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+// file      : examples/cxx/serializer/polymorphism/supermen.hxx
+// author    : Boris Kolpackov <boris@codesynthesis.com>
+// copyright : not copyrighted - public domain
+
+#ifndef SUPERMEN_HXX
+#define SUPERMEN_HXX
+
+#include <string>
+#include <vector>
+
+// Custom type id. We could also use standard C++ typeid/type_info
+// if it is available.
+//
+enum type_id
+{
+  person_type,
+  superman_type,
+  batman_type
+};
+
+//
+//
+struct person
+{
+  virtual
+  ~person ()
+  {
+  }
+
+  person (const std::string& name)
+      : name_ (name)
+  {
+  }
+
+  const std::string&
+  name () const
+  {
+    return name_;
+  }
+
+  void
+  name (const std::string& n)
+  {
+    name_ = n;
+  }
+
+  virtual type_id
+  type () const
+  {
+    return person_type;
+  }
+
+private:
+  std::string name_;
+};
+
+//
+//
+struct superman: person
+{
+  superman (const std::string& name, bool can_fly)
+      : person (name), can_fly_ (can_fly)
+  {
+  }
+
+  bool
+  can_fly () const
+  {
+    return can_fly_;
+  }
+
+  void
+  can_fly (bool cf)
+  {
+    can_fly_ = cf;
+  }
+
+  virtual type_id
+  type () const
+  {
+    return superman_type;
+  }
+
+private:
+  bool can_fly_;
+};
+
+struct batman: superman
+{
+  batman (const std::string& name, unsigned int wing_span)
+      : superman (name, true), wing_span_ (wing_span)
+  {
+  }
+
+  unsigned int
+  wing_span () const
+  {
+    return wing_span_;
+  }
+
+  void
+  wing_span (unsigned int ws)
+  {
+    wing_span_ = ws;
+  }
+
+  virtual type_id
+  type () const
+  {
+    return batman_type;
+  }
+
+private:
+  unsigned int wing_span_;
+};
+
+// Poor man's polymorphic sequence which also assumes ownership of the
+// elements.
+//
+struct supermen: std::vector<person*>
+{
+  ~supermen ()
+  {
+    for (iterator i = begin (); i != end (); ++i)
+      delete *i;
+  }
+};
+
+#endif // SUPERMEN_HXX