managed

A monad for managed values

LTS Haskell 14.17:	1.0.6
Stackage Nightly 2019-12-13:	1.0.6
Latest on Hackage:	1.0.6

See all snapshots managed appears in

BSD-3-Clause licensed by Gabriel Gonzalez

Maintained by Gabriel439@gmail.com

Module documentation for 1.0.6

This version can be pinned in stack with:managed-1.0.6@sha256:1da884195081d70b6bec475db985017431eb42564bf648ad6968640ddafe25b0,1535

Control
- Control.Monad
  - Control.Monad.Managed
    - Control.Monad.Managed.Safe

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

Depends on 2 packages(full list with versions):

transformers

Used by 1 package in nightly-2019-11-20(full list with versions):

turtle