Filewatcher File Search File Search
Content Search
» » » » »


first-class accessor labels

This package provides first class labels that can act as bidirectional record fields. The labels can be derived automatically using Template Haskell which means you don't have to write any boilerplate yourself. The labels are implemented as lenses and are fully composable. Labels can be used to /get/, /set/ and /modify/ parts of a datatype in a consistent way.

See "Data.Label" for an introductory explanation.

Internally lenses are not tied to Haskell functions directly, but are implemented as arrows. Arrows allow the lenses to be run in custom computational contexts. This approach allows us to make partial lenses that point to fields of multi-constructor datatypes in an elegant way.

See the "Data.Label.Maybe" module for the use of partial labels.

> -> 1.1.2 > - Added partial set/modify versions that act as identity > when the constructor field is not available.

Author: Sebastiaan Visser, Erik Hesselink, Chris Eidhof, Sjoerd Visscher with lots of help and feedback from others. Upstream-Maintainer: Sebastiaan Visser <>

This package contains the normal library files.

Package version:1.1.3-1+b1


haskell-fclabels (1.1.3-1+b1) sid; urgency=low

  * Binary-only non-maintainer upload for i386; no source changes.
  * Rebuild against new transformers/mtl

 -- i386 Build Daemon (murphy) <>  Fri, 25 May 2012 17:05:11 +0000

haskell-fclabels (1.1.3-1) unstable; urgency=low

  * Initial release.

 -- Clint Adams <>  Thu, 17 May 2012 22:30:28 -0400


Copyright (c) Erik Hesselink & Sebastiaan Visser 2008

All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
   notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce 

Browse inside libghc-fclabels-dev_1.1.3-1+b1_i386.deb

         [DIR]DEBIAN/ (2)  65535+ mirrors
         [DIR]usr/ (2)  65535+ mirrors
         [DIR]var/ (1)  41013+ mirrors

Download libghc-fclabels-dev_1.1.3-1+b1_i386.deb

Results 1 - 1 of 1
Help - FTP Sites List - Software Dir.
Search over 15 billion files
© 1997-2017