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/****************************************************************************
**
** Copyright (C) 2019 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtBluetooth 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.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef BTRAII_P_H
#define BTRAII_P_H
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists purely as an
// implementation detail. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
#include <QtCore/qglobal.h>
#include <utility>
QT_BEGIN_NAMESPACE
namespace DarwinBluetooth {
enum class RetainPolicy
{
noInitialRetain,
doInitialRetain
};
// The class StrongReference and its descendant ScopedGuard
// are RAII classes dealing with raw pointers to NSObject class
// and its descendants (and thus hiding Objective-C's retain/
// release semantics). The header itself is meant to be included
// into *.cpp files so it's a pure C++ code without any Objective-C
// syntax. Thus it's a bit clunky - the type information is 'erased'
// and has to be enforced by the code using these smart pointers.
// That's because these types are Objective-C classes - thus require
// Objective-C compiler to work. Member-function template 'getAs' is
// a convenience shortcut giving the desired pointer type in
// Objective-C++ files (*.mm).
// TODO: on top of these classes I can build ObjCStrongReference (it's
// now inside osxbtutils_p.h, a template class that does have type
// information needed but works only in Objective-C++ environment.
class StrongReference
{
public:
StrongReference() = default;
StrongReference(void *object, RetainPolicy policy);
StrongReference(const StrongReference &other);
StrongReference(StrongReference &&other);
~StrongReference();
StrongReference &operator = (const StrongReference &other) noexcept;
StrongReference &operator = (StrongReference &&other) noexcept;
void swap(StrongReference &other) noexcept
{
std::swap(objCInstance, other.objCInstance);
}
void reset();
void reset(void *newInstance, RetainPolicy policy);
template<class ObjCType>
ObjCType *getAs() const
{
return static_cast<ObjCType *>(objCInstance);
}
operator bool() const
{
return !!objCInstance;
}
private:
void *objCInstance = nullptr;
};
class ScopedPointer final : public StrongReference
{
public:
ScopedPointer() = default;
ScopedPointer(void *instance, RetainPolicy policy)
: StrongReference(instance, policy)
{
}
private:
Q_DISABLE_COPY_MOVE(ScopedPointer)
};
} // namespace DarwinBluetooth
QT_END_NAMESPACE
#endif // BTRAII_P_H
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