# Ada Programming/Libraries/GNAT.Bubble Sort

< Ada Programming | Libraries

------------------------------------------------------------------------------ -- -- -- GNAT RUN-TIME COMPONENTS -- -- -- -- G N A T . B U B B L E _ S O R T -- -- -- -- S p e c -- -- -- -- Copyright (C) 1995-2005, AdaCore -- -- -- -- GNAT is free software; you can redistribute it and/or modify it under -- -- terms of the GNU General Public License as published by the Free Soft- -- -- ware Foundation; either version 2, or (at your option) any later ver- -- -- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License -- -- for more details. You should have received a copy of the GNU General -- -- Public License distributed with GNAT; see file COPYING. If not, write -- -- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, -- -- Boston, MA 02110-1301, USA. -- -- -- -- -- -- -- -- -- -- -- GNAT was originally developed by the GNAT team at New York University. -- -- Extensive contributions were provided by Ada Core Technologies Inc. -- -- -- ------------------------------------------------------------------------------ -- Sort Utility (Using Bubblesort Algorithm) -- This package provides a bubblesort routine that works with access to -- subprogram parameters, so that it can be used with different types with -- shared sorting code. -- See also GNAT.Bubble_Sort_G and GNAT.Bubble_Sort_A. These are older -- versions of this routine. In some cases GNAT.Bubble_Sort_G may be a -- little faster than GNAT.Bubble_Sort, at the expense of generic code -- duplication and a less convenient interface. The generic version also -- has the advantage of being Pure, while this unit can only be Preelaborate. package GNAT.Bubble_Sort 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. type Xchg_Procedure is access procedure (Op1, Op2 : Natural); -- A pointer to a procedure that exchanges the two data items whose -- index values are Op1 and Op2. 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 value Op1 is less than the item with Index value -- Op2, and False if the Op1 item is greater than or equal to the Op2 -- item. procedure Sort (N : Natural; Xchg : Xchg_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 calls to -- Xchg to exchange items. The sort is stable, that is the order of -- equal items in the input is preserved. end GNAT.Bubble_Sort;