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#ifndef SPTR_H
#define SPTR_H
#include <stdint.h>
#include <stdio.h>
template<typename T> class SPtr;
template< typename Tb, typename Ta > SPtr<Tb> SPtrCast( SPtr<Ta> src );
template<typename T>
class SPtr
{
template<typename Tb, typename Ta>
friend SPtr<Tb> SPtrCast( SPtr<Ta> pt );
public:
SPtr() :
pRefCnt( NULL ),
pData( NULL )
{
}
~SPtr()
{
decCount();
}
SPtr( const SPtr<T> &src ) :
pRefCnt( src.pRefCnt ),
pData( src.pData )
{
if( pRefCnt )
(*pRefCnt) += 1;
}
SPtr( T *pSrc ) :
pRefCnt( NULL ),
pData( pSrc )
{
pRefCnt = new int32_t;
(*pRefCnt) = 1;
}
int32_t count() const
{
return *pRefCnt;
}
T *operator->() const
{
return pData;
}
T *operator*() const
{
return pData;
}
SPtr<T> operator=( const SPtr<T> &src )
{
decCount();
pRefCnt = src.pRefCnt;
pData = src.pData;
(*pRefCnt) += 1;
return *this;
}
const SPtr<T> operator=( const SPtr<T> &src ) const
{
decCount();
pRefCnt = src.pRefCnt;
pData = src.pData;
(*pRefCnt) += 1;
return *this;
}
bool operator==( const SPtr<T> &src ) const
{
return pData == src.pData;
}
operator bool() const
{
return pRefCnt != NULL;
}
bool isSet() const
{
return pRefCnt != NULL;
}
private:
void decCount() const
{
if( pRefCnt )
{
(*pRefCnt) -= 1;
//printf("Decrementing ref-count to %d\n", *pRefCnt );
if( (*pRefCnt) == 0 )
{
delete pRefCnt;
delete pData;
pRefCnt = NULL;
pData = NULL;
}
}
}
mutable int32_t *pRefCnt;
mutable T *pData;
};
template< typename Tb, typename Ta > SPtr<Tb> SPtrCast( SPtr<Ta> src )
{
SPtr<Tb> ret;
ret.pRefCnt = src.pRefCnt;
ret.pData = dynamic_cast<Tb *>(src.pData);
if( ret.pRefCnt )
(*(ret.pRefCnt)) += 1;
return ret;
}
#endif
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