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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.h"
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__
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