Re: [Haskell-cafe] How do you make constant expressions?

On Sunday 18 July 2010 23:07:38, Eitan Goldshtrom wrote:

So just so I get this straight, the following are equivalent to the computer, after compiling:

1. fact = 10 {-# INLINE fact #-}

func x = x * fact

2. func x = x * 10

I'm not sure if they're equivalent when compiled without optimisations, but with optimisations, they ought to. Actually, with optimisations, the inline-pragma shouldn't even be necessary.

I'm also curious as to what the {-# #-} brackets represent. I've never seen those before.

They mark pragmas, there are a lot of useful pragmas in GHC, take a look at the user's guide, section 7.

-Eitan