third_party/WebKit/Source/core/dom/IgnoreDestructiveWriteCountIncrementer.h

   1 /*
   2  * Copyright (C) 2010 Google, Inc. All Rights Reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY GOOGLE INC. ``AS IS'' AND ANY
  14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL GOOGLE INC. OR
  17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #ifndef IgnoreDestructiveWriteCountIncrementer_h
  27 #define IgnoreDestructiveWriteCountIncrementer_h
  28
  29 #include "core/dom/Document.h"
  30 #include "wtf/Allocator.h"
  31
  32 namespace blink {
  33
  34 class IgnoreDestructiveWriteCountIncrementer {
  35     STACK_ALLOCATED();
  36     WTF_MAKE_NONCOPYABLE(IgnoreDestructiveWriteCountIncrementer);
  37 public:
  38     explicit IgnoreDestructiveWriteCountIncrementer(Document* document)
  39         : m_count(document ? &document->m_ignoreDestructiveWriteCount : 0)
  40     {
  41         if (!m_count)
  42             return;
  43         ++(*m_count);
  44     }
  45
  46     ~IgnoreDestructiveWriteCountIncrementer()
  47     {
  48         if (!m_count)
  49             return;
  50         --(*m_count);
  51     }
  52
  53 private:
  54     unsigned* m_count;
  55 };
  56
  57 }
  58
  59 #endif