IDocumentStateComparator.h

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// SPDX-License-Identifier: LGPL-2.1-or-later OR GPL-2.0-or-later OR GPL-3.0-or-later OR LicenseRef-ACF-Commercial
#pragma once
 
 
// ACF includes
#include <istd/IChangeable.h>
 
 
namespace idoc
{
 
 
class IDocumentStateComparator: virtual public istd::IChangeable
{
public:
       enum DocumentChangeFlag
       {
              DCF_UNKNOWN,
              
              DCF_EQUAL,
              
              DCF_DIFFERENT
       };
 
       virtual bool HasStoredDocumentState() const = 0;
       
       virtual bool StoreDocumentState() = 0;
       
       virtual bool RestoreDocumentState() = 0;
       
       virtual DocumentChangeFlag GetDocumentChangeFlag() const = 0;
};
 
 
} // namespace idoc