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<H2>4.1 Overview</H2>
<A NAME="idx58"><!></A>
<P>The C++ Standard Library provides ten alternative forms of containers and three container adaptors. In this chapter we briefly identify these forms, consider their characteristics, and discuss how you might go about selecting which form to use in solving a particular problem. Subsequent chapters then go over each of the different forms in more detail.</P>
<P><A HREF="4-1.html#Table&nbsp;6">Table&nbsp;6</A> lists the container types provided by the C++ Standard Library, and describes the most significant characteristic of each. <A HREF="4-1.html#Table&nbsp;7">Table&nbsp;7</A> does the same for the container adaptors.</P>
<H4><A NAME="Table&nbsp;6">Table&nbsp;6: Container types provided by the C++ Standard Library&nbsp;</A></H4>
<TABLE BORDER="1" CELLPADDING="3" CELLSPACING="3">
<tr><td valign=top><B>Name</B>
</td><td valign=top><B>Characteristic</B>
</td></tr>
<tr><td valign=top><P CLASS="TABLE"><SAMP>vector</SAMP></P>
</td><td valign=top><P CLASS="TABLE">Random access to elements, efficient insertion at back</P>
</td></tr>
<tr><td valign=top><P CLASS="TABLE"><SAMP>vector&lt;bool&gt;</SAMP></P>
</td><td valign=top><P CLASS="TABLE">Specialization of <SAMP>vector</SAMP> optimized for <SAMP>bool</SAMP></P>
</td></tr>
<tr><td valign=top><P CLASS="TABLE"><SAMP>list</SAMP></P>
</td><td valign=top><P CLASS="TABLE">Efficient insertion and removal throughout</P>
</td></tr>
<tr><td valign=top><P CLASS="TABLE"><SAMP>deque</SAMP></P>
</td><td valign=top><P CLASS="TABLE">Random access, efficient insertion at front or back</P>
</td></tr>
<tr><td valign=top><P CLASS="TABLE"><SAMP>set</SAMP></P>
</td><td valign=top><P CLASS="TABLE">Elements maintained in order, efficient tests for inclusion, insertion, and removal</P>
</td></tr>
<tr><td valign=top><P CLASS="TABLE"><SAMP>multiset</SAMP></P>
</td><td valign=top><P CLASS="TABLE">Set with repeated copies</P>
</td></tr>
<tr><td valign=top><P CLASS="TABLE"><SAMP>bitset</SAMP></P>
</td><td valign=top><P CLASS="TABLE">Bit container.   Specialized on size rather than contained type</P>
</td></tr>
<tr><td valign=top><P CLASS="TABLE"><SAMP>map</SAMP></P>
</td><td valign=top><P CLASS="TABLE">Access to values via keys, efficient insertion and removal</P>
</td></tr>
<tr><td valign=top><P CLASS="TABLE"><SAMP>multimap</SAMP></P>
</td><td valign=top><P CLASS="TABLE">Map permitting duplicate keys</P>
</td></tr>
<tr><td valign=top><P CLASS="TABLE"><SAMP>string</SAMP></P>
</td><td valign=top><P CLASS="TABLE">Character container enhanced for string operations</P>
</td></tr>
</TABLE>
<A NAME="idx59"><!></A>
<H4><A NAME="Table&nbsp;7">Table&nbsp;7: Container adaptors of the C++ Standard Library</A></H4>
<TABLE BORDER="1" CELLPADDING="3" CELLSPACING="3">
<tr><td valign=top><B>Name</B>
</td><td valign=top><B>Characteristic</B>
</td></tr>
<tr><td valign=top><P CLASS="TABLE"><SAMP>stack</SAMP></P>
</td><td valign=top><P CLASS="TABLE">Insertions and removals only from back</P>
</td></tr>
<tr><td valign=top><P CLASS="TABLE"><SAMP>queue</SAMP></P>
</td><td valign=top><P CLASS="TABLE">Insertions at back, removals from front</P>
</td></tr>
<tr><td valign=top><P CLASS="TABLE"><SAMP>priority_queue</SAMP></P>
</td><td valign=top><P CLASS="TABLE">Efficient access and removal of highest priority items</P>
</td></tr>
</TABLE>

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