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1 #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 * $Id:$
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__