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From: jww@bonnie.UUCP (Joel West)
Newsgroups: net.lang,net.lang.st80,net.lang.pascal
Subject: Replies to Object-oriented Pascal ("Clascal") query
Message-ID: <416@bonnie.UUCP>
Date: Mon, 18-Feb-85 23:27:08 EST
Article-I.D.: bonnie.416
Posted: Mon Feb 18 23:27:08 1985
Date-Received: Thu, 21-Feb-85 06:38:01 EST
Organization: CACI -- La Jolla, Calif.
Lines: 83
Xref: watmath net.lang:1435 net.lang.st80:201 net.lang.pascal:241

This summarizes the responses I received regarding my original message 
asking about "Clascal" or like attempts at making procedural languages 
object-oriented.

I received a response from Apple (the address can be obtained by looking at 
net.micro.mac) that notes the following:
  <<We have recently changed the language substantially (mostly syntactic 
    changes), in order to make it easier to teach.  This version is currently 
    running on the Lisa and compiling Macintosh-executable code.  (It is now 
    called Object Pascal, because the concept of a 'class' is not explicitly 
    represented in the language.)

    ... [for] written information, write to the following address:
      Advanced Architecture Group
      Apple Computer
      10455 Bandley Drive M/S 2-P
      Cupertino, CA 95014>>

BYTE obviously has a lot of readers out there.  Several readers wrote:
  <<The article titled "Software Frameworks" in the December 1984 BYTE
    magazine, starting on page 124, describes a bit about Clascal.  It's not
    a very detailed description, but says enough to make it seem that they
    really do have an object-oriented Pascal.  Seems like a pretty nice
    development environment.>>

Someone pointed out C++:
  <<C++ is (in one sentence) C with Simula type classes added, but with 
    more such as overloading. The special Bell Labs Technical Journal 
    on the UNIX System (October 1984, part 2) has an article on
    it (titled "Data Abstraction in C++").>>
C++ is developed as an internal AT&T enhancement via a pre-processor to cc(1).
Within AT&T, there's even a newslist (att.lang.c++).  Outside AT&T, unless 
you're a university, you can't lay your hands on the software.  However the 
following set of documentation
	A C++ tutorial (within Bell Labs, refer to CSTR113)
	The C++ Programmming Language -- Reference manual (CSTR108)
	Data Abstraction in C++ (CSTR109)
	Operator overloading in C++
	Complex arithmetic in C++
	A Set of C++ classes for Co-routine Style Programming (CSTR90)
can be obtained (as I did) by sending $25 to
	AT&T Technologies 		1 (919) 279-3128
	Software Sales & Marketing
	Guilford Center (PO Box 20046)
	Greensboro, NC  27420
I found the "Data Abstraction" article to be the best introduction to C++.

Several responses suggested a privately sold Smalltalk-like object-oriented
'C' preprocessor:
  <<...a company called PPI (in Connecticut) markets a language called Objective
    -C.  A good article about Objective-C can be found in the January 1984 IEEE
    Software (Vol. 1 #1).  Objective-C looks like regular C, except that you can
    embed Smalltalk statements in the code.>>
  <<PPI is a company "Productivity Products International" in Sandy Hook CT.  
    203-426-1875. They sell an Objective C compiler ( preprocessor actually I 
    think)...They offer training courses several times a year.>>

There was interest in what I already know about 'Flavors'.
    I recommend the "Lisp Machine Manual," from the MIT Artificial Intelligence
    Lab, 545 Technology Square, Cambridge, MA 02139.  In the book, which 
    documents Zetalisp, flip to chapter 21 (pp.401-447 in the June 1984 edition)
    for an excellent discussion titled "Objects, Message Passing, and Flavors".
A posting to net.lang.st80 noted that the Flavors of Franz Lisp is described by
(Technical Report) TR-1226, available from:
	University of Maryland
	Computer Science Department
	Publications Office
	College Park, Maryland   20783

**MINIFLAME** Flavors is unusual in that is the only one I've found to allow 
multiple inheritance or "mix-ins", i.e. combining two classes to make a third. 
This is a very serious shortcoming of the other existing systems. ***

Finally, my paper is tentatively entitled "Distributed Simulation in 
Object-Oriented SIMSCRIPT."  If you want to know more or want one (when done
in mid-April), drop me a msg or call.
-- 
	Joel West
	CACI, Inc. - Federal 3344 N. Torrey Pines Ct La Jolla 92037
	jww@bonnie.UUCP (ihnp4!bonnie!jww)
	westjw@nosc.ARPA

   "The best is the enemy of the good" - A. Mullarney