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| ****************************************************************************/ |
| |
| #ifndef QSHAREDDATA_H |
| #define QSHAREDDATA_H |
| |
| #include <QtCore/qglobal.h> |
| #include <QtCore/qatomic.h> |
| #if QT_DEPRECATED_SINCE(5, 6) |
| #include <QtCore/qhash.h> |
| #endif |
| #include <QtCore/qhashfunctions.h> |
| |
| QT_BEGIN_NAMESPACE |
| |
| |
| template <class T> class QSharedDataPointer; |
| |
| class |
| #if QT_VERSION < QT_VERSION_CHECK(6, 0, 0) |
| Q_CORE_EXPORT |
| #endif |
| QSharedData |
| { |
| public: |
| mutable QAtomicInt ref; |
| |
| inline QSharedData() noexcept : ref(0) { } |
| inline QSharedData(const QSharedData &) noexcept : ref(0) { } |
| |
| // using the assignment operator would lead to corruption in the ref-counting |
| QSharedData &operator=(const QSharedData &) = delete; |
| ~QSharedData() = default; |
| }; |
| |
| template <class T> class QSharedDataPointer |
| { |
| public: |
| typedef T Type; |
| typedef T *pointer; |
| |
| inline void detach() { if (d && d->ref.loadRelaxed() != 1) detach_helper(); } |
| inline T &operator*() { detach(); return *d; } |
| inline const T &operator*() const { return *d; } |
| inline T *operator->() { detach(); return d; } |
| inline const T *operator->() const { return d; } |
| inline operator T *() { detach(); return d; } |
| inline operator const T *() const { return d; } |
| inline T *data() { detach(); return d; } |
| inline const T *data() const { return d; } |
| inline const T *constData() const { return d; } |
| |
| inline bool operator==(const QSharedDataPointer<T> &other) const { return d == other.d; } |
| inline bool operator!=(const QSharedDataPointer<T> &other) const { return d != other.d; } |
| |
| inline QSharedDataPointer() { d = nullptr; } |
| inline ~QSharedDataPointer() { if (d && !d->ref.deref()) delete d; } |
| |
| explicit QSharedDataPointer(T *data) noexcept; |
| inline QSharedDataPointer(const QSharedDataPointer<T> &o) : d(o.d) { if (d) d->ref.ref(); } |
| inline QSharedDataPointer<T> & operator=(const QSharedDataPointer<T> &o) { |
| if (o.d != d) { |
| if (o.d) |
| o.d->ref.ref(); |
| T *old = d; |
| d = o.d; |
| if (old && !old->ref.deref()) |
| delete old; |
| } |
| return *this; |
| } |
| inline QSharedDataPointer &operator=(T *o) { |
| if (o != d) { |
| if (o) |
| o->ref.ref(); |
| T *old = d; |
| d = o; |
| if (old && !old->ref.deref()) |
| delete old; |
| } |
| return *this; |
| } |
| QSharedDataPointer(QSharedDataPointer &&o) noexcept : d(o.d) { o.d = nullptr; } |
| inline QSharedDataPointer<T> &operator=(QSharedDataPointer<T> &&other) noexcept |
| { |
| QSharedDataPointer moved(std::move(other)); |
| swap(moved); |
| return *this; |
| } |
| |
| inline bool operator!() const { return !d; } |
| |
| inline void swap(QSharedDataPointer &other) noexcept |
| { qSwap(d, other.d); } |
| |
| protected: |
| T *clone(); |
| |
| private: |
| void detach_helper(); |
| |
| T *d; |
| }; |
| |
| template <class T> inline bool operator==(std::nullptr_t p1, const QSharedDataPointer<T> &p2) |
| { |
| Q_UNUSED(p1); |
| return !p2; |
| } |
| |
| template <class T> inline bool operator==(const QSharedDataPointer<T> &p1, std::nullptr_t p2) |
| { |
| Q_UNUSED(p2); |
| return !p1; |
| } |
| |
| template <class T> class QExplicitlySharedDataPointer |
| { |
| public: |
| typedef T Type; |
| typedef T *pointer; |
| |
| inline T &operator*() const { return *d; } |
| inline T *operator->() { return d; } |
| inline T *operator->() const { return d; } |
| inline T *data() const { return d; } |
| inline const T *constData() const { return d; } |
| inline T *take() { T *x = d; d = nullptr; return x; } |
| |
| inline void detach() { if (d && d->ref.loadRelaxed() != 1) detach_helper(); } |
| |
| inline void reset() |
| { |
| if(d && !d->ref.deref()) |
| delete d; |
| |
| d = nullptr; |
| } |
| |
| inline operator bool () const { return d != nullptr; } |
| |
| inline bool operator==(const QExplicitlySharedDataPointer<T> &other) const { return d == other.d; } |
