traceM and traceShowM
Joachim Breitner
mail at joachim-breitner.de
Sat Oct 17 13:21:49 EDT 2009
Hi,
Am Freitag, den 16.10.2009, 15:22 +0200 schrieb Martijn van Steenbergen:
> I propose the addition of the following two functions to module Debug.Trace:
>
> > traceM :: Monad m => String -> m ()
> > traceM msg = trace msg (return ())
> >
> > traceShowM :: (Show a, Monad m) => a -> m ()
> > traceShowM = traceM . show
thanks to your mail I found out about traceShow. This does save some
time, but I still find myself inserting
(\x -> trace (show x) x)
or now
(\x -> traceShow x x)
into chained functions.
If Debug.Trace, Control.Monad.Instances and Control.Monad happend to be
in scope, this can be abbreviated by
join traceShow :: (Show a) => a -> a
but maybe with a good name, this would be useful in Debug.Trace
directly? I’d really appreciate such a function when debugging code
written in points-free style.
Greetings,
Joachim
--
Joachim "nomeata" Breitner
mail: mail at joachim-breitner.de | ICQ# 74513189 | GPG-Key: 4743206C
JID: nomeata at joachim-breitner.de | http://www.joachim-breitner.de/
Debian Developer: nomeata at debian.org
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