leodos_protocols/utils/
cell.rs

1use core::cell::RefCell;
2
3/// Interior-mutable cell that only allows access through sync closures.
4///
5/// Wraps `RefCell<T>` but restricts borrows to non-`async` closures,
6/// making it a compile error to hold a borrow across an `.await` point.
7pub(crate) struct SyncRefCell<T>(RefCell<T>);
8
9impl<T> SyncRefCell<T> {
10    pub(crate) fn new(val: T) -> Self {
11        Self(RefCell::new(val))
12    }
13
14    #[allow(dead_code)]
15    pub(crate) fn with<F, R>(&self, f: F) -> R
16    where
17        F: FnOnce(&T) -> R,
18    {
19        f(&self.0.borrow())
20    }
21
22    pub(crate) fn with_mut<F, R>(&self, f: F) -> R
23    where
24        F: FnOnce(&mut T) -> R,
25    {
26        f(&mut self.0.borrow_mut())
27    }
28}

leodos_protocols/utils/cell.rs

leodos_protocols/utils/
cell.rs