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by BorisTheBrave 1644 days ago
In most languages Subset would be called a trait or interface, rather than general inheritance. You've picked an example with no fields or overriden methods, so it's impossible for it to demonstrate the shortcomings of inheritance.
1 comments
ridiculous_fish 1644 days ago
What is the practical difference between inheritance, and a trait or interface with a default implementation? It seems like both risk the addAll() bug.
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magicalhippo 1644 days ago
Not all languages allow for an interface to have a default implementation though. Delphi for example does not.

This leads the programmer towards composition and delegation.

To aid with this, Delphi even has some sugar for delegation[1].

[1]: https://docwiki.embarcadero.com/RADStudio/Alexandria/en/Usin...

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rackjack 1644 days ago
Multiple inheritance is basically strictly more powerful than either traits or interfaces with default implementations.

I don't think traits or interfaces with default implementations prevent the bug, as I can imagine a Rust implementation that would do something similar.

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