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#ifndef _SDR_OBJECTUSER_HXX
#define _SDR_OBJECTUSER_HXX

#include <vector>

////////////////////////////////////////////////////////////////////////////////////////////////////
// predeclarations
class SdrObject;

////////////////////////////////////////////////////////////////////////////////////////////////////
// To make things more safe, allow users of the page to register at it. The users need to be derived
// from sdr::PageUser to get a call. The users do not need to call RemovePageUser() at the page
// when they get called from PageInDestruction().

namespace sdr
{
    class ObjectUser
    {
    public:
        // this method is called form the destructor of the referenced page.
        // do all necessary action to forget the page. It is not necessary to call
        // RemovePageUser(), that is done form the destructor.
        virtual void ObjectInDestruction(const SdrObject& rObject) = 0;

    protected:
        ~ObjectUser() {}
    };

    // typedef for ObjectUserVector
    typedef ::std::vector< ObjectUser* > ObjectUserVector;
} // end of namespace sdr

////////////////////////////////////////////////////////////////////////////////////////////////////

#endif //_SDR_OBJECTUSER_HXX
// eof

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