1 /* 2 * Copyright (C) 2015 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef ART_RUNTIME_STRIDE_ITERATOR_H_ 18 #define ART_RUNTIME_STRIDE_ITERATOR_H_ 19 20 #include <iterator> 21 22 namespace art { 23 24 template<typename T> 25 class StrideIterator : public std::iterator<std::forward_iterator_tag, T> { 26 public: 27 StrideIterator(const StrideIterator&) = default; 28 StrideIterator(StrideIterator&&) = default; 29 StrideIterator& operator=(const StrideIterator&) = default; 30 StrideIterator& operator=(StrideIterator&&) = default; 31 32 StrideIterator(uintptr_t ptr, size_t stride) 33 : ptr_(ptr), stride_(stride) { 34 } 35 36 bool operator==(const StrideIterator& other) const { 37 return ptr_ == other.ptr_; 38 } 39 40 bool operator!=(const StrideIterator& other) const { 41 return !(*this == other); 42 } 43 44 StrideIterator operator++() { // Value after modification. 45 ptr_ += stride_; 46 return *this; 47 } 48 49 StrideIterator operator++(int) { 50 auto temp = *this; 51 ptr_ += stride_; 52 return temp; 53 } 54 55 T& operator*() const { 56 return *reinterpret_cast<T*>(ptr_); 57 } 58 59 T* operator->() const { 60 return &**this; 61 } 62 63 private: 64 uintptr_t ptr_; 65 size_t stride_; 66 }; 67 68 } // namespace art 69 70 #endif // ART_RUNTIME_STRIDE_ITERATOR_H_ 71
