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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