| ------------------------------------------------------------------------------ |
| -- -- |
| -- GNAT LIBRARY COMPONENTS -- |
| -- -- |
| -- ADA.STRINGS.HASH -- |
| -- -- |
| -- B o d y -- |
| -- -- |
| -- Copyright (C) 2004 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, 59 Temple Place - Suite 330, Boston, -- |
| -- MA 02111-1307, 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.Hash (Key : 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 Key'Range loop |
| Tmp := Rotate_Left (Tmp, 1) + Character'Pos (Key (J)); |
| end loop; |
| |
| return Tmp; |
| end Ada.Strings.Hash; |
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