1 files changed, 33 insertions, 0 deletions
diff --git a/sort/shell.adb b/sort/shell.adb
new file mode 100644
index 0000000..6e9cc22
--- /dev/null
+++ b/sort/shell.adb
@@ -0,0 +1,33 @@
+
+
+package body Shell is
+
+
+    -- sequence from Marcin Ciura, 2001
+    Gaps : array (Positive range 1 .. 8) of Integer := (701, 301, 132, 57, 23, 10, 4, 1);
+
+
+    procedure Sort(Arr : in out Array_T) is
+        Temp : Element_T;
+        Place : Integer;
+    begin
+        if Arr'Length <= 1 then
+            return;
+        end if;
+
+        for G of Gaps loop
+            for I in Integer range (Index_T'Pos(Arr'First) + G) .. Index_T'Pos(Arr'Last) loop
+                Place := I;
+                Temp := Arr(Index_T'Val(Place));
+                while Place >= (Index_T'Pos(Arr'First) + G) and then Arr(Index_T'Val(Place - G)) > Temp loop
+                    Arr(Index_T'Val(Place)) := Arr(Index_T'Val(Place - G));
+                    Place := Place - G;
+                end loop;
+                Arr(Index_T'Val(Place)) := Temp;
+            end loop;
+        end loop;
+    end Sort;
+
+
+end Shell;
+