132 lines
2.4 KiB
C
132 lines
2.4 KiB
C
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/////////////////////////////////////////////////////////////////////////////
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//
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// Copyright (c) 1998-1999 Microsoft Corporation
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//
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// Module Name:
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// SmartPointer.h
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//
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// Description:
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// Smart pointer template class
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//
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// Author:
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// Galen Barbee (galenb) 19-Oct-1998
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//
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// Revision History:
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//
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// Notes:
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//
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/////////////////////////////////////////////////////////////////////////////
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#ifndef __SMARTPOINTER_H__
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#define __SMARTPOINTER_H__
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/////////////////////////////////////////////////////////////////////////////
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//+++
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//
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// class: CSmartPtr
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//
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// Description:
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// This class template is used to encapsulate pointers to interfaces,
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// but in simpler way than com_ptr_t. We do not want exceptions
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// to be thrown on com errors (as com_ptr_t does) (except Release).
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// Instead, we want to process them on our own, yet still have an advantage
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// of proper cleaning upon destruction. Using it significantly simplifies
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// test code.
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//
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// Inheritance:
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// None.
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//---
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/////////////////////////////////////////////////////////////////////////////
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template< class T > class CSmartPtr
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{
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private:
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T * m_tPtr;
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void * operator new( size_t );
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void * operator new( size_t, void * );
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void operator delete( void * );
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public:
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__declspec(nothrow) CSmartPtr( T * ptr )
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{
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if ( ( m_tPtr = ptr) != NULL )
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{
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m_tPtr->AddRef();
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}
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}
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__declspec(nothrow) CSmartPtr( const CSmartPtr< T > * ptr )
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{
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if ( ( m_tPtr = ptr->m_tPtr ) != NULL )
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{
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m_tPtr->AddRef();
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}
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}
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__declspec(nothrow) CSmartPtr( void )
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{
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m_tPtr = NULL;
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}
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~CSmartPtr( void ) throw( _com_error )
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{
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if ( m_tPtr != NULL )
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{
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m_tPtr->Release();
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m_tPtr = NULL;
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}
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}
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__declspec(nothrow) T ** operator&() const
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{
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return &m_tPtr;
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}
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__declspec(nothrow) T * operator->() const
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{
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return m_tPtr;
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}
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__declspec(nothrow) operator T * () const
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{
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return m_tPtr;
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}
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__declspec(nothrow) T * operator=( T * ptr )
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{
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if ( m_tPtr != NULL )
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{
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m_tPtr->Release();
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m_tPtr = NULL;
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}
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if ( ( m_tPtr = ptr ) != NULL )
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{
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m_tPtr->AddRef();
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}
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return m_tPtr;
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}
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__declspec(nothrow) bool operator==( T * ptr ) const
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{
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return m_tPtr == ptr;
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}
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__declspec(nothrow) bool operator!=( T * ptr ) const
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{
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return m_tPtr != ptr;
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}
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//
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// This is the only non-conforming operator in this class.
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//
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__declspec(nothrow) T * operator*() const
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{
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return m_tPtr;
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}
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}; //*** Class CSmartPtr
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#endif // __SMARTPOINTER_H__
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