C / C++ / MFC

<br />
CRect btnRect;<br />
btn1.GetWindowRect(btnRect);<br />
<br />
::SetWindowPos(btn1.m_hwnd, btnRect.left, btnRect.top, btnRect.Width(), btnRect.Height(), SWP_SHOWWINDOW); <br />

// This code fails on VS.NET 2003 (VC++) with a error.
//
// error C2511: 'MyBase2 *MyDerived::Copy(void)' :
// overloaded member function not found in 'MyDerived'
//
// Removing the 'const' qualifiers fixes the problem.

class MyBase
{
public:
   MyBase()  {}
   virtual ~MyBase()  {}

   virtual MyBase *Copy() const
   {
     return new MyBase(*this);
   }
};

class MyBase2
{
public:
   MyBase2()  {}
   virtual ~MyBase2()  {}

   virtual MyBase2 *Copy() const
   {
     return new MyBase2(*this);
   }
};

class MyDerived : public MyBase, public MyBase2
{
public:
   MyDerived()  {}
   virtual ~MyDerived()  {}

   virtual MyDerived *Copy() const
   {
     return new MyDerived(*this);
   }
};

int main()
{
  return 0;
}