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> What would it take for C# and/or others to "do OO well"?

Multiple inheritance. (j/k)

Unironically this.

Having "interfaces" and "abstract classes" is just a kludge, multiple inheritance covers all of this with one language construct.

The "diamond problem" is a C++ issue, every other language solved it.

I think they solved the problem by not supporting multiple inheritance, instead supporting interfaces and/or traits. But also "composition over inheritance" pretty much won, thankfully imho.

Mixins via inheritance is a sweet pattern that I miss in C# sometimes.

C# has default interface implementations now, that can be used to create mixins...

https://learn.microsoft.com/en-us/dotnet/csharp/advanced-top...

Yeah I sometimes use them but they don’t cover all the cases. I’m waiting for roles/extensions to see if I can achieve a similar result.

https://github.com/dotnet/csharplang/discussions/5496

https://en.wikipedia.org/wiki/Multiple_inheritance#Mitigatio...

CLOS and Ocaml figured it out

When in doubt look to CLOS.

The "diamond problem" isn't a C++ problem. C++ solved it with virtual inheritance.

Also C++ has exactly what you want. No interfaces, multiple inheritance. People don't utilize it unless it's a GUI lib.

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