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/*
* Copyright (c) 2022, Tim Schumacher <timschumi@gmx.de>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/NonnullOwnPtr.h>
#include <AK/Variant.h>
namespace AK {
template<typename T>
class MaybeOwned {
public:
template<DerivedFrom<T> U>
MaybeOwned(NonnullOwnPtr<U> handle)
: m_handle(adopt_own<T>(*handle.leak_ptr()))
{
}
// This is made `explicit` to not accidentally create a non-owning MaybeOwned,
// which may not always be intended.
explicit MaybeOwned(T& handle)
: m_handle(&handle)
{
}
T* ptr()
{
if (m_handle.template has<T*>())
return m_handle.template get<T*>();
else
return m_handle.template get<NonnullOwnPtr<T>>();
}
T const* ptr() const
{
if (m_handle.template has<T*>())
return m_handle.template get<T*>();
else
return m_handle.template get<NonnullOwnPtr<T>>();
}
T* operator->() { return ptr(); }
T const* operator->() const { return ptr(); }
T& operator*() { return *ptr(); }
T const& operator*() const { return *ptr(); }
private:
Variant<NonnullOwnPtr<T>, T*> m_handle;
};
}
#if USING_AK_GLOBALLY
using AK::MaybeOwned;
#endif
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