Equality Operators

The following equality operator features are unsupported.

• Defining a pointer to member function type. Example:

  struct X {
  
  
        void f() {}
  
  
  };   
  
  
  typedef void (X::*PROC)();
  

• Permitting an implementation to compare a pointer to member operand with a constant expression which evaluates to zero using the == operator.

  class X {
  
  
  public:
  
  
        int m;
  
  
  };   
  
  
  (void) ( &X::m == 0 );      
  
  
   -----------^-------------ERROR