Re: different flavours of Monad Transformer Library (fwd)

Hello, While people are discussing different monad libraries---there is also monadLib that I and some of my colleagues use. It is fairly small and it works pretty well, I think. -Iavor On Wed, Jan 7, 2009 at 12:28 PM, Antoine Latter wrote:

On Wed, Jan 7, 2009 at 11:23 AM, Mauro J. Jaskelioff wrote:

...

Hi, sorry for the late reply,

I also like Ross' idea of monads being synonyms for transformers at Id. It removes lots of repeated code.

There's a cost to that technique.

Parsec3 introduced parsec as a monad transformer, and the parsec base monad is implemented as the transformer wrapped around the identity monad.

There's a significant speed regression to doing so - I have a branch of Parsec3 which re-introduces a proper base monad and shares (some) code via typeclasses. This puts us back at Parsec2 numbers.

I don't have any hard data on hand at the moment, it's been a while.

-Antoine _______________________________________________ Libraries mailing list Libraries@haskell.org http://www.haskell.org/mailman/listinfo/libraries