Casting Overloaded Function Pointer Problem...

[Don Mies <dmies at bluekite dot com>]

Gentlemen,

I've been trying to compile a version of the Microsoft MFC library
with the g++ compiler and have run into a problem that I don't know
how to resolve.

Here is a highly condensed test file that shows the problem.

--------------------------------------------
     1
     2  class CCmdTarget;
     3  class CWnd;
     4  class CRecordView;
     5
     6  typedef int (CCmdTarget::*PMSG)(int);
     7
     8  class CCmdTarget {};
     9
    10
    11  class CWnd : public CCmdTarget
    12  {
    13    public:
    14      int OnMove (int x, int y);
    15  };
    16
    17
    18  class CRecordView : public CWnd
    19  {
    20    public:
    21      int OnMove (int);
    22    protected:
    23      void OnMove (int cx, int cy);
    24    private:
    25      static const PMSG _messageEntries[];
    26  };
    27
    28
    29  ////////////////////////////////////////////////////////////
    30
    31  const PMSG CRecordView::_messageEntries[] =
    32  {
    33      (PMSG)&CRecordView::OnMove
    34  };

  ----------------------------------------
 
If I compile the above with the Sun CC compiler, I get no complaints
or warnings.  When I compile it with g++ (gcc version 2.95.2 19991024
(release)) I get the following error messages:

    t.C:34: no matches converting function `OnMove' to type `int (CCmdTarget::*)(int)'
    t.C:21: candidates are: int CRecordView::OnMove(int)
    t.C:23:                 void CRecordView::OnMove(int, int)

If I comment out the overloaded function declaration at line 23, it will compile
with no errors.

The compiler appears to be ignoring the cast operator at line 33 when it determines
the function signature or there is a problem because of the downcasting of the function
class.

Is there a way to fix this without making major changes to the source files (I don't understand
the MFC library well enough to make changes to it)?

Thank you,
 

Don Mies

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