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Message from discussion How to use parameters in "IO(int, int)"
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一千瓦的刀狼  
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 More options May 26 2008, 9:14 am
Newsgroups: comp.lang.haskell
From: 一千瓦的刀狼 <knifew...@gmail.com>
Date: Mon, 26 May 2008 06:14:47 -0700 (PDT)
Local: Mon, May 26 2008 9:14 am
Subject: Re: How to use parameters in "IO(int, int)"
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On 5月25日, 下午6时04分, Dirk Thierbach <dthierb...@usenet.arcornews.de>
wrote:

> ?????? <knifew...@gmail.com> wrote:
> >  I have got such a function like "Object => o -> IO(int, int)" from
> > existing API, and actually I needed is the parameters of "IO(int,
> > int)". How can I get these 2 parameters? just use a sentence like "x
> > <- fst(IO(int, int))"? Is it works?

> No, that doesn't work: Read up on Monads. Tutorials have just been
> mentioned in a different thread.

> > Or somebody will have a good idea to help me?

> Try something like

> > foo o = do
> >   (x1,x2) <- yourFunction o
> >   -- now do something with x1 and x2, eg add them:
> >   return (x1+x2)

> But if you don't understand how to use the IO-Monad, you'll probably
> quickly get stuck again.

> - Dirk

Thank you very much! I will read the tutorial first

 
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