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#ifndef INC_RefCount_hpp__ |
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#define INC_RefCount_hpp__ |
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/* ANTLR Translator Generator |
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* Project led by Terence Parr at http://www.jGuru.com |
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* Software rights: http://www.antlr.org/license.html |
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* |
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* $Id: RefCount.hpp,v 1.1 2005-12-02 15:38:02 tim Exp $ |
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*/ |
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|
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#include <antlr/config.hpp> |
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|
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#ifdef ANTLR_CXX_SUPPORTS_NAMESPACE |
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namespace antlr { |
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#endif |
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|
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template<class T> |
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class ANTLR_API RefCount { |
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private: |
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struct Ref { |
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T* const ptr; |
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unsigned int count; |
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|
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Ref(T* p) : ptr(p), count(1) {} |
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~Ref() {delete ptr;} |
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Ref* increment() {++count;return this;} |
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bool decrement() {return (--count==0);} |
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private: |
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Ref(const Ref&); |
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Ref& operator=(const Ref&); |
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}* ref; |
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|
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public: |
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explicit RefCount(T* p = 0) |
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: ref(p ? new Ref(p) : 0) |
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{ |
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} |
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RefCount(const RefCount<T>& other) |
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: ref(other.ref ? other.ref->increment() : 0) |
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{ |
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} |
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~RefCount() |
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{ |
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if (ref && ref->decrement()) |
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delete ref; |
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} |
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RefCount<T>& operator=(const RefCount<T>& other) |
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{ |
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Ref* tmp = other.ref ? other.ref->increment() : 0; |
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if (ref && ref->decrement()) |
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delete ref; |
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ref = tmp; |
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return *this; |
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} |
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|
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operator T* () const |
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{ |
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return ref ? ref->ptr : 0; |
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} |
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|
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T* operator->() const |
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{ |
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return ref ? ref->ptr : 0; |
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} |
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|
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T* get() const |
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{ |
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return ref ? ref->ptr : 0; |
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} |
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|
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template<class newType> operator RefCount<newType>() |
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{ |
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return RefCount<newType>(ref); |
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} |
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}; |
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|
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#ifdef ANTLR_CXX_SUPPORTS_NAMESPACE |
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} |
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#endif |
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|
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#endif //INC_RefCount_hpp__ |
