23 lines
757 B
Plaintext
23 lines
757 B
Plaintext
use std::cell::Cell;
|
|
use std::cell::RefCell;
|
|
use std::rc::Rc;
|
|
use std::rc::Weak;
|
|
|
|
fn a(k: i32, x1: &Fn() -> i32, x2: &Fn() -> i32, x3: &Fn() -> i32, x4: &Fn() -> i32, x5: &Fn() -> i32) -> i32 {
|
|
let weak_holder: Rc<RefCell<Weak<Fn() -> i32>>> = Rc::new(RefCell::new(Weak::<fn() -> i32>::new()));
|
|
let weak_holder2 = weak_holder.clone();
|
|
let k_holder = Cell::new(k);
|
|
let b: Rc<Fn() -> i32> = Rc::new(move || {
|
|
let b = weak_holder2.borrow().upgrade().unwrap();
|
|
k_holder.set(k_holder.get() - 1);
|
|
return a(k_holder.get(), &*b, x1, x2, x3, x4);
|
|
});
|
|
weak_holder.replace(Rc::downgrade(&b));
|
|
|
|
return if k <= 0 {x4() + x5()} else {b()}
|
|
}
|
|
|
|
pub fn main() {
|
|
println!("{}", a(10, &||1, &||-1, &||-1, &||1, &||0));
|
|
}
|