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+------------------------------------------------------------------------------
+--                                                                          --
+--                         GNAT LIBRARY COMPONENTS                          --
+--                                                                          --
+--         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          --
+--                                                                          --
+--                                 B o d y                                  --
+--                                                                          --
+--          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.                  --
+------------------------------------------------------------------------------
+
+package body Ada.Containers.Prime_Numbers is
+
+   --------------
+   -- To_Prime --
+   --------------
+
+   function To_Prime (Length : Count_Type) return Hash_Type is
+      I, J, K : Integer'Base;
+      Index   : Integer'Base;
+
+   begin
+      I := Primes'Last - Primes'First;
+      Index := Primes'First;
+      while I > 0 loop
+         J := I / 2;
+         K := Index + J;
+
+         if Primes (K) < Hash_Type (Length) then
+            Index := K + 1;
+            I := I - J - 1;
+         else
+            I := J;
+         end if;
+      end loop;
+
+      return Primes (Index);
+   end To_Prime;
+
+end Ada.Containers.Prime_Numbers;