85 lines
2.1 KiB
C++
85 lines
2.1 KiB
C++
/*
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* Copyright (C) 2015 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef ART_RUNTIME_STRIDE_ITERATOR_H_
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#define ART_RUNTIME_STRIDE_ITERATOR_H_
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#include <iterator>
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#include "base/logging.h"
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namespace art {
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template<typename T>
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class StrideIterator : public std::iterator<std::forward_iterator_tag, T> {
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public:
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StrideIterator(const StrideIterator&) = default;
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StrideIterator(StrideIterator&&) = default;
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StrideIterator& operator=(const StrideIterator&) = default;
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StrideIterator& operator=(StrideIterator&&) = default;
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StrideIterator(T* ptr, size_t stride)
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: ptr_(reinterpret_cast<uintptr_t>(ptr)),
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stride_(stride) {}
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bool operator==(const StrideIterator& other) const {
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DCHECK_EQ(stride_, other.stride_);
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return ptr_ == other.ptr_;
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}
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bool operator!=(const StrideIterator& other) const {
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return !(*this == other);
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}
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StrideIterator operator++() { // Value after modification.
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ptr_ += stride_;
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return *this;
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}
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StrideIterator operator++(int) {
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StrideIterator<T> temp = *this;
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ptr_ += stride_;
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return temp;
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}
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StrideIterator operator+(ssize_t delta) const {
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StrideIterator<T> temp = *this;
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temp += delta;
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return temp;
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}
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StrideIterator& operator+=(ssize_t delta) {
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ptr_ += static_cast<ssize_t>(stride_) * delta;
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return *this;
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}
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T& operator*() const {
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return *reinterpret_cast<T*>(ptr_);
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}
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T* operator->() const {
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return &**this;
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}
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private:
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uintptr_t ptr_;
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// Not const for operator=.
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size_t stride_;
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};
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} // namespace art
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#endif // ART_RUNTIME_STRIDE_ITERATOR_H_
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