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Started by RDB-design grupp 34
Mon, 27 May 1991 21:47
BETA-langauage?
Author: RDB-design grupp 34
Date: Mon, 27 May 1991 21:47
Date: Mon, 27 May 1991 21:47
7 lines
584 bytes
584 bytes
Anyone heard of the BETA language ? It's said to be a better Simula. Anyone knows where to get more info ? Is there a PD - compiler perhaps? Thanks Magnus Romedahl E-mail: ev9111@njord.fek.su.se
Re: BETA-language?
Author: Ole Lehrmann Madsen
Date: Tue, 28 May 1991 10:56
Date: Tue, 28 May 1991 10:56
837 lines
32710 bytes
32710 bytes
rdbd34@vall.dsv.su.se (RDB-design grupp 34) writes:
>Anyone heard of the BETA language ? It's said to be a better Simula.
>Anyone knows where to get more info ? Is there a PD - compiler perhaps?
>Thanks
>Magnus Romedahl
>E-mail: ev9111@njord.fek.su.se
A BETA implementation is available as part of the Mjolner BETA System.
The Mjolner BETA System is currently an experimental version and is
NOT supposed to be a product. It has been used at a number of
locations for experimental work and teaching of object-orientation.
Anyone who would like to experiment with the system can get it
(essentially) for free by signing a license agreement. There is no
cost if the system is obtained via ftp except that it will be
necessary to buy a pre-print of a book on BETA ($15). The system can
also be mailed on discette and tapes by paying the actual expenses for
this.
The system is currently available on Macintosh/MPW (at least MC68020
processor and 5Mbyte) and on various UNIX platforms including SUN-3,
HP9000 and Apollo3500.
The Mjolner BETA System is distributed by Mjolner Informatics ApS,
which is currently working on developing the system into a commercial
product. Contact person at Mjolner Informatics is
Elmer Sandvad ess@mjolner.dk
A half day tutorial on BETA will be given at OOPSLA'91, Phoenix,
Arizona, 6-11 October, 1991.
Further details of the Mjolner BETA System and order form and license
agreement is included below.
Further information can be obtained from Elmer Sandvad or myself.
Ole Lehrmann Madsen olmadsen@daimi.aau.dk
------------------
The Mj|lner BETA System
A software development environment supporting
object-oriented programming
in the BETA programming language
- BETA is a modern object-oriented language with:
- Powerful abstraction mechanisms including class,
subclass, virtual class, class variable, procedure,
subprocedure, virtual procedure, procedure variable,
coroutine, subcoroutine, virtual coroutine, coroutine
variable, and many more, all unified to the ultimate
abstraction mechanism: the pattern.
- Other features include general block structure,
coroutines, concurrency, strong typing, part objects,
separate objects, and class-less objects.
- The BETA library includes basic data structures,
user interface toolkit, operating system interface,
metaprogramming system, and fragment system.
- The Hyper Structure Editor supports integrated syntax
directed and textual editing, incremental parsing,
abstract presentation and browsing, integration of
documentation and comments, hypertext facilities, and
adaptive pretty printing.
1
The BETA Language
BETA supports the object oriented perspective on programming
and contains comprehensive facilities for procedural and
functional programming. Research is going on with the
aim of including constraint oriented constructs. BETA
replaces classes, procedures, functions and types by a single
abstraction mechanism called the pattern. It generalizes
virtual procedures to virtual patterns, streamlines linguistic
notions such as nesting and block structure, and provides a
unified framework for sequential, coroutine, and concurrent
execution. BETA is a modern language in the SIMULA tradition.
The resulting language is smaller than SIMULA in spite of
being considerably more expressive.
Instances of patterns, called objects, may be used as
variables, data structures, procedure/function activations,
coroutines and concurrent systems. Patterns may be organized
in a classification hierarchy by means of sub-patterns.
Virtual patterns combined with sub-patterns make it
possible to delay the specification of an attribute in
a pattern. Attributes may then have different bindings
in different sub-patterns. This corresponds to virtual
procedures in C++ and dynamic binding of methods in Smalltalk.
In contrast to Smalltalk, the use of virtual patterns may be
checked at compile time, even though the binding is done at
run-time.
BETA includes the notion of pattern variable. This implies
that patterns are first class values, which may be passed
around as parameters to patterns. By using pattern variable
instead of virtual patterns, it is possible to dynamically
change the behavior of an object after its generation.
Most object-oriented languages have classes, subclasses and
virtual procedures. Some languages have procedure variables.
