Re: [Haskell-beginners] About ! before a type signature

I’m just curious, but is there any practical guide or tutorial on this topic? I found it relatively hard to reason about the time complexity of Haskell programs. — Xiaojun "Phil (http://cnphil.com/)" Hu On Friday, 6 June, 2014 at 21:05, Bob Ippolito wrote:

That declares those fields to be strict. See also http://www.haskell.org/haskellwiki/Performance/Data_types

On Friday, June 6, 2014, Song Zhang wrote:

...

This is about syntax of Haskell. I am reading the source code of Yampa. I find that a definition like the following

data SF' a b where SFArr :: !(DTime -> a -> Transition a b) -> !(FunDesc a b) -> SF' a b

in Yampa.hs.

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