BUG: C2511 Error on Member Function with Unknown Parameter (122267)

The information in this article applies to:

Microsoft C/C++ for MS-DOS 7.0
Microsoft Visual C++ 1.0
Microsoft Visual C++ 1.5
Microsoft Visual C++ 1.51
Microsoft Visual C++, 32-bit Professional Edition 2.0

This article was previously published under Q122267

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'

Reg is the function being defined with the unknown data type, and Test is the name of the class.

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
*/ 

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

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

Modification Type:	Minor	Last Reviewed:	7/5/2005
Keywords:	kbCompiler kbCPPonly KB122267