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git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/base/trunk@35574 72102866-910b-0410-8b05-ffd578937521
92 lines
2.5 KiB
Objective-C
92 lines
2.5 KiB
Objective-C
/* Implementation of QuickSort for GNUStep
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Copyright (C) 2005-2012 Free Software Foundation, Inc.
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Written by: Saso Kiselkov <diablos@manga.sk>
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Date: 2005
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Modified by: Niels Grewe <niels.grewe@halbordnung.de>
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Date: September 2012
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This file is part of the GNUstep Base Library.
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free
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Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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Boston, MA 02111 USA.
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*/
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#import "Foundation/NSSortDescriptor.h"
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#import "Foundation/NSArray.h"
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#import "Foundation/NSObjCRuntime.h"
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#import "GSSorting.h"
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/// Swaps the two provided objects.
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static inline void
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SwapObjects(id * o1, id * o2)
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{
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id temp;
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temp = *o1;
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*o1 = *o2;
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*o2 = temp;
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}
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/**
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* Sorts the provided object array's sortRange according to sortDescriptor.
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*/
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// Quicksort algorithm copied from Wikipedia :-).
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#ifndef GS_DISABLE_QUICKSORT
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static void
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_GSQuickSort(id *objects,
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NSRange sortRange,
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id comparisonEntity,
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GSComparisonType type,
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void *context)
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{
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if (sortRange.length > 1)
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{
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id pivot = objects[sortRange.location];
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unsigned int left = sortRange.location + 1;
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unsigned int right = NSMaxRange(sortRange);
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while (left < right)
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{
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if (GSCompareUsingDescriptorOrComparator(left, right,
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comparisonEntity, type, context) == NSOrderedDescending)
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{
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SwapObjects(&objects[left], &objects[--right]);
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}
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else
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{
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left++;
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}
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}
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SwapObjects(&objects[--left], &objects[sortRange.location]);
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SortObjectsWithDescriptor(objects, NSMakeRange(sortRange.location, left
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- sortRange.location), sortDescriptor);
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SortObjectsWithDescriptor(objects, NSMakeRange(right,
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NSMaxRange(sortRange) - right), sortDescriptor);
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}
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}
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@interface GSQuickSortPlaceHolder : NSObject
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@end
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@implementation GSQuickSortPlaceHolder
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+ (void) load
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{
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_GSSortUnstable = _GSQuickSort;
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}
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@end
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#endif
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