stm-containers

Containers for STM

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

LTS Haskell 24.27:	1.2.2
Stackage Nightly 2026-01-07:	1.2.2
Latest on Hackage:	1.2.2

See all snapshots stm-containers appears in

MIT licensed and maintained by Nikita Volkov

This version can be pinned in stack with:stm-containers-1.2.2@sha256:3dc0885bb2cbab613ad4308d82fd8d252b9df623005a86e7992936be63219e0a,3505

Module documentation for 1.2.2

StmContainers

Depends on 7 packages(full list with versions):

base, deferred-folds, focus, hashable, list-t, stm-hamt, transformers

Used by 2 packages in nightly-2026-01-06(full list with versions):

keter-rate-limiting-plugin, slave-thread

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 starting from version 1 perform even better than their counterparts from "unordered-containers", but also scale well on concurrent access patterns. . For details on performance of the library, which are a bit outdated, see this blog post.