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# pragma once
template <typename T>
class com_ptr
{
//private:
// typedef void (com_ptr::*bool_type)() const;
// void safe_bool() const {}
//
//
public:
com_ptr():
_ptr(nullptr)
{
}
com_ptr(T* ptr, bool add_ref = false):
_ptr(ptr)
{
if (_ptr && add_ref)
_ptr->AddRef();
}
com_ptr(const com_ptr& rhs):
_ptr(rhs._ptr)
{
if (_ptr)
_ptr->AddRef();
}
com_ptr(com_ptr&& rhs):
_ptr(rhs._ptr)
{
rhs._ptr = nullptr;
}
template <typename U>
com_ptr(const com_ptr<U>& rhs):
_ptr(rhs._ptr)
{
if (_ptr)
_ptr->AddRef();
}
~com_ptr()
{
if (_ptr)
_ptr->Release();
}
com_ptr& operator = (const com_ptr& rhs)
{
com_ptr(rhs).swap(*this);
return *this;
}
com_ptr& operator = (com_ptr&& rhs)
{
com_ptr(static_cast<com_ptr&&>(rhs)).swap(*this);
return *this;
}
template <typename U>
com_ptr& operator = (const com_ptr<U>& rhs)
{
com_ptr(rhs).swap(*this):
return *this;
}
com_ptr& operator = (T* rhs)
{
com_ptr(rhs).swap(*this);
return *this;
}
//operator bool_type() const
//{
// return _ptr ? &com_ptr::safe_bool : nullptr;
//}
//bool_type operator !() const
//{
// return !((bool_type)*this);
//}
void reset()
{
com_ptr().swap(*this);
}
void reset(T* rhs)
{
com_ptr(rhs).swap(*this);
}
void reset(T* rhs, bool add_ref)
{
com_ptr(rhs, add_ref).swap(*this);
}
T* get() const
{
return _ptr;
}
T* detach()
{
auto result = _ptr;
_ptr = nullptr;
return result;
}
void swap(com_ptr& rhs)
{
T* temp = rhs._ptr;
rhs._ptr = _ptr;
_ptr = temp;
}
T& operator * () const { return *_ptr; }
T* operator -> () const { return _ptr; }
operator T* () const { return _ptr; }
T** operator & () { return &_ptr; }
private:
T* _ptr;
};
template <typename T, typename U> inline bool operator==(const com_ptr<T>& a, const com_ptr<U>& b) { return a.get() == b.get(); }
template <typename T, typename U> inline bool operator!=(const com_ptr<T>& a, const com_ptr<U>& b) { return a.get() != b.get(); }
template <typename T, typename U> inline bool operator==(const com_ptr<T>& a, U* b) { return a.get() == b; }
template <typename T, typename U> inline bool operator!=(const com_ptr<T>& a, U* b) { return a.get() != b; }
template <typename T, typename U> inline bool operator==(T* a, const com_ptr<U>& b) { return a == b.get(); }
template <typename T, typename U> inline bool operator!=(T* a, const com_ptr<U>& b) { return a != b.get(); }
template <typename T> inline bool operator==(const com_ptr<T>& p, std::nullptr_t) { return p.get() == nullptr; }
template <typename T> inline bool operator==(std::nullptr_t, const com_ptr<T>& p) { return p.get() == nullptr; }
template <typename T> inline bool operator!=(const com_ptr<T>& p, std::nullptr_t) { return p.get() != nullptr; }
template <typename T> inline bool operator!=(std::nullptr_t, const com_ptr<T>& p) { return p.get() != nullptr; }
template <typename T> inline bool operator<(const com_ptr<T>& a, const com_ptr<T>& b) { return std::less<T*>()(a.get(), b.get()); }
template <typename T> inline bool operator<=(const com_ptr<T>& a, const com_ptr<T>& b) { return std::less_equal<T*>()(a.get(), b.get()); }
template <typename T> inline bool operator>(const com_ptr<T>& a, const com_ptr<T>& b) { return std::greater<T*>()(a.get(), b.get()); }
template <typename T> inline bool operator>=(const com_ptr<T>& a, const com_ptr<T>& b) { return std::greater_equal<T*>()(a.get(), b.get()); }
template <typename T> void swap(com_ptr<T> & lhs, com_ptr<T> & rhs) { lhs.swap(rhs); }
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