On Monday 09 May 2005 11:45 am, you wrote:
On 07 May 2005 11:59, Dominic Steinitz wrote:
Does anyone know why these are in the IO monad? Aren't they pure functions converting between dotted-decimal strings and a 32-bit network byte ordered binary value?
Dominic.
http://www.haskell.org/ghc/docs/latest/html/libraries/network/Network.So cket.html#v%3Ainet_addr
http://www.haskell.org/ghc/docs/latest/html/libraries/network/Network.So cket.html#v%3Ainet_ntoa
Clearly it should be pure. To avoid breaking the interface, we could add:
showHostAddress :: HostAddress -> String
and deprecate inet_ntoa?
Cheers, Simon I haven't followed the thread on this carefully but as a pragmatic approach, how about:
hostAddress :: HostAddress -> (Word8,Word8,Word8,Word8) inetAddress :: (Word8,Word8,Word8,Word8) -> HostAddress then there shouldn't be any errors to deal with as all the addresses are valid in both representations. And if you want to show the address you can always do: showHostAddress x = concat $ intersperse "." (map show [first x, second x, third x, fourth x]) where first (a,_,_,_) = a second (_,b,_,_) = b third (_,_,c,_) = c fourth (_,_,_,d) = d Dominic.