mirror of
https://github.com/RGBCube/serenity
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746b310061
This allows us to remove a HashTable from heap and cuts down on some of the malloc traffic when creating handles.
71 lines
1.4 KiB
C++
71 lines
1.4 KiB
C++
/*
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* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/Badge.h>
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#include <AK/IntrusiveList.h>
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#include <AK/Noncopyable.h>
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#include <AK/RefCounted.h>
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#include <AK/RefPtr.h>
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#include <LibJS/Forward.h>
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namespace JS {
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class HandleImpl : public RefCounted<HandleImpl> {
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AK_MAKE_NONCOPYABLE(HandleImpl);
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AK_MAKE_NONMOVABLE(HandleImpl);
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public:
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~HandleImpl();
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Cell* cell() { return m_cell; }
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const Cell* cell() const { return m_cell; }
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private:
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template<class T>
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friend class Handle;
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explicit HandleImpl(Cell*);
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Cell* m_cell { nullptr };
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IntrusiveListNode<HandleImpl> m_list_node;
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public:
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using List = IntrusiveList<HandleImpl, RawPtr<HandleImpl>, &HandleImpl::m_list_node>;
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};
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template<class T>
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class Handle {
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public:
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Handle() { }
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static Handle create(T* cell)
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{
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return Handle(adopt_ref(*new HandleImpl(cell)));
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}
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T* cell() { return static_cast<T*>(m_impl->cell()); }
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const T* cell() const { return static_cast<const T*>(m_impl->cell()); }
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bool is_null() const { return m_impl.is_null(); }
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private:
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explicit Handle(NonnullRefPtr<HandleImpl> impl)
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: m_impl(move(impl))
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{
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}
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RefPtr<HandleImpl> m_impl;
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};
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template<class T>
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inline Handle<T> make_handle(T* cell)
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{
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return Handle<T>::create(cell);
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}
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}
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