BETA has patterns, subpatterns, virtual patterns and pattern
variables. Since a pattern is a generalization of abstraction
mechanisms like class, procedure, function, and type, the
notions of subpattern, virtual pattern and pattern variable
apply also to these abstraction mechanisms. This means
that in BETA procedures may be organized in a subprocedure
hierarchy in the same way as classes may be organized in
a subclass hierarchy. Since patterns may also be used to
describe coroutines and concurrent processes, these may also
be organized in a pattern hierarchy.
The notion of virtual pattern of course covers virtual
procedures like in C++. In addition virtual patterns
cover virtual classes, virtual coroutines, virtual concurrent
processes, etc. Virtual classes provide a more general
alternative to generic classes (as in Eiffel).
Pattern variables cover procedure variables, that is a
variable that may be assigned different procedures. It is
also possible to have variables that may be assigned different
classes, etc.
Attributes of an object may be part objects or references
to separate objects. It is possible to describe objects
that are not generated as instances of a class pattern,
so-called "class-less objects". References are qualified by a
2
pattern name. This provides a near optimal balance between
compile-time type checking and run-time type checking.
The block structure mechanism makes it possible to create
arbitrarily nested patterns. This makes it possible for
objects to have local patterns used as classes, procedures,
etc. Local pattern greatly enchances the modeling
capabilities of BETA.
BETA does not only allow for passive objects as in
Smalltalk, C++ and Eiffel. BETA objects may also act as
coroutines, making it possible to model alternating sequential
processes and quasi-parallel systems. The BETA language
design includes support for concurrent objects, too.
BETA Implementation
The Mj|lner BETA System includes an implementation of the BETA
programming language. This is an implementation of most parts
of BETA except concurrency. The entire Mj|lner BETA System
is written in BETA, except for a few run-time routines. The
implementation has the following characteristics:
- Native code generation
The compiler generates assembly code.
- Garbage collection
A generation based garbage collection is used. The
current implementation is a mark-sweep algorithm. A
version based on scavenging and mark-sweep is being
currently developed.
- Separate compilation
Programs may be divided into smaller fragments for
separate compilation. The compiler makes an automatic
dependency analysis on the fragments structure. When a
fragments has been changed, the system keeps track of the
dependent fragments that must be recompiled.
- Interface to C and assembly language
There is a general interface to C and assembly language.
This includes call of C procedures and parameter transfer
of simple types, text and C structures.
- Source-level debugger
A source-level debugger for the BETA language is
available. Contains facilities for specifying break-
points, single stepping, inspection of object states,
inspecting the run-time organization, etc. The debugger
is available both with a command-driven interface and with
a graphical interface.
BETA Library
The Mj|lner BETA System includes a library of patterns that
may be used by users. The library consists of:
3
- Basic library
The basic library includes attributes for handling
input/output and files, a text concept, and standard data
structures such as lists.
- A user interface toolkit
The user interface toolkit includes a set of attributes
for creating windows, menus, dialog boxes, etc. For
Macintosh there is a user interface toolkit implemented on
top of the Macintosh Toolbox. For UNIX implementations
there is a user interface toolkit implemented on top of
the X Window System.
- An operating system interface
There is a set of attributes for accessing the underlying
operating system. For Macintosh there is an interface to
most of the Toolbox. The user may easily extend this
interface to possible new Toolbox routines. For UNIX
there is an interface that makes it possible to create
processes and communicate using e.g. pipes. In addition
there is an interface to the file system.
- A metaprogramming system
The metaprogramming system makes it possible to manipulate
programs as data as in Lisp. From the grammar of a
given programming language, a set of classes corresponding
to the abstract syntax is generated. This gives well
defined representation of abstract syntax trees. All
tools in the Mj|lner BETA System use this representation
to manipulate BETA programs. This common representation
of BETA programs is available for the users that may want
to write their own tools.
- A fragment system
The fragment system handles the physical organization of
BETA programs. Programs may be divided into fragments,
which are the basis for modularization, separation
of interface and implementation, variant control, and
separate compilation.
The Hyper Structure Editor
The hyper structure editor includes the following functional-
ity:
- Syntax-directed editing
Syntax directed editing makes it possible to construct and
edit programs without introducing syntax errors.
Syntax directed editing is especially useful for
application oriented languages intended for end-users,
casual users and beginners that may have difficulties
in remembering the concrete syntax. Also a program
constructed by syntax-directed editing needs not be
parsed, thereby saving time in the development phase.
