Here are some even older discussions on the subject. I don't know if anyone
ever put them into a library or on the wiki.
Dominic.
http://haskell.org/pipermail/haskell-cafe/2005-May/009784.html
http://www.haskell.org//pipermail/libraries/2005-February/003143.html
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Hello Maurício,
Friday, February 03, 2006, 7:28:16 PM, you wrote:
M>I wonder if I could write a generic while based on your example:
while :: (a ->> IO a) -> (a -> Bool) -> IO ()
M>I'll probably learn something trying that.
i have about 5-10 imperative control structures defined in my
On Feb 3, 2006, at 11:28 AM, Maurício wrote:
Kurt Hutchinson wrote:
On 2/2/06, Maurício <[EMAIL PROTECTED]> wrote:
I understand those examples, but I really would like to know
how to
do that with monads. I would like to ask the same question, but
now with
this code:
double a = 1000;
dou
Kurt Hutchinson wrote:
On 2/2/06, Maurício <[EMAIL PROTECTED]> wrote:
I understand those examples, but I really would like to know how to
do that with monads. I would like to ask the same question, but now with
this code:
double a = 1000;
double b = 0;
while (a != b) {
a /= 2;
cout <
On 2/2/06, Maurício <[EMAIL PROTECTED]> wrote:
>I understand those examples, but I really would like to know how to
> do that with monads. I would like to ask the same question, but now with
> this code:
>
> double a = 1000;
> double b = 0;
> while (a != b) {
> a /= 2;
> cout << a; //
Maurício wrote:
> I understand those examples, but I really would like to know how to do
> that with monads. I would like to ask the same question, but now with
> this code:
>
> double a = 1000;
> double b = 0;
> while (a != b) {
> a /= 2;
> cout << a; // Prints a
> cin << b; // Use
I think you're looking for IORef http://www.haskell.org/ghc/docs/
latest/html/libraries/base/Data-IORef.html
Something like this (untested) should do what you want:
example :: IO ()
example = do { ref <- newIORef 1000; loop ref }
where loop ref = do
x <- readIORef ref
print x
Donald Bruce Stewart wrote:
briqueabraque:
Hi,
I would like to know what options I have in Haskell to do something
similar to this C++ code:
double a = 1000;
while (a>1) a/=2;
I'm able to do that with lists, but I would like to know how to do
that with monads and variables with state.
