DOCUMENT:Q168374  10-FEB-2002  [visualc]
TITLE   :FIX: C1001 file 'msc1.cpp', line 1188, Using Recursive Namespace
PRODUCT :Microsoft C Compiler
PROD/VER::5.0,6.0
OPER/SYS:
KEYWORDS:kbcode kberrmsg kbtool kbVC500bug kbVC600bug kbNoUpdatekbbuglist

======================================================================
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The information in this article applies to:

 - Microsoft Visual C++, 32-bit Enterprise Edition, versions 5.0, 6.0 
 - Microsoft Visual C++, 32-bit Professional Edition, versions 5.0, 6.0 
 - Microsoft Visual C++, 32-bit Learning Edition, version 6.0 
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SYMPTOMS
========

Using namespace names recursively causes the compiler to generate the following
error message:

   fatal error C1001: INTERNAL COMPILER ERROR (compiler file 'msc1.cpp', line
   1188)

RESOLUTION
==========

Use the "using" directive instead of the "using namespace" directive. Please see
the sample in the MORE INFORMATION section of this article for a workaround.

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++ .NET.

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

The following sample code demonstrates the problem and a workaround:

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

      /*
      Compile Options: /GX
      */ 
      #include <iostream>

      namespace A
      {
      }

      namespace B
      {

         using namespace A;

      }

      namespace A
      {

         int Ai ;
         using namespace B;
      }

      int f(void)
      {
         using namespace A ; //C1001 here
         //Workaround: Comment the above line
         //Uncomment the line below
         //using A::Ai ;
         Ai = 100 ;
         return Ai ;
      }

      void main()
      {
         std::cout << "A::Ai = " << f() << std::endl ;
      }

Additional query words:

======================================================================
Keywords          : kbcode kberrmsg kbtool kbVC500bug kbVC600bug kbNoUpdate kbbuglist
Technology        : kbVCsearch kbAudDeveloper kbVC500 kbVC600 kbVC32bitSearch kbVC500Search
Version           : :5.0,6.0
Issue type        : kbbug
Solution Type     : kbfix

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

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