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diff --git a/common/inheritance/polymorphism/test8.hxx b/common/inheritance/polymorphism/test8.hxx
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+++ b/common/inheritance/polymorphism/test8.hxx
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+// file      : common/inheritance/polymorphism/test8.hxx
+// copyright : Copyright (c) 2009-2012 Code Synthesis Tools CC
+// license   : GNU GPL v2; see accompanying LICENSE file
+
+#ifndef TEST8_HXX
+#define TEST8_HXX
+
+#include <string>
+#include <vector>
+#include <typeinfo>
+
+#include <odb/core.hxx>
+
+// Test polymorphism and abstract bases.
+//
+#pragma db namespace table("t8_")
+namespace test8
+{
+  #pragma db object polymorphic
+  struct root
+  {
+    virtual ~root () = 0; // Auto-abstract.
+    root () {}
+    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 root& r, bool tc = true) const
+    {
+      if (tc && typeid (r) != typeid (root))
+        return false;
+
+      return id == r.id && num == r.num && strs == r.strs;
+    }
+  };
+
+  inline root::
+  ~root () {}
+
+  inline bool
+  operator== (const root& x, const root& y) {return x.compare (y);}
+
+  #pragma db object
+  struct base: root
+  {
+    base () {}
+    base (unsigned long i, unsigned long n, const std::string& s)
+        : root (i, n), str (s) {}
+
+    std::string str;
+    std::vector<unsigned long> nums;
+
+    virtual bool
+    compare (const root& r, bool tc = true) const
+    {
+      if (tc && typeid (r) != typeid (base))
+        return false;
+
+      const base& b (static_cast<const base&> (r));
+      return root::compare (r, false) && str == b.str && nums == b.nums;
+    }
+  };
+
+  #pragma db object abstract
+  struct interm: base
+  {
+    interm () {}
+    interm (unsigned long i, unsigned long n, const std::string& s, bool b)
+        : base (i, n, s), bln (b) {}
+
+    bool bln;
+
+    virtual bool
+    compare (const root& r, bool tc = true) const
+    {
+      if (tc && typeid (r) != typeid (interm))
+        return false;
+
+      const interm& i (static_cast<const interm&> (r));
+      return base::compare (r, false) && bln == i.bln;
+    }
+  };
+
+  #pragma db object
+  struct derived1: interm
+  {
+    derived1 () {}
+    derived1 (unsigned long i, unsigned long n, const std::string& s, bool b)
+        : interm (i, n, s, b), dnum (n + 1) {}
+
+    unsigned long dnum;
+
+    virtual bool
+    compare (const root& r, bool tc = true) const
+    {
+      if (tc && typeid (r) != typeid (derived1))
+        return false;
+
+      const derived1& d (static_cast<const derived1&> (r));
+      return interm::compare (r, false) && dnum == d.dnum;
+    }
+  };
+
+  #pragma db object
+  struct derived2: interm
+  {
+    derived2 () {}
+    derived2 (unsigned long i, unsigned long n, const std::string& s, bool b)
+        : interm (i, n, s, b), dstr (s + 'd') {}
+
+    std::string dstr;
+
+    virtual bool
+    compare (const root& r, bool tc = true) const
+    {
+      if (tc && typeid (r) != typeid (derived2))
+        return false;
+
+      const derived2& d (static_cast<const derived2&> (r));
+      return interm::compare (r, false) && dstr == d.dstr;
+    }
+  };
+}
+
+#endif // TEST8_HXX