blob: 889ecc9d757870c97fc3c829f2eaaf6ba61b34dd (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
|
#ifndef INC_ASTRefCount_h__
# define INC_ASTRefCount_h__
/* ANTLR Translator Generator
* Project led by Terence Parr at http://www.jGuru.com
* Software rights: http://www.antlr.org/license.html
*
* $Id$
*/
# include <antlr/config.h>
#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_h__
|