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1 ------------------------------------------------------------------------------
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2 -- --
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3 -- GNAT RUN-TIME COMPONENTS --
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4 -- --
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5 -- G N A T . B U B B L E _ S O R T _ G --
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6 -- --
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7 -- S p e c --
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8 -- --
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145
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9 -- Copyright (C) 1995-2019, AdaCore --
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111
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10 -- --
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11 -- GNAT is free software; you can redistribute it and/or modify it under --
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12 -- terms of the GNU General Public License as published by the Free Soft- --
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13 -- ware Foundation; either version 3, or (at your option) any later ver- --
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14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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16 -- or FITNESS FOR A PARTICULAR PURPOSE. --
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17 -- --
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18 -- As a special exception under Section 7 of GPL version 3, you are granted --
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19 -- additional permissions described in the GCC Runtime Library Exception, --
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20 -- version 3.1, as published by the Free Software Foundation. --
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21 -- --
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22 -- You should have received a copy of the GNU General Public License and --
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23 -- a copy of the GCC Runtime Library Exception along with this program; --
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24 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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25 -- <http://www.gnu.org/licenses/>. --
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26 -- --
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27 -- GNAT was originally developed by the GNAT team at New York University. --
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28 -- Extensive contributions were provided by Ada Core Technologies Inc. --
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29 -- --
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30 ------------------------------------------------------------------------------
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31
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32 -- Bubblesort generic package using formal procedures
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33
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34 -- This package provides a generic bubble sort routine that can be used with
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35 -- different types of data.
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36
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37 -- See also GNAT.Bubble_Sort, a version that works with subprogram access
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38 -- parameters, allowing code sharing. The generic version is slightly more
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39 -- efficient but does not allow code sharing and has an interface that is
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40 -- more awkward to use.
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41
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42 -- There is also GNAT.Bubble_Sort_A, which is now considered obsolete, but
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43 -- was an older version working with subprogram parameters. This version
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44 -- is retained for backwards compatibility with old versions of GNAT.
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45
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46 generic
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47 -- The data to be sorted is assumed to be indexed by integer values from
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48 -- 1 to N, where N is the number of items to be sorted. In addition, the
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49 -- index value zero is used for a temporary location used during the sort.
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50
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51 with procedure Move (From : Natural; To : Natural);
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52 -- A procedure that moves the data item with index value From to the data
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53 -- item with index value To (the old value in To being lost). An index
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54 -- value of zero is used for moves from and to a single temporary location
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55 -- used by the sort.
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56
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57 with function Lt (Op1, Op2 : Natural) return Boolean;
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58 -- A function that compares two items and returns True if the item with
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59 -- index Op1 is less than the item with Index Op2, and False if the Op2
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60 -- item is greater than or equal to the Op1 item.
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61
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62 package GNAT.Bubble_Sort_G is
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63 pragma Pure;
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64
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65 procedure Sort (N : Natural);
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66 -- This procedures sorts items in the range from 1 to N into ascending
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67 -- order making calls to Lt to do required comparisons, and Move to move
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68 -- items around. Note that, as described above, both Move and Lt use a
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69 -- single temporary location with index value zero. This sort is stable,
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70 -- that is the order of equal elements in the input is preserved.
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71
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72 end GNAT.Bubble_Sort_G;
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