1 files changed, 114 insertions, 0 deletions
diff --git a/src/preference_arrays.adb.old b/src/preference_arrays.adb.old
new file mode 100644
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+++ b/src/preference_arrays.adb.old
@@ -0,0 +1,114 @@
+
+
+with Ada.Unchecked_Deallocation;
+with System.Address_To_Access_Conversions;
+
+
+package body Preference_Arrays is
+
+
+    type Ranking is range 1 .. 255;
+
+    type Preference_Array is array (Positive range <>, Positive range <>) of Ranking;
+    pragma Pack (Preference_Array);
+
+
+
+
+    --  these following functions would be a lot smaller and neater
+    --  if the FFI could make use of fat pointers
+
+
+
+
+    function Create_Preference_Array
+           (Number_Of_Ballots, Size_Of_Ballot : in Interfaces.C.int)
+        return System.Address
+    is
+        subtype Constrained is Preference_Array
+               (1 .. Positive (Number_Of_Ballots),
+                1 .. Positive (Size_Of_Ballot));
+
+        package Convert is new System.Address_To_Access_Conversions
+               (Object => Constrained);
+
+        Pref_Array : Convert.Object_Pointer;
+    begin
+        Pref_Array := new Preference_Array
+               (1 .. Positive (Number_Of_Ballots),
+                1 .. Positive (Size_Of_Ballot));
+        return Convert.To_Address (Pref_Array);
+    end Create_Preference_Array;
+
+
+
+
+    procedure Free_Preference_Array
+           (Number_Of_Ballots, Size_Of_Ballot : in Interfaces.C.int;
+            Pref_Array_Address                : in System.Address)
+    is
+        subtype Constrained is Preference_Array
+               (1 .. Positive (Number_Of_Ballots),
+                1 .. Positive (Size_Of_Ballot));
+
+        package Convert is new System.Address_To_Access_Conversions
+               (Object => Constrained);
+        procedure Free_Pref_Array is new Ada.Unchecked_Deallocation
+               (Object => Constrained, Name => Convert.Object_Pointer);
+
+        Pref_Array : Convert.Object_Pointer;
+    begin
+        Pref_Array := Convert.To_Pointer (Pref_Array_Address);
+        Free_Pref_Array (Pref_Array);
+    end Free_Preference_Array;
+
+
+
+
+    procedure Poke_Preference_Array
+           (Number_Of_Ballots, Size_Of_Ballot : in Interfaces.C.int;
+            Pref_Array_Address                : in System.Address;
+            Ballot_Index, Box_Number, Rank    : in Interfaces.C.int)
+    is
+        subtype Constrained is Preference_Array
+               (1 .. Positive (Number_Of_Ballots),
+                1 .. Positive (Size_Of_Ballot));
+
+        package Convert is new System.Address_To_Access_Conversions
+               (Object => Constrained);
+
+        Pref_Array : Convert.Object_Pointer;
+    begin
+        Pref_Array := Convert.To_Pointer (Pref_Array_Address);
+        Pref_Array (Positive (Ballot_Index), Positive (Box_Number)) := Ranking (Rank);
+    end Poke_Preference_Array;
+
+
+
+
+    function Peek_Preference_Array
+           (Number_Of_Ballots, Size_Of_Ballot : in Interfaces.C.int;
+            Pref_Array_Address                : in System.Address;
+            Ballot_Index, Box_Number, Rank    : in Interfaces.C.int)
+        return Interfaces.C.int
+    is
+        subtype Constrained is Preference_Array
+               (1 .. Positive (Number_Of_Ballots),
+                1 .. Positive (Size_Of_Ballot));
+
+        package Convert is new System.Address_To_Access_Conversions
+               (Object => Constrained);
+
+        Pref_Array : Convert.Object_Pointer;
+    begin
+        Pref_Array := Convert.To_Pointer (Pref_Array_Address);
+        if Pref_Array (Positive (Ballot_Index), Positive (Box_Number)) = Ranking (Rank) then
+            return 1;
+        else
+            return 0;
+        end if;
+    end Peek_Preference_Array;
+
+
+end Preference_Arrays;
+