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<b_jonas> slashlearn block device/Block devices are a concession made in Unix to make raw hard disks and magnetic tape have a similar interface to regular files and terminals. Since magnetic tapes can\'t write individual bytes, only entire blocks, the interface isn\'t exactly the same, thus the dreaded dd obs= option was born.
author HackBot
date Fri, 17 Jun 2016 08:35:50 +0000
parents 859f9b4339e6
children
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module Uniqs (
	Uniqs(Root, A, B, C)
)
where
	
data Uniqs = A Uniqs | B Uniqs | C Uniqs | Root

instance Eq Uniqs where
	(==) Root Root 		= True
	(==) (A a) (A b) 	= a == b
	(==) (B a) (B b) 	= a == b
	(==) (C a) (C b) 	= a == b
	(==) _ _			= False
	(/=) a b			= not (a == b)

instance Show Uniqs where
	show Root			= "R"
	show (A b)			= 'A':show b
	show (B b)			= 'B':show b
	show (C b)			= 'C':show b