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Today's Topics:
1. while loop (PICCA Frederic-Emmanuel)
----------------------------------------------------------------------
Message: 1
Date: Thu, 11 Feb 2016 11:02:45 +0000
From: PICCA Frederic-Emmanuel
<frederic-emmanuel.pi...@synchrotron-soleil.fr>
To: "beginners@haskell.org" <beginners@haskell.org>
Subject: [Haskell-beginners] while loop
Message-ID:
<a2a20ec3b8560d408356cac2fc148e53b3036...@sun-dag3.synchrotron-soleil.fr>
Content-Type: text/plain; charset="us-ascii"
Hello,
I am playing with FFI and I need to extract from a C API a list of pointers.
I have two methods available
c_get_first_item :: Ptr List -> IO (Ptr Item)
c_get_next_item :: Ptr List -> Ptr Item -> IO (Ptr Item)
I would like to obtain a [Ptr Item]
I try to used whileM but I did not find how to inject the first item in the
loop.
whileM (return . ( /= nullPtr)) (c_get_next_item list item)
the c_get_next_item return a nullPtr when there is no remaining item.
what is the haskell way in order to extract a list of pointer using these C
methods ?
thanks for your help
Frederic
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