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/*
* Copyright (C) 2013 Google, Inc. All rights reserved.
* Copyright (C) 2015-2020 Apple Inc. 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 APPLE INC. ``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 APPLE INC. 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 <wtf/CompactRefPtrTuple.h>
#include <wtf/Packed.h>
#include <wtf/WeakPtrFactory.h>
#include <wtf/WeakRef.h>
namespace WTF {
template<typename WeakPtrFactoryType, WeakPtrFactoryInitialization initializationMode = WeakPtrFactoryInitialization::Lazy>
class CanMakeWeakPtrBase {
public:
using WeakValueType = typename WeakPtrFactoryType::ObjectType;
using WeakPtrImplType = typename WeakPtrFactoryType::WeakPtrImplType;
WeakPtrImplType* weakImplIfExists() const { return m_weakPtrFactory.impl(); }
WeakPtrImplType& weakImpl() const
{
initializeWeakPtrFactory();
return *m_weakPtrFactory.impl();
}
unsigned weakCount() const { return m_weakPtrFactory.weakPtrCount(); }
protected:
CanMakeWeakPtrBase()
{
if (initializationMode == WeakPtrFactoryInitialization::Eager)
initializeWeakPtrFactory();
}
CanMakeWeakPtrBase(const CanMakeWeakPtrBase&)
{
if (initializationMode == WeakPtrFactoryInitialization::Eager)
initializeWeakPtrFactory();
}
CanMakeWeakPtrBase& operator=(const CanMakeWeakPtrBase&) { return *this; }
void initializeWeakPtrFactory() const
{
m_weakPtrFactory.initializeIfNeeded(static_cast<const WeakValueType&>(*this));
}
const WeakPtrFactoryType& weakPtrFactory() const { return m_weakPtrFactory; }
WeakPtrFactoryType& weakPtrFactory() { return m_weakPtrFactory; }
private:
WeakPtrFactoryType m_weakPtrFactory;
};
template<typename T, WeakPtrFactoryInitialization initializationMode = WeakPtrFactoryInitialization::Lazy, typename WeakPtrImpl = DefaultWeakPtrImpl>
using CanMakeWeakPtr = CanMakeWeakPtrBase<WeakPtrFactory<T, WeakPtrImpl>, initializationMode>;
template<typename T, WeakPtrFactoryInitialization initializationMode = WeakPtrFactoryInitialization::Lazy, typename WeakPtrImpl = DefaultWeakPtrImpl>
using CanMakeWeakPtrWithBitField = CanMakeWeakPtrBase<WeakPtrFactoryWithBitField<T, WeakPtrImpl>, initializationMode>;
template<typename T, WeakPtrFactoryInitialization initializationMode = WeakPtrFactoryInitialization::Lazy>
using CanMakeSingleThreadWeakPtr = CanMakeWeakPtr<T, initializationMode, SingleThreadWeakPtrImpl>;
} // namespace WTF
using WTF::CanMakeWeakPtr;
using WTF::CanMakeWeakPtrWithBitField;
using WTF::CanMakeSingleThreadWeakPtr;
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