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https://github.com/RGBCube/serenity
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35 lines
975 B
C++
35 lines
975 B
C++
/*
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* Copyright (c) 2021, 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/RefCounted.h>
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namespace Kernel {
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// ListedRefCounted<T> is a slot-in replacement for RefCounted<T> to use in classes
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// that add themselves to a SpinlockProtected<IntrusiveList> when constructed.
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// The custom unref() implementation here ensures that the the list is locked during
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// unref(), and that the T is removed from the list before ~T() is invoked.
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template<typename T>
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class ListedRefCounted : public RefCountedBase {
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public:
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bool unref() const
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{
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bool did_hit_zero = T::all_instances().with([&](auto& list) {
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if (deref_base())
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return false;
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list.remove(const_cast<T&>(static_cast<T const&>(*this)));
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return true;
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});
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if (did_hit_zero)
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delete const_cast<T*>(static_cast<T const*>(this));
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return did_hit_zero;
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}
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};
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}
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