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<A HREF="1-1.html"><IMG SRC="images/bprev.gif" WIDTH=20 HEIGHT=21 ALT="Previous file" BORDER=O></A><A HREF="noframes.html"><IMG SRC="images/btop.gif" WIDTH=56 HEIGHT=21 ALT="Top of Document" BORDER=O></A><A HREF="booktoc.html"><IMG SRC="images/btoc.gif" WIDTH=56 HEIGHT=21 ALT="Contents" BORDER=O></A><A HREF="tindex.html"><IMG SRC="images/bindex.gif" WIDTH=56 HEIGHT=21 ALT="Index page" BORDER=O></A><A HREF="1-3.html"><IMG SRC="images/bnext.gif" WIDTH=25 HEIGHT=21 ALT="Next file" BORDER=O></A><DIV CLASS="DOCUMENTNAME"><B>Apache C++ Standard Library User's Guide</B></DIV>
<H2>1.2 Product Overview</H2>
<A NAME="121"><H3>1.2.1 Components</H3></A>
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<P>The C++ Standard Library is a large and comprehensive collection of classes and functions for fine-grained, low-level programming. Within this library, you will find the following components:</P>
<UL>
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<LI><P CLASS="LIST">The large set of data structures and algorithms formerly known as the Standard Template Library (STL)</P></LI>
<LI><P CLASS="LIST">An iostream facility</P></LI>
<LI><P CLASS="LIST">A locale facility</P></LI>
<LI><P CLASS="LIST">A templatized <B><I><A HREF="../stdlibref/basic-string.html">string</A></I></B> class</P></LI>
<LI><P CLASS="LIST">A templatized <B><I><A HREF="../stdlibref/complex.html">complex</A></I></B> class for representing complex numbers</P></LI>
<LI><P CLASS="LIST">A <B><I><A HREF="../stdlibref/valarray.html">valarray</A></I></B> class optimized for handling numeric arrays</P></LI>
<LI><P CLASS="LIST">A uniform framework for describing the execution environment, using a template class named <B><I><A HREF="../stdlibref/numeric-limits.html">numeric_limits</A></I></B> and specializations for each fundamental datatype</P></LI>
<LI><P CLASS="LIST">Memory management features</P></LI>
<LI><P CLASS="LIST">Extensive support for national character sets</P></LI>
<LI><P CLASS="LIST">Exception handling features</P></LI>
</UL>
<A NAME="122"><H3>1.2.2 STL Not Object-Oriented</H3></A>
<P>The STL portion of the C++ Standard Library is not object-oriented. If you are accustomed to the benefits of object-oriented programming, their absence may necessitate some adjustment. Encapsulation of data and functionality in objects is a hallmark of object-oriented programming. In the C++ Standard Library, however, the data structures are separate from the algorithms you use to manipulate them.</P>
<P>This feature can provide a number of advantages, such as smaller source code, and the flexibility of using algorithms with C++ pointers and arrays as well as conventional objects. It can also lead to more efficient coding and faster execution, since it creates a direct, nuts-and-bolts approach to solving problems.</P>
<P>The main disadvantage of using the C++ Standard Library directly is increased risk of error. For example, the library's iterators must not be mismatched or invalidated, and iterators in multithreaded environments should be wrapped before being shared among threads. The templates can cause less precise diagnostics, and code that grows unexpectedly large. Experience with the library and your own compiler will help diminish these problems.</P>
<A NAME="123"><H3>1.2.3 Relationship to the Essential Tools Module</H3></A>
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<P>This implementation of the C++ Standard Library is certified for use with the  Essential Tools Module of SourcePro Core, which encapsulates the C++ Standard Library with an object-oriented interface. Used together, the Essential Tools and C++ Standard Library Modules are designed to provide the benefits of both low-level generic programming and object-orientation. </P>
<P>The Essential Tools Module also contains features not included in the standard, such as time, date, and regular expression classes, enhanced strings, hash containers, object persistence, and virtual streams. The Essential Networking Module of SourcePro Net extends the functionality of the Essential Tools Module with classes for network programming. For some programming tasks, you may find it easier and more convenient to use the Essential Tools and Essential Networking Modules without accessing the C++ Standard Library directly. </P>

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