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Diffstat (limited to 'cdbc.lisp')
| -rw-r--r-- | cdbc.lisp | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/cdbc.lisp b/cdbc.lisp new file mode 100644 index 0000000..9d790ab --- /dev/null +++ b/cdbc.lisp @@ -0,0 +1,10 @@ +;; Ported from https://rosettacode.org/wiki/Assertions_in_design_by_contract#Eiffel +;; Arguably not *quite* design-by-contract, but very close in vanilla CL +(defun average-of-absolutes (values) + (declare (list values)) + (assert (> (length values) 0)) + (let ((res (/ (reduce #'+ (mapcar #'abs values)) (length values)))) + (assert (>= res 0)) + (the fixnum res))) +;; (average-of-absolutes '(1 3)) +;; (average-of-absolutes '()) |