Ada Programming/Libraries/GNAT.Bubble Sort A
------------------------------------------------------------------------------ -- -- -- GNAT RUN-TIME COMPONENTS -- -- -- -- G N A T . B U B B L E _ S O R T _ A -- -- -- -- 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. -- -- -- ------------------------------------------------------------------------------ -- 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;