Hi,

Consider the following code:

---

template <class T>
class TMyCWndWrapper : public T
{
public:
    afx_msg void OnEnable(BOOL bEnable)
    {
        // For the sake of simplicity I'll just call the base class imp.
        T::OnEnable(bEnable);
    }

    DECLARE_MESSAGE_MAP()
};

// Define a custom template IMPLEMENT_MESSAGE_MAP
#define WND_TEMPLATE_IMPLEMENT_MESSAGE_MAP(baseClass) \
    BEGIN_MESSAGE_MAP(TMyCWndWrapper< baseClass >, baseClass) \
    ON_WM_ENABLE() \
END_MESSAGE_MAP()

WND_TEMPLATE_IMPLEMENT_MESSAGE_MAP( CListBox );
WND_TEMPLATE_IMPLEMENT_MESSAGE_MAP( CListCtrl );

---

This code compiles just fine in VC6.
In VC8, I get the following error:
error C2906: 'const AFX_MSGMAP
*TMyCWndWrapper<T>::GetThisMessageMap(void)' : explicit specialization
requires 'template <>'

So I went on and implemented my own BEGIN_TEMPLATE_MESSAGE_MAP and
added the "template <>" where needed.

When I compiled, I had a macro redefinition on
BEGIN_TEMPLATE_MESSAGE_MAP. It turns out that MFC already took care of
that, so I removed my implementation and used MFC's with the adjusted
line:
   BEGIN_TEMPLATE_MESSAGE_MAP(TMyCWndWrapper, baseClass , baseClass)

Now, if I define only the first line:
   WND_TEMPLATE_IMPLEMENT_MESSAGE_MAP( CListBox );

The code actually compiles, but if I add the other line:
   WND_TEMPLATE_IMPLEMENT_MESSAGE_MAP( CListCtrl );

Now I get the error:
error C2995: 'const AFX_MSGMAP *TMyCWndWrapper<T>::GetMessageMap(void)
const' : function template has already been defined.

My current status is that I re-implemented BEGIN_TEMPLATE_MESSAGE_MAP
as follows:

---
#undef BEGIN_TEMPLATE_MESSAGE_MAP
#define BEGIN_TEMPLATE_MESSAGE_MAP(theClass, type_name, baseClass) \
    PTM_WARNING_DISABLE \
    template <> \
    const AFX_MSGMAP* theClass< type_name >::GetMessageMap() const \
        { return GetThisMessageMap(); } \
        template <> \
        const AFX_MSGMAP* PASCAL theClass< type_name >::GetThisMessageMap() \
    { \
    typedef theClass< type_name > ThisClass; \
    typedef baseClass TheBaseClass; \
    static const AFX_MSGMAP_ENTRY _messageEntries[] = \
    {
---

The diff. between this one and MFC's is that I replaced:
      template < typename type_name >
with:
      template <>

---

The code now compiles just fine.
So, in case this helps someone, I'll be very happy.
Beyond that, if someone would like to explain what's going on here I
will be happy to receive an answer.
I don't understand what "template < typename type_name >" means.

   Cheers.