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<reference id="GUID-F15B9BDF-EDF8-5684-A0FC-C0A08F9C1F22" xml:lang="en"><title>linkedlist:

Using the Linked List classes</title><shortdesc/><prolog><metadata><keywords/></metadata></prolog><refbody>

<section id="GUID-4B81C04C-94DD-4694-9BD9-447ADE72B294"><p>The following examples

show the use of the linked list classes: </p> <ul>

<li id="GUID-F204E5EC-593B-556D-83DC-72B7B5C7C46A"><p><xref href="GUID-F15B9BDF-EDF8-5684-A0FC-C0A08F9C1F22.dita#GUID-F15B9BDF-EDF8-5684-A0FC-C0A08F9C1F22/GUID-4366D8F9-3E8F-53B2-BB3C-A32CA13DA96D"> Singly linked list example</xref>  </p> </li>

<li id="GUID-295D6285-199E-5FD8-B0B9-90FA546831F8"><p><xref href="GUID-F15B9BDF-EDF8-5684-A0FC-C0A08F9C1F22.dita#GUID-F15B9BDF-EDF8-5684-A0FC-C0A08F9C1F22/GUID-FC5F8D9A-C594-5FBB-9AD1-8DEB72A5F5BD"> Doubly linked list example</xref>  </p> </li>

<li id="GUID-F459FF26-D837-5E5F-BB50-67D12D3EE93F"><p><xref href="GUID-F15B9BDF-EDF8-5684-A0FC-C0A08F9C1F22.dita#GUID-F15B9BDF-EDF8-5684-A0FC-C0A08F9C1F22/GUID-7FFDF885-72F4-543E-A93E-C6A57D3D7DE0"> Delta queue example</xref>  </p> </li>

</ul> </section>

<section id="GUID-4366D8F9-3E8F-53B2-BB3C-A32CA13DA96D"><title>Singly linked

list example</title> <p>This example application demonstrates the use of singly

linked lists. The templated <xref href="GUID-40BA1263-BE07-3C7F-955E-0BBC632E7C58.dita"><apiname>TSglQue</apiname></xref> class is used to create

a singly linked list. </p> <p><b>Download</b> </p> <p>Click on the following

link to download the example: <xref href="guid-6013a680-57f9-415b-8851-c4fa63356636/zips/guid-54304ba8-7028-43b8-89b8-d89432684981.zip" scope="external">sgllist.zip</xref></p><p>Click: <xref href="guid-6013a680-57f9-415b-8851-c4fa63356636/guid-54304ba8-7028-43b8-89b8-d89432684981.html" scope="peer">browse </xref>to view the example.</p> <p><b>Description</b> </p> <p>The

example creates a singly linked list of objects of the <xref href="GUID-129B4F4D-500E-37E8-9D29-94E3E6D11BD9.dita"><apiname>TDigit</apiname></xref> class.

This list represents a long number. An object of class <xref href="GUID-F20187A8-CC62-34C6-830C-FB077515AAF8.dita"><apiname>CLongNumber</apiname></xref> owns

the list. The user can edit this list using the functions defined in the <codeph>CLongNumber</codeph> class.

The following edit operations are possible: </p> <ul>

<li id="GUID-C793B73E-9037-5B22-8A3A-EFAD7A666D53"><p>Insert an object of

the <codeph>TDigit</codeph> class at the start of the singly linked list </p> </li>

<li id="GUID-C46B31C9-49FF-5457-9157-E55316F26252"><p>Insert an object of

the <codeph>TDigit</codeph> class at the end of the singly linked list </p> </li>

<li id="GUID-9AFD5005-AA6A-5D7D-9B96-35CBA4791128"><p>Remove an object of

the <codeph>TDigit</codeph> class from the end of the singly linked list </p> </li>

</ul> <p>The user can perform any of these operations by pressing keys specified

in the menu. <codeph>CLongNumber</codeph> is an active object class and handles

the key press events in the <codeph>CLongNumber::RunL()</codeph> function.The <codeph>CLongNumber::ReadFunc()</codeph> function

displays a menu and waits for an asynchronous key press event. </p> <p>An

object of the templated <xref href="GUID-0A865633-5038-3320-A472-A2EE18F04FBE.dita"><apiname>TSglQueIter</apiname></xref> class is used to traverse

this linked list. The sum of all digits of the number represented by the linked

list is displayed to the user. </p> <p>An object of the <xref href="GUID-D0AE0223-82DC-369A-A8FB-C2086C1EC77C.dita"><apiname>CAdder</apiname></xref> class

is used to traverse the <codeph>CLongNumber::iNumber</codeph> list and print

the sum of all digits of the number represented by this list. The <codeph>CAdder::Add()</codeph> function

gets this sum. </p><p><b>Related APIs</b></p><ul>

<li><p><xref href="GUID-D0AE0223-82DC-369A-A8FB-C2086C1EC77C.dita"><apiname>CAdder</apiname></xref></p></li>

