How to handle borrow checker implementing `Rc<RefCell<T>>` in Rust Core?
I just started working with I've searched everywhere and can't find a clear answer... I'm working with some issues with managing mutable state in Rust using the `Rc<RefCell<T>>` combination. My goal is to create a simple counter that can be shared and mutated across multiple parts of my application. However, I'm running into borrow checker errors that I need to seem to resolve. Here’s a simplified version of what I’ve tried: ```rust use std::rc::Rc; use std::cell::RefCell; struct Counter { value: i32, } impl Counter { fn increment(&mut self) { self.value += 1; } } fn main() { let counter = Rc::new(RefCell::new(Counter { value: 0 })); let counter_clone = Rc::clone(&counter); let handle = std::thread::spawn(move || { let mut c = counter_clone.borrow_mut(); c.increment(); }); handle.join().unwrap(); println!("Counter value: {}", counter.borrow().value); } ``` When I run the above code, I get the following behavior: ``` behavior[E0500]: want to borrow `*counter` as mutable because it is also borrowed as immutable ``` I believe this is happening because I'm trying to borrow the `counter` mutably and immutably at the same time, but I don't know how to manage these lifetimes correctly, especially when using threads. I’ve tried restructuring my code and using locks, but I keep running into similar issues. How can I properly mutate the `Counter` across threads using `Rc<RefCell<T>>`? Would using `Arc<Mutex<T>>` be a better approach in this scenario, or is there a way to resolve it without changing my current design? I'm using Rust 1.58.0. Any insights or examples would be greatly appreciated! I'm working on a API that needs to handle this. Any ideas what could be causing this?