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New mallocForeignPtrBytesWithAlignedPtr function #83

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Sep 30, 2019
Merged

New mallocForeignPtrBytesWithAlignedPtr function #83

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1 change: 1 addition & 0 deletions hw-prim.cabal
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Original file line number Diff line number Diff line change
Expand Up @@ -106,6 +106,7 @@ library
HaskellWorks.Data.Vector.Storable
HaskellWorks.Data.Vector.StorableVectorLike
HaskellWorks.Data.Word
HaskellWorks.Foreign
other-modules: Paths_hw_prim
autogen-modules: Paths_hw_prim
hs-source-dirs: src
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16 changes: 16 additions & 0 deletions src/HaskellWorks/Foreign.hs
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@@ -0,0 +1,16 @@
module HaskellWorks.Foreign
( mallocForeignPtrBytesWithAlignedPtr
) where

import Foreign.ForeignPtr (ForeignPtr)
import Foreign.Ptr (Ptr, alignPtr)
import Foreign.Storable (Storable)

import qualified Foreign.ForeignPtr as F
import qualified Foreign.ForeignPtr.Unsafe as F

mallocForeignPtrBytesWithAlignedPtr :: Storable a => Int -> Int -> IO (ForeignPtr a, Ptr a)
mallocForeignPtrBytesWithAlignedPtr alignment n = do
fptr <- F.mallocForeignPtrBytes (n + alignment)
let alignedPtr = alignPtr (F.unsafeForeignPtrToPtr fptr) alignment
return (fptr, alignedPtr)