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computers / alt.sys.pdp10 / ITS version of CLU programming language

ITS version of CLU programming language

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From: lars.s...@nocrew.org (Lars Brinkhoff)
Newsgroups: alt.sys.pdp10
Subject: ITS version of CLU programming language
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Date: Wed, 01 Sep 2021 12:51:39 +0000
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by: Lars Brinkhoff - Wed, 1 Sep 2021 12:51 UTC

Barbara Liskov's CLU programming language from the 1970s feels
surprisingly modern. It has garbage collection, exceptions,
parameterized types. Files from ITS backup tapes are now available.
The compiler and runtime system runs on PDP-10 emulators.

https://github.com/MITDDC/clu-1976-1989

Re: ITS version of CLU programming language

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Date: Sat, 4 Sep 2021 09:48:33 -0700 (PDT)
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Subject: Re: ITS version of CLU programming language
From: sbyrne...@gmail.com (sbyr...@gmail.com)
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by: sbyr...@gmail.com - Sat, 4 Sep 2021 16:48 UTC

On Wednesday, September 1, 2021 at 5:51:40 AM UTC-7, lars...@nocrew.org wrote:
> Barbara Liskov's CLU programming language from the 1970s feels
> surprisingly modern. It has garbage collection, exceptions,
> parameterized types. Files from ITS backup tapes are now available.
> The compiler and runtime system runs on PDP-10 emulators.
>
> https://github.com/MITDDC/clu-1976-1989

I always liked CLU -- definitely VERY clear distinction on the internal representation of things vs the external.

I'd go further with the parameterized types statements. I believe it's somewhat akin to Go's use of interfaces and its form of protocol-based polymorphism. You define a class ("cluster" in CLU) and you can specify that any particular type that the class is based on (and/or maybe method parameter types, not sure) has specific operations; it is, or can be, more "protocol" based in defining classes; as long as the underlying type has operations x, y, and z (etc) with some specific set of parameter types, you can use it.

Definitely a bit ahead of its time in many ways!

Steve

Subject	Author
ITS version of CLU programming language	Lars Brinkhoff
Re: ITS version of CLU programming language	sbyr...@gmail.com