diff options
| -rw-r--r-- | Makefile.am | 1 | ||||
| -rw-r--r-- | chickadee/utils.scm | 33 |
2 files changed, 34 insertions, 0 deletions
diff --git a/Makefile.am b/Makefile.am index b29464b..7838b0b 100644 --- a/Makefile.am +++ b/Makefile.am @@ -40,6 +40,7 @@ godir=$(libdir)/guile/$(GUILE_EFFECTIVE_VERSION)/ccache SOURCES = \ chickadee/config.scm \ + chickadee/utils.scm \ chickadee/input/controller.scm \ chickadee/math.scm \ chickadee/math/vector.scm \ diff --git a/chickadee/utils.scm b/chickadee/utils.scm new file mode 100644 index 0000000..4f989ac --- /dev/null +++ b/chickadee/utils.scm @@ -0,0 +1,33 @@ +;;; Chickadee Game Toolkit +;;; Copyright (C) 2014 Ludovic Courtès <ludo@gnu.org> +;;; Copyright © 2016 David Thompson <davet@gnu.org> +;;; +;;; Chickadee 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. +;;; +;;; Chickadee 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 this program. If not, see +;;; <http://www.gnu.org/licenses/>. + +(define-module (chickadee utils) + #:export (memoize)) + +;; Written by Ludovic Courtès. Taken from GNU Guix. +(define (memoize proc) + "Return a memoizing version of PROC." + (let ((cache (make-hash-table))) + (lambda args + (let ((results (hash-ref cache args))) + (if results + (apply values results) + (let ((results (call-with-values (lambda () (apply proc args)) + list))) + (hash-set! cache args results) + (apply values results))))))) |