#ifndef COMPtr_h
#define COMPtr_h
#define NOMINMAX
#include <guiddef.h>
#include <unknwn.h>
#include <WTF/Assertions.h>
typedef long HRESULT;
enum AdoptCOMTag { AdoptCOM };
enum QueryTag { Query };
template <typename T> class COMPtr {
public:
COMPtr() : m_ptr(0) { }
COMPtr(T* ptr) : m_ptr(ptr) { if (m_ptr) m_ptr->AddRef(); }
COMPtr(AdoptCOMTag, T* ptr) : m_ptr(ptr) { }
COMPtr(const COMPtr& o) : m_ptr(o.m_ptr) { if (T* ptr = m_ptr) ptr->AddRef(); }
inline COMPtr(QueryTag, IUnknown* ptr) : m_ptr(copyQueryInterfaceRef(ptr)) { }
template <typename U> inline COMPtr(QueryTag, const COMPtr<U>& ptr) : m_ptr(copyQueryInterfaceRef(ptr)) { }
~COMPtr() { if (m_ptr) m_ptr->Release(); }
T* get() const { return m_ptr; }
T& operator*() const { return *m_ptr; }
T* operator->() const { return m_ptr; }
T** operator&() { ASSERT(!m_ptr); return &m_ptr; }
bool operator!() const { return !m_ptr; }
typedef T* (COMPtr::*UnspecifiedBoolType)() const;
operator UnspecifiedBoolType() const { return m_ptr ? &COMPtr::get : 0; }
COMPtr& operator=(const COMPtr&);
COMPtr& operator=(T*);
template <typename U> COMPtr& operator=(const COMPtr<U>&);
void query(IUnknown* ptr) { adoptRef(copyQueryInterfaceRef(ptr)); }
template <typename U> inline void query(const COMPtr<U>& ptr) { query(ptr.get()); }
HRESULT copyRefTo(T**);
void adoptRef(T*);
private:
static T* copyQueryInterfaceRef(IUnknown*);
T* m_ptr;
};
template <typename T> inline T* COMPtr<T>::copyQueryInterfaceRef(IUnknown* ptr)
{
if (!ptr)
return 0;
T* result;
if (FAILED(ptr->QueryInterface(&result)))
return 0;
return result;
}
template <typename T> inline HRESULT COMPtr<T>::copyRefTo(T** ptr)
{
if (!ptr)
return E_POINTER;
*ptr = m_ptr;
if (m_ptr)
m_ptr->AddRef();
return S_OK;
}
template <typename T> inline void COMPtr<T>::adoptRef(T *ptr)
{
if (m_ptr)
m_ptr->Release();
m_ptr = ptr;
}
template <typename T> inline COMPtr<T>& COMPtr<T>::operator=(const COMPtr<T>& o)
{
T* optr = o.get();
if (optr)
optr->AddRef();
T* ptr = m_ptr;
m_ptr = optr;
if (ptr)
ptr->Release();
return *this;
}
template <typename T> template <typename U> inline COMPtr<T>& COMPtr<T>::operator=(const COMPtr<U>& o)
{
T* optr = o.get();
if (optr)
optr->AddRef();
T* ptr = m_ptr;
m_ptr = optr;
if (ptr)
ptr->Release();
return *this;
}
template <typename T> inline COMPtr<T>& COMPtr<T>::operator=(T* optr)
{
if (optr)
optr->AddRef();
T* ptr = m_ptr;
m_ptr = optr;
if (ptr)
ptr->Release();
return *this;
}
template <typename T, typename U> inline bool operator==(const COMPtr<T>& a, const COMPtr<U>& b)
{
return a.get() == b.get();
}
template <typename T, typename U> inline bool operator==(const COMPtr<T>& a, U* b)
{
return a.get() == b;
}
template <typename T, typename U> inline bool operator==(T* a, const COMPtr<U>& b)
{
return a == b.get();
}
template <typename T, typename U> inline bool operator!=(const COMPtr<T>& a, const COMPtr<U>& b)
{
return a.get() != b.get();
}
template <typename T, typename U> inline bool operator!=(const COMPtr<T>& a, U* b)
{
return a.get() != b;
}
template <typename T, typename U> inline bool operator!=(T* a, const COMPtr<U>& b)
{
return a != b.get();
}
#endif