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// Copyright (C) 2020 Klarälvdalens Datakonsult AB, a KDAB Group company, info@kdab.com, author Giuseppe D'Angelo <giuseppe.dangelo@kdab.com>
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#if 0
#pragma qt_sync_skip_header_check
#pragma qt_sync_stop_processing
#endif
#ifndef QSHAREDDATA_IMPL_H
#define QSHAREDDATA_IMPL_H
#include <QtCore/qglobal.h>
#include <QtCore/qshareddata.h>
QT_BEGIN_NAMESPACE
namespace QtPrivate {
template <typename T>
class QExplicitlySharedDataPointerV2
{
T *d;
public:
constexpr QExplicitlySharedDataPointerV2() noexcept : d(nullptr) {}
explicit QExplicitlySharedDataPointerV2(T *t) noexcept
: d(t)
{
if (d)
d->ref.ref();
}
QExplicitlySharedDataPointerV2(T *t, QAdoptSharedDataTag) noexcept
: d(t)
{
}
QExplicitlySharedDataPointerV2(const QExplicitlySharedDataPointerV2 &other) noexcept
: d(other.d)
{
if (d)
d->ref.ref();
}
QExplicitlySharedDataPointerV2 &operator=(const QExplicitlySharedDataPointerV2 &other) noexcept
{
QExplicitlySharedDataPointerV2 copy(other);
swap(copy);
return *this;
}
QExplicitlySharedDataPointerV2(QExplicitlySharedDataPointerV2 &&other) noexcept
: d(qExchange(other.d, nullptr))
{
}
QExplicitlySharedDataPointerV2 &operator=(QExplicitlySharedDataPointerV2 &&other) noexcept
{
QExplicitlySharedDataPointerV2 moved(std::move(other));
swap(moved);
return *this;
}
~QExplicitlySharedDataPointerV2()
{
if (d && !d->ref.deref())
delete d;
}
void detach()
{
if (!d) {
// should this codepath be here on in all user's detach()?
d = new T;
d->ref.ref();
} else if (d->ref.loadRelaxed() != 1) {
// TODO: qAtomicDetach here...?
QExplicitlySharedDataPointerV2 copy(new T(*d));
swap(copy);
}
}
void reset(T *t = nullptr) noexcept
{
if (d && !d->ref.deref())
delete d;
d = t;
if (d)
d->ref.ref();
}
constexpr T *take() noexcept
{
return qExchange(d, nullptr);
}
bool isShared() const noexcept
{
return d && d->ref.loadRelaxed() != 1;
}
constexpr void swap(QExplicitlySharedDataPointerV2 &other) noexcept
{
qt_ptr_swap(d, other.d);
}
// important change from QExplicitlySharedDataPointer: deep const
constexpr T &operator*() { return *d; }
constexpr T *operator->() { return d; }
constexpr const T &operator*() const { return *d; }
constexpr const T *operator->() const { return d; }
constexpr T *data() noexcept { return d; }
constexpr const T *data() const noexcept { return d; }
constexpr explicit operator bool() const noexcept { return d; }
constexpr friend bool operator==(const QExplicitlySharedDataPointerV2 &lhs,
const QExplicitlySharedDataPointerV2 &rhs) noexcept
{
return lhs.d == rhs.d;
}
constexpr friend bool operator!=(const QExplicitlySharedDataPointerV2 &lhs,
const QExplicitlySharedDataPointerV2 &rhs) noexcept
{
return lhs.d != rhs.d;
}
};
template <typename T>
constexpr void swap(QExplicitlySharedDataPointerV2<T> &lhs, QExplicitlySharedDataPointerV2<T> &rhs) noexcept
{
lhs.swap(rhs);
}
} // namespace QtPrivate
QT_END_NAMESPACE
#endif // QSHAREDDATA_IMPL_H
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