STMonadTrans

A monad transformer version of the ST monad

Version on this page:	0.4
LTS Haskell 24.56:	0.4.8.1
Stackage Nightly 2026-08-24:	0.4.8.1
Latest on Hackage:	0.4.8.1

See all snapshots STMonadTrans appears in

BSD-3-Clause licensed by Josef Svenningsson

Maintained by [email protected]

This version can be pinned in stack with:STMonadTrans-0.4@sha256:a892887df779b2c114af0a7401275e6d4c0be8ccce64fea2bf3a4970ca6cf3cf,1370

Module documentation for 0.4

Control
- Control.Monad
  - Control.Monad.ST
    - Control.Monad.ST.Trans
      - Control.Monad.ST.Trans.Internal

Depends on 3 packages(full list with versions):

array, base, mtl

Used by 1 package in nightly-2017-02-05(full list with versions):

equivalence

A monad transformer version of the ST monad Warning! This monad transformer should not be used with monads that can contain multiple answers, like the list monad. The reason is that the state token will be duplicated across the different answers and this causes Bad Things to happen (such as loss of referential transparency). Safe monads include the monads State, Reader, Writer, Maybe and combinations of their corresponding monad transformers.