m02-resource

To choose between Box, Rc, and Arc for Rust ownership, use Box for single-owner heap allocation, Rc for single-thread shared ownership, and Arc for multi-thread shared ownership.

Use RefCell or Cell for interior mutability in Rust when you need mutable access inside shared data; RefCell provides runtime borrow checking for single-thread contexts, while Cell is for simple Copy types.

Avoid reference cycles when building graphs with Rc in Rust by using Weak pointers to break strong reference cycles, preventing memory leaks while still allowing temporary access to the graph nodes.

The best way to share mutable Rust data structures across threads is using Arc combined with Mutex to provide thread-safe shared ownership and synchronized interior mutability for concurrent access.

Rust smart pointer selection differs by thread context: Rc and RefCell suit single-thread scenarios, while Arc and Mutex are required for multi-thread environments to ensure safe concurrent access.

Converting a tree from Box to Rc<RefCell<Node>> helps with traversal by enabling shared ownership and interior mutability, allowing multiple parts of your code to traverse and mutate the tree structure simultaneously.