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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>