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SerenityOS author: "Rust is a neat language, but without inheritance and virtual dispatch, it's extremely cumbersome to build GUI applications" (mobile.twitter.com)

submitted 2 years ago by [email protected] to c/[email protected]

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Just sharing from r/rust

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[–] [email protected] 10 points 2 years ago (1 children)

Oh please not. Spare us from the C++ type-polymorphy nightmare. Traits are so much better than inheritance.

[–] [email protected] 7 points 2 years ago (1 children)

@kixik Inheritance can always be substituted by composition which is what #Rust does pretty well. Constexpr isn't on C++ level, but I guess you can generate code from build script so there's ways around it.
As for virtual functions - Traits are effectively to virtual function lookup table declarations that get used by dyn SomeTrait type. So calling a fn on Box\<dyn T\> generates VMT lookup.

[–] [email protected] 6 points 2 years ago

@kixik Thanks to good macro system Rust can (via enum_dispatch) transform those lookups into a switch statement which is best of both worlds IMO.