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1 706 jeremybenn
------------------------------------------------------------------------------
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--                                                                          --
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--                         GNAT RUN-TIME COMPONENTS                         --
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--                                                                          --
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--                     G N A T . B U B B L E _ S O R T                      --
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--                                                                          --
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--                                 S p e c                                  --
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--                                                                          --
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--                     Copyright (C) 1995-2010, AdaCore                     --
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--                                                                          --
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-- GNAT is free software;  you can  redistribute it  and/or modify it under --
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-- terms of the  GNU General Public License as published  by the Free Soft- --
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-- ware  Foundation;  either version 3,  or (at your option) any later ver- --
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-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
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--                                                                          --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception,   --
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-- version 3.1, as published by the Free Software Foundation.               --
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--                                                                          --
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-- You should have received a copy of the GNU General Public License and    --
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-- a copy of the GCC Runtime Library Exception along with this program;     --
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-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
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-- <http://www.gnu.org/licenses/>.                                          --
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--                                                                          --
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-- GNAT was originally developed  by the GNAT team at  New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc.      --
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--                                                                          --
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------------------------------------------------------------------------------
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--  Sort Utility (Using Bubblesort Algorithm)
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--  This package provides a bubblesort routine that works with access to
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--  subprogram parameters, so that it can be used with different types with
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--  shared sorting code.
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--  See also GNAT.Bubble_Sort_G and GNAT.Bubble_Sort_A. These are older
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--  versions of this routine. In some cases GNAT.Bubble_Sort_G may be a
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--  little faster than GNAT.Bubble_Sort, at the expense of generic code
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--  duplication and a less convenient interface. The generic version also
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--  has the advantage of being Pure, while this unit can only be Preelaborate.
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package GNAT.Bubble_Sort is
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   pragma Pure;
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   --  The data to be sorted is assumed to be indexed by integer values from
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   --  1 to N, where N is the number of items to be sorted.
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   type Xchg_Procedure is access procedure (Op1, Op2 : Natural);
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   --  A pointer to a procedure that exchanges the two data items whose
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   --  index values are Op1 and Op2.
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   type Lt_Function is access function (Op1, Op2 : Natural) return Boolean;
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   --  A pointer to a function that compares two items and returns True if
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   --  the item with index value Op1 is less than the item with Index value
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   --  Op2, and False if the Op1 item is greater than or equal to the Op2
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   --  item.
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   procedure Sort (N : Natural; Xchg : Xchg_Procedure; Lt : Lt_Function);
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   --  This procedures sorts items in the range from 1 to N into ascending
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   --  order making calls to Lt to do required comparisons, and calls to
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   --  Xchg to exchange items. The sort is stable, that is the order of
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   --  equal items in the input is preserved.
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end GNAT.Bubble_Sort;

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