4
- Text editing
The programmer may freely alternate between syntax
directed editing and textual editing. Any program part
may be textually edited using keyboard, mouse and menus in
the usual style known from Macintosh.
- Incremental parsing
Any program part that has been textually edited is
immediately parsed and inserted into the abstract syntax
tree.
- Integration of documentation and comments
The user may add a comment at any place in a program
(technical speaking a comment may be added to any node
in the abstract syntax tree). The user decides whether
or not to display a comment. Also the user decides
whether to display a comment as part of the program or in
another window. It is possible to obtain a pretty-print
of a program which includes just the modules and procedure
headings and corresponding comments. This makes it
possible to extract a functional specification from the
program.
This facility has turned out to be one of the most useful
features of the editor. Programmers are motivated for
integrating code and documentation since it is easy to
extract part of the program and the comments as functional
specifications and other documentation.
- Hypertext facilities
The editor includes hypertext facilities. The facility
for handling comments is an example of a hyperlink between
a program and a text document. Another type of hyperlink
is a link form the use of a name to the declaration of the
name. The editor is currently being extended to include
general hypertext facilities.
- Abstract presentation and browsing
The editor is able to present a program at any level of
detail. At the top-level of a program the user may get an
overview of modules and procedures. It is then possible
to browse through modules and procedures to see more and
more details. This mechanism is completely general since
the user may decide the level of granularity.
- Adaptive pretty printing
The editor includes an adaptive pretty printing algorithm
which prints the program such that it always fits within
the size of the window or paper.
Current Projects
Researchers at Aarhus University and Mj|lner Informatics are
currently working on the following projects:
5
- Structure editing of documents
A document has logical structure consisting of title,
preface, chapters, sections, etc. This structure can
easily be described by a grammar. The hyper structure
editor is being extended to support structure editing of
documents.
- Object-Oriented Case Tool
The current architecture of the editor is prepared for
extending the editor with a syntax directed graphical
view of the abstract syntax trees. A graphical syntax
of the overall structure of a BETA program has been
designed. An implementation of the graphical editor will
result in an object-oriented CASE tool, that is fully
integrated with BETA. This tool will make it possible to
keep the consistency between the graphical design and the
BETA code. Traditional problems such as "case gab" and
"reverse engineering" will therefore be eliminated.
- Interface Builder
An interface builder for construction of user interfaces
using direct manipulation is being developed. The
interface builder generates BETA code that makes it easy
for the designer to insert his own application code. The
generated code and the users code are separated.
- Graphics System
A powerful graphical system based on the Stencil &
Paint imaging model, graphical modeling and graphical
interaction is being implemented. On top of the system an
advanced drawing application is being implemented.
- BETA interface to Design/OA
Design/OA is a very powerful graphics package supporting
advanced graphics for drawing diagrams, including
hierarchical diagrams. Design/OA is a product of Meta
Software Corporation, Mass., USA. A BETA interface to
Design/OA has been implemented and is utilized in various
other projects. The Design/OA interface is presently only
for UNIX and the X Window System. A Macintosh version is
forthcomming.
Status
An experimental version of the Mj|lner BETA System has been
implemented as part of the Nordic Mj|lner project (1986-1988).
Since then the system has been further developed by Mj|lner
Informatics ApS, which intends to develop it into a marketable
product. Like C++, BETA is intended to be used for industrial
programming. The Mj|lner BETA System is currently being used
in teaching object-oriented programming. In addition it is
being tested by the Finnish Telecom company Telenokia as part
of the Mj|lner II project, which is a continuation of the
Mj|lner Project.
6
The BETA compiler, basic libraries and user interface
libraries are ready for teaching purposes and industrial
experiments (non-commercial usage). These parts of the
system are well documented and have been heavily tested and
used by Mj|lner Informatics and others. The rest of the
libraries, primarily the metaprogramming system, have also
been used extensively, but are only minimally documented. The
Hyper Structure Editor is fully developed and well documented,
but has not been used extensively and should therefore be
considered a demo version presently.
Mj|lner BETA System availability
Mj|lner Informatics offers a world-wide pre-release of
the Mj|lner BETA System: an industrial object oriented
programming environment and an implementation of the object
oriented programming language BETA. The pre-release is
available for non-commercial usages only.
