fixed-length vectors?
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
import qualified Data.Vector.Unboxed as V | |
import Data.Bits(setBit) | |
import Data.Word(Word8) | |
main :: IO () | |
main = do | |
assertEqual 0x8c $ byte (bitsLE "0011" V.++ bitsLE "0001") | |
putStrLn "passed" | |
-- Create a bit-vector from a little-endian string of 1's and 0's | |
bitsLE :: String -> V.Vector Bool | |
bitsLE = V.map (/= '0') . V.fromList | |
-- Convert to Word8. Bits past first 8 silently ignored. | |
byte :: V.Vector Bool -> Word8 | |
byte = V.ifoldl' setWhen 0 | |
where | |
setWhen acc _ False = acc | |
setWhen acc i True = setBit acc i | |
assertEqual :: (Eq a, Show a) => a -> a -> IO () | |
assertEqual actual expected | |
| actual == expected = return () | |
| otherwise = error $ "assertion failed\n" | |
++ " expected: " ++ show expected ++ "\n" | |
++ " but got: " ++ show actual |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment