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Diffstat (limited to 'runtime/stride_iterator.h')
-rw-r--r-- | runtime/stride_iterator.h | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/runtime/stride_iterator.h b/runtime/stride_iterator.h new file mode 100644 index 0000000000..5971524d81 --- /dev/null +++ b/runtime/stride_iterator.h @@ -0,0 +1,70 @@ +/* + * 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_ |