isabella232 / redblacktree

Red-Black Trees in Swift

Red-Black Trees in Swift

This project provides an implementation of red-black trees in pure Swift as structs with value semantics. The nodes are stored in bulk inside a single flat Array, with array indexes serving as pointers.

RedBlackTree supports value-based lookup, positional lookup, or a combination of both, depending on how you configure its key type, RedBlackKey. For example, you can create a single red-black tree that supports lookup based on either a key stored in each element, the position of the element, or a weighted position.

I created this package to make a set of ordered collection types in Swift. However, benchmarking showed that the performance of red-black trees isn't great, and I chose to base my collection types on b-trees instead. If you're in need of a fast ordered collection type, be sure check out my BTree project before settling on red-black trees.