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Comment by magoghm | Hacker News Reader

Actually, Bertrand Meyer (the creator of the Eiffel Programming Language) has always emphasized that the object oriented origin of Eiffel comes from Simula 67 and not from Smalltalk.

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Yeah, according to his book OOP is mostly about inheritance (Java/c++ style OOP) rather than message passing or objects . Eiffel even support multiple inheritance.

Smalltalk supports multiple inheritance via traits, added to post Smalltalk-80 systems.

iirc Added to Pharo. Not added to the commercial Smalltalk implementations.

Do you know different?

Just by reading papers, so I might be wrong here regarding adoption among them.

My last commercial Smalltalk was Smalltalk/V, just before Java got released, so not much I can state here.

I think it was added originally in Squeak[0], Pharo got it from there.

[0] https://wiki.squeak.org/squeak/3059

It isn't obvious to me that Squeak classes have been re-organised to actually use traits?

Where-as for some reason I seem to imagine Pharo classes have been re-organized to use traits?

Except that Simula allows free functions and Eiffel does not, while Eiffel also supports metaclasses and Simula does not, additionally using MELT feels like having a Smalltalk image, so it is a bit strange his point of view.

Any details why he thinks that way?

If I had to guess, probably the staticness, which is what people usually mean when they make that Simula/Smalltalk distinction.

I guess from that point of view makes sense.

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