FIX: C2974 When Explicitly Call Class Template('s) Destructor

The information in this article applies to:

• The Microsoft C/C++ Compiler (CL.EXE), included with: Microsoft Visual C++, 32-bit Edition, versions 2.0 and 2.1

SYMPTOMS

When you explicitly call a class template destructor, and the class object is instantiated with a user defined class in a C++ program, the compiler generates the following compiler errors:

   Error C2974 : 'B' : invalid template actual argument '#1',
                       type expected
   Error C2039 : 'B<int>' : is not a member of 'B<class A>'

RESOLUTION

The following code can be used to work around the problem.

Problem:

   B<A> a;
   a.B<A>::~B();

   B<A> a;
   a.B< class A >::~B();

STATUS

Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article. This problem was fixed in Microsoft Visual C++, 32-bit Edition, version 4.0.

MORE INFORMATION

Sample Code to Demonstrate Problem

/* Compile options needed: none.
*/

   A() {}
   ~A() {}

template < class T > class B { public:

   B() {}
   ~B() {}

void main()

   B<A> a;
   // Workaround: change the following line into a comment
   // and change the line after that into an executed line of code.
   a.B<A>::~B();
   // a.B<class A>::~B();