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/*
* Copyright (C) 2007-2008 Xagasoft, All rights reserved.
*
* This file is part of the libbu++ library and is released under the
* terms of the license contained in the file LICENSE.
*/
#ifndef BU_SPTR_H
#define BU_SPTR_H
#include <stdint.h>
#include <stdio.h>
namespace Bu
{
template<typename T> class SPtr;
template< typename Tb, typename Ta > SPtr<Tb> SPtrCast( SPtr<Ta> src );
/**
*@ingroup Containers
*/
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 )
{
if( pData )
{
pRefCnt = new int32_t;
(*pRefCnt) = 1;
}
}
/**
* Get the number of references to this pointer.
*@returns (int32_t) The number of references to this pointer.
*/
int32_t count() const
{
return *pRefCnt;
}
/**
* Pointer access operator.
*@returns (const T *)
*/
const T *operator->() const
{
return pData;
}
/**
* Dereference operator.
*@returns (const T &) The value at the end of the pointer.
*/
const T &operator*() const
{
return *pData;
}
/**
* Pointer access operator.
*@returns (T *)
*/
T *operator->()
{
return pData;
}
/**
* Dereference operator.
*@returns (T &) The value at the end of the pointer.
*/
T &operator*()
{
return *pData;
}
/**
* Assignment operator.
*@param src (const SPtr<T> &)
*/
SPtr<T> operator=( const SPtr<T> &src )
{
decCount();
pRefCnt = src.pRefCnt;
pData = src.pData;
if( pRefCnt )
(*pRefCnt) += 1;
return *this;
}
/**
* Assignment operator.
*@param src (const SPtr<T> &)
*/
const SPtr<T> operator=( const SPtr<T> &src ) const
{
decCount();
pRefCnt = src.pRefCnt;
pData = src.pData;
if( pRefCnt )
(*pRefCnt) += 1;
return *this;
}
/**
* Equals comparison operator.
*@param src (const SPtr<T> &) The SPtr to compare to.
*@returns (bool) Are the equal?
*/
bool operator==( const SPtr<T> &src ) const
{
return pData == src.pData;
}
/**
* Equals comparison operator.
*@param src (const T *) The pointer to compare to.
*@returns (bool) Are the equal?
*/
bool operator==( const T *src ) const
{
return pData == src;
}
/**
* Not equals comparison operator.
*@param src (const SPtr<T> &) The SPtr to compare to.
*@returns (bool) Are the equal?
*/
bool operator!=( const SPtr<T> &src ) const
{
return !(pData == src.pData);
}
/**
* Not equals comparison operator.
*@param src (const T *) The pointer to compare to.
*@returns (bool) Are the equal?
*/
bool operator!=( const T *src ) const
{
return !(pData == src);
}
/**
* Boolean cast operator. Do we have a pointer?
*/
operator bool() const
{
return pRefCnt != NULL;
}
/**
* Do we have a pointer?
*@returns (bool) Do we have a pointer?
*/
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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