javauis/m2g_akn/inc/JcfAutoPtr.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Tue, 27 Apr 2010 16:30:29 +0300
branchRCL_3
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permissions -rw-r--r--
Revision: v2.1.22 Kit: 201017
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/*
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* Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).
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* All rights reserved.
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* This component and the accompanying materials are made available
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* under the terms of "Eclipse Public License v1.0"
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* which accompanies this distribution, and is available
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".
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*
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* Initial Contributors:
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* Nokia Corporation - initial contribution.
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*
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* Contributors:
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*
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* Description:
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*
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*/
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#ifndef JCFAUTOPTR_H
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#define JCFAUTOPTR_H
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#include <e32base.h>
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/**
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 * Functionality of this auto ptr class is same as stl's auto_ptr class
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 * except this works with cleanup stack.
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 * Implementation of the example operation with "traditional" way:
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 * void bar()
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 *   {
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 *   CFoo* myFoo = CFoo::NewL();
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 *   CleanupStack::PushL(myFoo);
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 *   myFoo->DoSomeThingL();
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 *   CleanupStack::PopAndDestroy(1); //myFoo
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 *   }
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 * Implementation of the same function with auto pointer class:
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 * void bar()
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 *   {
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 *   jcfcommon::auto_ptr<CFoo> myFoo(CFoo::NewL());
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 *   myFoo->DoSomeThingL();
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 *   }
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 *
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 */
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namespace jcfcommon
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{
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template<class X> class auto_ptr
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{
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public:
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    typedef X element_type;
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    auto_ptr(X* aPtr = 0): iPtr(aPtr),iCloseCalledFlag(EFalse)
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    {
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        CleanupStack::PushL(TCleanupItem(Close, (void*)this));
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    }
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    /**
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     * Copy constructor was commented out because current
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     * implementation doesn't support situation where auto_ptr
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     * is returned as return value of the function. Problem is that
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     * orig. auto_ptr is deleted when getBar() operation has been
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     * executed and this deleted local reference has been stored to the
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     * cleanup stack.
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     * E.g:
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     * void foo()
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     *   {
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     *   auto_ptr<bar> barObj = getBar();
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     *       .
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     *       .
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     *       .
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     *   User::Leave(KErrNotFound);
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     *   }
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     */
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    /*auto_ptr(auto_ptr& aPtr): iPtr(aPtr.release())
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    {
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      CleanupStack::PushL(TCleanupItem(Close, (void*)this));
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    }*/
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    auto_ptr<X>& operator=(auto_ptr<X>& aRhs)
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    {
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        if (&aRhs != this)
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        {
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            delete iPtr;
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            iPtr = aRhs.release();
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        }
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        return (*this);
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    }
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    ~auto_ptr()
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    {
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        if (!iCloseCalledFlag)
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        {
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            CleanupStack::Pop();
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            delete iPtr;
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        }
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    }
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    X& operator *() const
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    {
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        return *iPtr;
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    }
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    X* operator ->() const
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    {
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        return iPtr;
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    }
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    X* get() const
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    {
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        return iPtr;
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    }
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    X* release()
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    {
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        X* result = iPtr;
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        iPtr = 0;
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        return result;
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    }
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    void reset(X* aPtr = 0)
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    {
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        if (aPtr != iPtr)
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        {
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            delete iPtr;
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            iPtr = aPtr;
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        }
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    }
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private:
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    static void Close(void* aPtr)
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    {
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        auto_ptr<X>* self = (auto_ptr<X>*)aPtr;
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        delete self->iPtr;
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        self->iPtr = 0;
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        self->iCloseCalledFlag = ETrue;
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    }
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    //Not implemented.
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    auto_ptr(auto_ptr& aPtr);
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private:
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    X* iPtr;
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    TBool iCloseCalledFlag;
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};
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}//end jcfcommon
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#endif // JCFAUTOPTR_H
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