Re: Haskell Platform proposal: Add the vector package

On Mon, Jun 18, 2012 at 4:09 PM, Roman Leshchinskiy wrote:

ForeignPtrs can be unpacked, just not manually (which is a GHC bug, IMO, I should report it):

data Vector a = Vector {-# UNPACK #-} !Int                       {-# UNPACK #-} !(ForeignPtr a)

ByteString just has some room for optimisation here ;-)

I probably just remembered the ByteString optimization incorrectly. My apologies. I think the Addr# field was moved to the top of ForeignPtr (not to the PS constructor itself) to support unpacking. -- Johan