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diff --git a/odb-tests/common/inheritance/polymorphism/test5.hxx b/odb-tests/common/inheritance/polymorphism/test5.hxx
new file mode 100644
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+++ b/odb-tests/common/inheritance/polymorphism/test5.hxx
@@ -0,0 +1,92 @@
+// file      : common/inheritance/polymorphism/test5.hxx
+// license   : GNU GPL v2; see accompanying LICENSE file
+
+#ifndef TEST5_HXX
+#define TEST5_HXX
+
+#include <string>
+#include <vector>
+#include <memory>
+#include <typeinfo>
+
+#include <odb/core.hxx>
+
+// Test polymorphism and optimistic concurrency.
+//
+#pragma db namespace table("t5_")
+namespace test5
+{
+  #pragma db object polymorphic optimistic pointer(std::unique_ptr)
+  struct root
+  {
+    virtual ~root () {}
+    root () {}
+    root (unsigned long i, unsigned long n): id (i), num (n) {}
+
+    #pragma db id
+    unsigned long id;
+
+    #pragma db version
+    unsigned long version;
+
+    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 && version == r.version &&
+        num == r.num && strs == r.strs;
+    }
+  };
+
+  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
+  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;
+
+    virtual bool
+    compare (const root& r, bool tc = true) const
+    {
+      if (tc && typeid (r) != typeid (derived))
+        return false;
+
+      const derived& d (static_cast<const derived&> (r));
+      return base::compare (r, false) && dnum == d.dnum && dstr == d.dstr;
+    }
+  };
+}
+
+#endif // TEST5_HXX