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     Compiler error C2643
 
     illegal cast from pointer to member
 
     A pointer to a member of a class, structure, or union was cast to
     a different type.
 
     The following is an example of this error:
 
          class C
          {
          public:
             int i;
             operator int*() { return &i; }
          };
 
          int C::* cpi = (int*)&C::i; // error
          int C::* cpi2 = &C::i;      // OK
                                    -♦-