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+------------------------------------------------------------------------------
+-- --
+-- GNAT RUN-TIME COMPONENTS --
+-- --
+-- G N A T . B U B B L E _ S O R T _ G --
+-- --
+-- 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. --
+-- --
+------------------------------------------------------------------------------
+
+-- Bubblesort generic package using formal procedures
+
+-- This package provides a generic bubble sort routine that can be used with
+-- different types of data.
+
+-- See also GNAT.Bubble_Sort, a version that works with subprogram access
+-- parameters, allowing code sharing. The generic version is slightly more
+-- efficient but does not allow code sharing and has an interface that is
+-- more awkward to use.
+
+-- There is also GNAT.Bubble_Sort_A, which is now considered obsolete, but
+-- was an older version working with subprogram parameters. This version
+-- is retained for backwards compatibility with old versions of GNAT.
+
+generic
+ -- 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. In addition, the
+ -- index value zero is used for a temporary location used during the sort.
+
+ with procedure Move (From : Natural; To : Natural);
+ -- A procedure that moves the data item with index value From to the data
+ -- item with index value To (the old value in To being lost). An index
+ -- value of zero is used for moves from and to a single temporary location
+ -- used by the sort.
+
+ with function Lt (Op1, Op2 : Natural) return Boolean;
+ -- A function that compares two items and returns True if the item with
+ -- index Op1 is less than the item with Index Op2, and False if the Op2
+ -- item is greater than or equal to the Op1 item.
+
+package GNAT.Bubble_Sort_G is
+ pragma Pure;
+
+ procedure Sort (N : Natural);
+ -- This procedures sorts items in the range from 1 to N into ascending
+ -- order making calls to Lt to do required comparisons, and Move to move
+ -- items around. Note that, as described above, both Move and Lt use a
+ -- single temporary location with index value zero. This sort is stable,
+ -- that is the order of equal elements in the input is preserved.
+
+end GNAT.Bubble_Sort_G;