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//+--------------------------------------------------------------------------
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
// This source code is intended only as a supplement to Microsoft
// Development Tools and/or on-line documentation. See these other
// materials for detailed information regarding Microsoft code samples.
//
// THIS CODE AND INFORMATION ARE PROVIDED AS IS WITHOUT WARRANTY OF ANY
// KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR PURPOSE.
//
// Abstract:
// WDK print filter sample.
// This file contains a smart pointer implementation.
//
//----------------------------------------------------------------------------
#ifndef __SAMPLE_SMART_PTR_HXX__
#define __SAMPLE_SMART_PTR_HXX__
namespace Tools
{
template<class T>
inline
void
SmartAddRef(
T *pInterface
) throw()
{
if (pInterface)
{
pInterface->AddRef();
}
}
template<class T>
inline
void
SmartRelease(
T **ppInterface
) throw()
{
if (*ppInterface)
{
(*ppInterface)->Release();
*ppInterface = NULL;
}
}
template<class T>
class SmartPtr
{
public:
inline
SmartPtr(
void
) throw() : m_Pointer(NULL)
{
}
inline
SmartPtr(
_In_opt_ T *pointer
) throw()
: m_Pointer(pointer)
{
SmartAddRef(m_Pointer);
}
inline
SmartPtr(
_In_ const SmartPtr ©
) throw()
{
m_Pointer = copy.m_Pointer;
SmartAddRef(m_Pointer);
}
inline
~SmartPtr(
void
) throw()
{
SmartRelease(&m_Pointer);
}
inline
SmartPtr &
operator=(
_In_opt_ T *pointer
) throw()
{
T *temp = m_Pointer;
m_Pointer = pointer;
SmartAddRef(m_Pointer);
SmartRelease(&temp);
return *this;
}
inline
SmartPtr &
operator=(
_In_ const SmartPtr ©
) throw()
{
T *temp = m_Pointer;
m_Pointer = copy.m_Pointer;
SmartAddRef(m_Pointer);
SmartRelease(&temp);
return *this;
}
inline
operator T *() throw()
{
return m_Pointer;
}
inline
operator const T *() const throw()
{
return m_Pointer;
}
inline
T **
operator&() throw()
{
return &m_Pointer;
}
inline
const T **
operator&() const throw()
{
return &m_Pointer;
}
inline
T *
operator->() throw()
{
return m_Pointer;
}
inline
const T *
operator->(
) const throw()
{
return m_Pointer;
}
inline
void
Attach(
_In_opt_ T *pointer
) throw()
{
T *temp = m_Pointer;
m_Pointer = pointer;
SmartRelease(&temp);
}
inline
T *
Detach(
void
) throw()
{
T *pTemp = m_Pointer;
m_Pointer = NULL;
return pTemp;
}
inline
void
Clear(
void
) throw()
{
SmartRelease(&m_Pointer);
}
private:
T *m_Pointer;
};
///////////////////////////////////////////////////////////////////////////////
class SmartBSTR
{
public:
SmartBSTR() throw()
: m_bstr (NULL)
{
}
~SmartBSTR() throw()
{
::SysFreeString(m_bstr);
}
operator BSTR() const throw()
{
return m_bstr;
}
BSTR*
operator&() throw()
{
return &m_bstr;
}
private:
BSTR m_bstr;
};
}; // namespace tools
#endif
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