<li><p><xref href="GUID-F20187A8-CC62-34C6-830C-FB077515AAF8.dita"><apiname>CLongNumber</apiname></xref></p></li>

<li><p><xref href="GUID-129B4F4D-500E-37E8-9D29-94E3E6D11BD9.dita"><apiname>TDigit</apiname></xref></p></li>

<li><p><xref href="GUID-0A865633-5038-3320-A472-A2EE18F04FBE.dita"><apiname>TSglQueIter</apiname></xref></p></li>

</ul> <p><b>Design and implementation</b> </p> <p>Figure 1 shows the classes

in the example. </p> <fig id="GUID-7BB458A7-C1E6-5919-A503-BFBE695432AA">

<title>     Figure 1. Classes in the singly linked list example          

    </title>

<image href="GUID-D6B332EB-D9D7-5598-98C7-E73164A2057D_d0e354088_href.jpg" placement="inline"/>

</fig> <p><b>Class summary</b></p><ul>

<li><p><xref href="GUID-40BA1263-BE07-3C7F-955E-0BBC632E7C58.dita"><apiname>TSglQue</apiname></xref></p></li>

<li><p> <xref href="GUID-0A865633-5038-3320-A472-A2EE18F04FBE.dita"><apiname>TSglQueIter</apiname></xref></p></li>

</ul><p><b>Build</b> </p> <p><xref href="GUID-3100800B-B2F7-50EF-BD4C-3C345ECCB2A5.dita">The

Symbian build process</xref> describes how to build this example. </p> <p>For

the emulator, the example builds an executable called <filepath>sgllist.exe</filepath> in

the <filepath>epoc32\release\winscw\&lt;udeb or urel&gt;\</filepath> folder. </p><p><b>See

also:</b></p><p><xref href="GUID-052E9582-9A35-50B0-A32E-F7E6A01A2E2A.dita">Using

Singly Linked Lists</xref></p> </section>

<section id="GUID-FC5F8D9A-C594-5FBB-9AD1-8DEB72A5F5BD"><title>Doubly linked

list example</title> <p>This example application demonstrates the use of doubly

linked lists. The templated <xref href="GUID-E5E9834A-63CA-3F03-88D3-85B912ADA54C.dita"><apiname>TDblQue</apiname></xref> class is used create

a doubly linked list. </p> <p><b>Download</b> </p> <p>Click on the following

link to download the example: <xref href="guid-6013a680-57f9-415b-8851-c4fa63356636/zips/guid-3a268b1a-9a7e-49ae-bc76-f99bdc3b32f5.zip" scope="external">dbllist.zip</xref></p><p>Click: <xref href="guid-6013a680-57f9-415b-8851-c4fa63356636/guid-3a268b1a-9a7e-49ae-bc76-f99bdc3b32f5.html" scope="peer">browse </xref>to view the example code</p> <p><b>Description</b> </p> <p>The

example creates a doubly linked list of objects of the <codeph>TLetter</codeph> class.

This list represents a character string. An object of class <codeph>CMyStringReverse</codeph> owns

this string. The user can edit this string using the functions defined in

the <codeph>CMyStringReverse</codeph> class. The following edit operations

are possible: </p> <ul>

<li id="GUID-D3B39123-1249-59DD-BC1F-2D62B7F9DE84"><p>Insert a character at

the start of the list </p> </li>

<li id="GUID-E6CEC00A-B6C1-53B2-9AAA-870EA8B06A5B"><p>Insert a character at

the end of the list </p> </li>

</ul> <p>The user can perform either of these operations by pressing keys

specified in the menu. <codeph>CMyStringReverse</codeph> is an active object

class and handles key press events in the <codeph>CMyStringReverse::RunL()</codeph> function.

