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As someone not terribly familiar with the literature but familiar with Rust's type system, I just spend a few minutes googling various pages about region based

by comex 12y ago

As someone not terribly familiar with the literature but familiar with Rust's type system, I just spend a few minutes googling various pages about region based memory management (including Tofte + Talpin) as well as skimming your link (not very hard, I admit), and I don't really understand what it lets you do (that doesn't exist in a roughly analogous form in Rust). Well, there's the fact that most of the papers describe region inference, while Rust is fully explicit, but that doesn't seem critical to the scheme to me. Out of curiosity, I'd be interested to see you elaborate on the difference. Also, I do not know what other 'PLs with similar facilities' exist with anywhere near as much effort put into them (other than Cyclone, which is dead). You mentioned C++, but it doesn't have lifetime checking at all, which is of course a core feature of Rust...

coolsunglasses 12y ago
C++ doesn't cover the full extent of safety Rust offers at all, but there is a fair bit of overlap in how the functionality is packaged up WRT ownership types. I checked the docs and it looks like at least http://doc.rust-lang.org/0.12.0/guide-lifetimes.html#named-lifetimes http://doc.rust-lang.org/0.12.0/guide-lifetimes.html#named-l... is covered which was one of my objections. I still don't like that I can't design my own linearly typed constraints, but it appears that was never a goal to begin with. Not surprising given the lack of emphasis on expressive types. As it stands my only options for linear'ish types are indexed Monads in Haskell or building a model of linear types in a proof assistant or DTPL.
- Manishearth 12y ago
  I and some others are working on a rough approximation to linear types here: https://github.com/Manishearth/humpty_dumpty https://github.com/Manishearth/humpty_dumpty A perfect implementation can be added to the language, but getting it to work perfectly with backcompat is hard so it might be made in 2.0.

by comex 12y ago

coolsunglasses 12y ago

C++ doesn't cover the full extent of safety Rust offers at all, but there is a fair bit of overlap in how the functionality is packaged up WRT ownership types. I checked the docs and it looks like at least http://doc.rust-lang.org/0.12.0/guide-lifetimes.html#named-lifetimes http://doc.rust-lang.org/0.12.0/guide-lifetimes.html#named-l... is covered which was one of my objections. I still don't like that I can't design my own linearly typed constraints, but it appears that was never a goal to begin with. Not surprising given the lack of emphasis on expressive types. As it stands my only options for linear'ish types are indexed Monads in Haskell or building a model of linear types in a proof assistant or DTPL.

Manishearth 12y ago
I and some others are working on a rough approximation to linear types here: https://github.com/Manishearth/humpty_dumpty https://github.com/Manishearth/humpty_dumpty A perfect implementation can be added to the language, but getting it to work perfectly with backcompat is hard so it might be made in 2.0.