| inline bool operator!=(const QExplicitlySharedDataPointer<T> &other) const { return d != other.d; } |
| inline bool operator==(const T *ptr) const { return d == ptr; } |
| inline bool operator!=(const T *ptr) const { return d != ptr; } |
| |
| inline QExplicitlySharedDataPointer() { d = nullptr; } |
| inline ~QExplicitlySharedDataPointer() { if (d && !d->ref.deref()) delete d; } |
| |
| explicit QExplicitlySharedDataPointer(T *data) noexcept; |
| inline QExplicitlySharedDataPointer(const QExplicitlySharedDataPointer<T> &o) : d(o.d) { if (d) d->ref.ref(); } |
| |
| template<class X> |
| inline QExplicitlySharedDataPointer(const QExplicitlySharedDataPointer<X> &o) |
| #ifdef QT_ENABLE_QEXPLICITLYSHAREDDATAPOINTER_STATICCAST |
| : d(static_cast<T *>(o.data())) |
| #else |
| : d(o.data()) |
| #endif |
| { |
| if(d) |
| d->ref.ref(); |
| } |
| |
| inline QExplicitlySharedDataPointer<T> & operator=(const QExplicitlySharedDataPointer<T> &o) { |
| if (o.d != d) { |
| if (o.d) |
| o.d->ref.ref(); |
| T *old = d; |
| d = o.d; |
| if (old && !old->ref.deref()) |
| delete old; |
| } |
| return *this; |
| } |
| inline QExplicitlySharedDataPointer &operator=(T *o) { |
| if (o != d) { |
| if (o) |
| o->ref.ref(); |
| T *old = d; |
| d = o; |
| if (old && !old->ref.deref()) |
| delete old; |
| } |
| return *this; |
| } |
| inline QExplicitlySharedDataPointer(QExplicitlySharedDataPointer &&o) noexcept : d(o.d) { o.d = nullptr; } |
| inline QExplicitlySharedDataPointer<T> &operator=(QExplicitlySharedDataPointer<T> &&other) noexcept |
| { |
| QExplicitlySharedDataPointer moved(std::move(other)); |
| swap(moved); |
| return *this; |
| } |
| |
| inline bool operator!() const { return !d; } |
| |
| inline void swap(QExplicitlySharedDataPointer &other) noexcept |
| { qSwap(d, other.d); } |
| |
| protected: |
| T *clone(); |
| |
| private: |
| void detach_helper(); |
| |
| T *d; |
| }; |
| |
| template <class T> |
| Q_INLINE_TEMPLATE QSharedDataPointer<T>::QSharedDataPointer(T *adata) noexcept |
| : d(adata) |
| { if (d) d->ref.ref(); } |
| |
| template <class T> |
| Q_INLINE_TEMPLATE T *QSharedDataPointer<T>::clone() |
| { |
| return new T(*d); |
| } |
| |
| template <class T> |
| Q_OUTOFLINE_TEMPLATE void QSharedDataPointer<T>::detach_helper() |
| { |
| T *x = clone(); |
| x->ref.ref(); |
| if (!d->ref.deref()) |
| delete d; |
| d = x; |
| } |
| |
| template <class T> |
| Q_INLINE_TEMPLATE T *QExplicitlySharedDataPointer<T>::clone() |
| { |
| return new T(*d); |
| } |
| |
| template <class T> |
| Q_OUTOFLINE_TEMPLATE void QExplicitlySharedDataPointer<T>::detach_helper() |
| { |
| T *x = clone(); |
| x->ref.ref(); |
| if (!d->ref.deref()) |
| delete d; |
| d = x; |
| } |
| |
| template <class T> |
| Q_INLINE_TEMPLATE QExplicitlySharedDataPointer<T>::QExplicitlySharedDataPointer(T *adata) noexcept |
| : d(adata) |
| { if (d) d->ref.ref(); } |
| |
| template <class T> inline bool operator==(std::nullptr_t p1, const QExplicitlySharedDataPointer<T> &p2) |
| { |
| Q_UNUSED(p1); |
| return !p2; |
| } |
| |
| template <class T> inline bool operator==(const QExplicitlySharedDataPointer<T> &p1, std::nullptr_t p2) |
| { |
| Q_UNUSED(p2); |
| return !p1; |
| } |
| |
| template <class T> |
| Q_INLINE_TEMPLATE void swap(QSharedDataPointer<T> &p1, QSharedDataPointer<T> &p2) |
| { p1.swap(p2); } |
| |
| template <class T> |
| Q_INLINE_TEMPLATE void swap(QExplicitlySharedDataPointer<T> &p1, QExplicitlySharedDataPointer<T> &p2) |
| { p1.swap(p2); } |
| |
| template <class T> |
| Q_INLINE_TEMPLATE uint qHash(const QSharedDataPointer<T> &ptr, uint seed = 0) noexcept |
| { |
| return qHash(ptr.data(), seed); |
| } |
| template <class T> |
| Q_INLINE_TEMPLATE uint qHash(const QExplicitlySharedDataPointer<T> &ptr, uint seed = 0) noexcept |
| { |
| return qHash(ptr.data(), seed); |
| } |
| |
| template<typename T> Q_DECLARE_TYPEINFO_BODY(QSharedDataPointer<T>, Q_MOVABLE_TYPE); |
| template<typename T> Q_DECLARE_TYPEINFO_BODY(QExplicitlySharedDataPointer<T>, Q_MOVABLE_TYPE); |
| |
| QT_END_NAMESPACE |
| |
| #endif // QSHAREDDATA_H |
