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81 lines
1.3 KiB
81 lines
1.3 KiB
#ifndef INC_RefCount_h__
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#define INC_RefCount_h__
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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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* $Id$
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*/
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#include <antlr/config.h>
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#ifdef ANTLR_CXX_SUPPORTS_NAMESPACE
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namespace antlr {
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#endif
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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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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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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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operator T* () const
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{
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return ref ? ref->ptr : 0;
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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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T* get() const
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{
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return ref ? ref->ptr : 0;
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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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#ifdef ANTLR_CXX_SUPPORTS_NAMESPACE
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}
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#endif
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#endif //INC_RefCount_h__
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