Q116486: FIX: Compiler May Generate Invalid Errors for Local Classes

Article: Q116486
Product(s): Microsoft C Compiler
Version(s): 1.0,1.5,2.0
Operating System(s): 
Keyword(s): kbCompiler kbCPPonly kbVCkbbuglist kbfixlist
Last Modified: 26-JUL-2001

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The information in this article applies to:

- Microsoft C/C++ Compiler (CL.EXE), included with:
   - Microsoft Visual C++, versions 1.0, 1.5 
   - *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
========

The compiler may incorrectly generate the following error messages when
compiling code that declares a local class that derives virtually from another
class:

  C2517: 'identifier' : right of '::' is undefined
  C2270: 'identifier' : modifiers not allowed on nonmember functions
  C2561: 'identifier' : function must return a value

Under Visual C++ version 2.0, the following errors are generated:

  C2653: 'identifier' : is not a class name
  C2561: 'identifier' : function must return a value

You can use the sample code in the "MORE INFORMATION" section, below, to
illustrate this problem.

RESOLUTION
==========

To avoid the error messages, either do not derive the local class virtually or
do not declare both the parent and the derived class as local classes.

STATUS
======

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

MORE INFORMATION
================

Sample Code
-----------

  /* Compile options needed: none
  */ 

     void main()
     {
         class B { public: int bi; };             // Class local to main
         class D : virtual public B { int di; };      // Class derived from
                                                  // Local class B
         D d;
     }

Additional query words: 8.00 8.00c 9.00 1.00 1.50 2.00

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Keywords          : kbCompiler kbCPPonly kbVC kbbuglist kbfixlist
Technology        : kbVCsearch kbAudDeveloper kbCVCComp
Version           : :1.0,1.5,2.0
Issue type        : kbbug
Solution Type     : kbfix

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