Ok, got ! and WHNF. Thanks,
Michael --- On Sat, 7/31/10, Ivan Lazar Miljenovic <ivan.miljeno...@gmail.com> wrote: From: Ivan Lazar Miljenovic <ivan.miljeno...@gmail.com> Subject: Re: [Haskell-cafe] Constructor question To: "michael rice" <nowg...@yahoo.com> Cc: haskell-cafe@haskell.org Date: Saturday, July 31, 2010, 9:32 AM michael rice <nowg...@yahoo.com> writes: > From: Data.Complex > > data (RealFloat a) => Complex a > = !a :+ !a > > What's the purpose of the exclamation marks? Forcing; it means that the values are evaluated (up to WHNF) before the Complex value is constructed: http://www.haskell.org/ghc/docs/6.12.1/html/users_guide/bang-patterns.html -- Ivan Lazar Miljenovic ivan.miljeno...@gmail.com IvanMiljenovic.wordpress.com
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