The pre-release of the system consists of the following:
- BETA Compiler (including a fragment system),
- Hyper Structure Editor (demo version),
- Operating System Interface,
- User Interface Toolkit,
- Several Basic Libraries.
as well as associated documentation (approx. 400 pages).
The system is available on an "as-is" basis and without any
warranties. The compiler, the basic libraries and the user
interface libraries are well documented, whereas the rest of
the system is only with minimal documentation. The compiler
and the libraries are heavily tested through intensive use,
both by Mj|lner Informatics and others. The Hyper Structure
Editor is fully developed, but has not been used extensively,
and should therefore be considered a demo version presently.
As a supplement to the Mj|lner BETA System it is possible
to obtain a pre-print of the book: "Object Oriented
Programming in the BETA Programming Language (Draft)" by B.B.
Kristensen, O.L. Madsen, B. M|ller-Pedersen and K. Nygaard
(approx. 200 pages).
The system is available for four machine-types: Macintosh,
SUN, HP and Apollo. The minimum requirements are:
- Macintosh: CPU 86020, MPW 3.1, System 6.0, 5MB,
- SUN-3: SunOS 4.0, 8MB,
- HP 9000/300 series: HP-UX 7.0, 8MB,
- Apollo 3000 series: DomainOS 10.1, 8MB.
7
The Macintosh version of the system is presently the easiest
version to use, mainly since the user interface toolkit for
the Macintosh is very easy to use, enabling fast production
of advanced interactive programs. The user interface toolkit
for the UNIX versions need a total rewrite to bring it up to
the standards of the Macintosh version. The Macintosh version
has been developed partly under contract with Apple Computer,
Paris.
Mj|lner BETA System Packages:
Mj|lner BETA System can be obtained in two different ways:
- Package A: Available through ftp
In this package, a restricted ftp account is opened at
mjolner.dk to allow for the transfer of the system and
associated documentation (in PostScript format). When
you have returned the order form and a signed license
agreement, you will receive an e-mail describing how to
use the ftp account. The account will be open in a
limited time period. This package is free of charge.
- Package B: On diskette or tape
In this package, the system will be delivered on
diskettes or tapes (depending on the chosen system). The
documentation is delivered in print. The cost of this
package only covers the direct distribution, media and
printing costs.
Both packages consists of the following:
- Compiler, libraries and Hyper Structure Editor,
- Associated documentation,
- README and Installation Guide.
The packages can be ordered using the attached order form. In
order to process the order form, it is necessary that the
attached License Agreement is signed and returned too.
Book pre-print
As a supplement to the system and associated documentation,
we can offer a pre-print of the book: "Object Oriented
Programming in the BETA Programming Language (Draft)" by B.B.
Kristensen, O.L. Madsen, B. M|ller-Pedersen and K. Nygaard.
We recomment purchase of this pre-print since the
documentation does not contain description of the BETA
language useful for serious programming. Other sources exists
on the BETA language, but they are somewhat out of date due to
changes in the language.
The pre-print will be delivered in print at the price of
distribution and printing. The pre-print can only be ordered
in connection with either package A or B.
8
Trademarks: Simula (Simula a.s.), Unix (AT&T), Smalltalk
(ParcPlace Systems), Eiffel (Interactive Software Eng.),
Macintosh (Apple Computer), Design/OA (Meta Software Cor-
poration), The Mj|lner BETA System (Mj|lner Informatics
ApS)
9
ORDER FORM
Name: ----------------------------------------------------
Address: ----------------------------------------------------
----------------------------------------------------
----------------------------------------------------
----------------------------------------------------
Phone: ----------------------------------------------------
Fax: ----------------------------------------------------
E-mail: ----------------------------------------------------
hereby orders the Mj|lner BETA System according to the following:
--------------------------------------------------------------------------------
- Package A: Price: Free of charge -
- --- -
- Check machine type below: -
- Macintosh: ___ -
- Sun-3: ___ -
- HP: ___ -
- Apollo: ___ -
------------------------------------------------------------------------------ -
- Package B: Check machine type below: -
- --- -
- Macintosh: ___ Price: 125 US$ -
- Sun-3: ___ Price: 200 US$ -
- HP: ___ Price: 200 US$ -
- Apollo ___ Price: 200 US$ -
------------------------------------------------------------------------------ -
- Pre-print: ___ Price: 15 US$ -
--------------------------------------------------------------------------------
Signed / -19
----------------------------
(authorized signature)
All orders will be processed as soon as possible and in the
order of arrival. In case of questions or difficulties,
please contact Elmer Sandvad, Mj|lner Informatics (see address
above) or e-mail: support@mjolner.dk.
