hxsmartptr.h

著名的 helix realplayer 基于手机 symbian 系统的 播放器全套源代码

	HX_PRIVATE_SMART_POINTER_INLINE( CLASS_NAME, IUnknown, HX_PRIVATE_BLANK, HX_PRIVATE_BLANK )

/*!
    @defined HX_IUNKNOWN_CONST_SMART_POINTER_INLINE
    @abstract 
	Declare a const smart pointer of name CLASS_NAME which points to an 
	IUnknown interface. Inline definitions of all functions.
*/
#define HX_IUNKNOWN_CONST_SMART_POINTER_INLINE( CLASS_NAME )		\
	HX_PRIVATE_SMART_POINTER_INLINE( CLASS_NAME, IUnknown, const, HX_PRIVATE_BLANK )




// ---------------------------------------------------------------------
// The macros below here should not be used directly. They might 
// change in future implementations
// ---------------------------------------------------------------------


// The IUnknown functions macros have been included 
// to reduce code duplication. If we just attempt to use the normal 
// macros for creating an IUnknown smart pointer we end up with compile 
// errors because the copy constructor and assignment ops are duplicated.
// The HX_PRIVATE_NON_IUNKNOWN_FUNCTIONS macro separates out a copy 
// constructor / assignment op that are needed in the non-IUnknown versions 
// but would cause errors in the IUnknown versions.

#define HX_PRIVATE_NON_IUNKNOWN_FUNCTIONS( CLASS_NAME, INTERFACE, QUALIFIERS )		\
    CLASS_NAME(INTERFACE QUALIFIERS* pact)						\
    : pActual(NULL)									\
    {											\
	if( pact )									\
	{										\
	    pActual = (INTERFACE*) pact;						\
	    pActual->AddRef();								\
	}										\
    }											\
    CLASS_NAME& operator =( INTERFACE QUALIFIERS* pNew )				\
    {											\
	if( pNew != pActual )								\
	{										\
	    INTERFACE* pTemp = pActual;							\
	    pActual = (INTERFACE*) pNew;						\
	    if( pActual )								\
	    {										\
		pActual->AddRef();							\
	    }										\
	    HX_RELEASE( pTemp );							\
	}										\
	return *this;									\
    }											\


