author | Dominic Pinkman <dominic.pinkman@nokia.com> |
Fri, 13 Aug 2010 16:47:46 +0100 | |
changeset 14 | 578be2adaf3e |
parent 5 | f345bda72bc4 |
permissions | -rw-r--r-- |
14
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Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
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1 |
<?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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8 |
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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Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
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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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Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
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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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|
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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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|
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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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|
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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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Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
5
diff
changeset
|
87 |
} |
578be2adaf3e
Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
5
diff
changeset
|
88 |
|
578be2adaf3e
Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
5
diff
changeset
|
89 |
EXPORT_C CMyClass::~CMyClass() |
578be2adaf3e
Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
5
diff
changeset
|
90 |
{ |
578be2adaf3e
Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
5
diff
changeset
|
91 |
// Assert to ensure that ShutdownL() has already been called. |
578be2adaf3e
Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
5
diff
changeset
|
92 |
ASSERT(iStateActive == EFalse); |
578be2adaf3e
Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
5
diff
changeset
|
93 |
} |
578be2adaf3e
Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
Dominic Pinkman <dominic.pinkman@nokia.com>
parents:
5
diff
changeset
|
94 |
</codeblock> |
1
25a17d01db0c
Addition of the PDK content and example code for Documentation_content according to Feature bug 1607 and bug 1608
Dominic Pinkman <Dominic.Pinkman@Nokia.com>
parents:
diff
changeset
|
95 |
</conbody></concept> |