C / C++ / MFC

xyz is a function
   its first parameter is of type int
   its second parameter is of type
        pointer to function
            with one parameter of type int
            returning void
   returning
        pointer to function
            with one parameter of type int
            returning void

CMyDialog::callbackfunction(... , LPVOID pointer)

callbackfuntionc(...,this);

CMyDialog::callbackfunction(... , LPVOID pointer)
{
   CMyDialog *pMain=(CMyDialog*)pointer;
   pMain->m_variable=0;  // here you can access them...
}

class CBookmarks 
{
public:
    void   ScanBookmarks( void (CBookmarks::*Scan_Func)( const BMRK, const ulong, const ulong ), const ulong var1, const ulong var2, const LN_NUM ln_num );
};

// Function definition
void
CBookmarks::ScanBookmarks( void (CBookmarks::*Scan_Func)( const BMRK, const ulong, const ulong ), const ulong var1, const ulong var2, const LN_NUM ln_num )
{
}

// Function using callback.
bits
CBookmarks::ClmChanged( const LN_NUM ln_num, const LN_CLM clm, const int dir )
{
    m_changed_bookmarks = 0x00;
    ScanBookmarks( _ClmChanged, clm, dir, ln_num );
    return m_changed_bookmarks;
}

// Callback function
void
CBookmarks::_ClmChanged( const BMRK mp, const LN_CLM clm, const ulong dir )
{
    if ( mp->m_ln_clm >= clm )
    {
	mp->m_ln_clm += dir;
        MASKON( mp->m_status, MOVED );    // flag that the bookmark has moved
        BITON( m_changed_bookmarks, mp - m_bookmarks );
        mp->m_ln_oclm = MARK_OFF;       // reset as no longer valid
    }
}