text: #ifndef INC_RefCount_hpp__
  #define INC_RefCount_hpp__
  
  /**
   * <b>SOFTWARE RIGHTS</b>
   * <p>
   * ANTLR 2.6.0 MageLang Insitute, 1999
   * <p>
   * We reserve no legal rights to the ANTLR--it is fully in the
   * public domain. An individual or company may do whatever
   * they wish with source code distributed with ANTLR or the
   * code generated by ANTLR, including the incorporation of
   * ANTLR, or its output, into commerical software.
   * <p>
   * We encourage users to develop software with ANTLR. However,
   * we do ask that credit is given to us for developing
   * ANTLR. By "credit", we mean that if you use ANTLR or
   * incorporate any source code into one of your programs
   * (commercial product, research project, or otherwise) that
   * you acknowledge this fact somewhere in the documentation,
   * research report, etc... If you like ANTLR and have
   * developed a nice tool with the output, please mention that
   * you developed it using ANTLR. In addition, we ask that the
   * headers remain intact in our source code. As long as these
   * guidelines are kept, we expect to continue enhancing this
   * system and expect to make other tools available as they are
   * completed.
   * <p>
   * The ANTLR gang:
   * @version ANTLR 2.6.0 MageLang Insitute, 1999
   * @author Terence Parr, <a href=http://www.MageLang.com>MageLang Institute</a>
   * @author <br>John Lilley, <a href=http://www.Empathy.com>Empathy Software</a>
   * @author <br><a href="mailto:pete@yamuna.demon.co.uk">Pete Wells</a>
   */
  
  #include "antlr/config.hpp"
  
  ANTLR_BEGIN_NAMESPACE(antlr)
  
  template<class T>
  class RefCount {
  private:
  	struct Ref {
  		T* const ptr;
  		unsigned int count;
  
  		Ref(T* p) : ptr(p), count(1) {}
  		~Ref() {delete ptr;}
  		Ref* increment() {++count;return this;}
  		bool decrement() {return (--count==0);}
  	private:
  		Ref(const Ref&);
  		Ref& operator=(const Ref&);
  	}* ref;
  
  public:
  	explicit RefCount(T* p=0) 
  		: ref(p ? new Ref(p) : 0)
  	{
  	}
  	RefCount(const RefCount<T>& other) 
  		: ref(other.ref ? other.ref->increment() : 0)
  	{
  	}
  	~RefCount()
  	{
  		if (ref && ref->decrement()) delete ref;
  	}
  	RefCount<T>& operator=(const RefCount<T>& other)
  	{
  		Ref* tmp=other.ref ? other.ref->increment() : 0;
  		if (ref && ref->decrement()) delete ref;
  		ref=tmp;
  		return *this;
  	}
  
  	operator T* () const
  		{ return ref ? ref->ptr : 0; }
  	T* operator->() const
  		{ return ref ? ref->ptr : 0; }
  	T* get() const
  		{ return ref ? ref->ptr : 0; }
  };
  
  ANTLR_END_NAMESPACE
  
  #endif //INC_RefCount_hpp__
  