author | Dominic Pinkman <dominic.pinkman@nokia.com> |
Fri, 11 Jun 2010 15:24:34 +0100 | |
changeset 9 | 59758314f811 |
parent 7 | 51a74ef9ed63 |
permissions | -rw-r--r-- |
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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-C1BCBA03-4E64-5188-8D33-25B4121C1582" xml:lang="en"><title>Use |
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of the Internalize class</title><prolog><metadata><keywords/></metadata></prolog><conbody> |
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<p>The implementation of the family of operators <xref href="GUID-81749C6F-A341-37A6-9F17-C6028F975764.dita"><apiname>operator>>()</apiname></xref> calls |
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the internal Symbian platform function <codeph>DoInternalizeL()</codeph>. |
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There are two variants of this function distinguished by the value of the |
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third parameter as either <xref href="GUID-0A518426-B517-33C3-B2E3-874CAF36E963.dita#GUID-0A518426-B517-33C3-B2E3-874CAF36E963/GUID-1B393431-A301-3B49-858A-8915017E8CC9"><apiname>Internalize::Member</apiname></xref> or <xref href="GUID-0A518426-B517-33C3-B2E3-874CAF36E963.dita#GUID-0A518426-B517-33C3-B2E3-874CAF36E963/GUID-0F3DF32C-128B-36A0-A4F7-8B7574CE4621"><apiname>Internalize::Function</apiname></xref>.</p> |
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<p>The family of operators <xref href="GUID-81749C6F-A341-37A6-9F17-C6028F975764.dita"><apiname>operator>>()</apiname></xref> are implemented |
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as follows:</p> |
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<codeblock id="GUID-5DCCDC49-ADD3-59F1-9243-BA91C521DFFD" xml:space="preserve">template <class T> |
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inline RWriteStream& operator>>(RReadStream& aStream,T& anObject) |
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{ |
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DoInternalizeL(anObject,aStream,Internalization(&anObject)); |
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return aStream; |
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}</codeblock> |
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<p>The two variants of <codeph>DoInternalizeL()</codeph> are defined and implemented |
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as:</p> |
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<codeblock id="GUID-0BFB5C93-B2E4-5050-936A-465A077728FB" xml:space="preserve">template <class T> |
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inline void DoInternalizeL(T& anObject,RReadStream& aStream,Internalize::Member) |
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{anObject.InternalizeL(aStream);}</codeblock> |
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<codeblock id="GUID-916AE079-80BB-5039-8F96-771F81CC1077" xml:space="preserve">template <class T> |
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inline void DoInternalizeL(T& anObject,RReadStream& aStream,Internalize::Function) |
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{InternalizeL(anObject,aStream);}</codeblock> |
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<p>The variant called depends on the value returned from a call to the internal |
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selector function, <codeph>Internalization()</codeph>. This selector function |
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returns either <codeph>Internalize::Function</codeph> or <codeph>Internalize::Member</codeph>, |
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depending on the type of <codeph>anObject</codeph>.</p> |
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<p>The internal selector function <codeph>Internalization()</codeph> is a |
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convenience mechanism that allows the <xref href="GUID-81749C6F-A341-37A6-9F17-C6028F975764.dita"><apiname>operator>>()</apiname></xref> to call |
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either the <codeph>InternalizeL()</codeph> member function of a templated |
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class or an <codeph>InternalizeL()</codeph> templated global function.</p> |
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<p>The store framework defines and implements a default selector function, |
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prototyped as:</p> |
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<codeblock id="GUID-28AEEF03-52AC-522B-BFEF-730031BCCFC2" xml:space="preserve">Internalize::Member Internalization(const TAny*)</codeblock> |
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<p>By default, a call to <codeph>Internalization()</codeph> passing a parameter |
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of general class type, is resolved at compile time into a call to this variant, |
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and the return type is <xref href="GUID-0A518426-B517-33C3-B2E3-874CAF36E963.dita#GUID-0A518426-B517-33C3-B2E3-874CAF36E963/GUID-1B393431-A301-3B49-858A-8915017E8CC9"><apiname>Internalize::Member</apiname></xref>. The store framework |
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also defines and implements a number of other variants that take more specific |
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argument types; for example, as part of its implementation of <xref href="GUID-81749C6F-A341-37A6-9F17-C6028F975764.dita"><apiname>operator>>()</apiname></xref> for |
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descriptors, the framework defines and implements:</p> |
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<codeblock id="GUID-442D9DD2-6643-5F3F-ACD4-3D4D42B65639" xml:space="preserve">Internalize::Function Internalization(const TDesC8*)</codeblock> |
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</conbody></concept> |