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     Compiler error C2231
 
     '.' : left operand points to 'class-key', use '->'
 
     The left operand to the member selection operator (.) was a
     pointer to a class, structure, or union.
 
     The left operand to the member selection operator must be a
     class, structure, or union.
 
     The following is an example of this example:
 
          struct S
          {
          public:
              int member;
          } s, *ps;
 
          void main()
          {
             ps.member = 0;  // error, ps points to structure S
             ps->member = 0; // OK, ps points to a structure S
             s.member = 0;   // OK, s is a structure type
          }
                                    -♦-