[Oberon] Intermediate scopes in Oberon-07

Jörg Straube joerg.straube at iaeth.ch
Sun Feb 11 18:19:03 CET 2018

I only declare TYPEs if I use them several times (and as base RECORD of a type inheritance hierarchy)
To be able to use them several times, I normally declare them on module level.
With the one exception I mentioned in an earlier mail: local redefinition of parameter TYPEs only used in that procedure.


> Am 11.02.2018 um 18:10 schrieb Andreas Pirklbauer <andreas_pirklbauer at yahoo.com>:
>   > > In the entire PO2013 system with850 procedures (of which
>   > > only 17 are local ones), there is only ONE local TYPE
>   > > declaration and only 8 local CONST declarations.
>   > Since this example has been cited several times now: I think
>   > that it tells more about the programming style preferred by
>   > Niklaus Wirth than about the actual value of local declarations.
>   > Being able to declare types locally is not so much about
>   > information  hiding as it is making the code easier to understand.
> That may be true. OTOH, the authors of System 3 (ETH Oberon),
> Oberon V4 (Linz Oberon) and A2 (formerly) - all considerably
> larger systems and Original Oberon - also don’t seem to use
> local procedures or locally declared types very much. And I
> don’t think the authors of these systems blindly follow someone
> else’s programming style.
> --
> Oberon at lists.inf.ethz.ch mailing list for ETH Oberon and related systems
> https://lists.inf.ethz.ch/mailman/listinfo/oberon
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