[apple/security.git] / OSX / libsecurity_codesigning / antlr2 / antlr / ASTRefCount.hpp

#ifndef INC_ASTRefCount_hpp__
# define INC_ASTRefCount_hpp__

/* ANTLR Translator Generator
 * Project led by Terence Parr at http://www.jGuru.com
 * Software rights: http://www.antlr.org/license.html
 *
 * $Id: //depot/code/org.antlr/release/antlr-2.7.7/lib/cpp/antlr/ASTRefCount.hpp#2 $
 */

# include <antlr/config.hpp>

#ifdef ANTLR_CXX_SUPPORTS_NAMESPACE
namespace antlr {
#endif

	class AST;

struct ANTLR_API ASTRef
{
	AST* const ptr;
	unsigned int count;

	ASTRef(AST* p);
	~ASTRef();
	ASTRef* increment()
	{
		++count;
		return this;
	}
	bool decrement()
	{
		return (--count==0);
	}

	static ASTRef* getRef(const AST* p);
private:
	ASTRef( const ASTRef& );
	ASTRef& operator=( const ASTRef& );
};

template<class T>
	class ANTLR_API ASTRefCount
{
private:
	ASTRef* ref;

public:
	ASTRefCount(const AST* p=0)
	: ref(p ? ASTRef::getRef(p) : 0)
	{
	}
	ASTRefCount(const ASTRefCount<T>& other)
	: ref(other.ref ? other.ref->increment() : 0)
	{
	}
	~ASTRefCount()
	{
		if (ref && ref->decrement())
			delete ref;
	}
	ASTRefCount<T>& operator=(AST* other)
	{
		ASTRef* tmp = ASTRef::getRef(other);

		if (ref && ref->decrement())
			delete ref;

		ref=tmp;

		return *this;
	}
	ASTRefCount<T>& operator=(const ASTRefCount<T>& other)
	{
		if( other.ref != ref )
		{
			ASTRef* tmp = other.ref ? other.ref->increment() : 0;

			if (ref && ref->decrement())
				delete ref;

			ref=tmp;
		}
		return *this;
	}

	operator T* ()  const { return ref ? static_cast<T*>(ref->ptr) : 0; }
	T* operator->() const { return ref ? static_cast<T*>(ref->ptr) : 0; }
	T* get()        const { return ref ? static_cast<T*>(ref->ptr) : 0; }
};

typedef ASTRefCount<AST> RefAST;

#ifdef ANTLR_CXX_SUPPORTS_NAMESPACE
}
#endif

#endif //INC_ASTRefCount_hpp__
Commit	Line	Data
427c49bc A	1	#ifndef INC_ASTRefCount_hpp__
	2	# define INC_ASTRefCount_hpp__
	3
	4	/* ANTLR Translator Generator
	5	* Project led by Terence Parr at http://www.jGuru.com
	6	* Software rights: http://www.antlr.org/license.html
	7	*
	8	* $Id: //depot/code/org.antlr/release/antlr-2.7.7/lib/cpp/antlr/ASTRefCount.hpp#2 $
	9	*/
	10
	11	# include <antlr/config.hpp>
	12
	13	#ifdef ANTLR_CXX_SUPPORTS_NAMESPACE
	14	namespace antlr {
	15	#endif
	16
	17	class AST;
	18
	19	struct ANTLR_API ASTRef
	20	{
	21	AST* const ptr;
	22	unsigned int count;
	23
	24	ASTRef(AST* p);
	25	~ASTRef();
	26	ASTRef* increment()
	27	{
	28	++count;
	29	return this;
	30	}
	31	bool decrement()
	32	{
	33	return (--count==0);
	34	}
	35
	36	static ASTRef* getRef(const AST* p);
	37	private:
	38	ASTRef( const ASTRef& );
	39	ASTRef& operator=( const ASTRef& );
	40	};
	41
	42	template<class T>
	43	class ANTLR_API ASTRefCount
	44	{
	45	private:
	46	ASTRef* ref;
	47
	48	public:
	49	ASTRefCount(const AST* p=0)
	50	: ref(p ? ASTRef::getRef(p) : 0)
	51	{
	52	}
	53	ASTRefCount(const ASTRefCount<T>& other)
	54	: ref(other.ref ? other.ref->increment() : 0)
	55	{
	56	}
	57	~ASTRefCount()
	58	{
	59	if (ref && ref->decrement())
	60	delete ref;
	61	}
	62	ASTRefCount<T>& operator=(AST* other)
	63	{
	64	ASTRef* tmp = ASTRef::getRef(other);
65
66	if (ref && ref->decrement())
67	delete ref;
68
69	ref=tmp;
70
71	return *this;
72	}
73	ASTRefCount<T>& operator=(const ASTRefCount<T>& other)
74	{
75	if( other.ref != ref )
76	{
77	ASTRef* tmp = other.ref ? other.ref->increment() : 0;
78
79	if (ref && ref->decrement())
80	delete ref;
81
82	ref=tmp;
83	}
84	return *this;
85	}
86
87	operator T* () const { return ref ? static_cast<T*>(ref->ptr) : 0; }
88	T* operator->() const { return ref ? static_cast<T*>(ref->ptr) : 0; }
89	T* get() const { return ref ? static_cast<T*>(ref->ptr) : 0; }
90	};
91
92	typedef ASTRefCount<AST> RefAST;
93
94	#ifdef ANTLR_CXX_SUPPORTS_NAMESPACE
95	}
96	#endif
97
98	#endif //INC_ASTRefCount_hpp__