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yoshuawuyts's profile
yosh
yosh
yosh
@yoshuawuyts

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yosh

@yoshuawuyts

Software researcher. he/they

Berlin, UTC+2
blog.yoshuawuyts.com
Joined May 2009

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    1. yosh‏ @yoshuawuyts Mar 30
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      • Report NetzDG Violation

      Amazed at how well this works really.pic.twitter.com/h55RuLdmya

      // ad-hoc enum definition
#[derive(Debug)]
pub struct Green;
#[derive(Debug)]
pub struct Yellow;
#[derive(Debug)]
pub struct Red;

#[derive(Debug)]
struct State<S> {
    _inner: S
}

impl State<Green> {
    pub fn new() -> State<Green> {
        State { _inner: Green{} }
    }
}

impl State<Green> {
    pub fn next(self) -> State<Yellow> {
        State { _inner: Yellow {} }
    }
}


impl State<Yellow> {
    pub fn
      25 replies 18 retweets 170 likes
      Show this thread
    2. yosh‏ @yoshuawuyts Mar 30
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      playground link if you want to try it: https://play.rust-lang.org/?version=stable&mode=debug&edition=2018&gist=9ac3f0d23b98a28dd94e12fb0f1a30ab … This is def one of those cases where Rust's typesystem feels like magic to me.

      3 replies 0 retweets 14 likes
      Show this thread
    3. yosh‏ @yoshuawuyts Mar 30
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      For anyone wondering: "what am I looking at?" It's a state machine for a traffic light, checked at compile time. Green -> Yellow -> Red -> Green by triggering the "next" event on it (e.g. calling a method).

      2 replies 0 retweets 9 likes
      Show this thread
    4. Vincent Esche‏ @regexident Mar 30
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      Replying to @yoshuawuyts

      What you have there is essentially an instance of the “session types” pattern in Rust: https://munksgaard.me/papers/laumann-munksgaard-larsen.pdf … https://github.com/Munksgaard/session-types … It’s nice for modeling DFAs, but insufficient for NFAs.

      1 reply 1 retweet 1 like
      yosh‏ @yoshuawuyts Mar 31
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      Replying to @regexident

      I'm not familiar with the terms DFA and NFA; can you elaborate?

      1:26 AM - 31 Mar 2020 from Berlin, Germany
      • 1 Like
      • nop3
      2 replies 0 retweets 1 like
        1. New conversation
        2. Vincent Esche‏ @regexident Mar 31
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          Replying to @yoshuawuyts

          DFA: Deterministic Finite Automaton NFA: Non-Deterministic Finite Automaton In an NFA an event may transition to multiple different destination states, while in a DFA an event must have a deterministic destination. The NFA basically has an additional runtime aspect to it.

          1 reply 0 retweets 2 likes
        3. Vincent Esche‏ @regexident Mar 31
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          Replying to @regexident @yoshuawuyts

          Worth noting that every NFA can be turned into a DFA, which is a common operation in regex engines. The regex crate interestingly (afaik) uses a dynamic mix of both, as the conversion can cause a state explosion, which can become a problem. (cc @burntsushi5)

          1 reply 0 retweets 3 likes
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        2. Florian Gilcher ∠(・.-)―〉 →◎‏ @Argorak Mar 31
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          Replying to @yoshuawuyts @regexident

          Both are "Finite Automatons" (state machines), but with the difference that in DFA (deterministic), one transition is allowed per input. In NFA (Non-Deterministic), an input may trigger _multiple_ transitions, essentially allowing the process to "split".

          1 reply 0 retweets 2 likes
        3. Florian Gilcher ∠(・.-)―〉 →◎‏ @Argorak Mar 31
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          Replying to @Argorak @yoshuawuyts @regexident

          Imagine the regex "nun|nan". That could be described in an NFA as "if you read 'n', your either in the left path or the right path, but it hasn't been determined yet", in DFA, this isn't allowed.

          0 replies 0 retweets 2 likes
        4. End of conversation

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