1------------------------------------------------------------------------------ 2-- -- 3-- GNAT RUN-TIME COMPONENTS -- 4-- -- 5-- G N A T . B U B B L E _ S O R T _ G -- 6-- -- 7-- S p e c -- 8-- -- 9-- Copyright (C) 1995-2010, AdaCore -- 10-- -- 11-- GNAT is free software; you can redistribute it and/or modify it under -- 12-- terms of the GNU General Public License as published by the Free Soft- -- 13-- ware Foundation; either version 3, or (at your option) any later ver- -- 14-- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- 15-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- 16-- or FITNESS FOR A PARTICULAR PURPOSE. -- 17-- -- 18-- As a special exception under Section 7 of GPL version 3, you are granted -- 19-- additional permissions described in the GCC Runtime Library Exception, -- 20-- version 3.1, as published by the Free Software Foundation. -- 21-- -- 22-- You should have received a copy of the GNU General Public License and -- 23-- a copy of the GCC Runtime Library Exception along with this program; -- 24-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see -- 25-- <http://www.gnu.org/licenses/>. -- 26-- -- 27-- GNAT was originally developed by the GNAT team at New York University. -- 28-- Extensive contributions were provided by Ada Core Technologies Inc. -- 29-- -- 30------------------------------------------------------------------------------ 31 32-- Bubblesort generic package using formal procedures 33 34-- This package provides a generic bubble sort routine that can be used with 35-- different types of data. 36 37-- See also GNAT.Bubble_Sort, a version that works with subprogram access 38-- parameters, allowing code sharing. The generic version is slightly more 39-- efficient but does not allow code sharing and has an interface that is 40-- more awkward to use. 41 42-- There is also GNAT.Bubble_Sort_A, which is now considered obsolete, but 43-- was an older version working with subprogram parameters. This version 44-- is retained for backwards compatibility with old versions of GNAT. 45 46generic 47 -- The data to be sorted is assumed to be indexed by integer values from 48 -- 1 to N, where N is the number of items to be sorted. In addition, the 49 -- index value zero is used for a temporary location used during the sort. 50 51 with procedure Move (From : Natural; To : Natural); 52 -- A procedure that moves the data item with index value From to the data 53 -- item with index value To (the old value in To being lost). An index 54 -- value of zero is used for moves from and to a single temporary location 55 -- used by the sort. 56 57 with function Lt (Op1, Op2 : Natural) return Boolean; 58 -- A function that compares two items and returns True if the item with 59 -- index Op1 is less than the item with Index Op2, and False if the Op2 60 -- item is greater than or equal to the Op1 item. 61 62package GNAT.Bubble_Sort_G is 63 pragma Pure; 64 65 procedure Sort (N : Natural); 66 -- This procedures sorts items in the range from 1 to N into ascending 67 -- order making calls to Lt to do required comparisons, and Move to move 68 -- items around. Note that, as described above, both Move and Lt use a 69 -- single temporary location with index value zero. This sort is stable, 70 -- that is the order of equal elements in the input is preserved. 71 72end GNAT.Bubble_Sort_G; 73