Re: [Haskell-cafe] Global Arrays

What's the advantage of using D.A.Storable over D.Vector? And yes, good call with creating an array of HSDouble directly. I didn't think of that! On Fri, Mar 9, 2012 at 8:25 PM, John Meacham wrote:

On Fri, Mar 9, 2012 at 12:48 PM, Clark Gaebel wrote:

...

static const double globalArray[] = { huge list of doubles }; double* getGlobalArray() { return globalArray; } int        getGlobalArraySize() { return sizeof(globalArray)/sizeof(globalArray[0]); }

And importing it in haskell witht he FFI, followed with an unsafeCast:

foreign import ccall unsafe "getGlobalArray" c_globalArray :: Ptr CDouble foreign import ccall unsafe "getGlobalArraySize" c_globalArraySize :: CInt

You can use Data.Array.Storable to do this. http://hackage.haskell.org/packages/archive/array/0.3.0.3/doc/html/Data-Arra...

Also, there is no need to create stub C functions, you can foreign import the array directly And if you don't want to cast between CDouble and Double you can declare your array to be of HsDouble and #include "HsFFI.h"

const HsDouble globalArray[] = { huge list of doubles }; foreign import ccall unsafe "&globalArray" :: Ptr Double

   John