managed

A monad for managed values

Version on this page:	1.0.0@rev:1
LTS Haskell 19.18:	1.0.9@rev:1
Stackage Nightly 2022-08-04:	1.0.9@rev:1
Latest on Hackage:	1.0.9@rev:1

See all snapshots managed appears in

BSD-3-Clause licensed by Gabriel Gonzalez

Maintained by Gabriel439@gmail.com

This version can be pinned in stack with:managed-1.0.0@sha256:e785d7abda6ca46246fcb4531202a68c71a17c0f1bfffe07bbcf7408bf0b1986,1433

Module documentation for 1.0.0

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

Depends on 2 packages(full list with versions):

base, transformers

Used by 1 package in lts-2.22(full list with versions):

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