3 releases
Uses new Rust 2024
new 0.1.1 | May 24, 2025 |
---|---|
0.1.0 | May 23, 2025 |
0.1.0-beta.1 | May 20, 2025 |
#829 in Rust patterns
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17KB
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BetterRefCell
A drop-in replacement for RefCell
with safe unborrow and reborrow capabilities.
Features
- Allows putting back a borrowed value and reborrowing it within a closure.
- Fully compatible with the
RefCell
interface of the stable Rust standard library. - Zero dependencies.
Usage
use better_refcell::BetterRefCell;
use std::cell::*;
let cell = BetterRefCell::new(42);
let mut guard: RefMut<i32> = cell.borrow_mut();
let mut_reference: &mut i32 = &mut *guard;
let ret = cell.unborrow(mut_reference, || {
let mut guard = cell.borrow_mut();
assert_eq!(*guard, 42);
*guard += 1;
format!("Returns {guard}")
});
assert_eq!(*guard, 43);
assert_eq!(ret, "Returns 43");
License
This project is dual-licensed under either the MIT or Apache-2.0 license, at your option.