This crate is now deprecated in favor of slab.

A simple object arena.

You want to build a doubly linked list? Or maybe a bidirectional tree? Perhaps an even more complicated object graph?

Managing ownership and lifetimes might be tough then. Your options boil down to:

1. Use unsafe code to escape Rust's ownership rules.
2. Wrap every object in Rc<RefCell<T>>.
3. Use Vec<T> to store objects, then access them using indices.

If the last option seems most appealing to you, perhaps Arena<T> is for you. It will provide a more convenient API than a plain Vec<T>.

Some data structures built using Arena<T>:

• Doubly linked list
• Splay tree