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use std::collections::HashMap;
use std::sync::Mutex;
// vector describing speed in x,y dimensions
pub type Speed = (usize, usize);
pub struct Robo {
speed: Mutex<Speed>,
}
impl Robo {
pub fn new() -> Self {
Self {
speed: Mutex::new((0, 0)),
}
}
pub fn make_ins(&mut self) -> HashMap<&'static str, Box<dyn FnMut() + '_>> {
let mut map = HashMap::new();
let s = &mut self.speed;
let op_speed = || {
let mut x =
s.lock().expect("couldn't get lock on speed");
*x = (1, 1);
};
let op_speed2 = || {
let mut x =
s.lock().expect("couldn't get lock on speed");
*x = (2, 2);
};
map.insert("move", Box::new(op_speed) as Box<dyn FnMut()>);
map.insert("move2", Box::new(op_speed2) as Box<dyn FnMut()>);
map
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn can_run_two() {
let mut r = Robo::new();
{
let hm = &mut r.make_ins();
let fun = hm.get_mut("move").expect("move should exist");
fun();
}
let s = r.speed.lock().expect("couldn't get lock on speed");
assert_eq!(*s, (1, 1));
drop(s);
{
let hm = &mut r.make_ins();
let fun = hm.get_mut("move2").expect("move2 should exist");
fun();
}
let s = r.speed.lock().expect("couldn't get lock on speed");
assert_eq!(*s, (2, 2));
drop(s);
}
}
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