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#ifndef INC_TokenRefCount_hpp__
# define INC_TokenRefCount_hpp__
/* ANTLR Translator Generator
* Project led by Terence Parr at http://www.jGuru.com
* Software rights: http://www.antlr.org/license.html
*
* $Id:$
*/
# include <antlr/config.hpp>
#ifdef ANTLR_CXX_SUPPORTS_NAMESPACE
namespace antlr {
#endif
class Token;
struct ANTLR_API TokenRef
{
Token* const ptr;
unsigned int count;
TokenRef(Token* p);
~TokenRef();
TokenRef* increment()
{
++count;
return this;
}
bool decrement()
{
return (--count==0);
}
static TokenRef* getRef(const Token* p);
private:
TokenRef( const TokenRef& );
TokenRef& operator=( const TokenRef& );
};
template<class T>
class ANTLR_API TokenRefCount
{
private:
TokenRef* ref;
public:
TokenRefCount(const Token* p=0)
: ref(p ? TokenRef::getRef(p) : 0)
{
}
TokenRefCount(const TokenRefCount<T>& other)
: ref(other.ref ? other.ref->increment() : 0)
{
}
~TokenRefCount()
{
if (ref && ref->decrement())
delete ref;
}
TokenRefCount<T>& operator=(Token* other)
{
TokenRef* tmp = TokenRef::getRef(other);
if (ref && ref->decrement())
delete ref;
ref=tmp;
return *this;
}
TokenRefCount<T>& operator=(const TokenRefCount<T>& other)
{
if( other.ref != ref )
{
TokenRef* 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 TokenRefCount<Token> RefToken;
#ifdef ANTLR_CXX_SUPPORTS_NAMESPACE
}
#endif
#endif //INC_TokenRefCount_hpp__
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