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+------------------------------------------------------------------------------
+-- --
+-- GNAT RUN-TIME COMPONENTS --
+-- --
+-- G N A T . B U B B L E _ S O R T --
+-- --
+-- S p e c --
+-- --
+-- Copyright (C) 1995-2010, AdaCore --
+-- --
+-- 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/>. --
+-- --
+-- GNAT was originally developed by the GNAT team at New York University. --
+-- Extensive contributions were provided by Ada Core Technologies Inc. --
+-- --
+------------------------------------------------------------------------------
+
+-- Sort Utility (Using Bubblesort Algorithm)
+
+-- This package provides a bubblesort routine that works with access to
+-- subprogram parameters, so that it can be used with different types with
+-- shared sorting code.
+
+-- See also GNAT.Bubble_Sort_G and GNAT.Bubble_Sort_A. These are older
+-- versions of this routine. In some cases GNAT.Bubble_Sort_G may be a
+-- little faster than GNAT.Bubble_Sort, at the expense of generic code
+-- duplication and a less convenient interface. The generic version also
+-- has the advantage of being Pure, while this unit can only be Preelaborate.
+
+package GNAT.Bubble_Sort is
+ pragma Pure;
+
+ -- The data to be sorted is assumed to be indexed by integer values from
+ -- 1 to N, where N is the number of items to be sorted.
+
+ type Xchg_Procedure is access procedure (Op1, Op2 : Natural);
+ -- A pointer to a procedure that exchanges the two data items whose
+ -- index values are Op1 and Op2.
+
+ type Lt_Function is access function (Op1, Op2 : Natural) return Boolean;
+ -- A pointer to a function that compares two items and returns True if
+ -- the item with index value Op1 is less than the item with Index value
+ -- Op2, and False if the Op1 item is greater than or equal to the Op2
+ -- item.
+
+ procedure Sort (N : Natural; Xchg : Xchg_Procedure; Lt : Lt_Function);
+ -- This procedures sorts items in the range from 1 to N into ascending
+ -- order making calls to Lt to do required comparisons, and calls to
+ -- Xchg to exchange items. The sort is stable, that is the order of
+ -- equal items in the input is preserved.
+
+end GNAT.Bubble_Sort;