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<HTML><!-- -- Copyright (c) 1996-1999 -- Silicon Graphics Computer Systems, Inc. -- -- Permission to use, copy, modify, distribute and sell this software -- and its documentation for any purpose is hereby granted without fee, -- provided that the above copyright notice appears in all copies and -- that both that copyright notice and this permission notice appear -- in supporting documentation. Silicon Graphics makes no -- representations about the suitability of this software for any -- purpose. It is provided "as is" without express or implied warranty. -- -- Copyright (c) 1994 -- Hewlett-Packard Company -- -- Permission to use, copy, modify, distribute and sell this software -- and its documentation for any purpose is hereby granted without fee, -- provided that the above copyright notice appears in all copies and -- that both that copyright notice and this permission notice appear -- in supporting documentation. Hewlett-Packard Company makes no -- representations about the suitability of this software for any -- purpose. It is provided "as is" without express or implied warranty. -- --><Head><Title>rotate</Title><!-- Generated by htmldoc --></HEAD><BODY BGCOLOR="#ffffff" LINK="#0000ee" TEXT="#000000" VLINK="#551a8b" ALINK="#ff0000"> <IMG SRC="CorpID.gif" ALT="SGI" HEIGHT="43" WIDTH="151"> <!--end header--><BR Clear><H1>rotate</H1><Table CellPadding=0 CellSpacing=0 width=100%><TR><TD Align=left><Img src = "algorithms.gif" Alt="" WIDTH = "194" HEIGHT = "38" ></TD><TD Align=right><Img src = "function.gif" Alt="" WIDTH = "194" HEIGHT = "38" ></TD></TR><TR><TD Align=left VAlign=top><b>Category</b>: algorithms</TD><TD Align=right VAlign=top><b>Component type</b>: function</TD></TR></Table><h3>Prototype</h3><pre>template <class <A href="ForwardIterator.html">ForwardIterator</A>>inline ForwardIterator rotate(ForwardIterator first, ForwardIterator middle, ForwardIterator last);</pre> <h3>Description</h3><tt>Rotate</tt> rotates the elements in a range. That is, the element pointedto by <tt>middle</tt> is moved to the position <tt>first</tt>, the element pointedto by <tt>middle + 1</tt> is moved to the position <tt>first + 1</tt>, and so on.One way to think about this operation is that it exchanges the tworanges <tt>[first, middle)</tt> and <tt>[middle, last)</tt>. Formally, for everyinteger <tt>n</tt> such that <tt>0 <= n < last - first</tt>, the element<tt>*(first + n)</tt> is assigned to <tt>*(first + (n + (last - middle)) % (last- first))</tt>. <tt>Rotate</tt> returns <tt>first + (last - middle)</tt>.<h3>Definition</h3>Defined in the standard header <A href="algorithm">algorithm</A>, and in the nonstandardbackward-compatibility header <A href="algo.h">algo.h</A>.<h3>Requirements on types</h3><UL><LI><tt>ForwardIterator</tt> is a model of <A href="ForwardIterator.html">Forward Iterator</A>.<LI><tt>ForwardIterator</tt> is mutable.</UL><h3>Preconditions</h3><UL><LI><tt>[first, middle)</tt> is a valid range.<LI><tt>[middle, last)</tt> is a valid range. <A href="#1">[1]</A></UL><h3>Complexity</h3>Linear. At most <tt>last - first</tt> swaps are performed. <A href="#2">[2]</A><h3>Example</h3><pre>char alpha[] = "abcdefghijklmnopqrstuvwxyz";rotate(alpha, alpha + 13, alpha + 26);printf("%s\n", alpha);// The output is nopqrstuvwxyzabcdefghijklm</pre><h3>Notes</h3><P><A name="1">[1]</A>It follows from these two requirements that <tt>[first, last)</tt> isa valid range.<P><A name="2">[2]</A><tt>Rotate</tt> uses a different algorithm depending on whether itsarguments are <A href="ForwardIterator.html">Forward Iterators</A>, <A href="BidirectionalIterator.html">Bidirectional Iterators</A>,or <A href="RandomAccessIterator.html">Random Access Iterators</A>. All three algorithms, however,are linear.<h3>See also</h3><tt><A href="rotate_copy.html">rotate_copy</A></tt><!--start footer--> <HR SIZE="6"><A href="http://www.sgi.com/"><IMG SRC="surf.gif" HEIGHT="54" WIDTH="54" ALT="[Silicon Surf]"></A><A HREF="index.html"><IMG SRC="stl_home.gif" HEIGHT="54" WIDTH="54" ALT="[STL Home]"></A><BR><FONT SIZE="-2"><A href="http://www.sgi.com/Misc/sgi_info.html" TARGET="_top">Copyright © 1999 Silicon Graphics, Inc.</A> All Rights Reserved.</FONT><FONT SIZE="-3"><a href="http://www.sgi.com/Misc/external.list.html" TARGET="_top">TrademarkInformation</A></FONT><P></BODY></HTML> ?? 快捷鍵說明
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