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