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/*++
Copyright (c) 2005 Microsoft Corporation
All rights reserved.
THIS CODE AND INFORMATION IS 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.
File Name:
cunknown.h
Abstract:
Provides a simple template implementation for classes that need to
implement IUnknown.
--*/
#pragma once
template <class _T>
class CUnknown : public _T
{
public:
/*++
Routine Name:
CUnknown
Routine Description:
CUnknown class constructor
Arguments:
IIDTarget - The target interface guid
Return Value:
None
--*/
CUnknown(
REFIID IIDTarget
) :
m_IIDTarget(IIDTarget),
m_cRef(1)
{
}
/*++
Routine Name:
~CUnknown
Routine Description:
CUnknown class destructor
Arguments:
None
Return Value:
None
--*/
virtual ~CUnknown()
{
}
//
// IUnknown methods
//
/*++
Routine Name:
QueryInterface
Routine Description:
This routine implements the IUnknown::QueryInterface method. Returns the raw interface
pointer for the requested IID if it matches the target IID
Arguments:
riid - The IID of the requested interface
ppv - The raw interface pointer
Return Value:
HRESULT
S_OK - On success
E_* - On error
--*/
virtual HRESULT STDMETHODCALLTYPE
QueryInterface(
REFIID riid,
_Out_ PVOID* ppv
)
{
HRESULT hr = S_OK;
if (ppv != NULL)
{
if (riid == IID_IUnknown ||
riid == m_IIDTarget)
{
*ppv = static_cast<_T*>(this);
}
else
{
*ppv = NULL;
hr = E_NOINTERFACE;
}
}
else
{
hr = E_POINTER;
}
if (SUCCEEDED(hr))
{
AddRef();
}
return hr;
}
/*++
Routine Name:
AddRef
Routine Description:
This routine increments the reference count on the current interface
Arguments:
None
Return Value:
HRESULT
S_OK - On success
E_* - On error
--*/
virtual ULONG STDMETHODCALLTYPE
AddRef()
{
return InterlockedIncrement(&m_cRef);
}
/*++
Routine Name:
Release
Routine Description:
This routine decrements the reference count on the current interface
Arguments:
None
Return Value:
HRESULT
S_OK - On success
E_* - On error
Notes:
The drv_at annotation tells Prefast to consider this object's memory
freed after Release has been called.
--*/
virtual
ULONG STDMETHODCALLTYPE
Release()
{
ULONG cRef = InterlockedDecrement(&m_cRef);
if (0 == cRef)
{
delete this;
}
return cRef;
}
private:
LONG m_cRef;
IID m_IIDTarget;
};
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