Q122267: BUG: C2511 Error on Member Function with Unknown Parameter

Article: Q122267
Product(s): Microsoft C Compiler
Version(s): 1.0,1.5,1.51,2.0
Operating System(s): 
Keyword(s): kbCompiler kbCPPonly kbVCkbfixlist
Last Modified: 29-JUL-2001

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The information in this article applies to:

- Microsoft C/C++ Compiler (CL.EXE), included with:
   - Microsoft C/C++ for MS-DOS, version 7.0 
   - Microsoft Visual C++, versions 1.0, 1.5, 1.51 
   - *EDITOR Please do not choose this product*Microsoft Visual C++ 32-bit Edition* use 241, 265, 225, versions 1.0, 2.0 
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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;
  }

Additional query words: 7.00 8.00 8.00c 9.00 1.00 1.50 1.51 2.00 buglist1.51 buglist2.00

======================================================================
Keywords          : kbCompiler kbCPPonly kbVC kbfixlist
Technology        : kbVCsearch kbAudDeveloper kbCVCComp
Version           : :1.0,1.5,1.51,2.0

=============================================================================

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