diff options
| author | V3n3RiX <venerix@redcorelinux.org> | 2018-07-14 20:57:42 +0100 |
|---|---|---|
| committer | V3n3RiX <venerix@redcorelinux.org> | 2018-07-14 20:57:42 +0100 |
| commit | 1798c4aeca70ac8d0a243684d6a798fbc65735f8 (patch) | |
| tree | e48e19cb6fa03de18e1c63e1a93371b7ebc4eb56 /dev-haskell/semigroupoids/metadata.xml | |
| parent | d87262dd706fec50cd150aab3e93883b6337466d (diff) | |
gentoo resync : 14.07.2018
Diffstat (limited to 'dev-haskell/semigroupoids/metadata.xml')
| -rw-r--r-- | dev-haskell/semigroupoids/metadata.xml | 74 |
1 files changed, 0 insertions, 74 deletions
diff --git a/dev-haskell/semigroupoids/metadata.xml b/dev-haskell/semigroupoids/metadata.xml deleted file mode 100644 index d6c06edca015..000000000000 --- a/dev-haskell/semigroupoids/metadata.xml +++ /dev/null @@ -1,74 +0,0 @@ -<?xml version="1.0" encoding="UTF-8"?> -<!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd"> -<pkgmetadata> - <maintainer type="project"> - <email>haskell@gentoo.org</email> - <name>Gentoo Haskell</name> - </maintainer> - <longdescription> - Provides a wide array of semigroupoids and operations for working with semigroupds. - - A Semigroupoid is a Category without the requirement of identity arrows for every object in the category. - - When working with comonads you often have the @\<*\>@ portion of an @Applicative@, but - not the @pure@. This was captured in Uustalu and Vene's \"Essence of Dataflow Programming\" - in the form of the @ComonadZip@ class in the days before @Applicative@. Apply provides a weaker invariant, but for the comonads used for data flow programming (found in the streams package), this invariant is preserved. Applicative function composition forms a semigroupoid. - - Similarly many structures are nearly a comonad, but not quite, for instance lists provide a reasonable 'extend' operation in the form of 'tails', but do not always contain a value. - - - Ideally the following relationships would hold: - - > Traversable <---- Foldable <--- Functor ------> Alt ---------> Plus Semigroupoid - > | | | | | - > v v v v v - > Traversable1 <--- Foldable1 Apply --------> Applicative -> Alternative Category - > | | | | - > v v v v - > Bind ---------> Monad -------> MonadPlus Arrow - > - - Apply, Bind, and Extract give rise the Static, Kleisli and Cokleisli semigroupoids respectively. - - This lets us remove many of the restrictions from various monad transformers - as in many cases the binding operation or @\<*\>@ operation does not require them. - - Finally, to work with these weaker structures it is beneficial to have containers - that can provide stronger guarantees about their contents, so versions of 'Traversable' - and 'Foldable' that can be folded with just a 'Semigroup' are added. - </longdescription> - <use> - <flag name="comonad"> - You can disable the use of the `comonad` package using - `-f-comonad`. Disabling this is an unsupported configuration, but it may be - useful for accelerating builds in sandboxes for expert users. If disabled we - will not supply instances of `Comonad` - </flag> - <flag name="containers"> - You can disable the use of the `containers` package - using `-f-containers`. Disabing this is an unsupported configuration, but it - may be useful for accelerating builds in sandboxes for expert users. - </flag> - <flag name="contravariant"> - You can disable the use of the `contravariant` - package using `-f-contravariant`. Disabling this is an unsupported - configuration, but it may be useful for accelerating builds in sandboxes for - expert users. If disabled we will not supply instances of `Contravariant` - </flag> - <flag name="distributive"> - You can disable the use of the `distributive` - package using `-f-distributive`. Disabling this is an unsupported - configuration, but it may be useful for accelerating builds in sandboxes for - expert users. If disabled we will not supply instances of `Distributive` - </flag> - <flag name="tagged"> - You can disable the use of the `tagged` package - using `-f-tagged`. Disabing this is an unsupported - configuration, but it may be useful for accelerating builds in - sandboxes for expert users. - </flag> - </use> - <upstream> - <remote-id type="github">ekmett/semigroupoids</remote-id> - </upstream> -</pkgmetadata> |