managed

A monad for managed values

Version on this page:1.0.3@rev:1
LTS Haskell 24.56:1.0.11
Stackage Nightly 2026-08-24:1.0.11
Latest on Hackage:1.0.11

See all snapshots managed appears in

BSD-3-Clause licensed by Gabriel Gonzalez
Maintained by [email protected]
This version can be pinned in stack with:managed-1.0.3@sha256:f350e935d9d1688e8c2880679b90fcf8b3c430fed49f7482b6396488a2b3ca5d,1432

Module documentation for 1.0.3

Depends on 2 packages(full list with versions):
base, transformers
Used by 2 packages in nightly-2016-03-29(full list with versions):
morte, turtle

In Haskell you very often acquire values using the with... idiom using functions of type (a -> IO r) -> IO r. This idiom forms a Monad, which is a special case of the ContT monad (from transformers) or the Codensity monad (from kan-extensions). The main purpose behind this package is to provide a restricted form of these monads specialized to this unusually common case.

The reason this package defines a specialized version of these types is to:

  • be more beginner-friendly,

  • simplify inferred types and error messages, and:

  • provide some additional type class instances that would otherwise be orphan instances