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<HTML><HEAD><TITLE>7.2 Deque Operations</TITLE></HEAD><BODY><A HREF="ug1.htm"><IMG SRC="images/banner.gif"></A><BR><A HREF="deq_0575.htm"><IMG SRC="images/prev.gif"></A><A HREF="booktoc1.htm"><IMG SRC="images/toc.gif"></A><A HREF="tindex1.htm"><IMG SRC="images/tindex.gif"></A><A HREF="exa_6226.htm"><IMG SRC="images/next.gif"></A><BR><STRONG>Click on the banner to return to the user guide home page.</STRONG><H2>7.2 Deque Operations</H2><P>A <A HREF="../stdlibcr/deq_4164.htm"><B><I>deque</I></B></A> is declared in the same fashion as a <A HREF="../stdlibcr/vec_0251.htm"><B><I>vector</I></B></A>, and includes within the class the same type definitions as vector.</P><P>The <SAMP>begin()</SAMP> and <SAMP>end()</SAMP> member functions return random access iterators, rather than bidirectional iterators, as they do for lists.</P><P>An insertion (either <SAMP>insert(),</SAMP> <SAMP>push_front(),</SAMP> or <SAMP>push_back()</SAMP>) can potentially invalidate all outstanding iterators and references to elements in the deque. As with the vector data type, this is a much more restrictive condition than insertions into a list.</P><P>If the underlying element type provides a destructor, then the destructor will be invoked when a value is erased from a deque.</P><P>Since the deque data type provides random access iterators, all the generic algorithms that operate with vectors can also be used with deques.</P><P>A vector holds elements in a single large block of memory. A deque, on the other hand, uses a number of smaller blocks. This may be important on systems that restrict the size of memory blocks, as it will permit a deque to hold many more elements than a vector.</P><P>As values are inserted, the index associated with any particular element in the collection will change. For example, if a value is inserted into position 3, then the value formerly indexed by 3 will now be found at index location 4, the value formerly at 4 will be found at index location 5, and so on.</P><HR><A HREF="deq_0575.htm"><IMG SRC="images/prev.gif"></A> <A HREF="booktoc1.htm"><IMG SRC="images/toc.gif"></A><A HREF="tindex1.htm"><IMG SRC="images/tindex.gif"></A><A HREF="exa_6226.htm"><IMG SRC="images/next.gif"></A><P>©Copyright 1996, Rogue Wave Software, Inc.</P></BODY></HTML>?? 快捷鍵說明
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