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+------------------------------------------------------------------------------
+-- --
+-- GNAT LIBRARY COMPONENTS --
+-- --
+-- A D A . C O N T A I N E R S . --
+-- G E N E R I C _ A N O N Y M O U S _ A R R A Y _ S O R T --
+-- --
+-- B o d y --
+-- --
+-- Copyright (C) 2004-2006, 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 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. --
+------------------------------------------------------------------------------
+
+-- This algorithm was adapted from GNAT.Heap_Sort (see g-heasor.ad[sb])
+
+with System;
+
+procedure Ada.Containers.Generic_Anonymous_Array_Sort
+ (First, Last : Index_Type'Base)
+is
+ type T is range System.Min_Int .. System.Max_Int;
+
+ function To_Index (J : T) return Index_Type;
+ pragma Inline (To_Index);
+
+ function Lt (J, K : T) return Boolean;
+ pragma Inline (Lt);
+
+ procedure Xchg (J, K : T);
+ pragma Inline (Xchg);
+
+ procedure Sift (S : T);
+
+ --------------
+ -- To_Index --
+ --------------
+
+ function To_Index (J : T) return Index_Type is
+ K : constant T'Base := Index_Type'Pos (First) + J - T'(1);
+ begin
+ return Index_Type'Val (K);
+ end To_Index;
+
+ --------
+ -- Lt --
+ --------
+
+ function Lt (J, K : T) return Boolean is
+ begin
+ return Less (To_Index (J), To_Index (K));
+ end Lt;
+
+ ----------
+ -- Xchg --
+ ----------
+
+ procedure Xchg (J, K : T) is
+ begin
+ Swap (To_Index (J), To_Index (K));
+ end Xchg;
+
+ Max : T := Index_Type'Pos (Last) - Index_Type'Pos (First) + T'(1);
+
+ ----------
+ -- Sift --
+ ----------
+
+ procedure Sift (S : T) is
+ C : T := S;
+ Son : T;
+ Father : T;
+
+ begin
+ loop
+ Son := C + C;
+
+ if Son < Max then
+ if Lt (Son, Son + 1) then
+ Son := Son + 1;
+ end if;
+ elsif Son > Max then
+ exit;
+ end if;
+
+ Xchg (Son, C);
+ C := Son;
+ end loop;
+
+ while C /= S loop
+ Father := C / 2;
+
+ if Lt (Father, C) then
+ Xchg (Father, C);
+ C := Father;
+ else
+ exit;
+ end if;
+ end loop;
+ end Sift;
+
+-- Start of processing for Generic_Anonymous_Array_Sort
+
+begin
+ for J in reverse 1 .. Max / 2 loop
+ Sift (J);
+ end loop;
+
+ while Max > 1 loop
+ Xchg (1, Max);
+ Max := Max - 1;
+ Sift (1);
+ end loop;
+end Ada.Containers.Generic_Anonymous_Array_Sort;