BUG: C2511 Error on Member Function with Unknown Parameter

• Microsoft C/C++ Compiler (CL.EXE), included with:

      - Microsoft C/C++ for MS-DOS, version 7.0
      - Microsoft Visual C++ for Windows, versions 1.0, 1.5, and 1.51
      - Microsoft Visual C++, 32-bit Edition, versions 1.0 and 2.0
  

SYMPTOMS

Class functions defined using an unknown data type as a parameter will cause the C/C++ compiler to generate the following incorrect error:

   error C2511: 'Reg' : overloaded member function not found in 'Test'

RESOLUTION

There are two possible workarounds to this problem. Using the Sample Code below, you would:

• Make the function inline by placing the executable code in the class definition, as in this example:

        class MyClass
        {
           int Reg(const int *a, struct T *t) {return 0;};
        };
  
     -or-
  
  

• Define the unknown data type before the class definition, as in this example:

        struct T
        {
           int q;
        };
  
        class Test
        {
           int Reg(const int *a, struct T *t);
        };
  
        int Test::Reg(const int *a, struct T *t)
        {
           return 0;
        }
  
  

STATUS

Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article. This problem was corrected in Microsoft Visual C++, 32-bit Edition, version 4.0.

MORE INFORMATION

Sample Code

/* Compile options needed: none
*/

   int Reg(const int *a, struct T *t);

int Test::Reg(const int *a, struct T *t)

   return 0;