Ada Programming/Libraries/GNAT.Bubble Sort A

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-- Bubblesort using access to procedure parameters

-- This package provides a bubble sort routine that works with access to --  subprogram parameters, so that it can be used with different types with -- shared sorting code. It is considered obsoleted by GNAT.Bubble_Sort which -- offers a similar routine with a more convenient interface.

package GNAT.Bubble_Sort_A is  pragma Preelaborate;

-- 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.

type Move_Procedure is access procedure (From : Natural; To : Natural); -- A pointer to 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 the single temporary location used by the sort.

type Lt_Function is access function (Op1, Op2 : Natural) return Boolean; -- A pointer to 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.

procedure Sort (N : Natural; Move : Move_Procedure; Lt : Lt_Function); -- 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 not -- stable, i.e. the order of equal elements in the input is not preserved.

end GNAT.Bubble_Sort_A;

|GNAT.Bubble Sort A