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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.
> 126.96.36.199 -> 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 <firstname.lastname@example.org>
This package contains the normal library files.
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) <email@example.com> Fri, 25 May 2012 17:05:11 +0000 haskell-fclabels (1.1.3-1) unstable; urgency=low * Initial release. -- Clint Adams <firstname.lastname@example.org> Thu, 17 May 2012 22:30:28 -0400 more»
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 more»