[Haskell-cafe] what exactly does "deriving (Functor, Monad, MonadIO)" do?

[Brandon S. Allbery KF8NH]

On May 1, 2007, at 6:05 , Thomas Hartman wrote:

> Are there are any good examples of code written without this
> extension, alongside code condensed by using this extension. That
> would be helpful for understanding what's going on.

I think all this does is save you from having to write a bunch of  
wrappers that unwrap the contained value, do something to it, and  
rewrap the result.

-- 
brandon s. allbery  [solaris,freebsd,perl,pugs,haskell]   
allbery at kf8nh.com
system administrator  [openafs,heimdal,too many hats]   
allbery at ece.cmu.edu
electrical and computer engineering, carnegie mellon university       
KF8NH