From: Matt Collins <[EMAIL PROTECTED]>
To: "Branimir Maksimovic" <[EMAIL PROTECTED]>
CC: Haskell-Cafe@haskell.org
Subject: Re: [Haskell-cafe] Haskell vs OCaml
Date: Sun, 25 Dec 2005 21:42:35 +1100
Perhaps something like
for :: Int -> Int -> (Int -> IO ()) -> IO ()
for begin end f = sequence_ [ f i | i <- [begin..end] ]
*Main> for 1 10 print
1
2
3
4
5
6
7
8
9
10
Great! what are constrains on [begin..end] could they be some type
which supports (+) , but not Int. I need this cause perhaps there is
possibility to impleemnt STL like algo's in Haskell and that would
be even better then C++, cause Haskell has more powerfull
parametric polimorfism and C++ badly needs lambda's.
That's why STL is somewhat ugly, but lib tried to employ functional
style programming over sequences and is not bad, though in C++
one has to make lot of auxiliary classes because of lack of lambda's.
If I can make Iterator generic class and specialize for different
containers that would be it.
Last question is: Does creation of list of functions humpers performance?
Greetings, Bane.
On 25/12/2005, at 9:35 PM, Branimir Maksimovic wrote:
From: Lennart Augustsson <[EMAIL PROTECTED]>
To: Branimir Maksimovic <[EMAIL PROTECTED]>
CC: [EMAIL PROTECTED], Haskell-Cafe@haskell.org
Subject: Re: [Haskell-cafe] Haskell vs OCaml
Date: Sun, 25 Dec 2005 10:25:44 +0100
Branimir Maksimovic wrote:
I've found that Haskell is pretty good in implementing recursive
algorithms.
Problem cames when one want's to implement non recursive algorithm
by terms of recursion as Haskell does not support loops.
Perhaps if we can get loops, situation will improve, but then that
wouldn't be functional style.
Could you give an example of a loop you find awkward in Haskell?
Well I want simple loop for(int i =0;i<10;++i)doSomething(i);
in haskell that would be
for begin end f | begin /= end = do {f begin ; for (begin+1) end f}
| otherwise = return ()
I've often found that you can just define a control construct
in Haskell when needed (e.g., some kind of loop).
I don't know how to do that.
Greetings, Bane.
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