stm-containers

Containers for STM

https://github.com/nikita-volkov/stm-containers

Version on this page:	0.2.16
LTS Haskell 24.16:	1.2.1.1
Stackage Nightly 2025-10-24:	1.2.1.1
Latest on Hackage:	1.2.1.1

See all snapshots stm-containers appears in

MIT licensed and maintained by Nikita Volkov

This version can be pinned in stack with:stm-containers-0.2.16@sha256:e98efa8dcf0045ea8a78a04b4e2763cf2d8bc33aad0750e2f30a67f8f4e933b1,8454

Module documentation for 0.2.16

STMContainers

Depends on 7 packages(full list with versions):

base, base-prelude, focus, hashable, list-t, primitive, transformers

Used by 3 packages in nightly-2017-12-10(full list with versions):

slave-thread, Spock, timemap

This library is based on an STM-specialized implementation of Hash Array Mapped Trie. It provides efficient implementations of Map, Set and other data structures, which are marginally slower than their counterparts from "unordered-containers", but scale well on concurrent access patterns.

For details on performance of the library see this blog post.