Q168028: FIX: C2955 Caused by the "using" Declaration

Article: Q168028
Product(s): Microsoft C Compiler
Version(s): 5.0
Operating System(s): 
Keyword(s): kbcode kberrmsg kbtool kbCompiler kbCPPonly kbLangCPP kbVC kbVC500bug kbVS97sp1fix
Last Modified: 17-JUL-2001

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The information in this article applies to:

- The C Run-Time (CRT), included with:
   - Microsoft Visual C++, 32-bit Enterprise Edition, version 5.0 
   - Microsoft Visual C++, 32-bit Professional Edition, version 5.0 
-------------------------------------------------------------------------------

SYMPTOMS
========

If you try to use the "using" declaration on a template class defined in a
namespace, the following error message appears:

  error C2955: 'identifier' : use of class template requires template argument
  list

RESOLUTION
==========

Use the using directive instead of the using declaration.

STATUS
======

Microsoft has confirmed this to be a bug in the Microsoft products listed at the
beginning of this article. This bug has been corrected in Visual Studio 97
Service Pack 1.

For additional information about the Visual Studio 97 Service Pack 1, please see
the following article in the Microsoft Knowledge Base:

  Q170365 INFO: Visual Studio 97 Service Packs - What, Where, and Why

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

The using declaration introduces a name into the declarative region in which the
using declaration appears. It allows an individual name from a specific
namespace to be used without explicit qualification. The using directive allows
all the names in a namespace to be used without qualification.

The following sample demonstrates the problem and the workaround.

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

      /* Compiler Options: /GX */ 

      #include <list>

      //#define WORKAROUND //Uncomment this line to workaround

      #ifndef WORKAROUND
      using std::list ; //C2955 here
      #else
      using namespace std ;
      #endif

      int main()
      {
     list<int> li ;
     return 0 ;
      }

REFERENCES
==========

TITLE: using Declaration
URL: mk:@ivt:vccore/F3C/D3E/S4C3C5.HTM

TITLE: using Directive
URL: mk:@ivt:vccore/F3C/D3E/S4C3C6.HTM

Additional query words:

======================================================================
Keywords          : kbcode kberrmsg kbtool kbCompiler kbCPPonly kbLangCPP kbVC kbVC500bug kbVS97sp1fix 
Technology        : kbVCsearch kbAudDeveloper kbCRT
Version           : 5.0
Issue type        : kbbug
Solution Type     : kbfix

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