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-rw-r--r--runtime/stride_iterator.h70
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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>
+
+namespace art {
+
+template<typename T>
+class StrideIterator : public std::iterator<std::random_access_iterator_tag, T> {
+ public:
+ StrideIterator(const StrideIterator&) = default;
+ StrideIterator(StrideIterator&&) = default;
+ StrideIterator& operator=(const StrideIterator&) = default;
+ StrideIterator& operator=(StrideIterator&&) = default;
+
+ StrideIterator(uintptr_t ptr, size_t stride)
+ : ptr_(ptr), stride_(stride) {
+ }
+
+ bool operator==(const StrideIterator& other) const {
+ 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) {
+ auto temp = *this;
+ ptr_ += stride_;
+ return temp;
+ }
+
+ T& operator*() const {
+ return *reinterpret_cast<T*>(ptr_);
+ }
+
+ T* operator->() const {
+ return &**this;
+ }
+
+ private:
+ uintptr_t ptr_;
+ const size_t stride_;
+};
+
+} // namespace art
+
+#endif // ART_RUNTIME_STRIDE_ITERATOR_H_