illegal reference to non-static member 'identifier'

Possible causes:

1. A nonstatic member is specified in a static member function. To access the nonstatic member, you must pass in or create a local instance of the class and use a member-access operator (. or ->).

2. The specified identifier is not a member of a class, structure, or union. Check identifier spelling.

3. A member access operator refers to a nonmember function.

4. The following sample generates C2597 and shows how to fix it:

// C2597.cpp  
// compile with: /c  
struct s1 {  
   static void func();  
   static void func2(s1&);  
   int i;  
};  
  
void s1::func() {  
   i = 1;    // C2597 - static function can't access non-static data member  
}  
  
// OK - fix by passing an instance of s1  
void s1::func2(s1& a) {  
   a.i = 1;  
}