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.
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