------------------------------------------------------------------------------
--                                                                          --
--                         GNAT RUNTIME COMPONENTS                          --
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--                   G N A T . B U B B L E _ S O R T _ G                    --
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--                            $Revision: 1.2 $                              --
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--             Copyright (C) 1995 Free Software Foundation, Inc.            --
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------------------------------------------------------------------------------

--  This package provides a generic bubble sort routine that can be used with
--  different types of data. See also GNAT.Heap_Sort_A, a version that works
--  with subprogram parameters, allowing code sharing. The generic version
--  is slightly more efficient but does not allow code sharing.

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 From to the data item
   --  with Index To. 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 Preelaborate (Bubble_Sort_G);

   procedure Sort (N : Positive);
   --  This procedures sorts items indexed 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 not stable,
   --  i.e. the order of equal elements in the input is not preserved.

end GNAT.Bubble_Sort_G;
