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137 lines
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<HTML>
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<HEAD>
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<TITLE>reverse()</TITLE>
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<LINK REL=StyleSheet HREF="../rw.css" TYPE="text/css" TITLE="Apache stdcxx Stylesheet"></HEAD>
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<BODY BGCOLOR=#FFFFFF>
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<A HREF="return-temporary-buffer.html"><IMG SRC="images/bprev.gif" WIDTH=20 HEIGHT=21 ALT="Previous file" BORDER=O></A><A HREF="noframes.html"><IMG SRC="images/btop.gif" WIDTH=56 HEIGHT=21 ALT="Top of Document" BORDER=O></A><A HREF="booktoc.html"><IMG SRC="images/btoc.gif" WIDTH=56 HEIGHT=21 ALT="Contents" BORDER=O></A><A HREF="tindex.html"><IMG SRC="images/bindex.gif" WIDTH=56 HEIGHT=21 ALT="Index page" BORDER=O></A><A HREF="reverse-copy.html"><IMG SRC="images/bnext.gif" WIDTH=25 HEIGHT=21 ALT="Next file" BORDER=O></A><DIV CLASS="DOCUMENTNAME"><B>Apache C++ Standard Library Reference Guide</B></DIV>
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<H2>reverse()</H2>
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<P><B>Library:</B> <A HREF="2-9.html">Algorithms</A></P>
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<PRE><HR><B><I>Function</I></B><HR></PRE>
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<UL>
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<LI><A HREF="#sec1">Local Index</A></LI>
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<LI><A HREF="#sec2">Summary</A></LI>
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<LI><A HREF="#sec3">Synopsis</A></LI>
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<LI><A HREF="#sec4">Description</A></LI>
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<LI><A HREF="#sec5">Complexity</A></LI>
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<LI><A HREF="#sec6">Example</A></LI>
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<LI><A HREF="#sec7">See Also</A></LI>
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<LI><A HREF="#sec8">Standards Conformance</A></LI>
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</UL>
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<A NAME="sec1"><H3>Local Index</H3></A>
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No Entries
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<A NAME="sec2"><H3>Summary</H3></A>
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<P>An algorithm that reverses the order of elements in a sequence</P>
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<A NAME="sec3"><H3>Synopsis</H3></A>
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<PRE>#include <algorithm>
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namespace std {
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template <class BidirectionalIterator>
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void reverse(BidirectionalIterator start,
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BidirectionalIterator finish);
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}
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</PRE>
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<A NAME="sec4"><H3>Description</H3></A>
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<P>The algorithm <SAMP>reverse()</SAMP> reverses the elements in a sequence so that the last element becomes the new first element, and the first element becomes the new last. For each non-negative integer <SAMP>i <= (finish - start)/2</SAMP>, <SAMP>reverse()</SAMP> applies <SAMP><A HREF="iter-swap.html">iter_swap()</A></SAMP> to all pairs of iterators <SAMP>start + I, (finish - I) - 1</SAMP>. </P>
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<A NAME="sec5"><H3>Complexity</H3></A>
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<P><SAMP>reverse()</SAMP> performs exactly <SAMP>(finish - start)/2</SAMP> swaps.</P>
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<A NAME="sec6"><H3>Example</H3></A>
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<UL><PRE>//
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// reverse.cpp
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//
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#include <algorithm> // for reverse, reverse_copy
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#include <vector> // for vector
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#include <iostream> // for cout, endl
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#include <iterator> // for ostream_iterator
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int main ()
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{
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typedef std::vector<int, std::allocator<int> > Vector;
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typedef std::ostream_iterator<int, char,
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std::char_traits<char> >
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Iter;
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// Initialize a vector with an array of integers.
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const Vector::value_type a[] = { 1, 2, 3, 4, 5,
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6, 7, 8, 9, 10 };
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Vector v (a + 0, a + sizeof a / sizeof *a);
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// Print out elements in original (sorted) order.
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std::cout << "Elements before reverse: \n ";
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std::copy (v.begin (), v.end (), Iter (std::cout, " "));
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// Reverse the ordering.
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std::reverse (v.begin (), v.end ());
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// Print out the reversed elements.
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std::cout << "\n\nElements after reverse: \n ";
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std::copy (v.begin (), v.end (), Iter (std::cout, " "));
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std::cout << "\n\nA reverse_copy to cout: \n ";
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std::reverse_copy (v.begin (), v.end (),
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Iter (std::cout, " "));
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std::cout << std::endl;
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return 0;
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}
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Program Output:
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</PRE></UL>
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<UL><PRE>Elements before reverse:
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1 2 3 4 5 6 7 8 9 10
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Elements after reverse:
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10 9 8 7 6 5 4 3 2 1
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A reverse_copy to cout:
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1 2 3 4 5 6 7 8 9 10
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</PRE></UL>
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<A NAME="sec7"><H3>See Also</H3></A>
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<P><SAMP><A HREF="reverse-copy.html">reverse_copy()</A></SAMP>, <SAMP><A HREF="swap.html">swap()</A></SAMP></P>
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<A NAME="sec8"><H3>Standards Conformance</H3></A>
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<P><I>ISO/IEC 14882:1998 -- International Standard for Information Systems -- Programming Language C++, Section 25.2.9</I></P>
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<BR>
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