Q141457: FIX: C1001 When Calling Base Class Conversion Operator

Article: Q141457
Product(s): Microsoft C Compiler
Version(s): winnt:
Operating System(s): 
Keyword(s): kbcode kbCompiler kbCPPonly kbVC kbVC410fix
Last Modified: 30-JUL-2001

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The information in this article applies to:

- The C/C++ Compiler (CL.EXE), included with:
   - *EDITOR Please do not choose this product*Microsoft Visual C++ 32-bit Edition* use 241, 265, 225, version 4.0 
-------------------------------------------------------------------------------

SYMPTOMS
========

Compiling a C++ file that contains an explicit call to a base class conversion
operator, with the /FR compiler option (create Browser information) may result
in the following fatal compiler error:

  C:\Test\Test.Cpp(22) : fatal error C1001: INTERNAL COMPILER ERROR (compiler
  file 'msc1.cpp', line 899)

RESOLUTION
==========

There are two possible workarounds:

- Turn off "Generate browse info" or remove /FR compiler option.

-or-

- Provide an implicit call to the base class conversion operator as
  demonstrated by the following sample code.

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

  /* Compile options needed: /FR
  */ 

  class   Base
  {
  public:
      operator int()
      {
          return 0;
      }
  };

  class   Derived : public Base
  {
      int fun()
      {
          return  Base::operator int();

  // The following line is a workaround for the
  // previous line that fails.

     //  return  int(*((Base*)this));
      }
  };

STATUS
======

Microsoft has confirmed this to be a bug in the Microsoft products listed at the
beginning of this article. This bug was corrected in Visual C++ 4.1.

Additional query words: kbVC400bug 4.00 10.0 4.10 10.10 ICE

======================================================================
Keywords          : kbcode kbCompiler kbCPPonly kbVC kbVC410fix 
Technology        : kbVCsearch kbAudDeveloper kbCVCComp
Version           : winnt:
Issue type        : kbbug
Solution Type     : kbfix

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

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