PRM/PRM_Value.h

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/*
 * PROPRIETARY INFORMATION.  This software is proprietary to
 * Side Effects Software Inc., and is not to be reproduced,
 * transmitted, or disclosed in any way without written permission.
 *
 * Produced by:
 *      Luke Moore
 *      Side Effects
 *      477 Richmond Street West
 *      Toronto, Ontario
 *      Canada   M5V 3E7
 *      416-504-9876
 *
 * NAME:        PRM_Value.h
 *
 * COMMENTS:
 *
 */

#ifndef __PRM_Value_h__
#define __PRM_Value_h__

#include "PRM_API.h"
#include <UT/UT_Defines.h>
#include <UT/UT_PtrArray.h>

class PRM_Parm;
class PRM_EventHandler;

typedef void    (*PRM_ValueCallback)(void *callee, void *value);

class PRM_API PRM_Value
{
public:
    PRM_Value();
    PRM_Value(const PRM_Value &src);
    ~PRM_Value();

    void                    addInterest(void *callee,
                                        PRM_ValueCallback callback);
    void                 removeInterest(void *callee,
                                        PRM_ValueCallback callback);
    bool                    hasInterest(void *callee) const;


    void                 changed();

          void           setValue(void *value)  { myValue = value; }
    PRM_Value           &operator=(void *value)
                                            { myValue = value; return *this; }

          void          *getValue()             { return myValue; }
    const void          *getValue() const       { return myValue; }
    operator             void*()                { return myValue; }
    operator const       void*() const          { return myValue; }

    int64                getMemUsage(UT_Bool onlythis) const;

private:
    void                *myValue;
    UT_PtrArray<PRM_EventHandler *>      myHandlers;
};

#endif

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