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#pragma once
#include "types.h"
#define SANITIZE_REFPTR
template<typename T> class RefPtr;
template<typename T> RefPtr<T> adoptRef(T*);
template<typename T>
class RefPtr {
public:
RefPtr() { }
RefPtr(T* ptr) : m_ptr(ptr) { refIfNotNull(m_ptr); }
~RefPtr()
{
derefIfNotNull(m_ptr);
#ifdef SANITIZE_REFPTR
m_ptr = (T*)(0xeeeeeeee);
#endif
}
RefPtr(RefPtr&& other)
: m_ptr(other.leakPtr())
{
}
RefPtr& operator=(RefPtr&& other)
{
if (this == &other)
return *this;
m_ptr = other.leakPtr();
return *this;
}
template<typename U>
RefPtr(RefPtr<U>&& other)
: m_ptr(static_cast<T*>(other.leakPtr()))
{
}
template<typename U>
RefPtr& operator=(RefPtr<U>&& other)
{
if (this == &other)
return *this;
m_ptr = static_cast<T*>(other.leakPtr());
return *this;
}
RefPtr(const RefPtr& other)
: m_ptr(other.m_ptr)
{
refIfNotNull(m_ptr);
}
RefPtr& operator=(const RefPtr& other)
{
if (this == &other)
return *this;
m_ptr = other.m_ptr;
refIfNotNull(m_ptr);
return *this;
}
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() const { return m_ptr; }
T* leakPtr()
{
T* ptr = m_ptr;
m_ptr = nullptr;
return ptr;
}
private:
template<typename U> friend class RefPtr;
friend RefPtr adoptRef<T>(T*);
enum AdoptTag { Adopt };
RefPtr(AdoptTag, T* ptr) : m_ptr(ptr) { }
inline void refIfNotNull(T* ptr) { if (ptr) ptr->ref(); }
inline void derefIfNotNull(T* ptr) { if (ptr) ptr->deref(); }
T* m_ptr { nullptr };
};
template<typename T>
inline RefPtr<T> adoptRef(T* ptr)
{
ASSERT(ptr->refCount() == 1);
return RefPtr<T>(RefPtr<T>::Adopt, ptr);
}
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