RefCount.hpp
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上传日期:2007-01-06
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- #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);}
- }* 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__