| Name : ghc-microlens
| |
| Version : 0.4.12.0
| Vendor : openSUSE
|
| Release : bp154.1.12
| Date : 2022-05-09 12:25:56
|
| Group : Unspecified
| Source RPM : ghc-microlens-0.4.12.0-bp154.1.12.src.rpm
|
| Size : 0.13 MB
| |
| Packager : https://bugs_opensuse_org
| |
| Summary : A tiny lens library with no dependencies
|
Description :
NOTE: If you\'re writing an app, you probably want
< http://hackage.haskell.org/package/microlens-platform microlens-platform> – it
has the most features. < http://hackage.haskell.org/package/microlens microlens>
is intended more for library writers who want a tiny lens library (after all,
lenses are pretty useful for everything, not just for updating records!).
This library is an extract from < http://hackage.haskell.org/package/lens lens>
(with no dependencies). It\'s not a toy lenses library, unsuitable for “real
world”, but merely a small one. It is compatible with lens, and should have
same performance. It also has better documentation.
There\'s a longer readme < https://github.com/monadfix/microlens#readme on
Github>. It has a migration guide for lens users, a description of other
packages in the family, a discussion of other lens libraries you could use
instead, and so on.
Here are some usecases for this library:
* You want to define lenses or traversals in your own library, but don\'t want
to depend on lens. Having lenses available often make working with a library
more pleasant.
* You just want to be able to use lenses to transform data (or even just use
\'over _1\' to change the first element of a tuple).
* You are new to lenses and want a small library to play with.
However, don\'t use this library if:
* You need \'Iso\'s, \'Prism\'s, indexed traversals, or actually anything else
which isn\'t defined here (though some indexed functions are available elsewhere
– containers and vector provide them for their types, and
< http://hackage.haskell.org/package/ilist ilist> provides indexed functions for
lists).
* You want a library with a clean, understandable implementation (in which case
you\'re looking for < http://hackage.haskell.org/package/lens-simple
lens-simple>).
As already mentioned, if you\'re writing an application which uses lenses more
extensively, look at < http://hackage.haskell.org/package/microlens-platform
microlens-platform> – it combines features of most other microlens packages
(< http://hackage.haskell.org/package/microlens-mtl microlens-mtl>,
< http://hackage.haskell.org/package/microlens-th microlens-th>,
< http://hackage.haskell.org/package/microlens-ghc microlens-ghc>).
If you want to export getters or folds and don\'t mind the
< http://hackage.haskell.org/package/contravariant contravariant> dependency,
please consider using < http://hackage.haskell.org/package/microlens-contra
microlens-contra>.
If you haven\'t ever used lenses before, read
< http://hackage.haskell.org/package/lens-tutorial/docs/Control-Lens-Tutorial.html
this tutorial>. (It\'s for lens, but it applies to microlens just as well.)
Note that microlens has no dependencies starting from GHC 7.10 (base-4.8).
Prior to that, it depends on transformers-0.2 or above.
|
RPM found in directory: /packages/linux-pbone/ftp5.gwdg.de/pub/opensuse/repositories/openSUSE:/Backports:/SLE-15-SP4/standard/x86_64 |