Please fill-in this order form with care to ensure correct
processing of the order. Please use capital letters or
typewriter and make sure that the information entered is
complete and correct. Please also note, that this order can
only be processed if accompanied by a signed License Agreement
(use reverse side)
10
LICENSE AGREEMENT
As requester of the Mj|lner BETA System, I understand that
this license agreement covers the pre-release of the Mj|lner
BETA System, as distributed by Mj|lner Informatics autumn
1990. The software and associated documentation can be used
only in accordance with the following conditions:
I also understand that the software is provided on an "as
is" basis for my non-commercial research purposes. I will not
distribute the software and associated documentation, or any
portion or derivatives thereof, beyond my organization without
your written consent. I understand and accept that the
software is provided to me without warranties of any kind and
with no provisions for support or future enhancements. I also
understand and accept that neither Mj|lner Informatics or any
of its employees has any liabilities in connection with the
use of the software.
In the case of this software being made available to me
through a temporary ftp account at mjolner.dk, I agree not to
use this account for any other purpose, and not to make the
account available to any other person.
Should I consider using any parts of Mj|lner BETA System
for commercial purposes, I accept that this must be arranged
by special arrangements (i.e. another License Agreement).
AGREED AND ACCEPTED BY:
Name: ----------------------------------------------------
Address: ----------------------------------------------------
----------------------------------------------------
----------------------------------------------------
----------------------------------------------------
Signed / -19
----------------------------
(authorized signature)
11
Selected Mj|lner BETA Publications
1. B.B. Kristensen, O.L. Madsen, B. M|ller-Pedersen,
K. Nygaard: Object-Oriented Programming in The BETA
Programming Language. Computer Science Department, Aarhus
University, Draft October 1990.
2. J.L. Knudsen, O.L. Madsen, C. N|rgaard, L.B. Petersen, E.
Sandvad: Teaching Object-Oriented Programming Using BETA.
In Proceedings of Apple European University Consortium
Annual Conference, Salamanca April 18-20, 1990.
3. O.L. Madsen, B. M|ller-Pedersen: Virtual Classes
--- A powerful mechanism in object-oriented programming.
OOPSLA'89, Object-Oriented Programming Systems, Languages
and Applications, Sigplan Notices, 1989.
4. L. Bak, J.L. Knudsen, O.L. Madsen, C. N|rgaard, E.
Sandvad: An Overview of the Mj|lner BETA System. Mj|lner
Informatics ApS, Science Park Aarhus / Computer Science
Department, Aarhus University, March, 1990.
5. O.L. Madsen, C. N|rgaard: An Object-Oriented Metaprogram-
ming System. Hawaii International Conference on System
Sciences - 21, January 5-8, 1988.
6. O.L. Madsen, B. M|ller-Pedersen: What Object-Oriented
Programming may be --- and what it does not have to be.
Proceedings of the Second European Conference on Object
Oriented Programming, Oslo, August 1988.
7. Mj|lner Informatics Report: The Mj|lner BETA Compiler ---
Reference Manual. Mj|lner Informatics ApS MIA-90-2.
8. Mj|lner Informatics Report: The Mj|lner BETA Fragment
System. Mj|lner Informatics ApS MIA-90-3.
9. Mj|lner Informatics Report: The Mj|lner BETA System ---
Basic Libraries. Mj|lner Informatics ApS MIA-90-8.
10. Mj|lner Informatics Report: The Mj|lner BETA System ---
UNIX Libraries. Mj|lner Informatics ApS MIA-90-9.
11. Mj|lner Informatics Report: The Mj|lner BETA System ---
Macintosh Libraries. Mj|lner Informatics ApS MIA-90-10.
12. Mj|lner Informatics Report: Sif: Hyper Structure Editor
--- Users Guide. Mj|lner Informatics ApS MIA-90-11.
13. J|rgen Lindskov Knudsen, O.L. Madsen: Teaching Object-
Oriented Programming is more than Teaching Object-Oriented
Programming Languages. Proceedings of the Second European
Conference on Object Oriented Programming, Oslo, August
1988.
14. E. Sandvad: Syntax-Directed Graphical Editing. Computer
Science Department, Aarhus University, Draft June 1988.
15. E. Sandvad: Hypertext in an Object-Oriented Programming
Environment. In: J. Andre, J. Bezivin (eds.):
Woodman'89: Workshop on Object-Oriented Document
Manipulation, Rennes May 1989, BIGRE.
