text: /*
   * Copyright (C) 2009 Apple 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 APPLE 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 APPLE 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
   * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
   */
  
  #pragma once
  
  #include <wtf/Assertions.h>
  #include <wtf/FastMalloc.h>
  #include <string.h>
  
  namespace WebCore {
      
  class IdentifierRep {
      WTF_MAKE_FAST_ALLOCATED;
  public:
      WEBCORE_EXPORT static IdentifierRep* get(int);
      WEBCORE_EXPORT static IdentifierRep* get(const char*);
  
      WEBCORE_EXPORT static bool isValid(IdentifierRep*);
      
      bool isString() const { return m_isString; }
  
      int number() const { return m_isString ? 0 : m_value.m_number; }
      const char* string() const { return m_isString ? m_value.m_string : 0; }
  
  private:
      explicit IdentifierRep(int number) 
          : m_isString(false)
      {
          m_value.m_number = number;
      }
      
      explicit IdentifierRep(const char* name)
          : m_isString(true)
      {
          m_value.m_string = fastStrDup(name);
      }
      
      ~IdentifierRep(); // Not implemented
      
      union {
          const char* m_string;
          int m_number;
      } m_value;
      bool m_isString;
  };
  
  } // namespace WebCore
  
  