./math/hs-semigroupoids, Semigroupoids: Category sans id

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Branch: CURRENT, Version: 5.3.4, Package name: hs-semigroupoids-5.3.4, Maintainer: pho

Provides a wide array of (semi)groupoids and operations for working with them.

A Semigroupoid is a Category without the requirement of identity arrows
for every object in the category.

A Category is any Semigroupoid for which the Yoneda lemma holds.

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.


Required to run:
[devel/hs-tagged] [devel/hs-hashable] [devel/hs-transformers-compat] [devel/hs-unordered-containers] [math/hs-distributive] [math/hs-semigroups] [devel/hs-base-orphans] [math/hs-contravariant] [math/hs-comonad] [math/hs-bifunctors] [lang/ghc88]

Required to build:
[pkgtools/cwrappers]

Master sites:

SHA1: 18340c81e2895e44ed028fc7e8217ebd60a201f5
RMD160: f21dd91241a6c9b79ae8d82f7c941814f4e25967
Filesize: 25.69 KB

Version history: (Expand)


CVS history: (Expand)


   2020-05-11 19:52:21 by Roland Illig | Files touched by this commit (190) | Package updated
Log message:
hs-*: add PLIST files

These PLIST files have been autogenerated by mk/haskell.mk using
HS_UPDATE_PLIST=yes during a bulk build.  They will help to track changes
to the packages.  The Haskell packages didn't have PLIST files because
their paths contained package hashes.  These hashes are now determined by
mk/haskell.mk, which makes it easy to generate easy to read PLIST files.
   2020-01-03 06:15:10 by Masatake Daimon | Files touched by this commit (4)
Log message:
Import semigroupoids-5.3.4 from wip

Provides a wide array of (semi)groupoids and operations for working with them.

A Semigroupoid is a Category without the requirement of identity arrows
for every object in the category.

A Category is any Semigroupoid for which the Yoneda lemma holds.

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.