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https://github.com/RGBCube/serenity
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Import all this stuff into a single repo called Serenity.
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128
AK/RetainPtr.h
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128
AK/RetainPtr.h
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#pragma once
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#include <cstddef>
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#include <utility>
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namespace AK {
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template<typename T>
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inline void retainIfNotNull(T* ptr)
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{
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if (ptr)
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ptr->retain();
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}
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template<typename T>
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inline void releaseIfNotNull(T* ptr)
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{
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if (ptr)
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ptr->release();
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}
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template<typename T>
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class RetainPtr {
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public:
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enum AdoptTag { Adopt };
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RetainPtr() { }
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RetainPtr(const T* ptr) : m_ptr(const_cast<T*>(ptr)) { retainIfNotNull(m_ptr); }
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RetainPtr(T* ptr) : m_ptr(ptr) { retainIfNotNull(m_ptr); }
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RetainPtr(T& object) : m_ptr(&object) { m_ptr->retain(); }
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RetainPtr(AdoptTag, T& object) : m_ptr(&object) { }
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RetainPtr(RetainPtr&& other) : m_ptr(other.leakRef()) { }
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template<typename U> RetainPtr(RetainPtr<U>&& other) : m_ptr(static_cast<T*>(other.leakRef())) { }
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~RetainPtr() { clear(); }
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RetainPtr(std::nullptr_t) { }
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RetainPtr& operator=(RetainPtr&& other)
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{
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if (this != &other) {
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releaseIfNotNull(m_ptr);
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m_ptr = other.leakRef();
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}
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return *this;
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}
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template<typename U>
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RetainPtr& operator=(RetainPtr<U>&& other)
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{
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if (this != static_cast<void*>(&other)) {
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releaseIfNotNull(m_ptr);
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m_ptr = other.leakRef();
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}
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return *this;
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}
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RetainPtr& operator=(T* ptr)
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{
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if (m_ptr != ptr)
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releaseIfNotNull(m_ptr);
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m_ptr = ptr;
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retainIfNotNull(m_ptr);
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return *this;
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}
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RetainPtr& operator=(T& object)
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{
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if (m_ptr != &object)
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releaseIfNotNull(m_ptr);
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m_ptr = &object;
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retainIfNotNull(m_ptr);
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return *this;
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}
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RetainPtr& operator=(std::nullptr_t)
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{
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clear();
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return *this;
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}
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RetainPtr copyRef() const
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{
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return RetainPtr(m_ptr);
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}
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void clear()
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{
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releaseIfNotNull(m_ptr);
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m_ptr = nullptr;
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}
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bool operator!() const { return !m_ptr; }
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typedef T* RetainPtr::*UnspecifiedBoolType;
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operator UnspecifiedBoolType() const { return m_ptr ? &RetainPtr::m_ptr : nullptr; }
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T* leakRef()
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{
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T* leakedPtr = m_ptr;
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m_ptr = nullptr;
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return leakedPtr;
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}
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T* ptr() { return m_ptr; }
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const T* ptr() const { return m_ptr; }
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T* operator->() { return m_ptr; }
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const T* operator->() const { return m_ptr; }
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T& operator*() { return *m_ptr; }
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const T& operator*() const { return *m_ptr; }
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operator bool() { return !!m_ptr; }
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private:
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T* m_ptr = nullptr;
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};
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template<typename T>
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inline RetainPtr<T> adopt(T& object)
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{
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return RetainPtr<T>(RetainPtr<T>::Adopt, object);
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}
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}
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using AK::RetainPtr;
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using AK::adopt;
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