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<Head>
<Title>reverse_copy</Title>
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<H1>reverse_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>
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<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="BidirectionalIterator.html">BidirectionalIterator</A>, class <A href="OutputIterator.html">OutputIterator</A>>
OutputIterator reverse_copy(BidirectionalIterator first,
BidirectionalIterator last,
OutputIterator result);
</pre>
<h3>Description</h3>
<tt>Reverse_copy</tt> copies elements from the range <tt>[first, last)</tt>
to the range <tt>[result, result + (last - first))</tt> such that the
copy is a reverse of the original range. Specifically: for
every <tt>i</tt> such that <tt>0 <= i < (last - first)</tt>, <tt>reverse_copy</tt>
performs the assignment <tt>*(result + (last - first) - i) =
*(first + i)</tt>.
<P>
The return value is <tt>result + (last - first)</tt>.
<h3>Definition</h3>
Defined in the standard header <A href="algorithm">algorithm</A>, and in the nonstandard
backward-compatibility header <A href="algo.h">algo.h</A>.
<h3>Requirements on types</h3>
<UL>
<LI>
BidirectionalIterator is a model of <A href="BidirectionalIterator.html">Bidirectional Iterator</A>.
<LI>
OutputIterator is a model of <A href="OutputIterator.html">Output Iterator</A>.
<LI>
The value type of BidirectionalIterator is convertible to a
type in OutputIterator's set of value types.
</UL>
<h3>Preconditions</h3>
<UL>
<LI>
<tt>[first, last)</tt> is a valid range.
<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: exactly <tt>last - first</tt> assignments.
<h3>Example</h3>
<pre>
<A href="Vector.html">vector</A><int> V;
V.push_back(0);
V.push_back(1);
V.push_back(2);
<A href="copy.html">copy</A>(V.begin(), V.end(), <A href="ostream_iterator.html">ostream_iterator</A><int>(cout, " "));
// Output: 0 1 2
<A href="List.html">list</A><int> L(V.size());
reverse_copy(V.begin(), V.end(), L.begin());
<A href="copy.html">copy</A>(L.begin(), L.end(), <A href="ostream_iterator.html">ostream_iterator</A><int>(cout, " "));
// Output: 2 1 0
</pre>
<h3>Notes</h3>
<h3>See also</h3>
<tt><A href="reverse.html">reverse</A></tt>, <tt><A href="copy.html">copy</A></tt>
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