) const
+    {
+      if (tc && typeid (r) != typeid (ro_base))
+        return false;
+
+      const ro_base& b (static_cast<const ro_base&> (r));
+      return rw_root::compare (r, false) && str == b.str && nums == b.nums;
+    }
+  };
+
+  #pragma db object
+  struct rw_derived: ro_base
+  {
+    rw_derived () {}
+    rw_derived (unsigned long i, unsigned long n, const std::string& s)
+        : ro_base (i, n, s), dnum (n + 1), dstr (s + 'd') {}
+
+    unsigned long dnum;
+    std::string dstr;
+
+    virtual bool
+    compare (const rw_root& r, bool tc = true) const
+    {
+      if (tc && typeid (r) != typeid (rw_derived))
+        return false;
+
+      const rw_derived& d (static_cast<const rw_derived&> (r));
+      return ro_base::compare (r, false) && dnum == d.dnum && dstr == d.dstr;
+    }
+  };
+}
+
+#endif // TEST9_HXX