regions: Provides the region monad for safely opening and working with scarce resources.

[ bsd3, control, library, monadic-regions ] [ Propose Tags ]

This package provides the region monad transformer. Scarce resources like files, memory pointers or USB devices for example can be opened in a region. When the region terminates, all opened resources will be automatically closed. The main advantage of regions is that the opened resources can not be returned from the region which ensures no I/O with closed resources is possible.

The primary technique used in this package is called "Lightweight monadic regions" which was invented by Oleg Kiselyov and Chung-chieh Shan. See:

http://okmij.org/ftp/Haskell/regions.html#light-weight

Also see the regions-monadsfd and regions-monadstf packages which provide instances for the classes in the respected monads packages.

For an example on how to use this library see the safer-file-handles, usb-safe or regional-pointers packages.

Note that if you want to open your type of scarce resource in a region, the only thing you have to do is define an instance for the Resource class (which you can find in: Control.Resource).

Downloads

Maintainer's Corner

Package maintainers

For package maintainers and hackage trustees

Candidates

  • No Candidates
Versions [RSS] 0.1, 0.1.0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.6.0.1, 0.7, 0.7.0.1, 0.8, 0.8.1, 0.9, 0.10, 0.11
Dependencies base (>=4 && <4.3), base-unicode-symbols (>=0.1.1 && <0.2), MonadCatchIO-transformers (>=0.0.2.0 && <0.1), transformers (>=0.1.4 && <0.2) [details]
License BSD-3-Clause
Copyright 2010 Bas van Dijk
Author Bas van Dijk
Maintainer Bas van Dijk <v.dijk.bas@gmail.com>
Category Control, Monadic Regions
Source repo head: darcs get http://code.haskell.org/~basvandijk/code/regions
Uploaded by BasVanDijk at 2010-02-04T10:17:47Z
Distributions
Reverse Dependencies 10 direct, 0 indirect [details]
Downloads 12164 total (35 in the last 30 days)
Rating (no votes yet) [estimated by Bayesian average]
Your Rating
  • λ
  • λ
  • λ
Status Docs uploaded by user
Build status unknown [no reports yet]