mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2024-11-23 08:00:20 +00:00
115 lines
3.4 KiB
C++
115 lines
3.4 KiB
C++
/*
|
|
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright notice, this
|
|
* list of conditions and the following disclaimer.
|
|
*
|
|
* 2. Redistributions in binary form must reproduce the above copyright notice,
|
|
* this list of conditions and the following disclaimer in the documentation
|
|
* and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
|
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
|
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
|
|
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
|
|
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
|
|
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <AK/LogStream.h>
|
|
#include <AK/Weakable.h>
|
|
|
|
namespace AK {
|
|
|
|
template<typename T>
|
|
class OwnPtr;
|
|
|
|
template<typename T>
|
|
class WeakPtr {
|
|
friend class Weakable<T>;
|
|
|
|
public:
|
|
WeakPtr() { }
|
|
WeakPtr(std::nullptr_t) { }
|
|
|
|
template<typename U>
|
|
WeakPtr(WeakPtr<U>&& other)
|
|
: m_link(reinterpret_cast<WeakLink<T>*>(other.take_link().ptr()))
|
|
{
|
|
}
|
|
|
|
template<typename U>
|
|
WeakPtr& operator=(WeakPtr<U>&& other)
|
|
{
|
|
m_link = reinterpret_cast<WeakLink<T>*>(other.take_link().ptr());
|
|
return *this;
|
|
}
|
|
|
|
operator bool() const { return ptr(); }
|
|
|
|
T* ptr() { return m_link ? m_link->ptr() : nullptr; }
|
|
const T* ptr() const { return m_link ? m_link->ptr() : nullptr; }
|
|
|
|
T* operator->() { return ptr(); }
|
|
const T* operator->() const { return ptr(); }
|
|
|
|
T& operator*() { return *ptr(); }
|
|
const T& operator*() const { return *ptr(); }
|
|
|
|
operator const T*() const { return ptr(); }
|
|
operator T*() { return ptr(); }
|
|
|
|
bool is_null() const { return !m_link || !m_link->ptr(); }
|
|
void clear() { m_link = nullptr; }
|
|
|
|
RefPtr<WeakLink<T>> take_link() { return move(m_link); }
|
|
|
|
bool operator==(const OwnPtr<T>& other) const { return ptr() == other.ptr(); }
|
|
|
|
private:
|
|
WeakPtr(RefPtr<WeakLink<T>> link)
|
|
: m_link(move(link))
|
|
{
|
|
}
|
|
|
|
RefPtr<WeakLink<T>> m_link;
|
|
};
|
|
|
|
template<typename T>
|
|
inline WeakPtr<T> Weakable<T>::make_weak_ptr()
|
|
{
|
|
#ifdef DEBUG
|
|
ASSERT(!m_being_destroyed);
|
|
#endif
|
|
if (!m_link)
|
|
m_link = adopt(*new WeakLink<T>(static_cast<T&>(*this)));
|
|
return WeakPtr<T>(m_link);
|
|
}
|
|
|
|
template<typename T>
|
|
inline const LogStream& operator<<(const LogStream& stream, const WeakPtr<T>& value)
|
|
{
|
|
return stream << value.ptr();
|
|
}
|
|
|
|
template<typename T>
|
|
struct Formatter<WeakPtr<T>> : Formatter<const T*> {
|
|
void format(TypeErasedFormatParams& params, FormatBuilder& builder, const WeakPtr<T>& value)
|
|
{
|
|
Formatter<const T*>::format(params, builder, value.ptr());
|
|
}
|
|
};
|
|
|
|
}
|
|
|
|
using AK::WeakPtr;
|