| <?xml version='1.0' encoding='UTF-8'?> |
| <!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd"> |
| <pkgmetadata> |
| <herd>haskell</herd> |
| <longdescription> |
| 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. |
| |
| > 1.0.3 -> 1.0.4 |
| > - Bugfix to compile on GHC 6.12 again. |
| </longdescription> |
| <upstream> |
| <remote-id type="github">sebastiaanvisser/fclabels</remote-id> |
| </upstream> |
| </pkgmetadata> |