small_fsm/
action.rs

1use crate::event::Event;
2use std::fmt::Debug;
3use std::rc::Rc as Shared;
4
5/// Action is the trait for callbacks.
6pub trait Action<S, I>: Debug {
7    type Err: std::error::Error;
8    fn call(&self, e: &Event<S, I>) -> Result<(), Self::Err>;
9}
10
11type WrapFn<'a, S, I, E> = Shared<dyn Fn(&Event<S, I>) -> Result<(), E> + 'a>;
12
13/// Closure is a wrapper around a closure that implements the Action trait.
14/// unsupport thread-safe
15pub struct Closure<'a, S, I, E>(pub(crate) WrapFn<'a, S, I, E>);
16
17impl<'a, S, I, E> Closure<'a, S, I, E> {
18    pub fn new<F>(f: F) -> Self
19    where
20        F: Fn(&Event<S, I>) -> Result<(), E> + 'a,
21    {
22        Self(Shared::new(f))
23    }
24}
25
26impl<'a, S, I, E: std::error::Error> Action<S, I> for Closure<'a, S, I, E> {
27    type Err = E;
28    fn call(&self, e: &Event<S, I>) -> Result<(), Self::Err> {
29        (self.0)(e)
30    }
31}
32
33impl<'a, S, I, E> Debug for Closure<'a, S, I, E> {
34    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
35        write!(f, "<Closure>")
36    }
37}
38
39impl<'a, S, I, E> Clone for Closure<'a, S, I, E> {
40    fn clone(&self) -> Self {
41        Self(self.0.clone())
42    }
43}
small_fsm/action.rs

small_fsm/
action.rs
