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+------------------------------------------------------------------------------
+-- --
+-- GNAT LIBRARY COMPONENTS --
+-- --
+-- A D A . S T R I N G S . W I D E _ U N B O U N D E D . W I D E _ H A S H --
+-- --
+-- B o d y --
+-- --
+-- Copyright (C) 2004-2005, Free Software Foundation, Inc. --
+-- --
+-- This specification is derived from the Ada Reference Manual for use with --
+-- GNAT. The copyright notice above, and the license provisions that follow --
+-- apply solely to the contents of the part following the private keyword. --
+-- --
+-- GNAT is free software; you can redistribute it and/or modify it under --
+-- terms of the GNU General Public License as published by the Free Soft- --
+-- ware Foundation; either version 2, or (at your option) any later ver- --
+-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
+-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
+-- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
+-- for more details. You should have received a copy of the GNU General --
+-- Public License distributed with GNAT; see file COPYING. If not, write --
+-- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
+-- Boston, MA 02110-1301, USA. --
+-- --
+-- As a special exception, if other files instantiate generics from this --
+-- unit, or you link this unit with other files to produce an executable, --
+-- this unit does not by itself cause the resulting executable to be --
+-- covered by the GNU General Public License. This exception does not --
+-- however invalidate any other reasons why the executable file might be --
+-- covered by the GNU Public License. --
+-- --
+-- This unit was originally developed by Matthew J Heaney. --
+------------------------------------------------------------------------------
+
+-- Note: source of this algorithm: GNAT.HTable.Hash (g-htable.adb)
+
+function Ada.Strings.Wide_Wide_Unbounded.Wide_Wide_Hash
+ (Key : Unbounded_Wide_Wide_String) return Containers.Hash_Type
+is
+ use Ada.Containers;
+
+ function Rotate_Left
+ (Value : Hash_Type;
+ Amount : Natural) return Hash_Type;
+ pragma Import (Intrinsic, Rotate_Left);
+
+ Tmp : Hash_Type;
+
+begin
+ Tmp := 0;
+ for J in 1 .. Key.Last loop
+ Tmp := Rotate_Left (Tmp, 3) +
+ Wide_Wide_Character'Pos (Key.Reference (J));
+ end loop;
+
+ return Tmp;
+end Ada.Strings.Wide_Wide_Unbounded.Wide_Wide_Hash;