336 lines
10 KiB
C++
336 lines
10 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2020 The Qt Company Ltd.
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** Contact: https://www.qt.io/licensing/
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**
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** This file is part of the QtCore module of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and The Qt Company. For licensing terms
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** and conditions see https://www.qt.io/terms-conditions. For further
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** information use the contact form at https://www.qt.io/contact-us.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 3 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL3 included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU Lesser General Public License version 3 requirements
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** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
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**
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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU
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** General Public License version 2.0 or (at your option) the GNU General
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** Public license version 3 or any later version approved by the KDE Free
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** Qt Foundation. The licenses are as published by the Free Software
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** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
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** included in the packaging of this file. Please review the following
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** information to ensure the GNU General Public License requirements will
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** be met: https://www.gnu.org/licenses/gpl-2.0.html and
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** https://www.gnu.org/licenses/gpl-3.0.html.
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#ifndef QSHAREDDATA_H
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#define QSHAREDDATA_H
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#include <QtCore/qglobal.h>
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#include <QtCore/qatomic.h>
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#include <QtCore/qhashfunctions.h>
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QT_BEGIN_NAMESPACE
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template <class T> class QSharedDataPointer;
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class QSharedData
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{
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public:
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mutable QAtomicInt ref;
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inline QSharedData() noexcept : ref(0) { }
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inline QSharedData(const QSharedData &) noexcept : ref(0) { }
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// using the assignment operator would lead to corruption in the ref-counting
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QSharedData &operator=(const QSharedData &) = delete;
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~QSharedData() = default;
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};
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template <class T> class QSharedDataPointer
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{
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public:
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typedef T Type;
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typedef T *pointer;
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inline void detach() { if (d && d->ref.loadRelaxed() != 1) detach_helper(); }
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inline T &operator*() { detach(); return *d; }
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inline const T &operator*() const { return *d; }
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inline T *operator->() { detach(); return d; }
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inline const T *operator->() const { return d; }
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inline operator T *() { detach(); return d; }
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inline operator const T *() const { return d; }
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inline T *data() { detach(); return d; }
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inline T *get() { detach(); return d; }
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inline const T *data() const { return d; }
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inline const T *get() const { return d; }
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inline const T *constData() const { return d; }
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inline bool operator==(const QSharedDataPointer<T> &other) const { return d == other.d; }
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inline bool operator!=(const QSharedDataPointer<T> &other) const { return d != other.d; }
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inline QSharedDataPointer() { d = nullptr; }
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inline ~QSharedDataPointer() { if (d && !d->ref.deref()) delete d; }
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explicit QSharedDataPointer(T *data) noexcept;
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inline QSharedDataPointer(const QSharedDataPointer<T> &o) : d(o.d) { if (d) d->ref.ref(); }
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inline QSharedDataPointer<T> & operator=(const QSharedDataPointer<T> &o) {
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if (o.d != d) {
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if (o.d)
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o.d->ref.ref();
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T *old = d;
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d = o.d;
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if (old && !old->ref.deref())
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delete old;
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}
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return *this;
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}
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inline QSharedDataPointer &operator=(T *o) {
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if (o != d) {
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if (o)
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o->ref.ref();
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T *old = d;
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d = o;
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if (old && !old->ref.deref())
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delete old;
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}
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return *this;
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}
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QSharedDataPointer(QSharedDataPointer &&o) noexcept : d(qExchange(o.d, nullptr)) {}
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QT_MOVE_ASSIGNMENT_OPERATOR_IMPL_VIA_MOVE_AND_SWAP(QSharedDataPointer)
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inline bool operator!() const { return !d; }
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inline void swap(QSharedDataPointer &other) noexcept
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{ qSwap(d, other.d); }
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protected:
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T *clone();
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private:
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void detach_helper();
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T *d;
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};
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template <class T> inline bool operator==(std::nullptr_t p1, const QSharedDataPointer<T> &p2)
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{
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Q_UNUSED(p1);
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return !p2;
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}
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template <class T> inline bool operator==(const QSharedDataPointer<T> &p1, std::nullptr_t p2)
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{
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Q_UNUSED(p2);
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return !p1;
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}
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template <class T> class QExplicitlySharedDataPointer
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{
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public:
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typedef T Type;
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typedef T *pointer;
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inline T &operator*() const { return *d; }
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inline T *operator->() { return d; }
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inline T *operator->() const { return d; }
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inline T *data() const { return d; }
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inline T *get() const { return d; }
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inline const T *constData() const { return d; }
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inline T *take() { T *x = d; d = nullptr; return x; }
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inline void detach() { if (d && d->ref.loadRelaxed() != 1) detach_helper(); }
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inline void reset()
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{
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if(d && !d->ref.deref())
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delete d;
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d = nullptr;
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}
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inline operator bool () const { return d != nullptr; }
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inline bool operator==(const QExplicitlySharedDataPointer<T> &other) const { return d == other.d; }
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inline bool operator!=(const QExplicitlySharedDataPointer<T> &other) const { return d != other.d; }
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inline bool operator==(const T *ptr) const { return d == ptr; }
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inline bool operator!=(const T *ptr) const { return d != ptr; }
