RE: #ifdef considered harmful (was: DData)

16 Apr 2004


      
...
"Simon Marlow"  writes:
...
Most of the time it's unnecessary to use an explicit Int#.  
If your Int
is in a data structure, you can use
{-# UNPACK #-} !Int
which is portable, and compiles to an unboxed Int in GHC >= 6.2.
Is this different from 
        !Int
and 
        -funbox-strict
?
(I.e., should I change from this to UNPACK pragmas?)
They both have the same effect, but I prefer to put these hints in the
source code which is why I prefer to use {-# UNPACK #-} rather than the
command-line flag.  Also, sometimes it is necessary to have fine-grained
control over which fields are unpacked.

Cheers,
	Simon