CommandStack.h

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#ifndef _COMMANDSTACK_HEADER
#define _COMMANDSTACK_HEADER


#include "Command.h"
#include <list>


namespace ot
{


// class *CommandStack*
// *******************************************************************************************
// - stack for commands, implementing the command pattern for undo/redo functionality

class CommandStack : public std::list<Command*>
{
public:
        CommandStack(SpeechControlSource &parentSrc_);

        bool                                    push(Command *cmd);
        bool                                    undo();
        bool                                    redo();
        bool                                    extend();
        bool                                    again();
        Command*                                getUndoCmd()            { return *currentCmd; };
        Command*                                getRedoCmd()            { iterator tmp = currentCmd; return *(--tmp); };

protected:
        void                                    deleteAllAbove();

        iterator                                currentCmd;             // pointing to lastly performed command
        SpeechControlSource&    parentSrc;
};


} // namespace ot


#endif

---