84 lines
3.0 KiB
C++
84 lines
3.0 KiB
C++
/*
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* Copyright (C) 2013, 2015-2016 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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namespace WTF {
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template<typename T>
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class Insertion {
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WTF_MAKE_FAST_ALLOCATED;
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public:
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Insertion() { }
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template<typename U>
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Insertion(size_t index, U&& element)
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: m_index(index)
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, m_element(std::forward<U>(element))
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{
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}
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size_t index() const { return m_index; }
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const T& element() const { return m_element; }
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T& element() { return m_element; }
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bool operator<(const Insertion& other) const
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{
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return m_index < other.m_index;
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}
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private:
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size_t m_index { 0 };
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T m_element { };
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};
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template<typename TargetVectorType, typename InsertionVectorType>
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size_t executeInsertions(TargetVectorType& target, InsertionVectorType& insertions)
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{
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size_t numInsertions = insertions.size();
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if (!numInsertions)
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return 0;
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size_t originalTargetSize = target.size();
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target.grow(target.size() + numInsertions);
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size_t lastIndex = target.size();
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for (size_t indexInInsertions = numInsertions; indexInInsertions--;) {
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ASSERT(!indexInInsertions || insertions[indexInInsertions].index() >= insertions[indexInInsertions - 1].index());
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ASSERT_UNUSED(originalTargetSize, insertions[indexInInsertions].index() <= originalTargetSize);
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size_t firstIndex = insertions[indexInInsertions].index() + indexInInsertions;
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size_t indexOffset = indexInInsertions + 1;
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for (size_t i = lastIndex; --i > firstIndex;)
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target[i] = WTFMove(target[i - indexOffset]);
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target[firstIndex] = WTFMove(insertions[indexInInsertions].element());
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lastIndex = firstIndex;
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}
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insertions.shrink(0);
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return numInsertions;
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}
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} // namespace WTF
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using WTF::Insertion;
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using WTF::executeInsertions;
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