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-rw-r--r--src/corelib/kernel/qpointer.h160
1 files changed, 69 insertions, 91 deletions
diff --git a/src/corelib/kernel/qpointer.h b/src/corelib/kernel/qpointer.h
index ebc06a0fb1..39e4ba3e0f 100644
--- a/src/corelib/kernel/qpointer.h
+++ b/src/corelib/kernel/qpointer.h
@@ -1,41 +1,5 @@
-/****************************************************************************
-**
-** 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) 2016 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 QPOINTER_H
#define QPOINTER_H
@@ -54,15 +18,48 @@ class QPointer
{
static_assert(!std::is_pointer<T>::value, "QPointer's template type must not be a pointer type");
+ template <typename X>
+ using if_convertible = std::enable_if_t<std::is_convertible_v<X*, T*>, bool>;
+ template <typename X>
+ friend class QPointer;
+
using QObjectType =
typename std::conditional<std::is_const<T>::value, const QObject, QObject>::type;
QWeakPointer<QObjectType> wp;
public:
- QPointer() = default;
+ Q_NODISCARD_CTOR
+ QPointer() noexcept = default;
+ Q_NODISCARD_CTOR
+ constexpr QPointer(std::nullptr_t) noexcept : QPointer{} {}
+ Q_WEAK_OVERLOAD
+ Q_NODISCARD_CTOR
inline QPointer(T *p) : wp(p, true) { }
// compiler-generated copy/move ctor/assignment operators are fine!
// compiler-generated dtor is fine!
+ template <typename X, if_convertible<X> = true>
+ Q_NODISCARD_CTOR
+ QPointer(QPointer<X> &&other) noexcept
+ : wp(std::exchange(other.wp, nullptr).internalData(), true) {}
+ template <typename X, if_convertible<X> = true>
+ Q_NODISCARD_CTOR
+ QPointer(const QPointer<X> &other) noexcept
+ : wp(other.wp.internalData(), true) {}
+
+ template <typename X, if_convertible<X> = true>
+ QPointer &operator=(const QPointer<X> &other) noexcept
+ {
+ QPointer(other).swap(*this);
+ return *this;
+ }
+
+ template <typename X, if_convertible<X> = true>
+ QPointer &operator=(QPointer<X> &&other) noexcept
+ {
+ QPointer(std::move(other)).swap(*this);
+ return *this;
+ }
+
#ifdef Q_QDOC
// Stop qdoc from complaining about missing function
~QPointer();
@@ -73,64 +70,49 @@ public:
inline QPointer<T> &operator=(T* p)
{ wp.assign(static_cast<QObjectType*>(p)); return *this; }
- inline T* data() const
+ T* data() const noexcept
{ return static_cast<T*>(wp.internalData()); }
- inline T* get() const
+ T* get() const noexcept
{ return data(); }
- inline T* operator->() const
+ T* operator->() const noexcept
{ return data(); }
- inline T& operator*() const
+ T& operator*() const noexcept
{ return *data(); }
- inline operator T*() const
+ operator T*() const noexcept
{ return data(); }
- inline bool isNull() const
+ bool isNull() const noexcept
{ return wp.isNull(); }
- inline void clear()
+ void clear() noexcept
{ wp.clear(); }
-};
-template <class T> Q_DECLARE_TYPEINFO_BODY(QPointer<T>, Q_MOVABLE_TYPE);
-
-template <class T>
-inline bool operator==(const T *o, const QPointer<T> &p)
-{ return o == p.operator->(); }
-
-template<class T>
-inline bool operator==(const QPointer<T> &p, const T *o)
-{ return p.operator->() == o; }
-
-template <class T>
-inline bool operator==(T *o, const QPointer<T> &p)
-{ return o == p.operator->(); }
-
-template<class T>
-inline bool operator==(const QPointer<T> &p, T *o)
-{ return p.operator->() == o; }
-
-template<class T>
-inline bool operator==(const QPointer<T> &p1, const QPointer<T> &p2)
-{ return p1.operator->() == p2.operator->(); }
-template <class T>
-inline bool operator!=(const T *o, const QPointer<T> &p)
-{ return o != p.operator->(); }
-
-template<class T>
-inline bool operator!= (const QPointer<T> &p, const T *o)
-{ return p.operator->() != o; }
-
-template <class T>
-inline bool operator!=(T *o, const QPointer<T> &p)
-{ return o != p.operator->(); }
-
-template<class T>
-inline bool operator!= (const QPointer<T> &p, T *o)
-{ return p.operator->() != o; }
-
-template<class T>
-inline bool operator!= (const QPointer<T> &p1, const QPointer<T> &p2)
-{ return p1.operator->() != p2.operator->() ; }
+ friend void swap(QPointer &lhs, QPointer &rhs) noexcept
+ { lhs.swap(rhs); }
+
+#define DECLARE_COMPARE_SET(T1, A1, T2, A2) \
+ friend bool operator==(T1, T2) noexcept \
+ { return A1 == A2; } \
+ friend bool operator!=(T1, T2) noexcept \
+ { return A1 != A2; }
+
+#define DECLARE_TEMPLATE_COMPARE_SET(T1, A1, T2, A2) \
+ template <typename X> \
+ friend bool operator==(T1, T2) noexcept \
+ { return A1 == A2; } \
+ template <typename X> \
+ friend bool operator!=(T1, T2) noexcept \
+ { return A1 != A2; }
+
+ DECLARE_TEMPLATE_COMPARE_SET(const QPointer &p1, p1.data(), const QPointer<X> &p2, p2.data())
+ DECLARE_TEMPLATE_COMPARE_SET(const QPointer &p1, p1.data(), X *ptr, ptr)
+ DECLARE_TEMPLATE_COMPARE_SET(X *ptr, ptr, const QPointer &p2, p2.data())
+ DECLARE_COMPARE_SET(const QPointer &p1, p1.data(), std::nullptr_t, nullptr)
+ DECLARE_COMPARE_SET(std::nullptr_t, nullptr, const QPointer &p2, p2.data())
+#undef DECLARE_COMPARE_SET
+#undef DECLARE_TEMPLATE_COMPARE_SET
+};
+template <class T> Q_DECLARE_TYPEINFO_BODY(QPointer<T>, Q_RELOCATABLE_TYPE);
template<typename T>
QPointer<T>
@@ -140,10 +122,6 @@ qPointerFromVariant(const QVariant &variant)
return QPointer<T>{qobject_cast<T*>(QtPrivate::EnableInternalData::internalData(wp))};
}
-template <class T>
-inline void swap(QPointer<T> &p1, QPointer<T> &p2) noexcept
-{ p1.swap(p2); }
-
QT_END_NAMESPACE
#endif // QT_NO_QOBJECT
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