> For the complete documentation index, see [llms.txt](https://osl.mistium.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://osl.mistium.com/standard-library/utilities.md).

# Utilities and data structures

Packages for data structures and utility types.

* [box2d](/standard-library/utilities/box2d.md) - Box2D-compatible rigid-body worlds, bodies, and fixtures.
* [events](/standard-library/utilities/events.md) - Named in-process events with thread-safe listeners.
* [map](/standard-library/utilities/map.md) - An ordered key-value map type.
* [set](/standard-library/utilities/set.md) - A set type.
* [option](/standard-library/utilities/option.md) - Optional values (`some`/`none`).
* [result](/standard-library/utilities/result.md) - Success/error result values.
* [retry](/standard-library/utilities/retry.md) - Bounded retries with exponential backoff and jitter.
* [ptr](/standard-library/utilities/ptr.md) - Low-level pointer operations.