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/*
* Copyright (C) 2018-2023 Intel Corporation
*
* SPDX-License-Identifier: MIT
*
*/
#pragma once
#include <cstddef>
#include <utility>
template <typename DataType>
class ArrayRef {
public:
using iterator = DataType *;
using const_iterator = const DataType *;
template <typename IteratorType>
ArrayRef(IteratorType begIt, IteratorType endIt) {
if (begIt != nullptr) {
this->begIt = &*begIt;
this->endIt = &*(endIt - 1) + 1;
} else {
this->begIt = nullptr;
this->endIt = nullptr;
}
}
template <typename IteratorType>
ArrayRef(IteratorType first, size_t size)
: ArrayRef(first, (size > 0) ? (first + size) : first) {
}
template <typename SequentialContainerType>
ArrayRef(SequentialContainerType &ctr)
: begIt((ctr.size() > 0) ? &*ctr.begin() : nullptr), endIt((ctr.size() > 0) ? (&*(ctr.end() - 1) + 1) : nullptr) {
}
template <typename SequentialContainerType>
ArrayRef(const SequentialContainerType &ctr)
: begIt((ctr.size() > 0) ? &*ctr.begin() : nullptr), endIt((ctr.size() > 0) ? (&*(ctr.end() - 1) + 1) : nullptr) {
}
template <size_t size>
ArrayRef(DataType (&array)[size])
: begIt(&array[0]), endIt(&array[size]) {
}
ArrayRef() = default;
ArrayRef(const ArrayRef &src)
: begIt(src.begIt), endIt(src.endIt) {
}
ArrayRef &operator=(const ArrayRef &src) {
if (this == &src) {
return *this;
}
this->begIt = src.begIt;
this->endIt = src.endIt;
return *this;
}
void clear() {
endIt = begIt;
}
size_t size() const {
return endIt - begIt;
}
bool empty() const {
return (0U == size());
}
DataType &operator[](std::size_t idx) {
return begIt[idx];
}
const DataType &operator[](std::size_t idx) const {
return begIt[idx];
}
iterator begin() {
return begIt;
}
const_iterator begin() const {
return begIt;
}
iterator end() {
return endIt;
}
const_iterator end() const {
return endIt;
}
void swap(ArrayRef &rhs) {
std::swap(begIt, rhs.begIt);
std::swap(endIt, rhs.endIt);
}
operator ArrayRef<const DataType>() {
return ArrayRef<const DataType>(begIt, endIt);
}
template <typename AnyT>
static ArrayRef<DataType> fromAny(AnyT *any, size_t anyCount) {
static_assert((sizeof(AnyT) == sizeof(DataType)) || ((sizeof(AnyT) % sizeof(DataType)) == 0), "Unhandled type conversion");
return ArrayRef<DataType>(reinterpret_cast<iterator>(any), (anyCount * sizeof(AnyT)) / sizeof(DataType));
}
template <typename AnyT>
ArrayRef<AnyT> toArrayRef() {
static_assert((sizeof(AnyT) == sizeof(DataType)) || ((sizeof(DataType) % sizeof(AnyT)) == 0), "Unhandled type conversion");
return ArrayRef<AnyT>(reinterpret_cast<typename ArrayRef<AnyT>::iterator>(begIt), (this->size() * sizeof(DataType)) / sizeof(AnyT));
}
private:
DataType *begIt = nullptr;
DataType *endIt = nullptr;
};
template <typename T>
bool operator==(const ArrayRef<T> &lhs,
const ArrayRef<T> &rhs) {
if (lhs.size() != rhs.size()) {
return false;
}
auto lhsIt = lhs.begin();
auto lhsEnd = lhs.end();
auto rhsIt = rhs.begin();
for (; lhsIt != lhsEnd; ++lhsIt, ++rhsIt) {
if (*lhsIt != *rhsIt) {
return false;
}
}
return true;
}
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