-- --
-- GNAT LIBRARY COMPONENTS --
-- --
--- ADA.CONTAINERS.PRIME_NUMBERS --
+-- A D A . C O N T A I N E R S . P R I M E _ N U M B E R S --
-- --
-- S p e c --
-- --
--- This specification is adapted from the Ada Reference Manual for use with --
--- GNAT. In accordance with the copyright of that document, you can freely --
--- copy and modify this specification, provided that if you redistribute a --
--- modified version, any changes that you have made are clearly indicated. --
+-- Copyright (C) 2004-2009, Free Software Foundation, Inc. --
-- --
+-- 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 3, 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. --
+-- --
+-- As a special exception under Section 7 of GPL version 3, you are granted --
+-- additional permissions described in the GCC Runtime Library Exception, --
+-- version 3.1, as published by the Free Software Foundation. --
+-- --
+-- You should have received a copy of the GNU General Public License and --
+-- a copy of the GCC Runtime Library Exception along with this program; --
+-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
+-- <http://www.gnu.org/licenses/>. --
+-- --
+-- This unit was originally developed by Matthew J Heaney. --
------------------------------------------------------------------------------
+-- This package declares the prime numbers array used to implement hashed
+-- containers. Bucket arrays are always allocated with a prime-number
+-- length (computed using To_Prime below), as this produces better scatter
+-- when hash values are folded.
+
package Ada.Containers.Prime_Numbers is
-pragma Pure (Prime_Numbers);
+ pragma Pure;
type Primes_Type is array (Positive range <>) of Hash_Type;
1610612741, 3221225473, 4294967291);
function To_Prime (Length : Count_Type) return Hash_Type;
+ -- Returns the smallest value in Primes not less than Length
end Ada.Containers.Prime_Numbers;
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