[1] | 1 | #ifndef INC_TokenRefCount_hpp__ |
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| 2 | # define INC_TokenRefCount_hpp__ |
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| 3 | |
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| 4 | /* ANTLR Translator Generator |
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| 5 | * Project led by Terence Parr at http://www.jGuru.com |
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| 6 | * Software rights: http://www.antlr.org/license.html |
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| 7 | * |
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| 8 | * $Id:$ |
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| 9 | */ |
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| 10 | |
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| 11 | # include <antlr/config.hpp> |
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| 12 | |
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| 13 | #ifdef ANTLR_CXX_SUPPORTS_NAMESPACE |
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| 14 | namespace antlr { |
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| 15 | #endif |
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| 16 | |
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| 17 | class Token; |
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| 18 | |
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| 19 | struct ANTLR_API TokenRef |
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| 20 | { |
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| 21 | Token* const ptr; |
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| 22 | unsigned int count; |
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| 23 | |
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| 24 | TokenRef(Token* p); |
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| 25 | ~TokenRef(); |
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| 26 | TokenRef* increment() |
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| 27 | { |
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| 28 | ++count; |
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| 29 | return this; |
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| 30 | } |
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| 31 | bool decrement() |
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| 32 | { |
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| 33 | return (--count==0); |
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| 34 | } |
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| 35 | |
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| 36 | static TokenRef* getRef(const Token* p); |
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| 37 | private: |
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| 38 | TokenRef( const TokenRef& ); |
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| 39 | TokenRef& operator=( const TokenRef& ); |
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| 40 | }; |
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| 41 | |
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| 42 | template<class T> |
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| 43 | class ANTLR_API TokenRefCount |
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| 44 | { |
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| 45 | private: |
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| 46 | TokenRef* ref; |
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| 47 | |
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| 48 | public: |
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| 49 | TokenRefCount(const Token* p=0) |
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| 50 | : ref(p ? TokenRef::getRef(p) : 0) |
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| 51 | { |
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| 52 | } |
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| 53 | TokenRefCount(const TokenRefCount<T>& other) |
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| 54 | : ref(other.ref ? other.ref->increment() : 0) |
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| 55 | { |
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| 56 | } |
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| 57 | ~TokenRefCount() |
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| 58 | { |
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| 59 | if (ref && ref->decrement()) |
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| 60 | delete ref; |
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| 61 | } |
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| 62 | TokenRefCount<T>& operator=(Token* other) |
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| 63 | { |
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| 64 | TokenRef* tmp = TokenRef::getRef(other); |
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| 65 | |
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| 66 | if (ref && ref->decrement()) |
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| 67 | delete ref; |
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| 68 | |
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| 69 | ref=tmp; |
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| 70 | |
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| 71 | return *this; |
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| 72 | } |
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| 73 | TokenRefCount<T>& operator=(const TokenRefCount<T>& other) |
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| 74 | { |
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| 75 | if( other.ref != ref ) |
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| 76 | { |
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| 77 | TokenRef* tmp = other.ref ? other.ref->increment() : 0; |
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| 78 | |
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| 79 | if (ref && ref->decrement()) |
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| 80 | delete ref; |
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| 81 | |
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| 82 | ref=tmp; |
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| 83 | } |
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| 84 | return *this; |
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| 85 | } |
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| 86 | |
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| 87 | operator T* () const { return ref ? static_cast<T*>(ref->ptr) : 0; } |
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| 88 | T* operator->() const { return ref ? static_cast<T*>(ref->ptr) : 0; } |
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| 89 | T* get() const { return ref ? static_cast<T*>(ref->ptr) : 0; } |
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| 90 | }; |
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| 91 | |
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| 92 | typedef TokenRefCount<Token> RefToken; |
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| 93 | |
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| 94 | #ifdef ANTLR_CXX_SUPPORTS_NAMESPACE |
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| 95 | } |
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| 96 | #endif |
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| 97 | |
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| 98 | #endif //INC_TokenRefCount_hpp__ |
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