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.
What is the practical difference between inheritance, and a trait or interface with a default implementation? It seems like both risk the addAll() bug.
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.
ridiculous_fish|4 years ago
magicalhippo|4 years ago
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...
rackjack|4 years ago
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.