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105 lines
2.7 KiB
105 lines
2.7 KiB
#ifndef INC_ASTRefCount_hpp__
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# define INC_ASTRefCount_hpp__
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/**
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* <b>SOFTWARE RIGHTS</b>
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* <p>
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* ANTLR 2.6.0 MageLang Insitute, 1999
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* <p>
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* We reserve no legal rights to the ANTLR--it is fully in the
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* public domain. An individual or company may do whatever
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* they wish with source code distributed with ANTLR or the
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* code generated by ANTLR, including the incorporation of
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* ANTLR, or its output, into commerical software.
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* <p>
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* We encourage users to develop software with ANTLR. However,
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* we do ask that credit is given to us for developing
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* ANTLR. By "credit", we mean that if you use ANTLR or
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* incorporate any source code into one of your programs
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* (commercial product, research project, or otherwise) that
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* you acknowledge this fact somewhere in the documentation,
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* research report, etc... If you like ANTLR and have
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* developed a nice tool with the output, please mention that
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* you developed it using ANTLR. In addition, we ask that the
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* headers remain intact in our source code. As long as these
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* guidelines are kept, we expect to continue enhancing this
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* system and expect to make other tools available as they are
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* completed.
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* <p>
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* The ANTLR gang:
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* @version ANTLR 2.6.0 MageLang Insitute, 1999
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* @author Terence Parr, <a href=http://www.MageLang.com>MageLang Institute</a>
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* @author <br>John Lilley, <a href=http://www.Empathy.com>Empathy Software</a>
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* @author <br><a href="mailto:pete@yamuna.demon.co.uk">Pete Wells</a>
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*/
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# include "antlr/config.h"
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ANTLR_BEGIN_NAMESPACE(antlr)
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class AST;
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struct ASTRef
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{
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AST* const ptr;
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unsigned int count;
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ASTRef(AST* p);
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~ASTRef();
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ASTRef* increment();
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bool decrement();
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static ASTRef* getRef(const AST* p);
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private:
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ASTRef( const ASTRef& );
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ASTRef& operator=( const ASTRef& );
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};
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template<class T>
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class ASTRefCount
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{
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private:
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ASTRef* ref;
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public:
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ASTRefCount(const AST* p=0)
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: ref(p ? ASTRef::getRef(p) : 0)
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{
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}
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ASTRefCount(const ASTRefCount<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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~ASTRefCount()
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{
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if (ref && ref->decrement()) delete ref;
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}
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ASTRefCount<T>& operator=(AST* other)
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{
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ASTRef* tmp=ASTRef::getRef(other);
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if (ref && ref->decrement()) delete ref;
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ref=tmp;
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return *this;
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}
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ASTRefCount<T>& operator=(const ASTRefCount<T>& other)
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{
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ASTRef* tmp=other.ref ? other.ref->increment() : 0;
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if (ref && ref->decrement()) 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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{ return ref ? static_cast<T*>(ref->ptr) : 0; }
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T* operator->() const
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{ return ref ? static_cast<T*>(ref->ptr) : 0; }
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T* get() const
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{ return ref ? static_cast<T*>(ref->ptr) : 0; }
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};
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typedef ASTRefCount<AST> RefAST;
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ANTLR_END_NAMESPACE
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#endif //INC_ASTRefCount_hpp__
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