[Haskell-cafe] GHC.Ptr, Foreign.Storable, Data.Storable.Endian, looking for good examples of usage
aaronngray.lists at gmail.com
Mon Jan 10 17:17:48 CET 2011
On 10 January 2011 16:13, Daniel Fischer
<daniel.is.fischer at googlemail.com>wrote:
> On Monday 10 January 2011 16:45:36, Aaron Gray wrote:
> > This is interesting, what does the following line do :-
> > data Int24 = I24# Int# deriving (Eq, Ord)
> > regarding the I24# and Int#, are these inbuilt ?
> Int# is the raw machine int (4 or 8 bytes) and I24# is the constructor. GHC
> uses the magic hash '#' to denote raw unboxed types (and the constructors
> making ordinary boxed Haskell types from these, e.g. there's
> data Int = I# Int#
> data Word = W# Word#
> data Double = D# Double#
> and more defined in base [GHC.Types, GHC.Word]).
So the 24 bit value is actually stored as a 32bit value. Meaning I will have
to do my own IO reader and writer code to a ByteString.
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