Symbian3/PDK/Source/GUID-F686965A-13E5-5C0A-AED1-55EC91C79433.dita
author Dominic Pinkman <dominic.pinkman@nokia.com>
Fri, 13 Aug 2010 16:47:46 +0100
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<?xml version="1.0" encoding="utf-8"?>
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<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. -->
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<!-- This component and the accompanying materials are made available under the terms of the License 
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"Eclipse Public License v1.0" which accompanies this distribution, 
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and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". -->
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<!-- Initial Contributors:
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    Nokia Corporation - initial contribution.
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Contributors: 
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-->
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<!DOCTYPE concept
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  PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
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<concept id="GUID-F686965A-13E5-5C0A-AED1-55EC91C79433" xml:lang="en"><title>Restrictions
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on the use of leaves and TRAPs in destructors</title><shortdesc>Outlines the restrictions on the use of leaves and TRAPs in destructors.</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>
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<p>You <i>cannot</i> use <xref href="GUID-3F2CDC74-2568-371C-9D8E-34A66A619226.dita"><apiname>TRAP</apiname></xref> (and <xref href="GUID-57895C34-AD00-35E1-9BF8-478653056383.dita"><apiname>TRAPD</apiname></xref>)
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and <xref href="GUID-C197C9A7-EA05-3F24-9854-542E984C612D.dita#GUID-C197C9A7-EA05-3F24-9854-542E984C612D/GUID-ABF0FC5C-3334-3761-893D-D836B2EE0541"><apiname>User::Leave()</apiname></xref> in a destructor, nor in any function
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that a destructor might call, for objects that have been placed onto the call
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stack. <xref href="GUID-3F2CDC74-2568-371C-9D8E-34A66A619226.dita"><apiname>TRAP</apiname></xref> and <xref href="GUID-C197C9A7-EA05-3F24-9854-542E984C612D.dita#GUID-C197C9A7-EA05-3F24-9854-542E984C612D/GUID-ABF0FC5C-3334-3761-893D-D836B2EE0541"><apiname>User::Leave()</apiname></xref> are implemented
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in terms of C++ Try, Catch and Throw. This means that if an exception occurs,
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the call stack is "unwound". In doing this, the destructors of objects on
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the call stack are called. If any of these destructors subsequently throw
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an exception, this is termed a nested exception. While a nested exception
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is supported on the emulator (WINS), it is not supported on other hardware,
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and there is no guarantee that the thread will terminate cleanly. </p>
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<p>Symbian coding standards state that objects placed onto the call stack
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should not have non-trivial destructors. By convention, such classes are identified
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by names having an initial T or R. This means that such destructors should
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not leave. </p>
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<p>The following code fragment shows the kind of code that is <i>not safe</i> to
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use: </p>
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<codeblock id="GUID-7B2BD496-6F99-5586-B320-DB7C5DC490B9" xml:space="preserve">void f()  
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    {
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    TBar bar;
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    // Function processing.
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    ...
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    // The bar object on the call stack is automatically destroyed
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    // at function termination.
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    }
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TBar::~TBar()
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    {
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    // The destructor calls a function that can leave.
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    // This is not permitted here.
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    doCleanUpL();
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    }</codeblock>
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<p>You <i>can</i> use <xref href="GUID-3F2CDC74-2568-371C-9D8E-34A66A619226.dita"><apiname>TRAP</apiname></xref> (and <xref href="GUID-57895C34-AD00-35E1-9BF8-478653056383.dita"><apiname>TRAPD</apiname></xref>)
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and <xref href="GUID-C197C9A7-EA05-3F24-9854-542E984C612D.dita#GUID-C197C9A7-EA05-3F24-9854-542E984C612D/GUID-ABF0FC5C-3334-3761-893D-D836B2EE0541"><apiname>User::Leave()</apiname></xref> in a destructor and in any function that
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a destructor might call, for heap-based objects, i.e. objects that are destroyed
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by the cleanup stack. However, while this is permissible, it is not recommended
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practice. </p>
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<p>Such objects are instances of classes derived from <xref href="GUID-8F6FE089-E2A8-30F4-B67E-10F286347681.dita"><apiname>CBase</apiname></xref>,
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and by convention such classes are identified by names having have an initial
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C. </p>
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<p>In principle, a destructor should never fail. If a destructor can leave,
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or a function called by the destructor can leave, it suggests that the code
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has been poorly architected. It also implies that part of the destruction
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process might fail, potentially leading to memory or handle leaks. </p>
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<p>One possible approach to avoid using functions that can leave within a
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destructor is to have what might be referred to as ‘two-phase destruction’
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where some form of <codeph>ShutdownL</codeph> function is called prior to
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deleting the object. If there are concerns about introducing additional complexities
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in API-usage (and greater risk), suitable guards can be introduced. One method
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might be to store the current state of the object internally and then use
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an ASSERT to check this in the destructor. This would ensure that any usage
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errors are discovered by very simple run time testing. </p>
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<p>The following code fragment shows an example of two-phase destruction. </p>
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<codeblock id="GUID-BA3B57D6-913F-5AEC-A7AB-4EE6B915127A" xml:space="preserve">// Here, the shutdown function is a member of the class CMyClass,
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// and performs destruction activity that can leave.
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class CMyClass : public CBase
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    {
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public :
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    IMPORT_C ~CMyClass();
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    IMPORT_C void ShutdownL();
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    ...
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private :
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    TBool iStateActive
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    ...
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    }
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EXPORT_C void CMyClass::ShutdownL()
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    {
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       if (iStateActive == ETrue)
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              {
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              // Some destruction activity that can leave.
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              iStateActive = EFalse;
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              }
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    }
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EXPORT_C CMyClass::~CMyClass()
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    {
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       // Assert to ensure that ShutdownL() has already been called.
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       ASSERT(iStateActive == EFalse);
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    }
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</codeblock>
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</conbody></concept>