Common.h

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#pragma once
 
namespace FuncDoodle {
    class Action {
        public:
        virtual void Undo() = 0;

        virtual void Redo() = 0;

        virtual ~Action() = default;
 
        // stopped adding friends because that is unnecessary
        // friend class DrawAction;
        // friend class FillAction;
        // friend class DeleteFrameAction;
    };
}  // namespace FuncDoodle