Cell and RefCell

Interior mutability with Cell and RefCell.

Difficulty

Advanced

Code

use std::cell::RefCell;

fn main() {
    let data = RefCell::new(vec![1, 2, 3]);

    // borrow mutably
    data.borrow_mut().push(4);
    println!("{:?}", data.borrow());

    // borrow immutably multiple times is fine
    let r1 = data.borrow();
    let r2 = data.borrow();
    println!("{:?} {:?}", r1, r2);
}

Explanation

This example demonstrates how to use cell and refcell in Rust. Read the code carefully to understand the flow. Pay attention to where values are created, borrowed, moved, or consumed.

Key Concepts

• Rust's strong type system catches errors at compile time
• Ownership and borrowing rules ensure memory safety
• Pattern matching makes code expressive and exhaustive

Related Topics

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