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
#	Content
1	#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__