Post #2612501
2023-12-02 19:15 UTC
Whoop! 🎉 Continuing this series, we'll (very likely) get `dyn (trait) upcasting` in #Rust 1.76! :awesome: 🎡
I've accidentally stumbled upon this (😄), while trying to answer @luna@lunar.place's question here:
https://floss.social/@luna@lunar.place/111511081757642056
It basically allows you to upcast trait objects.
See the original RFC (with some nice examples on when you need this)...:
https://github.com/rust-lang/rfcs/blob/master/text/3324-dyn-upcasting.md
...and it's tracking issue:
https://github.com/rust-lang/rust/issues/65991
#RustLang
Replies (2)
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@luna@lunar.place 2023-12-02 20:17
@janriemer@floss.social Ooo this is exciting, will this mean that it will work like i expected it to in my post?
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@Corax42@mastodon.social 2023-12-28 20:32
@janriemer@floss.social @luna@lunar.place I remember the first time I tried Rust in the playground. Being a boring Java developer, I immediately proceeded to make trait objects and pass them into generic functions. My joy was quickly frustrated; first by learning that pretty much every generic library function has implicit Sized bounds on its type parameters, next by realizing that it was literally impossible to upcast a &dyn. I've made my peace with static dispatch by now, but back then, I was genuinely shocked ^^