FIX: C2321 Expanding Template with a Pointer to a Nested Class

• The C/C++ Compiler (CL.EXE), used with:
  • Microsoft Visual C++, 32-bit Editions, versions 4.0, 4.1, 4.2, 5.0

SYMPTOMS

At the point where a class template is expanded using the new operator to a nested class, the compiler reports the following errors:

[FileName](10) : error C2321: syntax error : unexpected 'A::B'

[FileName](27) : fatal error C1004: unexpected end of file found

STATUS

This bug was corrected in Microsoft Visual C++, version 6.0.

RESOLUTION

There are two possible workarounds to this problem. Each is stated in terms of the sample code below:

• Remove t(new T()) from the initializer list and add t = new T(); to the body of the constructor. This workaround assumes class T is not a reference or a constant pointer.



• Change the definitions of class A and class B so that B is no longer nested in the definition of A.

Sample Code

/* Compile options needed: None */ 
template <class T> class C
{
public:
   C();
private:
   T *t;
};

template <class T> C<T>::C() : t(new T())  // error
{
}

lass A
{
public:

   class B
   {
   };

};

main()
{

   C<A::B> c;
   return 0;

} 

Additional query words:

Keywords : kbnokeyword kbVC400bug kbVC410bug kbVC420bug kbVC500bug kbVC600fix
Version : winnt:4.0,4.1,4.2,5.0
Platform : winnt
Issue type : kbbug