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93 lines
1.5 KiB
C++
93 lines
1.5 KiB
C++
/*
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* Copyright (c) 2018-2022, 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/Assertions.h>
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#include <AK/RefCounted.h>
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#include <AK/RefPtr.h>
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#include <AK/StdLibExtras.h>
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namespace AK {
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template<typename T>
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class Weakable;
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template<typename T>
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class WeakPtr;
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class WeakLink : public RefCounted<WeakLink> {
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template<typename T>
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friend class Weakable;
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template<typename T>
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friend class WeakPtr;
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public:
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template<typename T>
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RefPtr<T> strong_ref() const
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requires(IsBaseOf<RefCountedBase, T>)
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{
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return static_cast<T*>(m_ptr);
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}
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template<typename T>
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T* unsafe_ptr() const
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{
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return static_cast<T*>(m_ptr);
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}
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bool is_null() const { return m_ptr == nullptr; }
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void revoke() { m_ptr = nullptr; }
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private:
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template<typename T>
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explicit WeakLink(T& weakable)
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: m_ptr(&weakable)
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{
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}
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mutable void* m_ptr { nullptr };
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};
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template<typename T>
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class Weakable {
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private:
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class Link;
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public:
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template<typename U = T>
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WeakPtr<U> make_weak_ptr() const
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{
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return MUST(try_make_weak_ptr<U>());
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}
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template<typename U = T>
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ErrorOr<WeakPtr<U>> try_make_weak_ptr() const;
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protected:
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Weakable() = default;
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~Weakable()
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{
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revoke_weak_ptrs();
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}
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void revoke_weak_ptrs()
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{
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if (auto link = move(m_link))
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link->revoke();
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}
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private:
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mutable RefPtr<WeakLink> m_link;
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};
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}
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#if USING_AK_GLOBALLY
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using AK::Weakable;
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#endif
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