sm

SM aims to be a safe, fast and simple state machine library.

• safe — Rust's type system, ownership model and exhaustive pattern matching prevent you from mis-using your state machines

• fast — zero runtime overhead, the machine is 100% static, all validation happens at compile-time

• simple — five traits, and one optional declarative macro, control-flow only, no business logic attached

You might be looking for:

• An overview of SM
• Our GitHub repository
• Examples
• API documentation

Quick Example

extern crate sm;
use sm::sm;

sm! {
    Lock {
        InitialStates { Locked }

        TurnKey {
            Locked => Unlocked
            Unlocked => Locked
        }

        Break {
            Locked, Unlocked => Broken
        }
    }
}

fn main() {
    use Lock::*;
    let lock = Machine::new(Locked);
    let lock = lock.transition(TurnKey);

    assert_eq!(lock.state(), Unlocked);
    assert_eq!(lock.trigger().unwrap(), TurnKey);
}