diff options
Diffstat (limited to 'src/corelib/tools/qshareddata.h')
| -rw-r--r-- | src/corelib/tools/qshareddata.h | 378 |
1 files changed, 179 insertions, 199 deletions
diff --git a/src/corelib/tools/qshareddata.h b/src/corelib/tools/qshareddata.h index 088e9a2d37..4c4153a506 100644 --- a/src/corelib/tools/qshareddata.h +++ b/src/corelib/tools/qshareddata.h @@ -1,52 +1,15 @@ -/**************************************************************************** -** -** Copyright (C) 2016 The Qt Company Ltd. -** Contact: https://www.qt.io/licensing/ -** -** This file is part of the QtCore module of the Qt Toolkit. -** -** $QT_BEGIN_LICENSE:LGPL$ -** Commercial License Usage -** Licensees holding valid commercial Qt licenses may use this file in -** accordance with the commercial license agreement provided with the -** Software or, alternatively, in accordance with the terms contained in -** a written agreement between you and The Qt Company. For licensing terms -** and conditions see https://www.qt.io/terms-conditions. For further -** information use the contact form at https://www.qt.io/contact-us. -** -** GNU Lesser General Public License Usage -** Alternatively, this file may be used under the terms of the GNU Lesser -** General Public License version 3 as published by the Free Software -** Foundation and appearing in the file LICENSE.LGPL3 included in the -** packaging of this file. Please review the following information to -** ensure the GNU Lesser General Public License version 3 requirements -** will be met: https://www.gnu.org/licenses/lgpl-3.0.html. -** -** GNU General Public License Usage -** Alternatively, this file may be used under the terms of the GNU -** General Public License version 2.0 or (at your option) the GNU General -** Public license version 3 or any later version approved by the KDE Free -** Qt Foundation. The licenses are as published by the Free Software -** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3 -** included in the packaging of this file. Please review the following -** information to ensure the GNU General Public License requirements will -** be met: https://www.gnu.org/licenses/gpl-2.0.html and -** https://www.gnu.org/licenses/gpl-3.0.html. -** -** $QT_END_LICENSE$ -** -****************************************************************************/ +// Copyright (C) 2020 The Qt Company Ltd. +// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only #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> +#include <functional> + QT_BEGIN_NAMESPACE @@ -57,75 +20,101 @@ class QSharedData public: mutable QAtomicInt ref; - inline QSharedData() noexcept : ref(0) { } - inline QSharedData(const QSharedData &) noexcept : ref(0) { } + QSharedData() noexcept : ref(0) { } + 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 +struct QAdoptSharedDataTag { explicit constexpr QAdoptSharedDataTag() = default; }; + +template <typename 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 T *get() { detach(); return d; } - inline const T *data() const { return d; } - inline const T *get() 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; + void detach() { if (d && d->ref.loadRelaxed() != 1) detach_helper(); } + T &operator*() { detach(); return *d; } + const T &operator*() const { return *d; } + T *operator->() { detach(); return d; } + const T *operator->() const noexcept { return d; } + operator T *() { detach(); return d; } + operator const T *() const noexcept { return d; } + T *data() { detach(); return d; } + T *get() { detach(); return d; } + const T *data() const noexcept { return d; } + const T *get() const noexcept { return d; } + const T *constData() const noexcept { return d; } + T *take() noexcept { return std::exchange(d, nullptr); } + + Q_NODISCARD_CTOR + QSharedDataPointer() noexcept : d(nullptr) { } + ~QSharedDataPointer() { if (d && !d->ref.deref()) delete d; } + + Q_NODISCARD_CTOR + explicit QSharedDataPointer(T *data) noexcept : d(data) + { if (d) d->ref.ref(); } + Q_NODISCARD_CTOR + QSharedDataPointer(T *data, QAdoptSharedDataTag) noexcept : d(data) + {} + Q_NODISCARD_CTOR + QSharedDataPointer(const QSharedDataPointer &o) noexcept : d(o.d) + { if (d) d->ref.ref(); } + + void reset(T *ptr = nullptr) noexcept + { + if (ptr != d) { + if (ptr) + ptr->ref.ref(); + T *old = std::exchange(d, ptr); 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; - } + + QSharedDataPointer &operator=(const QSharedDataPointer &o) noexcept + { + reset(o.d); return *this; } - QSharedDataPointer(QSharedDataPointer &&o) noexcept : d(o.d) { o.d = nullptr; } - inline QSharedDataPointer<T> &operator=(QSharedDataPointer<T> &&other) noexcept + inline QSharedDataPointer &operator=(T *o) noexcept { - QSharedDataPointer moved(std::move(other)); - swap(moved); + reset(o); return *this; } - - inline bool operator!