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:

This package provides two modules:

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

For an example of how to use this library see the safer-file-handles or usb-safe packages.


Versions0.1,, 0.2, 0.3, 0.4, 0.5, 0.6,, 0.7,, 0.8, 0.8.1, 0.9, 0.10, 0.11
Change logNone available
Dependenciesbase (>=4 && <4.3), base-unicode-symbols (>=0.1.1 && <0.2), MonadCatchIO-transformers (==0.0.2.*), transformers (>=0.1.4 && <0.2) [details]
Copyright2009 Bas van Dijk
AuthorBas van Dijk
MaintainerBas van Dijk <>
CategoryControl, Monadic Regions
Source repositoryhead: darcs get
UploadedSat Jan 23 14:25:08 UTC 2010 by BasVanDijk
Downloads2296 total (108 in last 30 days)
0 []
StatusDocs uploaded by user
Build status unknown [no reports yet]




Maintainers' corner

For package maintainers and hackage trustees