////////////////////////////////////////////////////////////////
// Sample program illustrating 'hiding' problem when you override
// only one of a pair (or more) of overloaded virtual functions.
// This program generates a compiler error because the function
// test(void) in class D hides the function test(int) in class B.
//

#include <iostream.h>

class B {
private:
   int nNumber;
public:
    virtual void test() {
       cout << "B::test()\n";  } 
    virtual void test(int x) {  
       nNumber = x; // use the param in some fashion
       cout << "B::test(int x)\n";  
    }
};

class D : public B {
public:
//test(void) hides B::test(int)
    virtual void test() {
       cout << "D::test()\n";
    }

    // To fix the problem, remove comments below:
//    virtual void test(int x) {
//     B::test(x);
//  }
};

void main(int argc, char* argv[])
{
  D d;            // derived class instance
  d.test();       // OK
  d.test(17);     // generates compiler error.
}

////////////////////////////////////////////////////////////////
// MSDN Magazine — May 2002
// If this code works, it was written by Paul DiLascia.
// If not, I don't know who wrote it.
//
// This fragment shows how to change the style of a control by
// destroying and recreating it. This technique is required for
// styles that can't be modified after window/control has been
// created. In this example, I add LBS_OWNERDRAWFIXED to a listbox.
//

//////////////////
// Some dialog with a listbox
//
class CMyDialog : public CDialog {
protected:
   CListBox m_wndListBox;
   virtual BOOL OnInitDialog();
   •••
};

BOOL CMyDialog::OnInitDialog()
{
   // First, subclass the listbox the normal way.
   //
   m_wndListBox.SubclassDlgItem(IDC_LIST1,this);

   //
   // Modify listbox style to add LBS_OWNERDRAWFIXED. Since
   // Windows only looks at this style when the window is first
   // created, you must destroy/recreate the listbox.
   // 

   // Remember previous window for TAB order. (TAB order = Z order.)
   //
   CWnd *pWndPrev = m_wndListBox.GetWindow(GW_HWNDPREV);

   // Remember state. If you need to save the list items, current 
   // selected item and so on, don't forget to do that too!
   //
   UINT nID = m_wndListBox.GetDlgCtrlID();      // remember ID..
   DWORD dwStyle = m_wndListBox.GetStyle();     // style..
   DWORD dwStyleEx = m_wndListBox.GetExStyle(); // extended style..
   CRect rc;                                    // and position
   m_wndListBox.GetWindowRect(&rc);             // ..
   ScreenToClient(&rc);                         // (convert to client).
   m_wndListBox.DestroyWindow();                // destroy listbox
   dwStyle |= LBS_OWNERDRAWFIXED;               // add new style

   // Now recreate it!
   //
   m_wndListBox.CreateEx(dwStyleEx,
      "ListBox",  // (window class name)
      NULL,       // window text
      dwStyle,    // modified style
      rc,         // position
      this,       // parent window
      nID);       // control ID

   // Finally, restore original Z-order, which is same as TAB
   // order. This is important since otherwise the new listbox
   // will go to the end of the TAB order.
   //
   m_wndListBox.SetWindowPos(pWndPrev,0,0,0,0,SWP_NOMOVE|SWP_NOSIZE);

   •••

   return TRUE;
}