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| -rw-r--r-- | 2d/helpers.scm | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/2d/helpers.scm b/2d/helpers.scm new file mode 100644 index 0000000..a8bf0cf --- /dev/null +++ b/2d/helpers.scm @@ -0,0 +1,37 @@ +;;; guile-2d +;;; Copyright (C) 2013 David Thompson <dthompson2@worcester.edu> +;;; +;;; Guile-2d is free software: you can redistribute it and/or modify it +;;; under the terms of the GNU Lesser General Public License as +;;; published by the Free Software Foundation, either version 3 of the +;;; License, or (at your option) any later version. +;;; +;;; Guile-2d 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 +;;; Lesser General Public License for more details. +;;; +;;; You should have received a copy of the GNU Lesser General Public +;;; License along with this program. If not, see +;;; <http://www.gnu.org/licenses/>. + +;;; Commentary: +;; +;; Miscellaneous helper procedures. +;; +;;; Code: + +(define-module (2d helpers) + #:use-module (srfi srfi-1) + #:export (any-equal? + logand?)) + +(define (any-equal? elem . args) + "Returns true if elem equals any of the arguments and returns false +otherwise." + (any (lambda (e) (= elem e)) args)) + +(define (logand? . args) + "Returns true if the result of a bitwise AND of the integer +arguments is non-zero and returns false otherwise." + (not (zero? (apply logand args)))) |