() const { return !d; } - - inline void swap(QSharedDataPointer &other) noexcept - { qSwap(d, other.d); } + Q_NODISCARD_CTOR + QSharedDataPointer(QSharedDataPointer &&o) noexcept : d(std::exchange(o.d, nullptr)) {} + QT_MOVE_ASSIGNMENT_OPERATOR_IMPL_VIA_MOVE_AND_SWAP(QSharedDataPointer) + + operator bool () const noexcept { return d != nullptr; } + bool operator!() const noexcept { return d == nullptr; } + + void swap(QSharedDataPointer &other) noexcept + { qt_ptr_swap(d, other.d); } + +#define DECLARE_COMPARE_SET(T1, A1, T2, A2) \ + friend bool operator<(T1, T2) noexcept \ + { return std::less<T*>{}(A1, A2); } \ + friend bool operator<=(T1, T2) noexcept \ + { return !std::less<T*>{}(A2, A1); } \ + friend bool operator>(T1, T2) noexcept \ + { return std::less<T*>{}(A2, A1); } \ + friend bool operator>=(T1, T2) noexcept \ + { return !std::less<T*>{}(A1, A2); } \ + friend bool operator==(T1, T2) noexcept \ + { return A1 == A2; } \ + friend bool operator!=(T1, T2) noexcept \ + { return A1 != A2; } \ + + DECLARE_COMPARE_SET(const QSharedDataPointer &p1, p1.d, const QSharedDataPointer &p2, p2.d) + DECLARE_COMPARE_SET(const QSharedDataPointer &p1, p1.d, const T *ptr, ptr) + DECLARE_COMPARE_SET(const T *ptr, ptr, const QSharedDataPointer &p2, p2.d) + DECLARE_COMPARE_SET(const QSharedDataPointer &p1, p1.d, std::nullptr_t, nullptr) + DECLARE_COMPARE_SET(std::nullptr_t, nullptr, const QSharedDataPointer &p2, p2.d) protected: T *clone(); @@ -136,101 +125,87 @@ private: 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 +template <typename 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 T *get() 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) + T &operator*() const { return *d; } + T *operator->() noexcept { return d; } + T *operator->() const noexcept { return d; } + explicit operator T *() { return d; } + explicit operator const T *() const noexcept { return d; } + T *data() const noexcept { return d; } + T *get() const noexcept { return d; } + const T *constData() const noexcept { return d; } + T *take() noexcept { return std::exchange(d, nullptr); } + + void detach() { if (d && d->ref.loadRelaxed() != 1) detach_helper(); } + + Q_NODISCARD_CTOR + QExplicitlySharedDataPointer() noexcept : d(nullptr) { } + ~QExplicitlySharedDataPointer() { if (d && !d->ref.deref()) delete d; } + + Q_NODISCARD_CTOR + explicit QExplicitlySharedDataPointer(T *data) noexcept : d(data) + { if (d) d->ref.ref(); } + Q_NODISCARD_CTOR + QExplicitlySharedDataPointer(T *data, QAdoptSharedDataTag) noexcept : d(data) + {} + Q_NODISCARD_CTOR + QExplicitlySharedDataPointer(const QExplicitlySharedDataPointer &o) noexcept : d(o.d) + { if (d) d->ref.ref(); } + + template<typename X> + Q_NODISCARD_CTOR + QExplicitlySharedDataPointer(const QExplicitlySharedDataPointer<X> &o) noexcept #ifdef QT_ENABLE_QEXPLICITLYSHAREDDATAPOINTER_STATICCAST : d(static_cast<T *>(o.data())) #else : d(o.data()) #endif - { - if(d) - d->ref.ref(); - } + { 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; + void reset(T *ptr = nullptr) noexcept + { + if (ptr != d) { + if (ptr) + ptr->ref.ref(); + T *old = std::exchange(d, ptr); 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; - } + + QExplicitlySharedDataPointer &operator=(const QExplicitlySharedDataPointer &o) noexcept + { + reset(o.d); return *this; } - inline QExplicitlySharedDataPointer(QExplicitlySharedDataPointer &&o) noexcept : d(o.d) { o.d = nullptr; } - inline QExplicitlySharedDataPointer<T> &operator=(QExplicitlySharedDataPointer<T> &&other) noexcept + QExplicitlySharedDataPointer &operator=(T *o) noexcept { - QExplicitlySharedDataPointer moved(std::move(other)); - swap(moved); + reset(o); return *this; } + Q_NODISCARD_CTOR + QExplicitlySharedDataPointer(QExplicitlySharedDataPointer &&o) noexcept : d(std::exchange(o.d, nullptr)) {} + QT_MOVE_ASSIGNMENT_OPERATOR_IMPL_VIA_MOVE_AND_SWAP(QExplicitlySharedDataPointer) + + operator bool () const noexcept { return d != nullptr; } + bool operator!