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

[Brandon S. Allbery KF8NH]

On 2008 Aug 30, at 6:28, Adrian Hey wrote:
> Ganesh Sittampalam wrote:
>> How do the implementers of Data.Unique know that they musn't let  
>> them be serialised/deserialised?
>
> Because if you could take a String and convert it to a Unique there
> would be no guarantee that result was *unique*.
>
>> What stops the same rule from applying to Data.Random?
>
> Well the only data type defined by this is StdGen, which is a Read/ 
> Show
> instance. I guess there's no semantic problem with that (can't think  
> of
> one off hand myself).

You *want* to be able to reproduce a given random seed, for  
simulations and the like.

-- 
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