mirror of
https://github.com/RGBCube/serenity
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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.
107 lines
3.1 KiB
C++
107 lines
3.1 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 <AK/LogStream.h>
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#include <AK/Weakable.h>
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namespace AK {
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template<typename T>
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class OwnPtr;
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template<typename T>
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class WeakPtr {
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friend class Weakable<T>;
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public:
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WeakPtr() {}
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WeakPtr(std::nullptr_t) {}
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template<typename U>
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WeakPtr(WeakPtr<U>&& other)
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: m_link(reinterpret_cast<WeakLink<T>*>(other.take_link().ptr()))
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{
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}
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template<typename U>
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WeakPtr& operator=(WeakPtr<U>&& other)
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{
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m_link = reinterpret_cast<WeakLink<T>*>(other.take_link().ptr());
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return *this;
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}
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operator bool() const { return ptr(); }
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T* ptr() { return m_link ? m_link->ptr() : nullptr; }
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const T* ptr() const { return m_link ? m_link->ptr() : nullptr; }
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T* operator->() { return ptr(); }
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const T* operator->() const { return ptr(); }
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T& operator*() { return *ptr(); }
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const T& operator*() const { return *ptr(); }
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operator const T*() const { return ptr(); }
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operator T*() { return ptr(); }
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bool is_null() const { return !m_link || !m_link->ptr(); }
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void clear() { m_link = nullptr; }
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RefPtr<WeakLink<T>> take_link() { return move(m_link); }
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bool operator==(const OwnPtr<T>& other) const { return ptr() == other.ptr(); }
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private:
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WeakPtr(RefPtr<WeakLink<T>> link)
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: m_link(move(link))
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{
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}
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RefPtr<WeakLink<T>> m_link;
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};
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template<typename T>
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inline WeakPtr<T> Weakable<T>::make_weak_ptr()
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{
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#ifdef DEBUG
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ASSERT(!m_being_destroyed);
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#endif
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if (!m_link)
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m_link = adopt(*new WeakLink<T>(static_cast<T&>(*this)));
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return WeakPtr<T>(m_link);
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}
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template<typename T>
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inline const LogStream& operator<<(const LogStream& stream, const WeakPtr<T>& value)
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{
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return stream << value.ptr();
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}
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}
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using AK::WeakPtr;
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