() const noexcept { return d == nullptr; } + + void swap(QExplicitlySharedDataPointer &other) noexcept + { qt_ptr_swap(d, other.d); } - inline bool operator!() const { return !d; } + DECLARE_COMPARE_SET(const QExplicitlySharedDataPointer &p1, p1.d, const QExplicitlySharedDataPointer &p2, p2.d) + DECLARE_COMPARE_SET(const QExplicitlySharedDataPointer &p1, p1.d, const T *ptr, ptr) + DECLARE_COMPARE_SET(const T *ptr, ptr, const QExplicitlySharedDataPointer &p2, p2.d) + DECLARE_COMPARE_SET(const QExplicitlySharedDataPointer &p1, p1.d, std::nullptr_t, nullptr) + DECLARE_COMPARE_SET(std::nullptr_t, nullptr, const QExplicitlySharedDataPointer &p2, p2.d) - inline void swap(QExplicitlySharedDataPointer &other) noexcept - { qSwap(d, other.d); } +#undef DECLARE_COMPARE_SET protected: T *clone(); @@ -241,18 +216,14 @@ private: T *d; }; -template <class T> -Q_INLINE_TEMPLATE QSharedDataPointer<T>::QSharedDataPointer(T *adata) noexcept - : d(adata) -{ if (d) d->ref.ref(); } - -template <class T> +// Declared here and as Q_OUTOFLINE_TEMPLATE to work-around MSVC bug causing missing symbols at link time. +template <typename T> Q_INLINE_TEMPLATE T *QSharedDataPointer<T>::clone() { return new T(*d); } -template <class T> +template <typename T> Q_OUTOFLINE_TEMPLATE void QSharedDataPointer<T>::detach_helper() { T *x = clone(); @@ -262,13 +233,13 @@ Q_OUTOFLINE_TEMPLATE void QSharedDataPointer<T>::detach_helper() d = x; } -template <class T> +template <typename T> Q_INLINE_TEMPLATE T *QExplicitlySharedDataPointer<T>::clone() { return new T(*d); } -template <class T> +template <typename T> Q_OUTOFLINE_TEMPLATE void QExplicitlySharedDataPointer<T>::detach_helper() { T *x = clone(); @@ -278,44 +249,53 @@ Q_OUTOFLINE_TEMPLATE void QExplicitlySharedDataPointer<T>::detach_helper() 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) +template <typename T> +void swap(QSharedDataPointer<T> &p1, QSharedDataPointer<T> &p2) noexcept { p1.swap(p2); } -template <class T> -Q_INLINE_TEMPLATE void swap(QExplicitlySharedDataPointer<T> &p1, QExplicitlySharedDataPointer<T> &p2) +template <typename T> +void swap(QExplicitlySharedDataPointer<T> &p1, QExplicitlySharedDataPointer<T> &p2) noexcept { p1.swap(p2); } -template <class T> -Q_INLINE_TEMPLATE size_t qHash(const QSharedDataPointer<T> &ptr, size_t seed = 0) noexcept +template <typename T> +size_t qHash(const QSharedDataPointer<T> &ptr, size_t seed = 0) noexcept { return qHash(ptr.data(), seed); } -template <class T> -Q_INLINE_TEMPLATE size_t qHash(const QExplicitlySharedDataPointer<T> &ptr, size_t seed = 0) noexcept +template <typename T> +size_t qHash(const QExplicitlySharedDataPointer<T> &ptr, size_t 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); +template<typename T> Q_DECLARE_TYPEINFO_BODY(QSharedDataPointer<T>, Q_RELOCATABLE_TYPE); +template<typename T> Q_DECLARE_TYPEINFO_BODY(QExplicitlySharedDataPointer<T>, Q_RELOCATABLE_TYPE); + +#define QT_DECLARE_QSDP_SPECIALIZATION_DTOR(Class) \ + template<> QSharedDataPointer<Class>::~QSharedDataPointer(); + +#define QT_DECLARE_QSDP_SPECIALIZATION_DTOR_WITH_EXPORT(Class, ExportMacro) \ + template<> ExportMacro QSharedDataPointer<Class>::~QSharedDataPointer(); + +#define QT_DEFINE_QSDP_SPECIALIZATION_DTOR(Class) \ + template<> QSharedDataPointer<Class>::~QSharedDataPointer() \ + { \ + if (d && !d->ref.deref()) \ + delete d; \ + } + +#define QT_DECLARE_QESDP_SPECIALIZATION_DTOR(Class) \ + template<> QExplicitlySharedDataPointer<Class>::~QExplicitlySharedDataPointer(); + +#define QT_DECLARE_QESDP_SPECIALIZATION_DTOR_WITH_EXPORT(Class, ExportMacro) \ + template<> ExportMacro QExplicitlySharedDataPointer<Class>::~QExplicitlySharedDataPointer(); + +#define QT_DEFINE_QESDP_SPECIALIZATION_DTOR(Class) \ + template<> QExplicitlySharedDataPointer<Class>::~QExplicitlySharedDataPointer() \ + { \ + if (d && !d->ref.deref()) \ + delete d; \ + } QT_END_NAMESPACE |