| 1 | // Copyright (C) 2016 The Qt Company Ltd. |
|---|---|
| 2 | // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only |
| 3 | #ifndef PASSREFPTR_H |
| 4 | #define PASSREFPTR_H |
| 5 | |
| 6 | template <typename T> class RefPtr; |
| 7 | |
| 8 | template <typename T> |
| 9 | class PassRefPtr { |
| 10 | public: |
| 11 | PassRefPtr() : m_ptr(0) {} |
| 12 | |
| 13 | PassRefPtr(T* ptr) |
| 14 | : m_ptr(ptr) |
| 15 | { |
| 16 | if (m_ptr) |
| 17 | m_ptr->ref(); |
| 18 | } |
| 19 | |
| 20 | PassRefPtr(const PassRefPtr<T>& other) |
| 21 | : m_ptr(other.leakRef()) |
| 22 | { |
| 23 | } |
| 24 | |
| 25 | PassRefPtr(const RefPtr<T>& other) |
| 26 | : m_ptr(other.get()) |
| 27 | { |
| 28 | if (m_ptr) |
| 29 | m_ptr->ref(); |
| 30 | } |
| 31 | |
| 32 | ~PassRefPtr() |
| 33 | { |
| 34 | if (m_ptr) |
| 35 | m_ptr->deref(); |
| 36 | } |
| 37 | |
| 38 | T* operator->() const { return m_ptr; } |
| 39 | |
| 40 | T* leakRef() const |
| 41 | { |
| 42 | T* result = m_ptr; |
| 43 | m_ptr = 0; |
| 44 | return result; |
| 45 | } |
| 46 | |
| 47 | private: |
| 48 | PassRefPtr<T>& operator=(const PassRefPtr<T>& t); |
| 49 | |
| 50 | protected: |
| 51 | mutable T* m_ptr; |
| 52 | }; |
| 53 | |
| 54 | template <typename T> |
| 55 | class Ref : public PassRefPtr<T> |
| 56 | { |
| 57 | using PassRefPtr<T>::PassRefPtr; |
| 58 | |
| 59 | template <typename PtrType> friend Ref<PtrType> adoptRef(PtrType*); |
| 60 | }; |
| 61 | |
| 62 | template <typename T> |
| 63 | Ref<T> adoptRef(T* ptr) |
| 64 | { |
| 65 | Ref<T> result; |
| 66 | result.m_ptr = ptr; |
| 67 | return result; |
| 68 | } |
| 69 | |
| 70 | #endif // PASSREFPTR_H |
| 71 |