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                       OS/2 Bay Area User Group
 
                           Developers SIG
 
                       Monday, April 11th, 1994
 
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The OS/2 Bay Area User Group Developers SIG (Special Interest Group)
will have its monthly meeting on Monday, April 11th.  

Bay Area OS/2 User Group Board member Githogori will discuss how to add help 
to your PM applications using the Information Presentation Facility (IPF).
He will cover several advanced topics such as extending IPF using DLLs.

The meeting is free and open to the public.  


 
Date: Monday, April 11th, 1994
 
Time: 7:00 to 9:00 PM 
      Doors open at 6:30 for Social/Networking time before meeting.
 
Place:IBM
      1055 Joaquin Rd (Near 101 and Shoreline - cross street: Plymouth)
      Mountain View, California
 
 
    
For more information contact:
 
      Dave Briccetti  (510) 945-7565, fax: 945-7436
	              daveb@netcom.com
                      74475,1072



The Developers SIG maintains an OS/2 Consultants Directory, which is
distributed to companies that contact the User Group looking for OS/2
expertise.  If you would like to be in the directory, contact SIG Chair
Dave Briccetti.



==============================================================================
 
                       OS/2 Bay Area User Group
 
                           Developers SIG
                           
                           Special Event
 
                      Wednesday, April 27th, 1994
 
==============================================================================
 
The OS/2 Bay Area User Group Developers SIG (Special Interest Group)
will have a special meeting Wednesday, April 27th.  

SOM developer Ira Forman will deliver a talk entitled "Metaclass 
Programming: The Next Epoch in the Evolution of Software Development."
The full abstract for the talk appears at the end of this announcement.

Dr. Ira R. Forman is a member of IBM's Object Technology Products
Group, which has produced the SOMobjects Toolkit.  Forman received his
Ph.D. in Computer Science from the University of Maryland, where he
studied under Harlan Mills.  Forman's specialties are object-oriented
distributed systems and object composition.

This special meeting will be held in conjunction with the Technical 
Interchange '94 in the Pink Pearl room of Hotel Nikko at 7:00 PM.  
The address is 222 Mason St, SF.

The meeting is free and open to the public.  


 
Date: Wednesday, April 27th, 1994
 
Time: 7:00 to 9:30 PM 
 
Place:Hotel Nikko, Pink Pearl Room
      222 Mason Street
      San Francisco, California
 
 
    
For more information contact:
 
      Dave Briccetti  (510) 945-7565, fax: 945-7436
	              daveb@netcom.com
                      74475,1072



ABSTRACT - "Metaclass Programming: The Next Epoch in the Evolution of 
Software Development"

Metaclass programming offers new opportunities for factoring and
composing software.  This implies greater reusability and reduced
costs.  In SOM, the IBM System Object Model, a class is a run-time
object that defines the behavior of its instances by creating an
instance method table.  Because classes are objects, their behavior is
defined by other classes (called metaclasses).  The central issue
addressed in this talk is raising the level of programming by
composing metaclasses. The standard notion of inheritance-based
subclassing represents a union-like operation for composition of class
implementations.  There is no reason to believe that one such
operation is sufficient for all the possible compositions that need to
be performed. With the approach described here, significant object
properties can be isolated using before/after metaclasses;
subsequently, these properties can be composed and reused.
Linguistically, a property is often represented by an adjective while
a class is represented by a noun.  Composition of metaclasses should
be as easy as putting a sequence of adjectives in front of a noun.



<< End >>

-- 

Dave Briccetti, Owner, Dave Briccetti & Associates
OS/2 Developer/Consultant
P.O. Box 1713
Lafayette, CA  94549-7013