mirror of
https://github.com/darlinghq/darling-WTF.git
synced 2024-11-23 11:59:47 +00:00
113 lines
3.7 KiB
C++
113 lines
3.7 KiB
C++
/*
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* Copyright (C) 2013 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. AND ITS CONTRIBUTORS ``AS IS''
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* 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<typename Predicate, typename Iterator>
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class FilterIterator {
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WTF_MAKE_FAST_ALLOCATED;
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public:
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FilterIterator(Predicate pred, Iterator begin, Iterator end)
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: m_pred(WTFMove(pred))
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, m_iter(WTFMove(begin))
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, m_end(WTFMove(end))
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{
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while (m_iter != m_end && !m_pred(*m_iter))
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++m_iter;
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}
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FilterIterator& operator++()
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{
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while (m_iter != m_end) {
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++m_iter;
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if (m_iter == m_end || m_pred(*m_iter))
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break;
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}
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return *this;
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}
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const typename std::remove_const<decltype(*std::declval<Iterator>())>::type operator*() const
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{
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ASSERT(m_iter != m_end);
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ASSERT(m_pred(*m_iter));
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return *m_iter;
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}
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inline bool operator==(FilterIterator& other) const { return m_iter == other.m_iter; }
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inline bool operator!=(FilterIterator& other) const { return m_iter != other.m_iter; }
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private:
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const Predicate m_pred;
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Iterator m_iter;
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Iterator m_end;
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};
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template<typename Predicate, typename Iterator>
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inline FilterIterator<Predicate, Iterator> makeFilterIterator(Predicate&& pred, Iterator&& begin, Iterator&& end)
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{
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return FilterIterator<Predicate, Iterator>(std::forward<Predicate>(pred), std::forward<Iterator>(begin), std::forward<Iterator>(end));
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}
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template<typename Transform, typename Iterator>
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class TransformIterator {
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WTF_MAKE_FAST_ALLOCATED;
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public:
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TransformIterator(Transform&& transform, Iterator&& iter)
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: m_transform(WTFMove(transform))
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, m_iter(WTFMove(iter))
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{
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}
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TransformIterator& operator++()
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{
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++m_iter;
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return *this;
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}
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const typename std::remove_const<decltype(std::declval<Transform>()(*std::declval<Iterator>()))>::type operator*() const
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{
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return m_transform(*m_iter);
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}
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inline bool operator==(TransformIterator& other) const { return m_iter == other.m_iter; }
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inline bool operator!=(TransformIterator& other) const { return m_iter != other.m_iter; }
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private:
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const Transform m_transform;
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Iterator m_iter;
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};
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template<typename Transform, typename Iterator>
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inline TransformIterator<Transform, Iterator> makeTransformIterator(Transform&& transform, Iterator&& iter)
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{
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return TransformIterator<Transform, Iterator>(WTFMove(transform), WTFMove(iter));
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}
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} // namespace WTF
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