Re: [Haskell-cafe] polyvariadic function for Applicative instances

2010-05-10 Thread Chris Eidhof
Maybe this is what you are looking for: http://www.haskell.org/haskellwiki/Idiom_brackets -chris On 9 mei 2010, at 18:39, Xiao-Yong Jin wrote: Hi, Is it possible to have a function accept variable number of arguments, such that 'f' can be instantiated to different concrete types as f

Re: [Haskell-cafe] polyvariadic function for Applicative instances

2010-05-10 Thread Xiao-Yong Jin
Thanks, Chris and Bartek. It was quite a read. I finally arrived at an implementation as follows. --8---cut here---start-8--- {-# LANGUAGE MultiParamTypeClasses , FunctionalDependencies , FlexibleInstances ,

[Haskell-cafe] polyvariadic function for Applicative instances

2010-05-09 Thread Xiao-Yong Jin
Hi, Is it possible to have a function accept variable number of arguments, such that 'f' can be instantiated to different concrete types as f :: Applicative a = (e1 - f) - a e1 - A f f g a = pure g * a f :: Applicative a = (e1 - e2 - f) - a e1 - a e2 - A f f g a b = pure g * a * b Thanks,

Re: [Haskell-cafe] polyvariadic function for Applicative instances

2010-05-09 Thread Bartek Ćwikłowski
hello, Is it possible to have a function accept variable number of arguments, such that 'f' can be instantiated to different concrete types as f :: Applicative a = (e1 - f) - a e1 - A f f g a = pure g * a f :: Applicative a = (e1 - e2 - f) - a e1 - a e2 - A f f g a b = pure g * a * b f