150 lines
4.7 KiB
C++
150 lines
4.7 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2016 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 QPOINTER_H
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#define QPOINTER_H
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#include <QtCore/qsharedpointer.h>
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#include <QtCore/qtypeinfo.h>
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#ifndef QT_NO_QOBJECT
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QT_BEGIN_NAMESPACE
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class QVariant;
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template <class T>
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class QPointer
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{
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Q_STATIC_ASSERT_X(!std::is_pointer<T>::value, "QPointer's template type must not be a pointer type");
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using QObjectType =
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typename std::conditional<std::is_const<T>::value, const QObject, QObject>::type;
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QWeakPointer<QObjectType> wp;
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public:
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QPointer() = default;
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inline QPointer(T *p) : wp(p, true) { }
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// compiler-generated copy/move ctor/assignment operators are fine!
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// compiler-generated dtor is fine!
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#ifdef Q_QDOC
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// Stop qdoc from complaining about missing function
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~QPointer();
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#endif
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inline void swap(QPointer &other) noexcept { wp.swap(other.wp); }
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inline QPointer<T> &operator=(T* p)
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{ wp.assign(static_cast<QObjectType*>(p)); return *this; }
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inline T* data() const
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{ return static_cast<T*>(wp.internalData()); }
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inline T* operator->() const
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{ return data(); }
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inline T& operator*() const
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{ return *data(); }
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inline operator T*() const
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{ return data(); }
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inline bool isNull() const
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{ return wp.isNull(); }
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inline void clear()
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{ wp.clear(); }
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};
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template <class T> Q_DECLARE_TYPEINFO_BODY(QPointer<T>, Q_MOVABLE_TYPE);
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template <class T>
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inline bool operator==(const T *o, const QPointer<T> &p)
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{ return o == p.operator->(); }
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template<class T>
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inline bool operator==(const QPointer<T> &p, const T *o)
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{ return p.operator->() == o; }
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template <class T>
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inline bool operator==(T *o, const QPointer<T> &p)
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{ return o == p.operator->(); }
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template<class T>
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inline bool operator==(const QPointer<T> &p, T *o)
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{ return p.operator->() == o; }
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template<class T>
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inline bool operator==(const QPointer<T> &p1, const QPointer<T> &p2)
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{ return p1.operator->() == p2.operator->(); }
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template <class T>
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inline bool operator!=(const T *o, const QPointer<T> &p)
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{ return o != p.operator->(); }
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template<class T>
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inline bool operator!= (const QPointer<T> &p, const T *o)
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{ return p.operator->() != o; }
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template <class T>
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inline bool operator!=(T *o, const QPointer<T> &p)
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{ return o != p.operator->(); }
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template<class T>
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inline bool operator!= (const QPointer<T> &p, T *o)
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{ return p.operator->() != o; }
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template<class T>
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inline bool operator!= (const QPointer<T> &p1, const QPointer<T> &p2)
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{ return p1.operator->() != p2.operator->() ; }
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template<typename T>
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QPointer<T>
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qPointerFromVariant(const QVariant &variant)
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{
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const auto wp = QtSharedPointer::weakPointerFromVariant_internal(variant);
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return QPointer<T>{qobject_cast<T*>(QtPrivate::EnableInternalData::internalData(wp))};
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}
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template <class T>
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inline void swap(QPointer<T> &p1, QPointer<T> &p2) noexcept
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{ p1.swap(p2); }
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QT_END_NAMESPACE
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#endif // QT_NO_QOBJECT
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#endif // QPOINTER_H
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