C / C++ / MFC

CEdit
  A
  |
  |
CParsedEdit
  A
  |
  |
CParsedEditExport (for custom controls) 

CEdit   IEdit(abstract as interface)
  A     A
  |    /
  |   /
CParsedEdit
  A
  |
  |
CParsedEditExport (for custom controls) 

class IEdit {
public:
        virtual void setText(TCHAR* text)=0;
	virtual int getText(TCHAR* text, int count)=0;
};


class CParsedEdit : public IEdit, public CEdit {
public:
	virtual void setText(TCHAR* text) { SetWindowText(text); }
	virtual int getText(TCHAR* text, int count) { return GetWindowText(text, count); }
protected:
....
};

class CWclsEditDlg : public CDialog {
public:
	IEdit*  Edit1()
				{ return dynamic_cast<IEdit*>(GetDlgItem(IDC_EDIT1)); }
	IEdit*  Edit2()
				{ return dynamic_cast<IEdit*>(GetDlgItem(IDC_EDIT2)); }
	IEdit*  Edit3()
				{ return dynamic_cast<IEdit*>(GetDlgItem(IDC_EDIT3)); }
	IEdit*  Edit4()
				{ return dynamic_cast<IEdit*>(GetDlgItem(IDC_EDIT4)); }
....
};