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Announcing Rust 1.76.0 (blog.rust-lang.org)

submitted 7 months ago by [email protected] to c/[email protected]

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[–] [email protected] 1 points 7 months ago (3 children)

So rust finally gets reflection? In stable no less!

[–] [email protected] 15 points 7 months ago (1 children)

Well, if the only thing you need from reflection is the name of a type, so then yes. But I wouldn't really call this reflection since it is very limited.

[–] [email protected] 9 points 7 months ago (1 children)

Yeah, Rust can't have proper reflection, since there's no external runtime environment that keeps track of your state. Any such smartness either has to be compiled-in (which is how std::any and macros work) or you can implement something to keep track of this state at runtime, as if you were partially building a runtime environment.

[–] [email protected] 12 points 7 months ago (2 children)

Minor point of clarification: it can't have runtime reflection, but in principle it could have compile time reflection.

[–] [email protected] 1 points 7 months ago

And compile-time reflection will probably also continue to suck due to some irreconcilable limitations of type-safe generic specialization. Oh how I would love an equivalent to C++ template parameter packs…

[–] [email protected] 0 points 7 months ago (2 children)

No, the Rust Project recently made sure that Rust can't have compile-time reflection.

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

Can you expand on this? I'd love to read more on the subject.

[–] [email protected] -1 points 7 months ago

Here is a short summary. The compile-time reflection project was stopped, and now nobody wants to touch that subject any more due to fear of getting the wrath of the Rust project again (the person responsible for the whole thing is still part of the leadership).

[–] [email protected] 1 points 7 months ago

...yeah, that's really unfortunate. Part of why I said "in principle".

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

@bwrsandman @snaggen More a RTTI than reflection...

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

Isn't RTTI for polymorphic classes and stored in (or around) vtables?

[–] [email protected] 2 points 7 months ago

@bwrsandman That's why I used ”More a” than ”Is a”... 😉

[–] [email protected] 1 points 7 months ago

Unfortunately, it's not guaranteed to be the same string all the time, so it's rather useless for anything but debugging and logging.