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authorSteve Block <steveblock@google.com>2011-05-06 11:45:16 +0100
committerSteve Block <steveblock@google.com>2011-05-12 13:44:10 +0100
commitcad810f21b803229eb11403f9209855525a25d57 (patch)
tree29a6fd0279be608e0fe9ffe9841f722f0f4e4269 /JavaScriptCore/wtf/NonCopyingSort.h
parent121b0cf4517156d0ac5111caf9830c51b69bae8f (diff)
downloadexternal_webkit-cad810f21b803229eb11403f9209855525a25d57.zip
external_webkit-cad810f21b803229eb11403f9209855525a25d57.tar.gz
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Merge WebKit at r75315: Initial merge by git.
Change-Id: I570314b346ce101c935ed22a626b48c2af266b84
Diffstat (limited to 'JavaScriptCore/wtf/NonCopyingSort.h')
-rw-r--r--JavaScriptCore/wtf/NonCopyingSort.h89
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diff --git a/JavaScriptCore/wtf/NonCopyingSort.h b/JavaScriptCore/wtf/NonCopyingSort.h
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-/*
- * Copyright (C) 2010 Apple Inc. All Rights Reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
- * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
- * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *
- */
-
-#ifndef WTF_NonCopyingSort_h
-#define WTF_NonCopyingSort_h
-
-namespace WTF {
-
-using std::swap;
-
-template<typename RandomAccessIterator, typename Predicate>
-inline void siftDown(RandomAccessIterator array, ptrdiff_t start, ptrdiff_t end, Predicate compareLess)
-{
- ptrdiff_t root = start;
-
- while (root * 2 + 1 <= end) {
- ptrdiff_t child = root * 2 + 1;
- if (child < end && compareLess(array[child], array[child + 1]))
- child++;
-
- if (compareLess(array[root], array[child])) {
- swap(array[root], array[child]);
- root = child;
- } else
- return;
- }
-}
-
-template<typename RandomAccessIterator, typename Predicate>
-inline void heapify(RandomAccessIterator array, ptrdiff_t count, Predicate compareLess)
-{
- ptrdiff_t start = (count - 2) / 2;
-
- while (start >= 0) {
- siftDown(array, start, count - 1, compareLess);
- start--;
- }
-}
-
-template<typename RandomAccessIterator, typename Predicate>
-void heapSort(RandomAccessIterator start, RandomAccessIterator end, Predicate compareLess)
-{
- ptrdiff_t count = end - start;
- heapify(start, count, compareLess);
-
- ptrdiff_t endIndex = count - 1;
- while (endIndex > 0) {
- swap(start[endIndex], start[0]);
- siftDown(start, 0, endIndex - 1, compareLess);
- endIndex--;
- }
-}
-
-template<typename RandomAccessIterator, typename Predicate>
-inline void nonCopyingSort(RandomAccessIterator start, RandomAccessIterator end, Predicate compareLess)
-{
- // heapsort happens to use only swaps, not copies, but the essential thing about
- // this function is the fact that it does not copy, not the specific algorithm
- heapSort(start, end, compareLess);
-}
-
-} // namespace WTF
-
-using WTF::nonCopyingSort;
-
-#endif // WTF_NonCopyingSort_h