Re: how to convert an array of foreignPtr a into a list of Ptr a

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Re: how to convert an array of foreignPtr a into a list of Ptr a

鲍凯文
Hi Frederic,

I tried writing my thoughts on your question in this gist here: https://gist.github.com/darcykimball/74dd7973b2dbad22b7091135a3b9d472. There's probably much more to it than what I wrote, but I'm figuring that stuff out the more I think about it. I'll try to add more when I'm convinced I get it.

Best,

Kevin

On Tue, Aug 27, 2019 at 5:56 AM <[hidden email]> wrote:
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Today's Topics:

   1.  how to convert an array of foreignPtr a into a   list of Ptr a
      (PICCA Frederic-Emmanuel)


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Date: Tue, 27 Aug 2019 07:19:25 +0000
From: PICCA Frederic-Emmanuel
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Subject: [Haskell-beginners] how to convert an array of foreignPtr a
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Hello, I am writing some code whcih use FFI.

one of my C functions has an array of pointer has imput

extern HklBinocularsCube *hkl_binoculars_cube_new(int32_t n_spaces,
                                                                           const HklBinocularsSpace **spaces);


from Haskell, I have a list of ForeignPtr
so my question how can I have something like withForeignPtr for an array of ForeignPtr

[ForeignPtr a] -> ([Ptr a] -> IO b) -> IO b

Thanks for your help.

Frederic

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Re: how to convert an array of foreignPtr a into a list of Ptr a

PICCA Frederic-Emmanuel
thanks you very much.

it is a very helpfull explaination.

Cheers,

Frederic
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