16. E. Sandvad, C. N|rgaard: Reusability and Tailorability
in the Mj|lner BETA System. TOOLS'89: Technology of
Object-Oriented Languages and Systems, Paris Nov. 13-15,
1989.
17. E. Sandvad: Object--Oriented Development --- Integrating
Analysis, Design and Implementation. Computer Science
Department, Aarhus University, April 1990.
12
Company Description
Mj|lner Informatics ApS is founded with the purpose of
developing the Mj|lner BETA System into a commercial product
and to participate in research and development projects within
object-oriented software development. The company also does
teaching and consultancy within object-orientation, software
development environments, Macintosh and UNIX workstations.
Mj|lner Informatics is currently working on a contract with
Apple Computer Europe on developing a version of the Mj|lner
BETA System for Macintosh to be used in teaching object-
oriented programming. Another major activity is participation
in the Mj|lner II project together with Telesoft, Telenokia,
EB Technology, Lund University and Aarhus University. Mj|lner
II is partly funded by the Nordic Fund for Technology and
Industrial Development.
Managing director:
Ole Lehrmann Madsen.
Owners:
M.Sc. Lars Bak, Mj|lner Informatics
Associate professor J|rgen Lindskov Knudsen, Aarhus
University
Associate professor Bent Bruun Kristensen, Aalborg
University
Professor Ole Lehrmann Madsen, Aarhus University
M.Sc. Claus N|rgaard, Mj|lner Informatics
Professor Kristen Nygaard, Oslo University
M.Sc. Birger M|ller-Pedersen, Norwegian Computing Center
M.Sc. Elmer Sandvad, Mj|lner Informatics
Ph.D Paal S|rgaard, Norwegian Computing Center
-----------------------------------------------------------------
The company has taken its name from the Nordic mythology where -
Mj|lner is the name of the hammer of the god Thor. According -
to the mythology, this hammer is the perfect tool that cannot -
fail, grows with the task, and always comes back in the hand -
-----------------------------------------------------------------
13
Re: BETA-langauage?
Author: Ken Dickey
Date: Tue, 28 May 1991 15:16
Date: Tue, 28 May 1991 15:16
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rdbd34@vall.dsv.su.se (RDB-design grupp 34) writes: >Anyone heard of the BETA language ? It's said to be a better Simula. >Anyone knows where to get more info ? Is there a PD - compiler perhaps? ... >E-mail: ev9111@njord.fek.su.se I don't have the references handy, but there is an extended article in Wegner's "Research Directions in Object Oriented Programming". -Ken Dickey kend@data.uucp
Re: BETA-langauage?
Author: stt
Date: Wed, 29 May 1991 15:07
Date: Wed, 29 May 1991 15:07
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Re: The BETA Language. There is an implementation of BETA done as part of the "Mjolner" project, which was run (I think) by Ole Lehrmann Madsen of the Computer Science Dept., Aarhus University, Denmark (e-mail: olmadsen@daimi.dk). You might want to start with the OOPSLA '89 proceedings for a list of references. The paper on BETA in OOPSLA '89 was : "Virtual Classes -- A powerful mechanism in object-oriented programming" by O. L. Madsen and B. Moller-Pedersen. OOPSLA '89 (SigPlan Notices 24.10, Oct. 1989).
Re: BETA-langauage?
Author: Peter Goodall
Date: Tue, 04 Jun 1991 21:59
Date: Tue, 04 Jun 1991 21:59
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kend@data.UUCP (Ken Dickey) writes:
>rdbd34@vall.dsv.su.se (RDB-design grupp 34) writes:
>>Anyone heard of the BETA language ? It's said to be a better Simula.
>>Anyone knows where to get more info ? Is there a PD - compiler perhaps?
>...
>>E-mail: ev9111@njord.fek.su.se
>I don't have the references handy, but there is an extended article in
>Wegner's "Research Directions in Object Oriented Programming".
>-Ken Dickey kend@data.uucp
In comp.archives recently I saw a reference to a f.t.p. site which had an
implementation of BETA for the Macintosh.
Sorry, I haven't got the details.
--
Peter Goodall - Smalltalk Systems Consultant - objtch@extro.ucc.su.oz.au
ObjecTech Pty. Ltd. - Software Tools, Training, and Advice
162 Burns Bay Rd, LANE COVE, NSW, AUSTRALIA. - Phone/Fax: +61 2 418-7433
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