FIX: Template Friend Function Causes Compiler Error C2248

MORE INFORMATION

The following sample demonstrates the problem and the workaround.

Sample Code

   /*
   Compile option: None
   */ 

   class X;

   template <class T> void AFunction(X &x, T &t);

   class X
   {
   private:

      int m_n;

   public:

      template <class T> friend void AFunction(X &x, T &t) ;

   };

   template <class T> void AFunction(X &x, T &t)
   {

      x.m_n = t; // C2248 here.

   }

   int main()
   {
      X x;
      int n;
      AFunction(x, n);

           return 0 ;
   }

				

NOTE: Defining the template function before the class definition eliminates the compiler error C2248. But the compiler does not generate any code when you call the template function.