83 lines
2.5 KiB
C++
83 lines
2.5 KiB
C++
/*
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* Copyright (C) 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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#include <type_traits>
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namespace WTF {
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template<class Container>
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class IndexedContainerIterator {
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WTF_MAKE_FAST_ALLOCATED;
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public:
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IndexedContainerIterator()
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: m_container(nullptr)
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, m_index(0)
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{
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}
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IndexedContainerIterator(const Container& container, unsigned index)
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: m_container(&container)
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, m_index(findNext(index))
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{
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}
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auto operator*() -> typename std::result_of<decltype(&Container::at)(const Container, unsigned)>::type
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{
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return m_container->at(m_index);
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}
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IndexedContainerIterator& operator++()
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{
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m_index = findNext(m_index + 1);
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return *this;
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}
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bool operator==(const IndexedContainerIterator& other) const
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{
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ASSERT(m_container == other.m_container);
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return m_index == other.m_index;
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}
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bool operator!=(const IndexedContainerIterator& other) const
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{
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return !(*this == other);
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}
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private:
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unsigned findNext(unsigned index)
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{
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while (index < m_container->size() && !m_container->at(index))
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index++;
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return index;
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}
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const Container* m_container;
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unsigned m_index;
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};
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} // namespace WTF
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