managed

A monad for managed values

Version on this page:1.0.2
LTS Haskell 24.27:1.0.11
Stackage Nightly 2026-01-09:1.0.11
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-1.0.2@sha256:960bd5a939c0ec720f8c367963a286dc224e5e7a825187405cd3bff670230aa9,1418

Module documentation for 1.0.2

Depends on 2 packages(full list with versions):
base, transformers
Used by 2 packages in lts-5.0(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