| /**************************************************************************** |
| ** |
| ** 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 |
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| ** GNU Lesser General Public License Usage |
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| ** General Public License version 3 as published by the Free Software |
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| ** packaging of this file. Please review the following information to |
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| ** |
| ** 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 |
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| ****************************************************************************/ |
| |
| #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 |