File : g-busorg.ads
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 -- --
19 -- --
20 -- --
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
46 generic
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
62 package 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
72 end GNAT.Bubble_Sort_G;