From 31bf84122b21efb444aa8d055472e166ffb90783 Mon Sep 17 00:00:00 2001 From: aarne Date: Tue, 20 May 2008 11:47:44 +0000 Subject: moved all old source code to src-2.9 ; src will be for GF 3 development --- src-2.9/GF/Data/SharedString.hs | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) create mode 100644 src-2.9/GF/Data/SharedString.hs (limited to 'src-2.9/GF/Data/SharedString.hs') diff --git a/src-2.9/GF/Data/SharedString.hs b/src-2.9/GF/Data/SharedString.hs new file mode 100644 index 000000000..9d037b512 --- /dev/null +++ b/src-2.9/GF/Data/SharedString.hs @@ -0,0 +1,19 @@ + +module GF.Data.SharedString (shareString) where + +import Data.HashTable as H +import System.IO.Unsafe (unsafePerformIO) + +{-# NOINLINE stringPool #-} +stringPool :: HashTable String String +stringPool = unsafePerformIO $ new (==) hashString + +{-# NOINLINE shareString #-} +shareString :: String -> String +shareString s = unsafePerformIO $ do + mv <- H.lookup stringPool s + case mv of + Just s' -> return s' + Nothing -> do + H.insert stringPool s s + return s -- cgit v1.2.3