118 lines
2.0 KiB
C++
118 lines
2.0 KiB
C++
/*
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*
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* Copyright (C) 1996-2011, OFFIS e.V.
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* All rights reserved. See COPYRIGHT file for details.
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*
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* This software and supporting documentation were developed by
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*
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* OFFIS e.V.
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* R&D Division Health
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* Escherweg 2
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* D-26121 Oldenburg, Germany
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*
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*
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* Module: dcmimgle
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*
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* Author: Joerg Riesmeier
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*
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* Purpose: DicomObjectCounter (Header)
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*
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*/
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#ifndef DIOBJCOU_H
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#define DIOBJCOU_H
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#include "dcmtk/config/osconfig.h"
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#ifdef WITH_THREADS
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#include "dcmtk/ofstd/ofthread.h"
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#endif
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#include "dcmtk/dcmimgle/didefine.h"
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/*---------------------*
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* class declaration *
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*---------------------*/
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/** Class to count number of instances (objects created from a certain class).
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* used to manage more than one reference to an object in a secure way.
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*/
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class DCMTK_DCMIMGLE_EXPORT DiObjectCounter
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{
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public:
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/** add a reference.
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* Increase the internal counter by 1.
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*/
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inline void addReference()
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{
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#ifdef WITH_THREADS
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theMutex.lock();
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#endif
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++Counter;
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#ifdef WITH_THREADS
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theMutex.unlock();
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#endif
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}
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/** remove a reference.
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* Decrease the internal counter by 1 and delete the object only if the counter is zero.
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*/
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inline void removeReference()
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{
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#ifdef WITH_THREADS
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theMutex.lock();
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#endif
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if (--Counter == 0)
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{
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#ifdef WITH_THREADS
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theMutex.unlock();
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#endif
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delete this;
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#ifdef WITH_THREADS
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} else {
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theMutex.unlock();
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#endif
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}
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}
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protected:
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/** constructor.
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* Internal counter is initialized with 1.
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*/
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DiObjectCounter()
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: Counter(1)
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#ifdef WITH_THREADS
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,theMutex()
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#endif
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{
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}
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/** destructor
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*/
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virtual ~DiObjectCounter()
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{
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}
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private:
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/// internal counter
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unsigned long Counter;
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#ifdef WITH_THREADS
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/** if compiled for multi-thread operation, the Mutex protecting
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* access to the value of this object.
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*/
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OFMutex theMutex;
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#endif
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};
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#endif
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