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| <TITLE>reverse()</TITLE> |
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| <H2>reverse()</H2> |
| <P><B>Library:</B> <A HREF="2-9.html">Algorithms</A></P> |
| |
| <PRE><HR><B><I>Function</I></B><HR></PRE> |
| |
| <UL> |
| <LI><A HREF="#sec1">Local Index</A></LI> |
| <LI><A HREF="#sec2">Summary</A></LI> |
| <LI><A HREF="#sec3">Synopsis</A></LI> |
| <LI><A HREF="#sec4">Description</A></LI> |
| <LI><A HREF="#sec5">Complexity</A></LI> |
| <LI><A HREF="#sec6">Example</A></LI> |
| <LI><A HREF="#sec7">See Also</A></LI> |
| <LI><A HREF="#sec8">Standards Conformance</A></LI> |
| </UL> |
| <A NAME="sec1"><H3>Local Index</H3></A> |
| No Entries |
| <A NAME="sec2"><H3>Summary</H3></A> |
| <P>An algorithm that reverses the order of elements in a sequence</P> |
| <A NAME="sec3"><H3>Synopsis</H3></A> |
| |
| <PRE>#include <algorithm> |
| |
| namespace std { |
| template <class BidirectionalIterator> |
| void reverse(BidirectionalIterator start, |
| BidirectionalIterator finish); |
| } |
| </PRE> |
| <A NAME="sec4"><H3>Description</H3></A> |
| <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> |
| <A NAME="sec5"><H3>Complexity</H3></A> |
| <P><SAMP>reverse()</SAMP> performs exactly <SAMP>(finish - start)/2</SAMP> swaps.</P> |
| <A NAME="sec6"><H3>Example</H3></A> |
| |
| <UL><PRE>// |
| // reverse.cpp |
| // |
| |
| #include <algorithm> // for reverse, reverse_copy |
| #include <vector> // for vector |
| #include <iostream> // for cout, endl |
| #include <iterator> // for ostream_iterator |
| |
| |
| |
| int main () |
| { |
| typedef std::vector<int, std::allocator<int> > Vector; |
| typedef std::ostream_iterator<int, char, |
| std::char_traits<char> > |
| Iter; |
| |
| // Initialize a vector with an array of integers. |
| const Vector::value_type a[] = { 1, 2, 3, 4, 5, |
| 6, 7, 8, 9, 10 }; |
| |
| Vector v (a + 0, a + sizeof a / sizeof *a); |
| |
| // Print out elements in original (sorted) order. |
| std::cout << "Elements before reverse: \n "; |
| std::copy (v.begin (), v.end (), Iter (std::cout, " ")); |
| |
| // Reverse the ordering. |
| std::reverse (v.begin (), v.end ()); |
| |
| // Print out the reversed elements. |
| std::cout << "\n\nElements after reverse: \n "; |
| std::copy (v.begin (), v.end (), Iter (std::cout, " ")); |
| |
| std::cout << "\n\nA reverse_copy to cout: \n "; |
| std::reverse_copy (v.begin (), v.end (), |
| Iter (std::cout, " ")); |
| std::cout << std::endl; |
| |
| return 0; |
| } |
| |
| |
| Program Output: |
| </PRE></UL> |
| <UL><PRE>Elements before reverse: |
| 1 2 3 4 5 6 7 8 9 10 |
| |
| Elements after reverse: |
| 10 9 8 7 6 5 4 3 2 1 |
| |
| A reverse_copy to cout: |
| 1 2 3 4 5 6 7 8 9 10 |
| </PRE></UL> |
| <A NAME="sec7"><H3>See Also</H3></A> |
| <P><SAMP><A HREF="reverse-copy.html">reverse_copy()</A></SAMP>, <SAMP><A HREF="swap.html">swap()</A></SAMP></P> |
| <A NAME="sec8"><H3>Standards Conformance</H3></A> |
| <P><I>ISO/IEC 14882:1998 -- International Standard for Information Systems -- Programming Language C++, Section 25.2.9</I></P> |
| |
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