FIX: No Error Given for Non-static Callback Member Function

MORE INFORMATION

Using a non-static member function as a callback function should trigger the compiler to generate the following error when the callback function is invoked: In C++ every callback function has its own prototype, which determines the parameters that the calling function can pass to the function. However, C++ member functions have a hidden parameter known as the 'this' pointer. C++ is able to associate a function with a particular instance of an object by means of the 'this' pointer. Therefore, if a callback function, defined as a non-static member function, is called, it will expect a particular instance of an object. On the first line of the Test::Test_Func() member function in the following sample code, there is no object instance when the callback function is invoked, so a C2643 compiler error should be generated.

For more information on writing C++ callback functions, please see the article "Calling All Members: Member Functions as Callbacks" on the Microsoft Development Network (MSDN) CD-ROM.

Sample Code to Reproduce Problem

   /* Compile options needed: default console application
   */ 
   #include <stdio.h>
   typedef void (__cdecl *lpCallback)();
   void Function1(lpCallback)
   {
   }
   class Test
   {
    public:
      void _cdecl BadCallBack();       // Non-static callback function
      static void _cdecl GoodCallBack(); // Static callback function
      void Test_Func();
   };
   void Test::Test_Func()
   {
     Function1(BadCallBack); // Line 20 : compiler doesn't generate C2643
     Function1(GoodCallBack);
   }
   void Test_Func()
   {
     Function1(Test::BadCallBack);  // Compiler correctly generates C2643
     Function1(Test::GoodCallBack);
   }
   void main()
   {
   }