86 lines
3 KiB
C++
86 lines
3 KiB
C++
//+---------------------------------------------------------------------------
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//
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// Microsoft Windows
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// Copyright (C) 1992, Microsoft Corporation.
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//
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// File: otrack.hxx
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//
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// Contents: This file defines facilities for a standard implementation
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// of reference-counted objects, incorporating mechanisms for
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// tracking the usage history of the objects.
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//
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// Classes: ObjectTracker
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//
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// History: 6-Apr-92 MikeSe Created
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//
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//----------------------------------------------------------------------------
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#ifndef __OTRACK_HXX__
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#define __OTRACK_HXX__
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#include <windows.h>
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//+-------------------------------------------------------------------------
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//
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// Class: ObjectTracker (otr)
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//
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// Purpose: Provides basis for tracking (OLE) objects (aka interface handles)
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//
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// History: 6-Apr-92 MikeSe Created
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//
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// Notes: Access to this class is only indirect, through the macros
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// defined later.
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//
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//--------------------------------------------------------------------------
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class ObjectTracker
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{
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protected:
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ObjectTracker();
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ULONG _cReferences;
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};
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//+-------------------------------------------------------------------------
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//
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// The following macros encapsulate use of the above
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//
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// INHERIT_TRACKING:
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//
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// For any class which implements a Cairo interface, add this macro
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// in the class declaration, eg:
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//
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// class CMyFoo: INHERIT_TRACKING, IFoo
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//
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// Do not repeat this in any subclass. If both INHERIT_UNWIND and
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// INHERIT_TRACKING are used, the former should appear first.
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# define INHERIT_TRACKING protected ObjectTracker
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inline ObjectTracker::ObjectTracker():_cReferences(1) {};
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# define DECLARE_STD_REFCOUNTING \
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STDMETHOD_(ULONG, AddRef) () \
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{ \
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InterlockedIncrement((long*)&_cReferences); \
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return _cReferences; \
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}; \
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STDMETHOD_(ULONG, Release) () \
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{ \
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if ( InterlockedDecrement((long*)&_cReferences) == 0 ) \
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{ \
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delete this; \
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return 0; \
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} \
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else \
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return _cReferences; \
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};
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# define ENLIST_TRACKING(cls)
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# define DUMP_TRACKING_INFO()
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# define TRACK_CLASS(fTrack, cls)
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#endif // of ifndef __OTRACK_HXX__
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