libhugs-base-bundled 98.200609.21-5.4+b3 / usr / lib / hugs / packages / base / System / Mem / StableName.hs

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-----------------------------------------------------------------------------
-- |
-- Module      :  System.Mem.StableName
-- Copyright   :  (c) The University of Glasgow 2001
-- License     :  BSD-style (see the file libraries/base/LICENSE)
-- 
-- Maintainer  :  libraries@haskell.org
-- Stability   :  experimental
-- Portability :  non-portable
--
-- Stable names are a way of performing fast (O(1)), not-quite-exact
-- comparison between objects.
-- 
-- Stable names solve the following problem: suppose you want to build
-- a hash table with Haskell objects as keys, but you want to use
-- pointer equality for comparison; maybe because the keys are large
-- and hashing would be slow, or perhaps because the keys are infinite
-- in size.  We can\'t build a hash table using the address of the
-- object as the key, because objects get moved around by the garbage
-- collector, meaning a re-hash would be necessary after every garbage
-- collection.
--
-------------------------------------------------------------------------------

module System.Mem.StableName (
  -- * Stable Names
  StableName,
  makeStableName,
  hashStableName,
  ) where

import Prelude

import Data.Typeable


import Hugs.Stable











































































                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      























































stableNameTc = mkTyCon "StableName"; instance Typeable1 StableName where { typeOf1 _ = mkTyConApp stableNameTc [] }; instance Typeable a => Typeable (StableName a) where { typeOf = typeOfDefault }

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