[Cuis-dev] Stream hierarchy

[Juan Vuletich]

On 3/18/2025 11:13 AM, Nicolas Cellier via Cuis-dev wrote:
> There is another question: do you need read write stream at all? Most 
> usages in Squeak base image were useless, i mean did not require mixed 
> reads and writes.
>
> Nicolas

This. I never really got ReadWriteStream. I'd be happier if we could 
just remove it.

>
> Le mar. 18 mars 2025, 13:46, Gerald Klix via Cuis-dev 
> <cuis-dev at lists.cuis.st <mailto:cuis-dev at lists.cuis.st>> a écrit :
>
>     We neither have traits nor multiple inheritance.
>     I often missed it. Clearly I reasonable inheritance hierarchy
>     would inherit ReadStream and WriteStream from PositionableStream
>     and ReadWriteStream from both.
>
>
>     Just my 0.02 CHF,
>
>     Gerald
>
>
>     On 3/18/25 1:16 PM, Weslleymberg Lisboa via Cuis-dev wrote:
>     > Hi,
>     >
>     > One thing that bugs me a lot is how the Stream hierarchy is
>     defined. Why is ReadWriteStream a subclass of WriteStream where
>     all the methods for reading have to be reimplemented and
>     duplicated from ReadStream?
>     >
>     > I've read the corresponding chapter in the Blue Book but it just
>     describes the classes, doesn't explain why it's done this way.
>     >
>     > The way I see it, it makes more sense that ReadStream and
>     WriteStream be more specialized Streams which subclass
>     ReadWriteStream and overrides the unneeded methods to raise
>     SholdNotImplement. Like this:
>     >
>     > Stream
>     >      PositionableStream
>     >          ReadWriteStream
>     >              ReadStream
>     >              WriteStream
>     >
>     > What am I missing?
>     >
>     > I'm not proposing a change or anything like that. It's just that
>     the curiosity to understand this is killing me :)
>     >
>     > --
>     > Att.
>     > Wéslleymberg Lisboa
>     > Graduado em Sistemas de Informação
>     > Docente no IFFluminense - Campus Itaboraí
>     > Ex-Bolsista de IC do Núcleo de Computação Científica (NC2-IFF) -
>     Projeto IFF Aerospace
>     > Github: https://github.com/weslleymberg
>     > Tel.: +55 22 99931-2376
>     >
>
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>


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Juan Vuletich
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