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<concept id="GUID-62E8D3DF-7DF8-5FCA-8D7D-AA30EB0B8962" xml:lang="en"><title>Low

Level Libraries and Frameworks Overview</title><prolog><metadata><keywords/></metadata></prolog><conbody>

<p>The Low Level Libraries and Frameworks collection comprises various low-level

system and application utilities, a generic usability library and an extensible

plug-in framework. </p>

<section id="GUID-64516E26-E3D3-4482-A8EF-9BCEFD96C464"><title>Description</title> <p>Low Level Libraries and Frameworks

includes the following components: </p> <ul>

<li id="GUID-0120320B-C32E-5003-8BD2-6A764155213E"><p> <b>Application Utilities:</b> A

collection of libraries that provide low-level system and application utility

APIs. It includes the following libraries: </p> <ul>

<li id="GUID-5B1B2CEF-7410-5A2C-A75E-CD7349F521BA"><p><xref href="GUID-39D1807D-3AE0-5273-AA3B-80E8F580DC0B.dita">Activity

Manager</xref>  </p> </li>

<li id="GUID-1D3047AE-F940-5002-8F15-EDE771E7E8CC"><p><xref href="GUID-C8BD333E-8384-534B-822B-F61B2F7C8B9F.dita">Basic

Application Framework Utilities (BAFL)</xref>  </p> </li>

<li id="GUID-D8FEF0A1-7845-51C8-A8C0-607E8D20901F"><p><xref href="GUID-D98E984D-69A5-5BA8-89E7-A7CC9FD0C584.dita">Base

Services Utility Library (BSUL)</xref>  </p> </li>

<li id="GUID-60D36AF0-A9EC-5116-A5C7-62CC476BB4E5"><p><xref href="GUID-4B8AEE55-1601-5CF8-9DD1-492DAE18F0F8.dita">System

Utilities</xref>  </p> </li>

</ul> <p>For more information about this component, see <xref href="GUID-D02B5AF1-B1C3-560D-9654-971A5CC1A904.dita">Application

Utilities</xref>. </p> </li>

<li id="GUID-F9168726-55DA-5146-975C-A69BC29F95E3"><p> <b>Generic Usability

Library (EUserHL):</b> For historic reasons Symbian C++ has non-standard idioms

for writing memory efficient leave-safe code. This library provides support

for alternative mechanisms which might be more familiar to Symbian Developers

new to the Symbian platform, and which require fewer lines of

code. These include: </p> <ul>

<li id="GUID-88E98632-2237-5E9F-BEA5-629344D11A47"><p>Single phase construction </p> </li>

<li id="GUID-BEEA1776-19D2-5371-8D41-4E4E9F287D6E"><p>Constructors which can

leave </p> </li>

<li id="GUID-7C180C31-CB29-520C-A9B6-73AD9FBBB4A4"><p>Self managing variable

length strings </p> </li>

<li id="GUID-6CC06B10-EAA4-5768-A8A1-BB0A6871CD13"><p>Managed pointers which

do not require explicit deletion </p> </li>

<li id="GUID-FD8FC39B-AFD0-5B7D-B165-DA03A7E74600"><p>Cleaned up pointers

which do not require explicit use of the CleanupStack API. </p> </li>

</ul> <p>For more information about this component, see <xref href="GUID-D60B55FA-D8C1-559A-9D99-48845BE32A6C.dita">EUser

High Level Library</xref>. </p> </li>

<li id="GUID-0763D19B-7A8D-5FEC-BFEA-59C47D69E7AC"><p> <b> Plug-in Framework

(ECom):</b> Provides a generic and extensible plug-in framework with which

abstract interfaces can be defined and their implementations identified, loaded

and managed at run time. For more information, see Plug-in Framework. For

more information, see <xref href="GUID-9E92EE30-F2E2-5F28-BB2A-391C09EC69D2.dita">Plug-in

Framework</xref>. </p> </li>

</ul> </section>

</conbody><related-links>

<link href="GUID-D80D6D46-27B7-500E-A83C-63EF038606BF.dita"><linktext>Application

Utilities                 Overview</linktext></link>

<link href="GUID-8A7B837D-4069-5364-A596-686EEBAE351D.dita"><linktext>Plug-in Framework

Overview</linktext></link>

</related-links></concept>