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Diffstat (limited to 'gnu/packages/datastructures.scm')
| -rw-r--r-- | gnu/packages/datastructures.scm | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/gnu/packages/datastructures.scm b/gnu/packages/datastructures.scm new file mode 100644 index 0000000000..361490000a --- /dev/null +++ b/gnu/packages/datastructures.scm @@ -0,0 +1,49 @@ +;;; GNU Guix --- Functional package management for GNU +;;; Copyright © 2015 Ricardo Wurmus <rekado@elephly.net> +;;; +;;; This file is part of GNU Guix. +;;; +;;; GNU Guix is free software; you can redistribute it and/or modify it +;;; under the terms of the GNU General Public License as published by +;;; the Free Software Foundation; either version 3 of the License, or (at +;;; your option) any later version. +;;; +;;; GNU Guix is distributed in the hope that it will be useful, but +;;; WITHOUT ANY WARRANTY; without even the implied warranty of +;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +;;; GNU General Public License for more details. +;;; +;;; You should have received a copy of the GNU General Public License +;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>. + +(define-module (gnu packages datastructures) + #:use-module (gnu packages) + #:use-module ((guix licenses) #:prefix license:) + #:use-module (guix packages) + #:use-module (guix download) + #:use-module (guix build-system gnu)) + +(define-public sparsehash + (package + (name "sparsehash") + (version "2.0.3") + (source (origin + (method url-fetch) + (uri (string-append "https://github.com/sparsehash/sparsehash/" + "archive/sparsehash-" version ".tar.gz")) + (sha256 + (base32 + "133szz0ldwch0kd91l0sa57qsnl020njn622szd9cxrjqyjqds85")))) + (build-system gnu-build-system) + (synopsis "Memory-efficient hashtable implementations") + (description + "This library contains several hash-map implementations, similar in API +to SGI's @code{hash_map} class, but with different performance +characteristics. @code{sparse_hash_map} uses very little space overhead, 1-2 +bits per entry. @code{dense_hash_map} is very fast, particulary on lookup. +@code{sparse_hash_set} and @code{dense_hash_set} are the set versions of these +routines. All these implementation use a hashtable with internal quadratic +probing. This method is space-efficient -- there is no pointer overhead -- +and time-efficient for good hash functions.") + (home-page "https://github.com/sparsehash/sparsehash") + (license license:bsd-3))) |