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| |
| #ifndef QARRAYDATAPOINTER_H |
| #define QARRAYDATAPOINTER_H |
| |
| #include <QtCore/qarraydataops.h> |
| |
| QT_BEGIN_NAMESPACE |
| |
| template <class T> |
| struct QArrayDataPointer |
| { |
| private: |
| typedef QTypedArrayData<T> Data; |
| typedef QArrayDataOps<T> DataOps; |
| |
| public: |
| QArrayDataPointer() noexcept |
| : d(Data::sharedNull()) |
| { |
| } |
| |
| QArrayDataPointer(const QArrayDataPointer &other) |
| : d(other.d->ref.ref() |
| ? other.d |
| : other.clone(other.d->cloneFlags())) |
| { |
| } |
| |
| explicit QArrayDataPointer(QTypedArrayData<T> *ptr) |
| : d(ptr) |
| { |
| Q_CHECK_PTR(ptr); |
| } |
| |
| QArrayDataPointer(QArrayDataPointerRef<T> ref) |
| : d(ref.ptr) |
| { |
| } |
| |
| QArrayDataPointer &operator=(const QArrayDataPointer &other) |
| { |
| QArrayDataPointer tmp(other); |
| this->swap(tmp); |
| return *this; |
| } |
| |
| QArrayDataPointer(QArrayDataPointer &&other) noexcept |
| : d(other.d) |
| { |
| other.d = Data::sharedNull(); |
| } |
| |
| QArrayDataPointer &operator=(QArrayDataPointer &&other) noexcept |
| { |
| QArrayDataPointer moved(std::move(other)); |
| this->swap(moved); |
| return *this; |
| } |
| |
| DataOps &operator*() const |
| { |
| Q_ASSERT(d); |
| return *static_cast<DataOps *>(d); |
| } |
| |
| DataOps *operator->() const |
| { |
| Q_ASSERT(d); |
| return static_cast<DataOps *>(d); |
| } |
| |
| ~QArrayDataPointer() |
| { |
| if (!d->ref.deref()) { |
| if (d->isMutable()) |
| (*this)->destroyAll(); |
| Data::deallocate(d); |
| } |
| } |
| |
| bool isNull() const |
| { |
| return d == Data::sharedNull(); |
| } |
| |
| Data *data() const |
| { |
| return d; |
| } |
| |
| bool needsDetach() const |
| { |
| return (!d->isMutable() || d->ref.isShared()); |
| } |
| |
| #if !defined(QT_NO_UNSHARABLE_CONTAINERS) |
| void setSharable(bool sharable) |
| { |
| if (needsDetach()) { |
| Data *detached = clone(sharable |
| ? d->detachFlags() & ~QArrayData::Unsharable |
| : d->detachFlags() | QArrayData::Unsharable); |
| QArrayDataPointer old(d); |
| d = detached; |
| } else { |
| d->ref.setSharable(sharable); |
| } |
| } |
| |
| bool isSharable() const { return d->isSharable(); } |
| #endif |
| |
| void swap(QArrayDataPointer &other) noexcept |
| { |
| qSwap(d, other.d); |
| } |
| |
| void clear() |
| { |
| QArrayDataPointer tmp(d); |
| d = Data::sharedNull(); |
| } |
| |
| bool detach() |
| { |
| if (needsDetach()) { |
| Data *copy = clone(d->detachFlags()); |
| QArrayDataPointer old(d); |
| d = copy; |
| return true; |
| } |
| |
| return false; |
| } |
| |
| private: |
| Q_REQUIRED_RESULT Data *clone(QArrayData::AllocationOptions options) const |
| { |
| Data *x = Data::allocate(d->detachCapacity(d->size), options); |
| Q_CHECK_PTR(x); |
| QArrayDataPointer copy(x); |
| |
| if (d->size) |
| copy->copyAppend(d->begin(), d->end()); |
| |
| Data *result = copy.d; |
| copy.d = Data::sharedNull(); |
| return result; |
| } |
| |
| Data *d; |
| }; |
| |
| template <class T> |
| inline bool operator==(const QArrayDataPointer<T> &lhs, const QArrayDataPointer<T> &rhs) |
| { |
| return lhs.data() == rhs.data(); |
| } |
| |
| template <class T> |
| inline bool operator!=(const QArrayDataPointer<T> &lhs, const QArrayDataPointer<T> &rhs) |
| { |
| return lhs.data() != rhs.data(); |
| } |
| |
| template <class T> |
| inline void swap(QArrayDataPointer<T> &p1, QArrayDataPointer<T> &p2) |
| { |
| p1.swap(p2); |
| } |
| |
| QT_END_NAMESPACE |
| |
| #endif // include guard |