Amazed at how well this works really.pic.twitter.com/h55RuLdmya
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Amazed at how well this works really.pic.twitter.com/h55RuLdmya
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.
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).
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.
I'm not familiar with the terms DFA and NFA; can you elaborate?
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.
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)
Yes, that's accurate. To be clear, the state explosion cannot be avoided. The lazy DFA just avoids paying for it in memory. If your input triggers the state explosion, then the lazy DFA will still use a bounded amount of memory, but will slow down quite a bit.
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