src/antlr/TokenRefCount.hpp

#ifndef INC_TokenRefCount_hpp__
# define INC_TokenRefCount_hpp__

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

# include <antlr/config.hpp>

#ifdef ANTLR_CXX_SUPPORTS_NAMESPACE
namespace antlr {
#endif

class Token;

struct ANTLR_API TokenRef
{
        Token* const ptr;
        unsigned int count;

        TokenRef(Token* p);
        ~TokenRef();
        TokenRef* increment()
        {
                ++count;
                return this;
        }
        bool decrement()
        {
                return (--count==0);
        }

        static TokenRef* getRef(const Token* p);
private:
        TokenRef( const TokenRef& );
        TokenRef& operator=( const TokenRef& );
};

template<class T>
        class ANTLR_API TokenRefCount
{
private:
        TokenRef* ref;

public:
        TokenRefCount(const Token* p=0)
        : ref(p ? TokenRef::getRef(p) : 0)
        {
        }
        TokenRefCount(const TokenRefCount<T>& other)
        : ref(other.ref ? other.ref->increment() : 0)
        {
        }
        ~TokenRefCount()
        {
                if (ref && ref->decrement())
                        delete ref;
        }
        TokenRefCount<T>& operator=(Token* other)
        {
                TokenRef* tmp = TokenRef::getRef(other);

                if (ref && ref->decrement())
                        delete ref;

                ref=tmp;

                return *this;
        }
        TokenRefCount<T>& operator=(const TokenRefCount<T>& other)
        {
                if( other.ref != ref )
                {
                        TokenRef* tmp = other.ref ? other.ref->increment() : 0;

                        if (ref && ref->decrement())
                                delete ref;

                        ref=tmp;
                }
                return *this;
        }

        operator T* ()  const { return ref ? static_cast<T*>(ref->ptr) : 0; }
        T* operator->() const { return ref ? static_cast<T*>(ref->ptr) : 0; }
        T* get()        const { return ref ? static_cast<T*>(ref->ptr) : 0; }
};

typedef TokenRefCount<Token> RefToken;

#ifdef ANTLR_CXX_SUPPORTS_NAMESPACE
}
#endif

#endif //INC_TokenRefCount_hpp__
Revision:	2469
Committed:	Fri Dec 2 15:38:03 2005 UTC (18 years, 7 months ago) by tim
File size:	1784 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_TokenRefCount_hpp__
2			# define INC_TokenRefCount_hpp__
3
4			/* ANTLR Translator Generator
5			* Project led by Terence Parr at http://www.jGuru.com
6			* Software rights: http://www.antlr.org/license.html
7			*
8			* $Id: TokenRefCount.hpp,v 1.1 2005-12-02 15:38:02 tim Exp $
9			*/
10
11			# include <antlr/config.hpp>
12
13			#ifdef ANTLR_CXX_SUPPORTS_NAMESPACE
14			namespace antlr {
15			#endif
16
17			class Token;
18
19			struct ANTLR_API TokenRef
20			{
21			Token* const ptr;
22			unsigned int count;
23
24			TokenRef(Token* p);
25			~TokenRef();
26			TokenRef* increment()
27			{
28			++count;
29			return this;
30			}
31			bool decrement()
32			{
33			return (--count==0);
34			}
35
36			static TokenRef* getRef(const Token* p);
37			private:
38			TokenRef( const TokenRef& );
39			TokenRef& operator=( const TokenRef& );
40			};
41
42			template<class T>
43			class ANTLR_API TokenRefCount
44			{
45			private:
46			TokenRef* ref;
47
48			public:
49			TokenRefCount(const Token* p=0)
50			: ref(p ? TokenRef::getRef(p) : 0)
51			{
52			}
53			TokenRefCount(const TokenRefCount<T>& other)
54			: ref(other.ref ? other.ref->increment() : 0)
55			{
56			}
57			~TokenRefCount()
58			{
59			if (ref && ref->decrement())
60			delete ref;
61			}
62			TokenRefCount<T>& operator=(Token* other)
63			{
64			TokenRef* tmp = TokenRef::getRef(other);
65
66			if (ref && ref->decrement())
67			delete ref;
68
69			ref=tmp;
70
71			return *this;
72			}
73			TokenRefCount<T>& operator=(const TokenRefCount<T>& other)
74			{
75			if( other.ref != ref )
76			{
77			TokenRef* tmp = other.ref ? other.ref->increment() : 0;
78
79			if (ref && ref->decrement())
80			delete ref;
81
82			ref=tmp;
83			}
84			return *this;
85			}
86
87			operator T* () const { return ref ? static_cast<T*>(ref->ptr) : 0; }
88			T* operator->() const { return ref ? static_cast<T*>(ref->ptr) : 0; }
89			T* get() const { return ref ? static_cast<T*>(ref->ptr) : 0; }
90			};
91
92			typedef TokenRefCount<Token> RefToken;
93
94			#ifdef ANTLR_CXX_SUPPORTS_NAMESPACE
95			}
96			#endif
97
98			#endif //INC_TokenRefCount_hpp__