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<H1>rotate</H1>

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<TD Align=left VAlign=top><b>Category</b>: algorithms</TD>
<TD Align=right VAlign=top><b>Component type</b>: function</TD>
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</Table>

<h3>Prototype</h3>
<pre>
template &lt;class <A href="ForwardIterator.html">ForwardIterator</A>&gt;
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 pointed
to by <tt>middle</tt> is moved to the position <tt>first</tt>, the element pointed
to 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 two
ranges <tt>[first, middle)</tt> and <tt>[middle, last)</tt>.  Formally, for every
integer <tt>n</tt> such that <tt>0 &lt;= n &lt; 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 <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[] = &quot;abcdefghijklmnopqrstuvwxyz&quot;;
rotate(alpha, alpha + 13, alpha + 26);
printf(&quot;%s\n&quot;, 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> is
a valid range.
<P><A name="2">[2]</A>
<tt>Rotate</tt> uses a different algorithm depending on whether its
arguments are <A href="ForwardIterator.html">Forward Iterators</A>, <A href="BidirectionalIterator.html" tppabs="http://www.sgi.com/Technology/STL/BidirectionalIterator.shtml">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>

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