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#ifndef INC_ASTRefCount_hpp__ |
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# define INC_ASTRefCount_hpp__ |
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|
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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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|
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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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class AST; |
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|
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struct ANTLR_API ASTRef |
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{ |
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AST* const ptr; |
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unsigned int count; |
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|
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ASTRef(AST* p); |
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~ASTRef(); |
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ASTRef* increment() |
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{ |
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++count; |
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return this; |
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} |
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bool decrement() |
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{ |
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return (--count==0); |
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} |
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|
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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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|
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template<class T> |
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class ANTLR_API ASTRefCount |
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{ |
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private: |
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ASTRef* ref; |
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|
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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()) |
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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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|
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if (ref && ref->decrement()) |
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delete ref; |
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|
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ref=tmp; |
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|
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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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if( other.ref != ref ) |
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{ |
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ASTRef* tmp = other.ref ? other.ref->increment() : 0; |
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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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ref=tmp; |
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} |
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return *this; |
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} |
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|
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operator T* () const { return ref ? static_cast<T*>(ref->ptr) : 0; } |
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T* operator->() const { return ref ? static_cast<T*>(ref->ptr) : 0; } |
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T* get() const { return ref ? static_cast<T*>(ref->ptr) : 0; } |
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}; |
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|
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typedef ASTRefCount<AST> RefAST; |
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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_ASTRefCount_hpp__ |
