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extern crate alloc;
use alloc::rc::Rc;
use core::cell::RefCell;
use hashbrown::HashMap;
use kasuari::Variable;
#[derive(Clone, Default)]
struct Values(Rc<RefCell<HashMap<Variable, f64>>>);
impl Values {
fn value_of(&self, var: Variable) -> f64 {
*self.0.borrow().get(&var).unwrap_or(&0.0)
}
fn update_values(&self, changes: &[(Variable, f64)]) {
for (var, value) in changes {
println!("{var:?} changed to {value:?}");
self.0.borrow_mut().insert(*var, *value);
}
}
}
#[allow(clippy::type_complexity)]
pub fn new_values() -> (
Box<dyn Fn(Variable) -> f64>,
Box<dyn Fn(&[(Variable, f64)])>,
) {
let values = Values(Rc::new(RefCell::new(HashMap::new())));
let value_of = {
let values = values.clone();
move |v| values.value_of(v)
};
let update_values = {
let values = values.clone();
move |changes: &[_]| {
values.update_values(changes);
}
};
(Box::new(value_of), Box::new(update_values))
}
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