FIX: C1001 file 'msc1.cpp', line 1188, Using Recursive Namespace (168374)

The information in this article applies to:

Microsoft Visual C++, 32-bit Enterprise Edition 5.0
Microsoft Visual C++, 32-bit Enterprise Edition 6.0
Microsoft Visual C++, 32-bit Professional Edition 5.0
Microsoft Visual C++, 32-bit Professional Edition 6.0
Microsoft Visual C++, 32-bit Learning Edition 6.0

This article was previously published under Q168374

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 that this is a bug in the Microsoft products that are 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 ;
   }

Modification Type:	Major	Last Reviewed:	12/8/2003
Keywords:	kbBug kbcode kberrmsg kbfix kbNoUpdate KB168374