[Haskell-cafe] Main function variables made global.

mantkiew at gsd.uwaterloo.ca mantkiew at gsd.uwaterloo.ca
Thu Mar 27 11:39:37 UTC 2014

Anthony, maybe simply add var as a parameter and partially apply func in main? That'll give you the right type.


  Original Message  
From: Tom Ellis
Sent: Thursday, March 27, 2014 7:06 AM
To: haskell-cafe at haskell.org
Subject: Re: [Haskell-cafe] Main function variables made global.

On Thu, Mar 27, 2014 at 10:58:45AM +0000, Chapman, Anthony Sergio wrote:
> func w = w * var
> I get the value of 'var' from a text file in the main function (as the
> user types the name of the file into terminal)
> I need a way for 'func' to see what 'var' is without having to change
> it's type (ie make it into a function which take a 'w' and a 'var'.
> The reason I can't change the type is that I then pass the function to a
> PSO module which has strict declarations of a function and I would rather
> not change the PSO module.

It's not quite clear to me what you're asking, but won't something like this

do var <- readVar
let func w = w * var
let result = psoFunction func

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