1 ------------------------------------------------------------------------------
3 -- GNAT LIBRARY COMPONENTS --
5 -- A D A . S T R I N G S . W I D E _ H A S H --
9 -- Copyright (C) 2004-2005 Free Software Foundation, Inc. --
11 -- This specification is derived from the Ada Reference Manual for use with --
12 -- GNAT. The copyright notice above, and the license provisions that follow --
13 -- apply solely to the contents of the part following the private keyword. --
15 -- GNAT is free software; you can redistribute it and/or modify it under --
16 -- terms of the GNU General Public License as published by the Free Soft- --
17 -- ware Foundation; either version 2, or (at your option) any later ver- --
18 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
19 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
20 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
21 -- for more details. You should have received a copy of the GNU General --
22 -- Public License distributed with GNAT; see file COPYING. If not, write --
23 -- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
24 -- Boston, MA 02110-1301, USA. --
26 -- As a special exception, if other files instantiate generics from this --
27 -- unit, or you link this unit with other files to produce an executable, --
28 -- this unit does not by itself cause the resulting executable to be --
29 -- covered by the GNU General Public License. This exception does not --
30 -- however invalidate any other reasons why the executable file might be --
31 -- covered by the GNU Public License. --
33 -- This unit was originally developed by Matthew J Heaney. --
34 ------------------------------------------------------------------------------
36 -- Note: source of this algorithm: GNAT.HTable.Hash (g-htable.adb)
38 function Ada
.Strings
.Wide_Hash
39 (Key
: Wide_String) return Containers
.Hash_Type
45 Amount
: Natural) return Hash_Type
;
46 pragma Import
(Intrinsic
, Rotate_Left
);
52 for J
in Key
'Range loop
53 Tmp
:= Rotate_Left
(Tmp
, 3) + Wide_Character'Pos (Key
(J
));
57 end Ada
.Strings
.Wide_Hash
;