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/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of Qbs.
**
** $QT_BEGIN_LICENSE:LGPL$
** 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.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QBS_WEAKPOINTER_H
#define QBS_WEAKPOINTER_H
#include <memory>
namespace qbs {
namespace Internal {
template<typename T> class WeakPointer : public std::weak_ptr<T>
{
public:
WeakPointer() : std::weak_ptr<T>() {}
WeakPointer(const std::shared_ptr<T> &sharedPointer) : std::weak_ptr<T>(sharedPointer) {}
template <class X> WeakPointer(const std::shared_ptr<X> &sp) : std::weak_ptr<T>(sp) { }
T *get() const { auto p = std::weak_ptr<T>::lock(); return p.get(); }
operator bool() const { return !std::weak_ptr<T>::expired(); }
bool operator!() const { return std::weak_ptr<T>::expired(); }
operator T*() const { return checkedData(); }
T *operator->() const { return checkedData(); }
T operator*() const { return *checkedData(); }
private:
T *checkedData() const {
T * const d = get();
Q_ASSERT(d); // Calling code is not expecting this situation.
return d;
}
};
template <typename T> bool operator==(const WeakPointer<T> &a, const WeakPointer<T> &b)
{
return a.get() == b.get();
}
template <typename T> bool operator!=(const WeakPointer<T> &a, const WeakPointer<T> &b)
{
return a.get() != b.get();
}
template <typename T, typename V> bool operator==(const WeakPointer<T> &a,
const std::shared_ptr<V> &b)
{
return a.lock() == b;
}
template <typename T, typename V> bool operator!=(const WeakPointer<T> &a,
const std::shared_ptr<V> &b)
{
return a.lock() != b;
}
} // namespace Internal
} // namespace qbs
#endif // QBS_WEAKPOINTER_H
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