C++ help wanted

[Michael Gerz]

Hi folks,

could somebody please tell me why this piece of code compiles:
      bool const show_change = par.lookupChange(cur.pos()) != 
Change::UNCHANGED;

as we have this

 class Change {
 public:
         /// the type of change
         enum Type {
                 UNCHANGED, // no change
                 INSERTED, // new text
                 DELETED // deleted text
         };
 }

and this

      /// look up change at given pos
       Change const lookupChange(lyx::pos_type pos) const;

Since when is it allowed to compare an object with an enum???

Michael