Source/core/dom/IgnoreDestructiveWriteCountIncrementer.h

/*
 * 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:
 * 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 GOOGLE 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 GOOGLE 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
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 */

#ifndef IgnoreDestructiveWriteCountIncrementer_h
#define IgnoreDestructiveWriteCountIncrementer_h

#include "core/dom/Document.h"

namespace WebCore {

class IgnoreDestructiveWriteCountIncrementer {
    WTF_MAKE_NONCOPYABLE(IgnoreDestructiveWriteCountIncrementer);
public:
    explicit IgnoreDestructiveWriteCountIncrementer(Document* document)
        : m_count(document ? &document->m_ignoreDestructiveWriteCount : 0)
    {
        if (!m_count)
            return;
        ++(*m_count);
    }

    ~IgnoreDestructiveWriteCountIncrementer()
    {
        if (!m_count)
            return;
        --(*m_count);
    }

private:
    unsigned* m_count;
};

}

#endif