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// Copyright (C) 1995 The New York Group Theory Cooperative
// See magnus/doc/COPYRIGHT for the full notice.
// Contents: Declaration of interface class ARC
//
// Principal Author: Roger Needham
//
// Status: complete
//
// Revision History:
//
#ifndef _ARC_H_
#define _ARC_H_
#include <iostream.h>
//---------------------------------------------------------------------------//
//------------------------------- ARC ---------------------------------------//
//---------------------------------------------------------------------------//
class ARC
{
public:
ARC( ) : theARC( 0 ) { }
operator int ( ) const { return theARC; }
ARC operator + ( const ARC& arc ) const {
return ARC( theARC + arc.theARC );
}
ARC operator - ( const ARC& arc ) const {
return ARC( theARC - arc.theARC );
}
ARC operator += ( const ARC& arc ) {
theARC += arc.theARC;
return *this;
}
ARC operator -= ( const ARC& arc ) {
theARC -= arc.theARC;
return *this;
}
inline friend ostream& operator << ( ostream& ostr, const ARC& arc ) {
return ostr << arc.theARC;
}
protected:
friend class ComputationManager;
friend class Supervisor;
ARC( int i ) : theARC( i ) { }
// Used by classes ComputationManager, Supervisor.
private:
int theARC;
};
struct ZeroARC : public ARC { ZeroARC( ) : ARC( 0 ) { } };
struct OneARC : public ARC { OneARC( ) : ARC( 1 ) { } };
#endif
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