[Haskell-cafe] Re: [Haskell] Top Level <-

Johannes Waldmann waldmann at imn.htwk-leipzig.de
Thu Aug 28 05:30:34 EDT 2008

Adrian Hey wrote:

> There are plenty situations where it makes no semantic sense to allow
> 2 or more or some "thing". A list of all active processes for example.

"all" referring to what scope? perhaps there occurs a situation
with several process (thread) pools, severals cores etc.

See also "singleton considered harmful", there are similar arguments:

and also Section 13.3 "Global Data"
in McConnell: Code Complete (2nd ed.) has a nice discussion.


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