Source/WebCore/bindings/js/ScriptWrappable.h

/*
 * Copyright (C) 2013 Apple Inc. All rights reserved.
 * Copyright (c) 2010, Google 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:
 * 
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * 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.
 *     * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 * 
 * 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
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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 */

#pragma once

#include <JavaScriptCore/Weak.h>
#include <wtf/IsoMalloc.h>

namespace JSC {
class WeakHandleOwner;
}

namespace WebCore {

class JSDOMObject;

class ScriptWrappable {
public:
    JSDOMObject* wrapper() const;
    void setWrapper(JSDOMObject*, JSC::WeakHandleOwner*, void*);
    void clearWrapper(JSDOMObject*);

    template<typename Derived>
    static ptrdiff_t offsetOfWrapper() { return CAST_OFFSET(Derived*, ScriptWrappable*) + OBJECT_OFFSETOF(ScriptWrappable, m_wrapper); }

protected:
    ~ScriptWrappable() = default;

private:
    JSC::Weak<JSDOMObject> m_wrapper;
};

} // namespace WebCore