C / C++ / MFC

#ifndef _QWORD_DEFINED
#define _QWORD_DEFINED
typedef __int64 QWORD, *LPQWORD;
#endif

#ifndef MAKEQWORD
#define MAKEQWORD(a, b)	\
	((QWORD)( ((QWORD) ((DWORD) (a))) << 32 | ((DWORD) (b))))
#define LODWORD(l) \
	((DWORD)(l))
#define HIDWORD(l) \
	((DWORD)(((QWORD)(l) >> 32) & 0xFFFFFFFF))
#endif

void NiceRectangle::SetWidth(unsigned newWidth)
{
   width = newWidth;
   // Do other stuff here...
}

Acutura wrote:

It is a solution, but it os not very convenient.

Acutura wrote:

You change value of a property and change is instantly displayed.

Acutura wrote:

It is a solution, but it os not very convenient.

Acutura wrote:

I prefer the way it works in DELPHI. You change value of a property and change is instantly displayed.

class NiceRectangle;

class RectWidth
{
  NiceRectangle * _pParent;
  int _iWidth;
public:
  RectWidth():_iWidth(0), _pParent(NULL){}
  RectWidth (NiceRectangle * pParent):_pParent(pParent),_iWidth(0){}

  RectWidth & operator = (int i);
  
  operator int(){ return _iWidth;}
};

class NiceRectangle
{
public:
  NiceRectangle():width(this){}
  RectWidth width;
  void OnWidthChange(){printf("new width is %d\n", (int) width);}
};


RectWidth & RectWidth::operator = (int i)
{
    _iWidth = i;
    _pParent->OnWidthChange();
    return *this;
}


void main()
{
  NiceRectangle nr;
  nr.width = 100;
}

Acutura wrote:

That`s exactly what i needed!

But I don`t think I`ll use it. Just, too much writing.

Acutura wrote:

And when I assign 100 to nRect.width I want to perform instructions:
width = 100;
ShowDisplay(dispHand);
DrawFrame(width, height, Black);

NiceRectangle::UpdateTheGUIOnRectWidthChange(int iNewWidth)
{
 //...
}

tasumisra wrote:

whats the advantage of inheritence over template...