this post was submitted on 16 Oct 2024
67 points (98.6% liked)
Rust
5974 readers
77 users here now
Welcome to the Rust community! This is a place to discuss about the Rust programming language.
Wormhole
Credits
- The icon is a modified version of the official rust logo (changing the colors to a gradient and black background)
founded 1 year ago
MODERATORS
you are viewing a single comment's thread
view the rest of the comments
view the rest of the comments
I'd like to see a Rust solution to Tony Morris's tic tac toe challenge:
https://blog.tmorris.net/posts/scala-exercise-with-types-and-abstraction/index.html
His rant about it is here:
https://blog.tmorris.net/posts/understanding-practical-api-design-static-typing-and-functional-programming/
I did a Haskell GADT solution some time back and it's supposed to be doable in Java and in C++. Probably Rust too. I wonder about Ada.
This could be done almost trivially using the typestate pattern: https://zerotomastery.io/blog/rust-typestate-patterns/.
Neat that looks interesting. There's a similar Haskell idiom called session types. I have a bit of reservation about whether one can easily use Rust traits to mark out the permissible state sets that an operation can take, but that's because I don't know Rust at all. I do remember doing a hacky thing with TypeLits in Haskell to handle that. Basically you can have numbers in the type signatures and do some limited arithmetic with them at type level. I'd be interested to know if that is doable in Rust.
Rust has "const generics" which are, for example, used to pass the length of a fixed-length array via the type system. Apparently, const generics also do allow for some mild arithmetic.
https://doc.rust-lang.org/reference/items/generics.html#const-generics