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     Compiler error C2083
 
     struct/union comparison illegal
 
     A structure or union was directly compared with another user-
     defined type.
 
     A user-defined type cannot be compared with another user-defined
     type unless a comparison operator has been defined or unless a
     conversion to a scalar type exists.
 
     The following is an example of this error:
 
          struct A
          {
             int i;
          } a, b;
 
          void func()
          {
             if( a == b );   // error, structure comparison
          }
                                    -♦-