BUG: Wrong Namespace Member Selected for Qualified ID

• Microsoft Visual C++, 32-bit Editions, version 5.0

SYMPTOMS

The wrong member function is called if you:

• define a class with the same name, in different scopes;
• create a temporary object, as shown in the sample, of that class type;
• call a member function of that class.

RESOLUTION

Do not create a temporary object. Instead create a local object, and then call the member functions through the local object.

STATUS

Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article. We are researching this bug and will post new information here in the Microsoft Knowledge Base as it becomes available.

MORE INFORMATION

The following sample demonstrates the problem and the workaround.

SAMPLE

   /*
   Compile Options: /GX
   */
   # include <iostream>
   using namespace std ;

   struct CMyClass
   {
      virtual void DoSomething()
      {
         cout << "::CMyClass::DoSomething()\n";
      }
   };

   namespace MyNameSpace
   {
      struct CMyClass
      {
         virtual void DoSomething()
         {
            cout << "MyNameSpace::CMyClass::DoSomething()\n";
         }
      };
   }

   int main()
   {
      MyNameSpace::CMyClass().DoSomething() ;
      // Workaround: Comment the line above,
      // Uncomment the following lines
      // MyNameSpace::CMyClass C1 ;
      // C1.DoSomething();
      return 0;
   }