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- Item 0600552 11-Aug-89 09:46
-
- From: LINS Lins, Chuck,APL
-
- To: D1220 Vari-Lite, Andy Meldrum,PRT
-
- cc: MACAPP.TECH$ MACAPP Tech
- KGNEMITZ Nemitz, Keith,APL
- BOBC Campbell, Bob,APL
- EVINS1 Evins, Mikel,APL
-
- Sub: Re: Feature Request
-
- Andy,
-
- Unfortunately I don't know of any way in Object Pascal that you can know or
- test at run-time whether a class implements a specific method. You can do this
- as you mention in Smalltalk as well as in Object Oberon with the ACCEPTS
- clause. In addition you can pass methods as parameters by means of message
- variables. Sorry there are NO Object Oberon compilers for the Mac or even the
- 680x0 series. (At present a version exists at ETH Zurich for the NS32532
- processor and Ceres-2 workstation.)
-
- I won't go into one of my usual flames against Object Pascal, but unless one
- wants to march right in step with the rest of the C++ lemmings there are no
- alternatives for a Pascal oriented programmer other than Object Pascal. Of
- course, one could always switch to object-orient Lisp or Smalltalk - at least
- these languages have real environments built around them.
-
- In case anyone out there has never heard of Object Oberon (probably most of
- you) and would like to find out more information about Niklaus Wirth's current
- language researches, here's a list of all references I know of as of this date:
-
- [1] N. Wirth, "The Programming Language Oberon." Software-Practice and
- Experience, 18 (7), 661-670.
- [2] N. Wirth, "From Modula to Oberon." Software-Practice and Experience, 18
- (7).
- [3] N. Wirth, "Type Extensions." ACM Transactions of Programming Languages and
- Systems, 10 (2), April 1988, 204-214.
- [4] N. Wirth and J. Gutknecht, "The Oberon System." Computer Science Report 88,
- ETH Zurich.
- [5] H. Mossenbock and J. Templ, "Object Oberon - A Modest Object-Oriented
- Language." Structured Programming, 10 (4), 1989 (to appear).
- [6] G. Blaschek, G. Pomberger, and A. Stritzinger, "A Comparison of
- Object-Oriented Languages." Structured Programming, 10 (4), 1989 (to appear).
- [7] A.J.E. van Delft, "Comments on Oberon", SIGPLAN Notices, 24 (3), 1989,
- 23-30.
- [8] V. Milanese, "Aspects of Oberon Suitable for Graphics Applications",
- SIGPLAN Notices, 24 (8), 1989, 37-45.
-
- Chuck Lins
- Apple Computer, Inc.
-
-
-