🚀 go-pugleaf

In article <9208111754.AA06971@jupiter.risc.rockwell.com> kal@jupiter.risc.rockwell.com (Kevin Lovette) writes:

   From: kal@jupiter.risc.rockwell.com (Kevin Lovette)
   Date: 11 Aug 92 17:54:14 GMT

   I have some code that uses (setf slot-value-using-class) to trigger the update
   of windows on my display.  When I ported this code from Franz to Lucid it
   stopped working.  It turns out that accessors in Franz are implemented with
   slot-value, but in lucid accessors seem to directly access the slot without
   calling slot-value. 

   Is there a finalized CLOS MOP specification yet? If so, what does it specify? 

The MOP specification is available via two means.  The specification
alone is available by anonymous FTP from parcftp.xerox.com.  It is also
available, along with conceptual material about MOPs, as chapters 5 and
6 of `The Art of the Metaobject Protocol,' by Gregor Kiczales, Jim des
Rivieres and Daniel G. Bobrow.  MIT Press.  ISBN # 0-262-61074-4.

As it turns out, the specification never comes right out and says that
automatically generated accessor methods must call SLOT-VALUE-USING-CLASS
and (SETF SLOT-VALUE-USING-CLASS).  But that is certainly what was
intended.  Otherwise, code like your's becomes difficult (perhaps even
impossible) to write.

The current version of PCL, unless something has changed I don't know
about, supports this.  It is pretty easy to do without undue performance
penalty.

Gregor