The <codeph>CMyStringReverse::ReadFunc()</codeph> function displays a menu

and waits for an asynchronous key press event. </p> <p>The <codeph>CMyStringReverse</codeph> class

has a doubly linked list iterator, <codeph>iIteratorString</codeph>. The <codeph>iIteratorString</codeph> object

iterates through the list <codeph>iString</codeph> from start to end to print

the string reversed. </p><p><b>Design and implementation</b></p><p>Figure

2 shows the classes in the example.</p><fig id="GUID-67F3F952-D0A8-4A28-8CB2-0394C1562A29">

<title> Figure 2. Classes in the doubly linked list example </title>

<image href="GUID-21A1D1D2-524E-560E-88C8-16E2E49E2B7F_d0e354227_href.jpg" placement="inline"/>

</fig><p><b>Class summary</b></p><ul>

<li><p><xref href="GUID-E5E9834A-63CA-3F03-88D3-85B912ADA54C.dita"><apiname>TDblQue</apiname></xref> - A templated class that provides the behaviour

for managing a doubly linked list.</p></li>

</ul> <p><b>Build</b> </p> <p><xref href="GUID-3100800B-B2F7-50EF-BD4C-3C345ECCB2A5.dita">The

Symbian build process</xref> describes how to build this example. </p> <p>For

the emulator, the example builds an executable called <filepath>dbllist.exe</filepath> in

the <filepath>epoc32\release\winscw\&lt;udeb or urel&gt;\</filepath> folder. </p> <p><b>See

also</b> </p> <p><xref href="GUID-F45EA14E-F857-5D59-BFBA-E2F563287359.dita">Using

Doubly Linked Lists</xref>  </p> <p><b>Example code</b> </p> </section>

<section id="GUID-7FFDF885-72F4-543E-A93E-C6A57D3D7DE0"><title>Delta queue

example</title> <p>This example application demonstrates the use of the delta

queue. The templated <xref href="GUID-E67BB56F-F9DD-316D-BC16-ED60D31A5925.dita"><apiname>TDeltaQue</apiname></xref> class is used create a delta

queue. </p> <p><b>Download</b> </p> <p>Click on the following link to download

the example: <xref href="guid-6013a680-57f9-415b-8851-c4fa63356636/zips/guid-6a73c507-073b-4993-aa02-a677a384bafb.zip" scope="external">deltaque.zip</xref></p><p>Click: <xref href="guid-6013a680-57f9-415b-8851-c4fa63356636/guid-6a73c507-073b-4993-aa02-a677a384bafb.html" scope="peer">browse </xref>to view the example code.</p> <p><b>Description</b> </p> <p>The

example creates an object of the <codeph>CTimerEntry</codeph> class. This

is a <xref href="GUID-5733DF34-5B54-3044-BBED-3BFECB7ACE7A.dita"><apiname>CTimer</apiname></xref> derived class. An object of this class generates

timer events by using the <xref href="GUID-5733DF34-5B54-3044-BBED-3BFECB7ACE7A.dita#GUID-5733DF34-5B54-3044-BBED-3BFECB7ACE7A/GUID-F389C301-D56B-3981-9C26-180E02BFF171"><apiname>CTimer::After()</apiname></xref> function. The

data member of this class, <codeph>iQueue</codeph> is a delta list. The offset

value of each node in this list is the tick count after each timer event.

The <codeph>CTimerEntry::Arbitrator()</codeph> function decides the action

to be performed for each event generated by the timer. It either adds tick

counts to the list or removes elements from the list based on the state of

the queue. </p><p><b>Related APIs</b></p><ul>

<li><p><xref href="GUID-5733DF34-5B54-3044-BBED-3BFECB7ACE7A.dita"><apiname>CTimer</apiname></xref> - Base class for a timer active object.</p></li>

<li><p><xref href="GUID-5733DF34-5B54-3044-BBED-3BFECB7ACE7A.dita#GUID-5733DF34-5B54-3044-BBED-3BFECB7ACE7A/GUID-F389C301-D56B-3981-9C26-180E02BFF171"><apiname>CTimer::After()</apiname></xref></p></li>

</ul><p><b>Design and implementation</b></p><p> Figure 3 shows the classes

of the example. </p><fig id="GUID-2E093EFA-7A18-4623-AE31-3FA1FDB103F5">

<title> Figure 3. Classes of the delta queue example </title>

<image href="GUID-8CF0C00C-0FDF-517E-96FB-84F718237F61_d0e354356_href.jpg" placement="inline"/>

</fig><p><b>Class summary</b></p><ul>

<li><p> <xref href="GUID-E67BB56F-F9DD-316D-BC16-ED60D31A5925.dita"><apiname>TDeltaQue</apiname></xref></p></li>

<li><p><xref href="GUID-5733DF34-5B54-3044-BBED-3BFECB7ACE7A.dita"><apiname>CTimer</apiname></xref> - Base class for a timer active object.</p></li>

</ul> <p><b>Build</b> </p> <p><xref href="GUID-3100800B-B2F7-50EF-BD4C-3C345ECCB2A5.dita">The

Symbian build process</xref> describes how to build this example. </p> <p>For

the emulator, the example builds an executable called <filepath>deltaque.exe</filepath> in

the <filepath>epoc32\release\winscw\&lt;udeb or urel&gt;\</filepath> folder. </p> </section>