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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
      • Report Tweet
      • 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. Louis‏ @louispilfold Mar 30
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      Replying to @yoshuawuyts

      What's the bit you would expect not to work?

      1 reply 0 retweets 0 likes
    3. yosh‏ @yoshuawuyts Mar 30
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      Replying to @louispilfold

      Oh I didn't expect any of this to *not* work; but it's more that I only recently realized that encoding compiler-checked state machines in Rust is not only possible, we've been doing it all along. All we're missing really is better syntax, and I suspect enums can provide.

      2 replies 0 retweets 3 likes
      yosh‏ @yoshuawuyts Mar 30
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      Replying to @yoshuawuyts @louispilfold

      Some more background in this thread (which is also wrong, but think I found something that's probably less wrong):pic.twitter.com/SwkfTvTtJN

      2:33 PM - 30 Mar 2020
      • 1 Like
      • Alexander Varwijk 🦁
      2 replies 0 retweets 1 like
        1. New conversation
        2. Alexander Varwijk  🦁‏ @Kingdutch Mar 30
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          Replying to @yoshuawuyts @louispilfold

          I like the enum based implementation! Although the impl is a bit more obscure (fn overloading).

          2 replies 0 retweets 0 likes
        3. yosh‏ @yoshuawuyts Mar 30
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          Replying to @Kingdutch @louispilfold

          Haha, yeah: just to clarify -- that's currently not possible, and probably would never be (in the way that I wrote it out) because information is missing from the function signature. Was trying to link to a thread I wrote earlier, but looks like the Twitter UI rendered it weird

          1 reply 0 retweets 1 like
        4. 1 more reply
        1. New conversation
        2. Paul Faria‏ @Nashenas88 Mar 30
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          Replying to @yoshuawuyts @louispilfold

          Isn't that right image just a more verbose match?

          1 reply 0 retweets 1 like
        3. steveklabnik‏ @steveklabnik Mar 30
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          Replying to @Nashenas88 @yoshuawuyts @louispilfold

          It scales up for more complex cases. Imagine each type had its own disjoint methods, for example.

          0 replies 0 retweets 2 likes
        4. End of conversation

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