[C++]Problema classe

[Luc@s]

// IWindget.h

#ifndef IWINDGET_H_
#define IWINDGET_H_
#include "Define.h"

NAMESPACE_BEGIN

/*
  Name: IWindget
  Author: Kleidemos
  Description: An abstract class for Windget
*/

class IWindget
{
        public:
            IWindget(){};
            virtual ~IWindget(){};
            virtual void setName(string name){};
            virtual void setLocation(int x, int y){};
            virtual void setDimension(int x, int y){};
            virtual void display(IWindget * pFrame){};
            void Add(IWindget * pFrame) const;
            void Remove(IWindget * pFrame) const;
            IWindget& operator=(const IWindget& aWindget);
            IWindget& operator+=(const IWindget& aWindget);
            IWindget& operator-=(const IWindget& aWindget);
};

NAMESPACE_END

#endif // IWINDGET_H_

// IWindget.cpp

#include "IWindget.h"

NAMESPACE_BEGIN
/*
    Add a Form
*/
void IWindget::Add(IWindget * pFrame) const
{
    pFrame->display(pFrame);
}

/*
    Remove a form
*/
void IWindget::Remove(IWindget * pFrame) const
{
    // TODO
}

/*
    The equal operator
*/
IWindget& IWindget::operator=(const IWindget& aWindget)
{
    if(this == &aWindget) // Check addresses, if equal
        return *this;
    return *this;    
}
/*
    The addition operator
*/
IWindget& IWindget::operator+=(const IWindget& aWindget)
{
    aWindget.Add(&aWindget);
    return *this;    
}
/*
    The substraction operator
*/
IWindget& IWindget::operator-=(const IWindget& aWindget)
{
    return *this;    
}

NAMESPACE_END

Ma compilandolo mi da:

C:/Documents and Settings/Luca/Documenti/Astraz/IWindget.cpp: In member
function `Utils::IWindget& Utils::IWindget::operator+=(const
Utils::IWindget&)':
C:/Documents and Settings/Luca/Documenti/Astraz/IWindget.cpp:36: invalid
conversion from `const Utils::IWindget*' to `Utils::IWindget*'
C:/Documents and Settings/Luca/Documenti/Astraz/IWindget.cpp:36: initializing
argument 1 of `void Utils::IWindget::Add(Utils::IWindget*) const'

Execution terminated

Help meeeeeeeeeeee

[cionci]

Il parametro che passi ad Add è const, ma nella dichirazione di Add il parametro non è dichiarato const... Di conseguenza si suppone che possa venire modificato all'interno di Add...che è in contrasto con il parametro const passato...