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{-# LANGUAGE Trustworthy #-}{-# LANGUAGE NoImplicitPrelude #-}------------------------------------------------------------------------------- |-- Module      :  Foreign.StablePtr-- Copyright   :  (c) The University of Glasgow 2001-- License     :  BSD-style (see the file libraries/base/LICENSE)---- Maintainer  :  ffi@haskell.org-- Stability   :  provisional-- Portability :  portable---- This module is part of the Foreign Function Interface (FFI) and will usually-- be imported via the module "Foreign".-------------------------------------------------------------------------------moduleForeign.StablePtr(-- * Stable references to Haskell valuesStablePtr-- abstract,newStablePtr,deRefStablePtr,freeStablePtr,castStablePtrToPtr,castPtrToStablePtr,-- ** The C-side interface-- $cinterface)whereimportGHC.Stable-- $cinterface---- The following definition is available to C programs inter-operating with-- Haskell code when including the header @HsFFI.h@.---- > typedef void *HsStablePtr;  /* C representation of a StablePtr */---- Note that no assumptions may be made about the values representing stable-- pointers.  In fact, they need not even be valid memory addresses.  The only-- guarantee provided is that if they are passed back to Haskell land, the-- function 'deRefStablePtr' will be able to reconstruct the-- Haskell value referred to by the stable pointer.