1 files changed, 47 insertions, 0 deletions
diff --git a/src/Storage.hs b/src/Storage.hs
new file mode 100644
index 0000000..a97a5fc
--- /dev/null
+++ b/src/Storage.hs
@@ -0,0 +1,47 @@
+module Storage(
+    Store,
+
+    createStore,
+    setPref,
+    checkPref
+    ) where
+
+
+
+
+import qualified Control.Monad.Primitive as Prim
+import qualified Data.Vector.Unboxed.Mutable as Vec
+import qualified Data.Int as Ints
+
+
+
+
+data Store = Store { pointer      :: Vec.MVector Prim.RealWorld Ints.Int8
+                   , sizeOfBallot :: Int}
+
+
+
+
+createStore :: Int -> Int -> IO Store
+createStore numberOfEntries ballotSize = do
+    v <- Vec.new (numberOfEntries * ballotSize)
+    return (Store v ballotSize)
+
+
+
+
+setPref :: Store -> Int -> Int -> Int -> IO ()
+setPref prefStore ballot position rank = do
+    let place = (ballot - 1) * (sizeOfBallot prefStore) + (position - 1)
+    Vec.write (pointer prefStore) place (fromIntegral rank)
+
+
+
+
+checkPref :: Store -> Int -> Int -> Int -> IO Bool
+checkPref prefStore ballot position rank = do
+    let place = (ballot - 1) * (sizeOfBallot prefStore) + (position - 1)
+    value <- Vec.read (pointer prefStore) place
+    return (value == (fromIntegral rank))
+
+