#define HX_PRIVATE_SMART_POINTER_INLINE( CLASS_NAME, INTERFACE, QUALIFIERS, NON_IUNKNOWN_DEFINITIONS )	\
											\
class CLASS_NAME									\
{											\
public:											\
    CLASS_NAME()									\
	: pActual(NULL)									\
    {}											\
											\
    CLASS_NAME( const CLASS_NAME& rspact )						\
    : pActual(NULL)									\
    {											\
	if( rspact.pActual )								\
	{										\
	    pActual = rspact.pActual;							\
	    pActual->AddRef();								\
	}										\
    }											\
											\
    CLASS_NAME(IUnknown QUALIFIERS* punk)						\
    : pActual(NULL)									\
    {											\
        if(punk)									\
	    ((IUnknown*) punk)->QueryInterface( IID_##INTERFACE, ( void** )( &pActual ) );		\
    }											\
    CLASS_NAME& operator =( IUnknown QUALIFIERS* punkNew )				\
    {											\
	if( punkNew != pActual )							\
	{										\
	    INTERFACE* pTemp = pActual;							\
	    if(punkNew)									\
	    {										\
		((IUnknown*) punkNew)->QueryInterface( IID_##INTERFACE, ( void** )( &pActual ) );	\
	    }										\
	    else									\
	    {										\
		pActual = NULL;								\
	    }										\
	    HX_RELEASE( pTemp );							\
	}										\
	return *this;									\
    }											\
											\
    CLASS_NAME( IHXCommonClassFactory* pIObjectSource, REFCLSID clsid, HX_RESULT* pResult = NULL ) \
    : pActual(NULL)									\
    {											\
	HX_ASSERT(pIObjectSource);							\
	IUnknown* pIUnk = NULL;								\
	HX_RESULT result = pIObjectSource->CreateInstance( clsid, (void**)&pIUnk );	\
	if (SUCCEEDED(result))								\
	{										\
	    HX_ASSERT(pIUnk);								\
	    result = pIUnk->QueryInterface( IID_##INTERFACE, ( void** )( &pActual ) );	\
	    pIUnk->Release();								\
	}										\
	if( pResult )									\
	{										\
	    *pResult = result;								\
	}										\
    }											\
											\
    NON_IUNKNOWN_DEFINITIONS								\
											\
    ~CLASS_NAME()									\
    { HX_RELEASE (pActual); }								\
											\
    class INTERFACE##_InternalSP : public INTERFACE					\
    {											\
    private:										\
	virtual ULONG32 STDMETHODCALLTYPE AddRef () PURE;				\
	virtual ULONG32 STDMETHODCALLTYPE Release () PURE;				\
    };											\
											\
    INTERFACE##_InternalSP QUALIFIERS* operator -> () const				\
    {HX_ASSERT(pActual);return (INTERFACE##_InternalSP*) pActual;}			\
											\
    INTERFACE##_InternalSP QUALIFIERS& operator * () const				\
    {HX_ASSERT(pActual);return *((INTERFACE##_InternalSP*) pActual);}			\
											\
    CLASS_NAME& operator =( const CLASS_NAME& rspact )					\
    {*this = rspact.pActual; return *this;}						\
											\
											\
										\
    HX_RESULT Query(IUnknown QUALIFIERS* punkNew)					\
    {											\
	HX_RESULT result = HXR_INVALID_PARAMETER;					\
	if( punkNew )									\
	{										\
	    result = HXR_OK;								\
	    if( punkNew != pActual )							\
	    {										\
		INTERFACE* pTemp = NULL;						\
		result = ((IUnknown*) punkNew)->QueryInterface( IID_##INTERFACE, ( void** )( &pTemp ) );	\
		if( SUCCEEDED( result ) )						\
		{									\
		    HX_RELEASE( pActual );						\
		    pActual = pTemp;							\
		}									\
	    }										\
	}										\
	return result;									\
    }											\
											\
    BOOL IsValid() const								\
    {return pActual!=NULL;}								\
											\
    INTERFACE** AsInOutParam () 							\
    { HX_RELEASE (pActual); return &pActual; }						\
											\
    INTERFACE QUALIFIERS* Ptr() const							\
    {return pActual;}									\
											\
    void AsPtr( INTERFACE QUALIFIERS** ppActual ) const					\
    {											\
	HX_ASSERT(pActual);								\
	pActual->AddRef ();								\
	*ppActual = pActual;								\
    }											\
											\
    void AsUnknown( IUnknown QUALIFIERS** ppIUnknown ) const				\
    {											\
	HX_ASSERT(pActual);								\
	pActual->QueryInterface								\
	(										\
	    IID_IUnknown,								\
	    ( void** )ppIUnknown							\
	);										\
    }											\
											\
    void Clear ()									\
    { HX_RELEASE (pActual); }								\
											\
private:										\
    INTERFACE*	    pActual;								\
}

#define HX_PRIVATE_BLANK

HX_IUNKNOWN_SMART_POINTER_INLINE( SPIUnknown );
HX_IUNKNOWN_CONST_SMART_POINTER_INLINE( SPCIUnknown );

// Since we are guaranteed that SPIUnknown and SPCIUnknown will be storing 
// the unique IUnknown pointer we can just compare the results of the Ptr function.

inline BOOL operator ==( const SPIUnknown& sp1, const SPIUnknown& sp2 )
{
    return sp1.Ptr() == sp2.Ptr();
}

inline BOOL operator ==( const SPCIUnknown& spc1, const SPCIUnknown& spc2 )
{
    return spc1.Ptr() == spc2.Ptr();
}

/* These cannot be activated without letting everybody know. Some code might
 fail to compile: 
 	IRCAClickable* p = 0;
 	if (p == SPIUnknown(p))  //is ambigous
 	{ ... }
 	
 	
inline BOOL operator ==( const SPIUnknown& sp1, const SPCIUnknown& spc2 )
{
    return sp1.Ptr() == spc2.Ptr();
}

inline BOOL operator ==( const SPCIUnknown& spc1, const SPIUnknown& sp2 )
{
    return spc1.Ptr() == sp2.Ptr();
}
*/

inline BOOL operator !=( const SPIUnknown& sp1, const SPIUnknown& sp2 )
{
    return ! ( sp1 == sp2 );
}

inline BOOL operator !=( const SPCIUnknown& spc1, const SPCIUnknown& spc2 )
{
    return ! ( spc1 == spc2 );
}

/*
inline BOOL operator !=( const SPIUnknown& sp1, const SPCIUnknown& spc2 )
{
    return ! ( sp1 == spc2 );
}

inline BOOL operator !=( const SPCIUnknown& spc1, const SPIUnknown& sp2 )
{
    return ! ( spc1 == sp2 );
}
*/
#endif // _HXSMARTPTR_H_