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<task id="GUID-B419D99E-8312-5336-9693-3ED8DFCD0559" xml:lang="en"><title>Automatic

Resource Management Tutorial</title><abstract><p>The class templates for automatic resource management rely on

guaranteed execution of their destructor to trigger cleanup. Due to potential

issues with cleanup order when used in conjunction with the Symbian cleanup

stack, different variants are required for managing local and member variables

as described below.  </p></abstract><prolog><metadata><keywords/></metadata></prolog><taskbody>

<prereq><p>Before beginning you must know the following: </p> <ul>

<li id="GUID-2B05A77D-54BF-5658-B620-F9F63C121DAA"><p> <b> LcleanedupX Classes:</b> The

LCleanedupX class provide a means of automatically cleaning up local variables

on scope exit. </p> </li>

<li id="GUID-06C21765-F4F9-5884-8C1E-93227E253DDF"><p> <b> LmanagedX Classes:</b> The

LManagedX classes provide a means of automatically cleaning up member variables

when the containing object is destroyed </p> </li>

</ul> </prereq>

<context><p>The collection of C++ class templates that provide automatic resource

management provided by EuserHl library is based on the C++ RAII idiom. The

Symbian C++ class templates for automatic resource management are based on

the C++ RAII idiom, in order to provide exception-safe automatic cleanup on

normal or exceptional exit from a scope. </p><p><b>Automatic Resource Management

Class templates</b></p><p>The Symbian C++ class templates for automatic resource

management are relatively easier to use. They provide automatic exception-safe

cleanup upon normal or exceptional exit from a scope. In which case they do

not require writing any code for invoking the cleanup of resources. The resources

are automatically cleaned up by the destructors of the template classes in

that case.  </p><p> The following are the class templates for automatic resource

management: </p><ul>

<li><p><b>LcleanedupX Classes </b></p></li>

<li><p><b>LmanagedX Classes</b> </p></li>

</ul><note> Due to potential issues with cleanup order when used in conjunction

with the Symbian cleanup stack, different variants are required for managing

local and member variables. Click here for more information on

Automatic Resource Management Class templates. </note></context>

</taskbody><related-links>

<link href="GUID-B1D5B680-00E3-5702-985A-94256180E2D8.dita"><linktext>Automatic

Resource Management</linktext></link>

<link href="GUID-69D916D3-ED05-58DA-BA42-CE4D7E4F6482.dita"><linktext>Automatic

 Resource Management Class Templates Tutorial</linktext></link>

</related-links></task>