From 958d64d77572c47d249965d7146ac17a23de806d Mon Sep 17 00:00:00 2001
From: Simon Hengel <sol@typeful.net>
Date: Mon, 15 Oct 2012 10:34:28 +0200
Subject: Move HTML tests to directory /html-test/

---
 html-test/tests/Hash.hs | 51 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 51 insertions(+)
 create mode 100644 html-test/tests/Hash.hs

(limited to 'html-test/tests/Hash.hs')

diff --git a/html-test/tests/Hash.hs b/html-test/tests/Hash.hs
new file mode 100644
index 00000000..343b69e9
--- /dev/null
+++ b/html-test/tests/Hash.hs
@@ -0,0 +1,51 @@
+{- |
+  Implementation of fixed-size hash tables, with a type 
+  class for constructing hash values for structured types.
+-}
+module Hash (
+  -- * The @HashTable@ type
+  HashTable,
+
+  -- ** Operations on @HashTable@s
+  new, insert, lookup,
+
+  -- * The @Hash@ class
+  Hash(..),
+ ) where
+
+import Data.Array
+import Prelude hiding (lookup)
+
+-- | A hash table with keys of type @key@ and values of type @val@.
+-- The type @key@ should be an instance of 'Eq'.
+data HashTable key val = HashTable Int (Array Int [(key,val)])
+
+-- | Builds a new hash table with a given size
+new :: (Eq key, Hash key) => Int -> IO (HashTable key val)
+new = undefined
+
+-- | Inserts a new element into the hash table
+insert :: (Eq key, Hash key) => key -> val -> IO ()
+insert = undefined
+
+-- | Looks up a key in the hash table, returns @'Just' val@ if the key
+-- was found, or 'Nothing' otherwise.
+lookup 	:: Hash key => key -> IO (Maybe val)
+lookup = undefined
+
+-- | A class of types which can be hashed.
+class Hash a where
+   -- | hashes the value of type @a@ into an 'Int'
+   hash :: a -> Int
+
+instance Hash Int where
+   hash = id
+
+instance Hash Float where
+   hash = trunc
+
+instance (Hash a, Hash b) => Hash (a,b) where
+   hash (a,b) = hash a `xor` hash b
+
+trunc = undefined
+xor = undefined
-- 
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