🚀 go-pugleaf

  On page 23 of the libg++ documentation (first page of Chap. 6)
are directions for using void* coercion to create container classes
that share code.  I tried creating a container class using
this mechanism and am getting a compiler error.  Below is
the pertinent code and error message.

-------------------------------------------------------------------------

typedef Edge* EdgePtr;
typedef void* Ptr;

class PtrBag {          // created by "genclass Ptr val Bag"

public:
  virtual Ptr&          operator () (Pix i) = 0; // access item at i

};

class PtrSLBag : public PtrBag {      // created by "genclass Ptr val SLBag"

public:
  Ptr&          operator () (Pix i);

};

class EdgePtr_bag : public PtrSLBag {    // my derived class

  public:

    EdgePtr& operator()(Pix i) { return (EdgePtr&)PtrSLBag::operator()(i); }
};


---------------------------------------------------------------------------

EdgePtr_bag.h:12: conflicting return type specified for virtual function `class
Edge* EdgePtr_bag::operator () (void *)'

  Any help, insight, comments will be greatly appreciated.

					Thanks,
						Phil D.

-- 
Phillip J. Duncan
duncan@janet.ucla.edu               ...!(uunet,ucbvax)!janet.ucla.edu!duncan
UCLA EE Dept.  56-122 Engineering IV, Los Angeles,  CA 90024   (310)206-4465