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     Compiler error C2644
 
     basis class 'class' for pointer to member has not been defined
 
     A pointer was declared that pointed to a class that was declared
     but not defined.
 
     The following is an example of this error:
 
          class C;
          int C::* cp; // error, C has not been declared
          class D {};
          int D::*dp;  // OK
                                    -♦-