| <!-- |
| Licensed to the Apache Software Foundation (ASF) under one or more |
| contributor license agreements. See the NOTICE file distributed |
| with this work for additional information regarding copyright |
| ownership. The ASF licenses this file to you under the Apache |
| License, Version 2.0 (the License); you may not use this file |
| except in compliance with the License. You may obtain a copy of |
| the License at |
| |
| http://www.apache.org/licenses/LICENSE-2.0 |
| |
| Unless required by applicable law or agreed to in writing, software |
| distributed under the License is distributed on an "AS IS" BASIS, |
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or |
| implied. See the License for the specific language governing |
| permissions and limitations under the License. |
| |
| Copyright 1999-2007 Rogue Wave Software, Inc. |
| --> |
| |
| <HTML> |
| <HEAD> |
| <TITLE>The deque Data Abstraction</TITLE> |
| <LINK REL=StyleSheet HREF="../rw.css" TYPE="text/css" TITLE="Apache stdcxx Stylesheet"></HEAD> |
| <BODY BGCOLOR=#FFFFFF> |
| <A HREF="7.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="7-2.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>7.1 The deque Data Abstraction</H2> |
| <A NAME="idx122"><!></A> |
| <P>The name <I>deque</I> is short for <I>double-ended queue</I>, and is pronounced like <I>deck</I>. Traditionally, the term is used to describe any data structure that permits both insertions and removals from either the front or the back of a collection. The <B><I><A HREF="../stdlibref/deque.html">deque</A></I></B> container class permits this and much more. In fact, the capabilities of the <B><I>deque</I></B> data structure are almost a union of those provided by the <B><I><A HREF="../stdlibref/vector.html">vector</A></I></B> and <B><I><A HREF="../stdlibref/list.html">list</A></I></B> classes.</P> |
| <P>Like a <B><I><A HREF="../stdlibref/vector.html">vector</A></I></B>, the <B><I><A HREF="../stdlibref/deque.html">deque</A></I></B> is an indexed collection. Values can be accessed by subscript, using the position within the collection as a key. This capability is not provided by the <B><I><A HREF="../stdlibref/list.html">list</A></I></B> class.</P> |
| <P>Like a <B><I><A HREF="../stdlibref/list.html">list</A></I></B>, however, values can be efficiently added either to the front or to the back of a <B><I><A HREF="../stdlibref/deque.html">deque</A></I></B>. This capability is provided only in part by the vector class.</P> |
| <P>As with both the <B><I><A HREF="../stdlibref/list.html">list</A></I></B> and <B><I><A HREF="../stdlibref/vector.html">vector</A></I></B> classes, insertions can be made into the middle of the sequence held by a <B><I><A HREF="../stdlibref/deque.html">deque</A></I></B>. Such insertion operations are not as efficient as with a <B><I>list</I></B>, but slightly more efficient that they are in a <B><I>vector</I></B>.</P> |
| <P>In short, a <B><I><A HREF="../stdlibref/deque.html">deque</A></I></B> can often be used in situations that require a <B><I><A HREF="../stdlibref/vector.html">vector</A></I></B> and in situations that require a <B><I><A HREF="../stdlibref/list.html">list</A></I></B>. Often, using a <B><I>deque</I></B> in place of either a <B><I>vector</I></B> or a <B><I>list</I></B> results in faster programs. To determine which data structure should be used, you can refer to the set of questions described in <A HREF="4-2.html">Section 4.2</A></P> |
| <A NAME="711"><H3>7.1.1 Include Files</H3></A> |
| <A NAME="idx123"><!></A> |
| <P>The <SAMP>deque</SAMP> header file must appear in all programs that use the <B><I><A HREF="../stdlibref/deque.html">deque</A></I></B> datatype:</P> |
| |
| <UL><PRE> |
| #include <deque> |
| </PRE></UL> |
| |
| <BR> |
| <HR> |
| <A HREF="7.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="7-2.html"><IMG SRC="images/bnext.gif" WIDTH=20 HEIGHT=21 ALT="Next file" BORDER=O></A> |
| |
| <!-- Google Analytics tracking code --> |
| <script src="http://www.google-analytics.com/urchin.js" type="text/javascript"> |
| </script> |
| <script type="text/javascript"> |
| _uacct = "UA-1775151-1"; |
| urchinTracker(); |
| </script> |
| <!-- end of Google Analytics tracking code --> |
| |
| </BODY> |
| </HTML> |