1------------------------------------------------------------------------------ 2-- -- 3-- GNAT RUN-TIME COMPONENTS -- 4-- -- 5-- G N A T . B U B B L E _ S O R T _ A -- 6-- -- 7-- S p e c -- 8-- -- 9-- Copyright (C) 1995-2010, AdaCore -- 10-- -- 11-- GNAT is free software; you can redistribute it and/or modify it under -- 12-- terms of the GNU General Public License as published by the Free Soft- -- 13-- ware Foundation; either version 3, or (at your option) any later ver- -- 14-- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- 15-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- 16-- or FITNESS FOR A PARTICULAR PURPOSE. -- 17-- -- 18-- As a special exception under Section 7 of GPL version 3, you are granted -- 19-- additional permissions described in the GCC Runtime Library Exception, -- 20-- version 3.1, as published by the Free Software Foundation. -- 21-- -- 22-- You should have received a copy of the GNU General Public License and -- 23-- a copy of the GCC Runtime Library Exception along with this program; -- 24-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see -- 25-- <http://www.gnu.org/licenses/>. -- 26-- -- 27-- GNAT was originally developed by the GNAT team at New York University. -- 28-- Extensive contributions were provided by Ada Core Technologies Inc. -- 29-- -- 30------------------------------------------------------------------------------ 31 32-- Bubblesort using access to procedure parameters 33 34-- This package provides a bubble sort routine that works with access to 35-- subprogram parameters, so that it can be used with different types with 36-- shared sorting code. It is considered obsoleted by GNAT.Bubble_Sort which 37-- offers a similar routine with a more convenient interface. 38 39package GNAT.Bubble_Sort_A is 40 pragma Preelaborate; 41 42 -- The data to be sorted is assumed to be indexed by integer values from 43 -- 1 to N, where N is the number of items to be sorted. In addition, the 44 -- index value zero is used for a temporary location used during the sort. 45 46 type Move_Procedure is access procedure (From : Natural; To : Natural); 47 -- A pointer to a procedure that moves the data item with index From to 48 -- the data item with index To. An index value of zero is used for moves 49 -- from and to the single temporary location used by the sort. 50 51 type Lt_Function is access function (Op1, Op2 : Natural) return Boolean; 52 -- A pointer to a function that compares two items and returns True if 53 -- the item with index Op1 is less than the item with index Op2, and False 54 -- if the Op2 item is greater than or equal to the Op1 item. 55 56 procedure Sort (N : Natural; Move : Move_Procedure; Lt : Lt_Function); 57 -- This procedures sorts items in the range from 1 to N into ascending 58 -- order making calls to Lt to do required comparisons, and Move to move 59 -- items around. Note that, as described above, both Move and Lt use a 60 -- single temporary location with index value zero. This sort is not 61 -- stable, i.e. the order of equal elements in the input is not preserved. 62 63end GNAT.Bubble_Sort_A; 64