113 lines
3 KiB
C++
113 lines
3 KiB
C++
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// --------------------------------------------------------------------------
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// Module Name: CountedObjects.cpp
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//
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// Copyright (c) 1999-2000, Microsoft Corporation
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//
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// Base class that implements object reference counting
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//
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// History: 1999-08-17 vtan created
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// 2000-02-01 vtan moved from Neptune to Whistler
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// --------------------------------------------------------------------------
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#include "StandardHeader.h"
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#include "CountedObject.h"
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// --------------------------------------------------------------------------
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// CCountedObject::CCountedObject
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//
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// Arguments: <none>
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//
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// Returns: <none>
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//
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// Purpose: Initializes the reference count to 1.
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//
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// History: 1999-08-17 vtan created
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// --------------------------------------------------------------------------
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CCountedObject::CCountedObject (void) :
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_lReferenceCount(1),
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_fReleased(false)
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{
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}
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// --------------------------------------------------------------------------
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// CCountedObject::~CCountedObject
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//
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// Arguments: <none>
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//
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// Returns: <none>
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//
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// Purpose: Virtual destructor that just checks valid deletion.
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//
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// History: 1999-08-17 vtan created
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// --------------------------------------------------------------------------
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CCountedObject::~CCountedObject (void)
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{
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ASSERTMSG(_fReleased, "CCountedObject::~CCountedObject invoked without being released");
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}
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// --------------------------------------------------------------------------
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// CCountedObject::AddRef
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//
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// Arguments: <none>
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//
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// Returns: <none>
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//
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// Purpose: Increments the object's reference count.
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//
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// History: 1999-08-17 vtan created
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// --------------------------------------------------------------------------
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void CCountedObject::AddRef (void)
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{
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InterlockedIncrement(&_lReferenceCount);
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}
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// --------------------------------------------------------------------------
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// CCountedObject::Release
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//
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// Arguments: <none>
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//
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// Returns: <none>
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//
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// Purpose: Decrements the object's reference count. When the count
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// reaches zero the object is deleted. Do NOT use referenced
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// objects when using stack based objects. These must be
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// dynamically allocated.
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//
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// History: 1999-08-17 vtan created
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// --------------------------------------------------------------------------
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void CCountedObject::Release (void)
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{
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if (InterlockedDecrement(&_lReferenceCount) == 0)
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{
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_fReleased = true;
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delete this;
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}
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}
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// --------------------------------------------------------------------------
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// CCountedObject::GetCount
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//
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// Arguments: <none>
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//
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// Returns: LONG
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//
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// Purpose: Returns the count of outstanding references on the object.
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//
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// History: 2000-07-17 vtan created
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// --------------------------------------------------------------------------
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LONG CCountedObject::GetCount (void) const
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{
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return(_lReferenceCount);
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}
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