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/*
* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/Badge.h>
#include <AK/IntrusiveList.h>
#include <AK/Noncopyable.h>
#include <AK/RefCounted.h>
#include <AK/RefPtr.h>
#include <LibJS/Forward.h>
namespace JS {
class HandleImpl : public RefCounted<HandleImpl> {
AK_MAKE_NONCOPYABLE(HandleImpl);
AK_MAKE_NONMOVABLE(HandleImpl);
public:
~HandleImpl();
Cell* cell() { return m_cell; }
const Cell* cell() const { return m_cell; }
private:
template<class T>
friend class Handle;
explicit HandleImpl(Cell*);
Cell* m_cell { nullptr };
IntrusiveListNode<HandleImpl> m_list_node;
public:
using List = IntrusiveList<&HandleImpl::m_list_node>;
};
template<class T>
class Handle {
public:
Handle() = default;
static Handle create(T* cell)
{
return Handle(adopt_ref(*new HandleImpl(cell)));
}
T* cell() { return static_cast<T*>(m_impl->cell()); }
const T* cell() const { return static_cast<const T*>(m_impl->cell()); }
bool is_null() const { return m_impl.is_null(); }
T* operator->() { return cell(); }
T const* operator->() const { return cell(); }
private:
explicit Handle(NonnullRefPtr<HandleImpl> impl)
: m_impl(move(impl))
{
}
RefPtr<HandleImpl> m_impl;
};
template<class T>
inline Handle<T> make_handle(T* cell)
{
return Handle<T>::create(cell);
}
}
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