src/antlr/RefCount.hpp

#ifndef INC_RefCount_hpp__
#define INC_RefCount_hpp__
/* ANTLR Translator Generator
 * Project led by Terence Parr at http://www.jGuru.com
 * Software rights: http://www.antlr.org/license.html
 *
 * $Id: RefCount.hpp,v 1.1 2005-12-02 15:38:02 tim Exp $
 */

#include <antlr/config.hpp>

#ifdef ANTLR_CXX_SUPPORTS_NAMESPACE
namespace antlr {
#endif

template<class T>
class ANTLR_API 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;
        }

        template<class newType> operator RefCount<newType>()
        {
                return RefCount<newType>(ref);
        }
};

#ifdef ANTLR_CXX_SUPPORTS_NAMESPACE
}
#endif

#endif //INC_RefCount_hpp__
Revision:	2469
Committed:	Fri Dec 2 15:38:03 2005 UTC (18 years, 7 months ago) by tim
File size:	1415 byte(s)
Log Message:	End of the Link --> List Return of the Oject-Oriented replace yacc/lex parser with antlr parser
#	User	Rev	Content
1	tim	2469	#ifndef INC_RefCount_hpp__
2			#define INC_RefCount_hpp__
3			/* ANTLR Translator Generator
4			* Project led by Terence Parr at http://www.jGuru.com
5			* Software rights: http://www.antlr.org/license.html
6			*
7			* $Id: RefCount.hpp,v 1.1 2005-12-02 15:38:02 tim Exp $
8			*/
9
10			#include <antlr/config.hpp>
11
12			#ifdef ANTLR_CXX_SUPPORTS_NAMESPACE
13			namespace antlr {
14			#endif
15
16			template<class T>
17			class ANTLR_API RefCount {
18			private:
19			struct Ref {
20			T* const ptr;
21			unsigned int count;
22
23			Ref(T* p) : ptr(p), count(1) {}
24			~Ref() {delete ptr;}
25			Ref* increment() {++count;return this;}
26			bool decrement() {return (--count==0);}
27			private:
28			Ref(const Ref&);
29			Ref& operator=(const Ref&);
30			}* ref;
31
32			public:
33			explicit RefCount(T* p = 0)
34			: ref(p ? new Ref(p) : 0)
35			{
36			}
37			RefCount(const RefCount<T>& other)
38			: ref(other.ref ? other.ref->increment() : 0)
39			{
40			}
41			~RefCount()
42			{
43			if (ref && ref->decrement())
44			delete ref;
45			}
46			RefCount<T>& operator=(const RefCount<T>& other)
47			{
48			Ref* tmp = other.ref ? other.ref->increment() : 0;
49			if (ref && ref->decrement())
50			delete ref;
51			ref = tmp;
52			return *this;
53			}
54
55			operator T* () const
56			{
57			return ref ? ref->ptr : 0;
58			}
59
60			T* operator->() const
61			{
62			return ref ? ref->ptr : 0;
63			}
64
65			T* get() const
66			{
67			return ref ? ref->ptr : 0;
68			}
69
70			template<class newType> operator RefCount<newType>()
71			{
72			return RefCount<newType>(ref);
73			}
74			};
75
76			#ifdef ANTLR_CXX_SUPPORTS_NAMESPACE
77			}
78			#endif
79
80			#endif //INC_RefCount_hpp__