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/*
* Copyright (C) 2023 Igalia S.L.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
#pragma once
#if USE(GLIB)
#include <glib-object.h>
#include <wtf/Noncopyable.h>
namespace WTF {
template <typename T> class GWeakPtr {
WTF_MAKE_NONCOPYABLE(GWeakPtr);
public:
GWeakPtr() = default;
explicit GWeakPtr(T* ptr)
: m_ptr(ptr)
{
RELEASE_ASSERT(!ptr || G_IS_OBJECT(ptr));
addWeakPtr();
}
GWeakPtr(GWeakPtr&& other)
{
reset(other.get());
other.reset();
}
~GWeakPtr()
{
removeWeakPtr();
}
T& operator*() const
{
ASSERT(m_ptr);
return *m_ptr;
}
T* operator->() const
{
ASSERT(m_ptr);
return m_ptr;
}
T* get() const
{
return m_ptr;
}
void reset(T* ptr = nullptr)
{
RELEASE_ASSERT(!ptr || G_IS_OBJECT(ptr));
removeWeakPtr();
m_ptr = ptr;
addWeakPtr();
}
GWeakPtr& operator=(std::nullptr_t)
{
reset();
return *this;
}
GWeakPtr& operator=(GWeakPtr&& other)
{
reset(other.get());
other.reset();
return *this;
}
bool operator!() const { return !m_ptr; }
// This conversion operator allows implicit conversion to bool but not to other integer types.
typedef T* GWeakPtr::*UnspecifiedBoolType;
operator UnspecifiedBoolType() const { return m_ptr ? &GWeakPtr::m_ptr : 0; }
private:
void addWeakPtr()
{
if (m_ptr)
g_object_add_weak_pointer(G_OBJECT(m_ptr), reinterpret_cast<void**>(&m_ptr));
}
void removeWeakPtr()
{
if (m_ptr)
g_object_remove_weak_pointer(G_OBJECT(m_ptr), reinterpret_cast<void**>(&m_ptr));
}
T* m_ptr { nullptr };
};
} // namespace WTF
using WTF::GWeakPtr;
#endif // USE(GLIB)
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