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05/15: gnu: Add ghc-psqueues.
From: |
Ludovic Courtès |
Subject: |
05/15: gnu: Add ghc-psqueues. |
Date: |
Fri, 16 Jun 2017 04:33:57 -0400 (EDT) |
civodul pushed a commit to branch master
in repository guix.
commit aba85f8c385e6c4c67bd786fcc253413ff186c1f
Author: rsiddharth <address@hidden>
Date: Thu Jun 15 01:23:50 2017 +0000
gnu: Add ghc-psqueues.
* gnu/packages/haskell.scm (ghc-psqueues): New variable.
Signed-off-by: Ludovic Courtès <address@hidden>
---
gnu/packages/haskell.scm | 65 ++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 65 insertions(+)
diff --git a/gnu/packages/haskell.scm b/gnu/packages/haskell.scm
index 73160e4..26a3d9a 100644
--- a/gnu/packages/haskell.scm
+++ b/gnu/packages/haskell.scm
@@ -8395,4 +8395,69 @@ are the bottleneck of web servers.")
bytestrings and their hexademical representation.")
(license license:bsd-3)))
+(define-public ghc-psqueues
+ (package
+ (name "ghc-psqueues")
+ (version "0.2.2.3")
+ (source
+ (origin
+ (method url-fetch)
+ (uri (string-append "https://hackage.haskell.org/package/"
+ "psqueues-" version "/"
+ "psqueues-" version ".tar.gz"))
+ (sha256
+ (base32
+ "1dd6xv1wjxj1xinx155b14hijw8fafrg4096srzdzj7xyqq7qxbd"))))
+ (build-system haskell-build-system)
+ (inputs
+ `(("ghc-hashable" ,ghc-hashable)))
+ (native-inputs
+ `(("ghc-hunit" ,ghc-hunit)
+ ("ghc-quickcheck" ,ghc-quickcheck)
+ ("ghc-tagged" ,ghc-tagged)
+ ("ghc-test-framework" ,ghc-test-framework)
+ ("ghc-test-framework-hunit" ,ghc-test-framework-hunit)
+ ("ghc-test-framework-quickcheck2" ,ghc-test-framework-quickcheck2)))
+ (home-page "https://github.com/bttr/psqueues")
+ (synopsis "Pure priority search queues")
+ (description "The psqueues package provides
address@hidden://en.wikipedia.org/wiki/Priority_queue, Priority Search Queues}
in
+three different flavors:
+
address@hidden
address@hidden @code{OrdPSQ k p v}, which uses the @code{Ord k} instance to
provide
+fast insertion, deletion and lookup. This implementation is based on Ralf
+Hinze's @uref{http://citeseer.ist.psu.edu/hinze01simple.html, A Simple
+Implementation Technique for Priority Search Queues}.
+
+Hence, it is similar to the @uref{http://hackage.haskell.org/package/PSQueue,
+PSQueue} library, although it is considerably faster and provides a slightly
+different API.
+
address@hidden @code{IntPSQ p v} is a far more efficient implementation. It
fixes the
+key type to @code{Int} and uses a
address@hidden://en.wikipedia.org/wiki/Radix_tree, radix tree}
+(like @code{IntMap}) with an additional min-heap property.
+
address@hidden @code{HashPSQ k p v} is a fairly straightforward extension
+of @code{IntPSQ}: it simply uses the keys' hashes as indices in the
address@hidden If there are any hash collisions, it uses an
address@hidden to resolve those. The performance of this implementation
+is comparable to that of @code{IntPSQ}, but it is more widely
+applicable since the keys are not restricted to @code{Int},
+but rather to any @code{Hashable} datatype.
address@hidden itemize
+
+Each of the three implementations provides the same API, so they can
+be used interchangeably.
+
+Typical applications of Priority Search Queues include:
+
address@hidden
address@hidden Caches, and more specifically LRU Caches;
address@hidden Schedulers;
address@hidden Pathfinding algorithms, such as Dijkstra's and A*.
address@hidden itemize")
+ (license license:bsd-3)))
+
;;; haskell.scm ends here
- 06/15: gnu: Add ghc-glob., (continued)
- 06/15: gnu: Add ghc-glob., Ludovic Courtès, 2017/06/16
- 09/15: gnu: ghc-wai: Update to 3.2.1.1., Ludovic Courtès, 2017/06/16
- 11/15: gnu: Add ghc-warp., Ludovic Courtès, 2017/06/16
- 07/15: gnu: Add ghc-http2., Ludovic Courtès, 2017/06/16
- 10/15: gnu: ghc-wai-extra: Update to 3.0.13.1., Ludovic Courtès, 2017/06/16
- 12/15: gnu: Add ghc-warp-tls., Ludovic Courtès, 2017/06/16
- 13/15: gnu: ghc-http-client: Update to 0.5.6.1., Ludovic Courtès, 2017/06/16
- 14/15: gnu: ghc-http-client-tls: Update to 0.3.4.1., Ludovic Courtès, 2017/06/16
- 04/15: gnu: Add ghc-hex., Ludovic Courtès, 2017/06/16
- 08/15: gnu: ghc-auto-update: Update to 0.1.4., Ludovic Courtès, 2017/06/16
- 05/15: gnu: Add ghc-psqueues.,
Ludovic Courtès <=
- 15/15: gnu: Add ghc-http-conduit., Ludovic Courtès, 2017/06/16