Re: [Haskell-beginners] Map on Nested Lists

On 8 Apr 2010, at 16:34, Stephen Tetley wrote:

On 8 April 2010 14:37, Thomas Davie wrote:

...

You can't write a single such function to operate on all the different types, .... [SNIP]

Hi Bob (?)

I believe Oleg Kiselyov's deepset functor manages it...

http://okmij.org/ftp/Haskell/typecast.html http://okmij.org/ftp/Haskell/deepest-functor.lhs

PS - is it Bob or Thomas? thanks.

Well corrected, and either. Ta Bob