The regions package

[Tags:bsd3, library]

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:

Also see the regions-mtl and regions-monadstf packages which provide instances for the classes in the respected monad transformers packages.

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


Versions 0.1,, 0.2, 0.3, 0.4, 0.5, 0.6,, 0.7,, 0.8, 0.8.1, 0.9, 0.10, 0.11
Dependencies base (>=4 && <4.4), base-unicode-symbols (>=0.1.1 && <0.3), monad-peel (==0.1.*), transformers (==0.2.*) [details]
License BSD3
Copyright 2009-2010 Bas van Dijk
Author Bas van Dijk
Maintainer Bas van Dijk <>
Stability experimental
Category Control, Monadic Regions
Source repository head: darcs get
Uploaded Mon Jan 17 22:04:15 UTC 2011 by BasVanDijk
Distributions NixOS:0.11
Downloads 3005 total (49 in the last 30 days)
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Status Docs uploaded by user
Build status unknown [no reports yet]




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