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#ifndef ATTRIBUTESUBJECT_H
#define ATTRIBUTESUBJECT_H
#include <state_exports.h>
#include <AttributeGroup.h>
#include <Subject.h>

// ****************************************************************************
// Class: AttributeSubject
//
// Purpose:
//   This is a base class for state objects that can be transmitted
//   across a connection. It inherits an interface from Subject so it
//   can tell its observers when it changes.
//
// Notes:      
//
// Programmer: Brad Whitlock
// Creation:   Mon Aug 7 12:52:00 PDT 2000
//
// Modifications:
//   Kathleen Bonnell, Fri Oct 19 15:33:35 PDT 2001
//   Added virtual method VarChangeRequiresReset.
//
//   Brad Whitlock, Mon Feb 11 15:26:34 PST 2002
//   Added a new method to create compatible types.
//
//   Brad Whitlock, Wed Jul 23 11:15:49 PDT 2003
//   Added a new method to create a new instance that does not have to
//   be initialized from the calling object.
//
//   Kathleen Bonnell, Tue Jun 20 16:02:38 PDT 2006
//   Added virtual method TypeName so that derived classes can have their
//   names printed in log files. 
//
//   Burlen Loring, Thu Sep 24 11:35:22 PDT 2015
//   I removed a compiler warning.
//
// ****************************************************************************

class STATE_API AttributeSubject : public AttributeGroup, public Subject
{
public:
    AttributeSubject(const char *);
    virtual ~AttributeSubject();
    virtual void SelectAll() = 0;
    virtual const std::string TypeName() const; 
    virtual void Notify();
    virtual AttributeSubject *CreateCompatible(const std::string &) const;
    virtual AttributeSubject *NewInstance(bool) const { return 0; };

    virtual bool VarChangeRequiresReset(void) { return false; };
};

#endif
