;; Nujel - Copyright (C) 2020-2021 - Benjamin Vincent Schulenburg
;; This project uses the MIT license, a copy should be included under /LICENSE
;;
;; Some functions manipulating binary date
[defn lognand l
"Returns the Nand of its arguments"
[lognot [apply logand l]]]
[defn bit-set? [α i]
"Returns #t if bit I is set in Α"
[typecheck/only α :int]
[typecheck/only i :int]
[not [zero? [logand α [ash 1 i]]]]]
[defn bit-set?! [i]
"Returns a function that checks if bit I is set in the provided number"
[typecheck/only i :int]
[def mask [ash 1 i]]
[fn [α]
[not [zero? [logand α mask]]]]]
[defn bit-clear?! [i]
"Returns a function that checks if bit I is clear in the provided number"
[typecheck/only i :int]
[def mask [ash 1 i]]
[fn [α]
[zero? [logand α mask]]]]
