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// Copyright (C) 2022 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 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/private/qglobal_p.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).
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 *release();
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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