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      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 APPLE 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 APPLE 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 NestingLevelIncrementer_h
     27 #define NestingLevelIncrementer_h
     28 
     29 #include "platform/heap/Handle.h"
     30 #include "wtf/Noncopyable.h"
     31 
     32 namespace blink {
     33 
     34 class NestingLevelIncrementer {
     35     STACK_ALLOCATED();
     36     WTF_MAKE_NONCOPYABLE(NestingLevelIncrementer);
     37 public:
     38     explicit NestingLevelIncrementer(unsigned& nestingLevel)
     39         : m_nestingLevel(&nestingLevel)
     40     {
     41         ++(*m_nestingLevel);
     42     }
     43 
     44     ~NestingLevelIncrementer()
     45     {
     46         --(*m_nestingLevel);
     47     }
     48 
     49 private:
     50     unsigned* m_nestingLevel;
     51 };
     52 
     53 }
     54 
     55 #endif
     56