From 1798c4aeca70ac8d0a243684d6a798fbc65735f8 Mon Sep 17 00:00:00 2001 From: V3n3RiX Date: Sat, 14 Jul 2018 20:57:42 +0100 Subject: gentoo resync : 14.07.2018 --- dev-haskell/semigroupoids/metadata.xml | 74 ---------------------------------- 1 file changed, 74 deletions(-) delete mode 100644 dev-haskell/semigroupoids/metadata.xml (limited to 'dev-haskell/semigroupoids/metadata.xml') 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 @@ - - - - - haskell@gentoo.org - Gentoo Haskell - - - 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. - - - - 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` - - - 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. - - - 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` - - - 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` - - - 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. - - - - ekmett/semigroupoids - - -- cgit v1.2.3