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inline QExplicitlySharedDataPointer() { d = nullptr; }
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inline ~QExplicitlySharedDataPointer() { if (d && !d->ref.deref()) delete d; }
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explicit QExplicitlySharedDataPointer(T *data) noexcept;
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inline QExplicitlySharedDataPointer(const QExplicitlySharedDataPointer<T> &o) : d(o.d) { if (d) d->ref.ref(); }
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template<class X>
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inline QExplicitlySharedDataPointer(const QExplicitlySharedDataPointer<X> &o)
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#ifdef QT_ENABLE_QEXPLICITLYSHAREDDATAPOINTER_STATICCAST
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: d(static_cast<T *>(o.data()))
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#else
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: d(o.data())
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#endif
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{
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if(d)
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d->ref.ref();
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}
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inline QExplicitlySharedDataPointer<T> & operator=(const QExplicitlySharedDataPointer<T> &o) {
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if (o.d != d) {
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if (o.d)
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o.d->ref.ref();
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T *old = d;
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d = o.d;
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if (old && !old->ref.deref())
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delete old;
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}
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return *this;
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}
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inline QExplicitlySharedDataPointer &operator=(T *o) {
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if (o != d) {
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if (o)
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o->ref.ref();
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T *old = d;
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d = o;
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if (old && !old->ref.deref())
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delete old;
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}
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return *this;
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}
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inline QExplicitlySharedDataPointer(QExplicitlySharedDataPointer &&o) noexcept : d(qExchange(o.d, nullptr)) {}
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QT_MOVE_ASSIGNMENT_OPERATOR_IMPL_VIA_MOVE_AND_SWAP(QExplicitlySharedDataPointer)
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inline bool operator!() const { return !d; }
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inline void swap(QExplicitlySharedDataPointer &other) noexcept
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{ qSwap(d, other.d); }
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protected:
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T *clone();
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private:
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void detach_helper();
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T *d;
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};
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template <class T>
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Q_INLINE_TEMPLATE QSharedDataPointer<T>::QSharedDataPointer(T *adata) noexcept
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: d(adata)
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{ if (d) d->ref.ref(); }
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template <class T>
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Q_INLINE_TEMPLATE T *QSharedDataPointer<T>::clone()
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{
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return new T(*d);
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}
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template <class T>
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Q_OUTOFLINE_TEMPLATE void QSharedDataPointer<T>::detach_helper()
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{
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T *x = clone();
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x->ref.ref();
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if (!d->ref.deref())
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delete d;
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d = x;
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}
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template <class T>
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Q_INLINE_TEMPLATE T *QExplicitlySharedDataPointer<T>::clone()
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{
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return new T(*d);
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}
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template <class T>
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Q_OUTOFLINE_TEMPLATE void QExplicitlySharedDataPointer<T>::detach_helper()
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{
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T *x = clone();
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x->ref.ref();
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if (!d->ref.deref())
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delete d;
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d = x;
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}
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template <class T>
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Q_INLINE_TEMPLATE QExplicitlySharedDataPointer<T>::QExplicitlySharedDataPointer(T *adata) noexcept
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: d(adata)
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{ if (d) d->ref.ref(); }
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template <class T> inline bool operator==(std::nullptr_t p1, const QExplicitlySharedDataPointer<T> &p2)
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{
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Q_UNUSED(p1);
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return !p2;
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}
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template <class T> inline bool operator==(const QExplicitlySharedDataPointer<T> &p1, std::nullptr_t p2)
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{
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Q_UNUSED(p2);
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return !p1;
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}
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template <class T>
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Q_INLINE_TEMPLATE void swap(QSharedDataPointer<T> &p1, QSharedDataPointer<T> &p2)
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{ p1.swap(p2); }
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template <class T>
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Q_INLINE_TEMPLATE void swap(QExplicitlySharedDataPointer<T> &p1, QExplicitlySharedDataPointer<T> &p2)
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{ p1.swap(p2); }
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template <class T>
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Q_INLINE_TEMPLATE size_t qHash(const QSharedDataPointer<T> &ptr, size_t seed = 0) noexcept
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{
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return qHash(ptr.data(), seed);
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}
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template <class T>
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Q_INLINE_TEMPLATE size_t qHash(const QExplicitlySharedDataPointer<T> &ptr, size_t seed = 0) noexcept
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{
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return qHash(ptr.data(), seed);
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}
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template<typename T> Q_DECLARE_TYPEINFO_BODY(QSharedDataPointer<T>, Q_MOVABLE_TYPE);
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template<typename T> Q_DECLARE_TYPEINFO_BODY(QExplicitlySharedDataPointer<T>, Q_MOVABLE_TYPE);
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#define QT_DECLARE_QSDP_SPECIALIZATION_DTOR(Class) \
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template<> QSharedDataPointer<Class>::~QSharedDataPointer();
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#define QT_DECLARE_QSDP_SPECIALIZATION_DTOR_WITH_EXPORT(Class, ExportMacro) \
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template<> ExportMacro QSharedDataPointer<Class>::~QSharedDataPointer();
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#define QT_DEFINE_QSDP_SPECIALIZATION_DTOR(Class) \
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template<> QSharedDataPointer<Class>::~QSharedDataPointer() \
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{ \
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if (d && !d->ref.deref()) \
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delete d; \
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}
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#define QT_DECLARE_QESDP_SPECIALIZATION_DTOR(Class) \
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template<> QExplicitlySharedDataPointer<Class>::~QExplicitlySharedDataPointer();
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#define QT_DECLARE_QESDP_SPECIALIZATION_DTOR_WITH_EXPORT(Class, ExportMacro) \
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template<> ExportMacro QExplicitlySharedDataPointer<Class>::~QExplicitlySharedDataPointer();
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#define QT_DEFINE_QESDP_SPECIALIZATION_DTOR(Class) \
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template<> QExplicitlySharedDataPointer<Class>::~QExplicitlySharedDataPointer() \
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{ \
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if (d && !d->ref.deref()) \
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delete d; \
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}
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QT_END_NAMESPACE
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#endif // QSHAREDDATA_H
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