Ada Programming/Libraries/GNAT.Bubble Sort G
------------------------------------------------------------------------------ -- -- -- 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) 1995-2005, 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 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. -- -- -- -- -- -- -- -- -- -- -- 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. The generic version is also Pure, while the access -- subprograqm version can only be Preelaborate. -- 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;