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/*
* Copyright (c) 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/Badge.h>
#include <AK/Noncopyable.h>
#include <AK/RefCounted.h>
#include <AK/RefPtr.h>
#include <LibJS/Forward.h>
namespace JS {
class HandleImpl : public RefCounted<HandleImpl> {
AK_MAKE_NONCOPYABLE(HandleImpl);
AK_MAKE_NONMOVABLE(HandleImpl);
public:
~HandleImpl();
Cell* cell() { return m_cell; }
const Cell* cell() const { return m_cell; }
private:
template<class T>
friend class Handle;
explicit HandleImpl(Cell*);
Cell* m_cell { nullptr };
};
template<class T>
class Handle {
public:
Handle() { }
static Handle create(T* cell)
{
return Handle(adopt(*new HandleImpl(cell)));
}
T* cell() { return static_cast<T*>(m_impl->cell()); }
const T* cell() const { return static_cast<const T*>(m_impl->cell()); }
bool is_null() const { return m_impl.is_null(); }
private:
explicit Handle(NonnullRefPtr<HandleImpl> impl)
: m_impl(move(impl))
{
}
RefPtr<HandleImpl> m_impl;
};
template<class T>
inline Handle<T> make_handle(T* cell)
{
return Handle<T>::create(cell);
}
}
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