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#pragma once
namespace std {
typedef decltype(nullptr) nullptr_t;
}
namespace AK {
template<typename T>
inline void retainIfNotNull(T* ptr)
{
if (ptr)
ptr->retain();
}
template<typename T>
inline void releaseIfNotNull(T* ptr)
{
if (ptr)
ptr->release();
}
template<typename T>
class RetainPtr {
public:
enum AdoptTag { Adopt };
RetainPtr() { }
RetainPtr(const T* ptr) : m_ptr(const_cast<T*>(ptr)) { retainIfNotNull(m_ptr); }
RetainPtr(T* ptr) : m_ptr(ptr) { retainIfNotNull(m_ptr); }
RetainPtr(T& object) : m_ptr(&object) { m_ptr->retain(); }
RetainPtr(AdoptTag, T& object) : m_ptr(&object) { }
RetainPtr(RetainPtr&& other) : m_ptr(other.leakRef()) { }
template<typename U> RetainPtr(RetainPtr<U>&& other) : m_ptr(static_cast<T*>(other.leakRef())) { }
~RetainPtr() { clear(); }
RetainPtr(std::nullptr_t) { }
RetainPtr& operator=(RetainPtr&& other)
{
if (this != &other) {
releaseIfNotNull(m_ptr);
m_ptr = other.leakRef();
}
return *this;
}
template<typename U>
RetainPtr& operator=(RetainPtr<U>&& other)
{
if (this != static_cast<void*>(&other)) {
releaseIfNotNull(m_ptr);
m_ptr = other.leakRef();
}
return *this;
}
RetainPtr& operator=(T* ptr)
{
if (m_ptr != ptr)
releaseIfNotNull(m_ptr);
m_ptr = ptr;
retainIfNotNull(m_ptr);
return *this;
}
RetainPtr& operator=(T& object)
{
if (m_ptr != &object)
releaseIfNotNull(m_ptr);
m_ptr = &object;
retainIfNotNull(m_ptr);
return *this;
}
RetainPtr& operator=(std::nullptr_t)
{
clear();
return *this;
}
RetainPtr copyRef() const
{
return RetainPtr(m_ptr);
}
void clear()
{
releaseIfNotNull(m_ptr);
m_ptr = nullptr;
}
bool operator!() const { return !m_ptr; }
typedef T* RetainPtr::*UnspecifiedBoolType;
operator UnspecifiedBoolType() const { return m_ptr ? &RetainPtr::m_ptr : nullptr; }
T* leakRef()
{
T* leakedPtr = m_ptr;
m_ptr = nullptr;
return leakedPtr;
}
T* ptr() { return m_ptr; }
const T* ptr() const { return m_ptr; }
T* operator->() { return m_ptr; }
const T* operator->() const { return m_ptr; }
T& operator*() { return *m_ptr; }
const T& operator*() const { return *m_ptr; }
operator bool() { return !!m_ptr; }
private:
T* m_ptr = nullptr;
};
template<typename T>
inline RetainPtr<T> adopt(T& object)
{
return RetainPtr<T>(RetainPtr<T>::Adopt, object);
}
}
using AK::RetainPtr;
using AK::adopt;
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