BUG: C1001 file 'msc1.cpp', line 1188, Using Recursive Namespace

• Microsoft Visual C++, 32-bit Editions, versions 5.0, 6.0

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.

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
Version : winnt:5.0,6.0
Platform : winnt
Issue type : kbbug