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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_copy</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_copy</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>, class <A href="OutputIterator.html">OutputIterator</A>>OutputIterator rotate_copy(ForwardIterator first, ForwardIterator middle, ForwardIterator last, OutputIterator result);</pre> <h3>Description</h3><tt>Rotate_copy</tt> copies elements from the range <tt>[first, last)</tt> to therange <tt>[result, result + (last - first))</tt> such that <tt>*middle</tt> iscopied to <tt>*result</tt>, <tt>*(middle + 1)</tt> is copied to <tt>*(result + 1)</tt>, andso on. Formally, for every integer <tt>n</tt> such that <tt>0 <= n < last -first</tt>, <tt>rotate_copy</tt> performs the assignment <tt>*(result + (n + (last -middle)) % (last - first)) = *(first + n)</tt>. <tt>Rotate_copy</tt> is similarto <tt><A href="copy.html">copy</A></tt> followed by <tt><A href="rotate.html">rotate</A></tt>, but is more efficient. Thereturn value is <tt>result + (last - first)</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>OutputIterator</tt> is a model of <A href="OutputIterator.html">Output Iterator</A>.<LI><tt>ForwardIterator</tt>'s value type is convertible to a type in <tt>OutputIterator</tt>'s set of value types.</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><LI>There is enough space to hold all of the elements being copied. More formally, the requirement is that <tt>[result, result + (last - first))</tt> is a valid range. <LI>The ranges <tt>[first, last)</tt> and <tt>[result, result + (last - first))</tt> do not overlap.</UL><h3>Complexity</h3>Linear. <tt>Rotate_copy</tt> performs exactly <tt>last - first</tt> assignments.<h3>Example</h3><pre>const char alpha[] = "abcdefghijklmnopqrstuvwxyz";rotate_copy(alpha, alpha + 13, alpha + 26, <A href="ostream_iterator.html">ostream_iterator</A><char>(cout));// 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.<h3>See also</h3><tt><A href="rotate.html">rotate</A></tt>, <tt><A href="copy.html">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> ⌨️ 快捷键说明
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