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