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+// file : examples/cxx/parser/polymorphism/supermen-pimpl.hxx
+// author : Boris Kolpackov <boris@codesynthesis.com>
+// copyright : not copyrighted - public domain
+
+#ifndef SUPERMEN_PIMPL_HXX
+#define SUPERMEN_PIMPL_HXX
+
+#include "supermen-pskel.hxx"
+
+class person_pimpl: public virtual person_pskel
+{
+public:
+ virtual void
+ pre ();
+
+ virtual void
+ name (const std::string&);
+
+ virtual void
+ post_person ();
+};
+
+class superman_pimpl: public virtual superman_pskel,
+ public person_pimpl
+{
+public:
+ virtual void
+ pre ();
+
+ virtual void
+ can_fly (bool);
+
+ // By default, post_superman() calls post_person(). In case of
+ // polymorphic parsing we want the opposite: post_person() calls
+ // post_superman().
+ //
+ virtual void
+ post_person ();
+
+ virtual void
+ post_superman ();
+};
+
+class batman_pimpl: public virtual batman_pskel,
+ public superman_pimpl
+{
+public:
+ virtual void
+ pre ();
+
+ virtual void
+ wing_span (unsigned int);
+
+ // By default, post_batman() calls post_superman(). In case of
+ // polymorphic parsing we want the opposite: post_superman()
+ // calls post_batman().
+ //
+ virtual void
+ post_superman ();
+
+ virtual void
+ post_batman ();
+};
+
+class supermen_pimpl: public supermen_pskel
+{
+};
+
+#endif // SUPERMEN_PIMPL_HXX