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3f52cee595
Trying to make_weak_ptr() on something that has begun destruction is very unlikely to be what you want. Let's assert if that scenario comes up so we can catch it immediately.
85 lines
2.2 KiB
C++
85 lines
2.2 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include "Assertions.h"
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#include "RefCounted.h"
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#include "RefPtr.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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template<typename T>
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class WeakLink : public RefCounted<WeakLink<T>> {
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friend class Weakable<T>;
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public:
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T* ptr() { return static_cast<T*>(m_ptr); }
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const T* ptr() const { return static_cast<const T*>(m_ptr); }
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private:
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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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T* m_ptr;
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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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WeakPtr<T> make_weak_ptr();
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protected:
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Weakable() {}
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~Weakable()
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{
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#ifdef DEBUG
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m_being_destroyed = true;
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#endif
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if (m_link)
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m_link->m_ptr = nullptr;
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}
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private:
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RefPtr<WeakLink<T>> m_link;
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#ifdef DEBUG
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bool m_being_destroyed { false };
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#endif
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};
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}
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using AK::Weakable;
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