src/antlr/ASTRefCount.hpp

#ifndef INC_ASTRefCount_hpp__
# define INC_ASTRefCount_hpp__

/* ANTLR Translator Generator
 * Project led by Terence Parr at http://www.jGuru.com
 * Software rights: http://www.antlr.org/license.html
 *
 * $Id: ASTRefCount.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 AST;

struct ANTLR_API ASTRef
{
        AST* const ptr;
        unsigned int count;

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

        static ASTRef* getRef(const AST* p);
private:
        ASTRef( const ASTRef& );
        ASTRef& operator=( const ASTRef& );
};

template<class T>
        class ANTLR_API ASTRefCount
{
private:
        ASTRef* ref;

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

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

                ref=tmp;

                return *this;
        }
        ASTRefCount<T>& operator=(const ASTRefCount<T>& other)
        {
                if( other.ref != ref )
                {
                        ASTRef* 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 ASTRefCount<AST> RefAST;

#ifdef ANTLR_CXX_SUPPORTS_NAMESPACE
}
#endif

#endif //INC_ASTRefCount_hpp__
Revision:	2469
Committed:	Fri Dec 2 15:38:03 2005 UTC (18 years, 7 months ago) by tim
File size:	1715 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_ASTRefCount_hpp__
2			# define INC_ASTRefCount_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: ASTRefCount.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 AST;
18
19			struct ANTLR_API ASTRef
20			{
21			AST* const ptr;
22			unsigned int count;
23
24			ASTRef(AST* p);
25			~ASTRef();
26			ASTRef* increment()
27			{
28			++count;
29			return this;
30			}
31			bool decrement()
32			{
33			return (--count==0);
34			}
35
36			static ASTRef* getRef(const AST* p);
37			private:
38			ASTRef( const ASTRef& );
39			ASTRef& operator=( const ASTRef& );
40			};
41
42			template<class T>
43			class ANTLR_API ASTRefCount
44			{
45			private:
46			ASTRef* ref;
47
48			public:
49			ASTRefCount(const AST* p=0)
50			: ref(p ? ASTRef::getRef(p) : 0)
51			{
52			}
53			ASTRefCount(const ASTRefCount<T>& other)
54			: ref(other.ref ? other.ref->increment() : 0)
55			{
56			}
57			~ASTRefCount()
58			{
59			if (ref && ref->decrement())
60			delete ref;
61			}
62			ASTRefCount<T>& operator=(AST* other)
63			{
64			ASTRef* tmp = ASTRef::getRef(other);
65
66			if (ref && ref->decrement())
67			delete ref;
68
69			ref=tmp;
70
71			return *this;
72			}
73			ASTRefCount<T>& operator=(const ASTRefCount<T>& other)
74			{
75			if( other.ref != ref )
76			{
77			ASTRef* 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 ASTRefCount<AST> RefAST;
93
94			#ifdef ANTLR_CXX_SUPPORTS_NAMESPACE
95			}
96			#endif
97
98			#endif //INC_ASTRefCount_hpp__