doc/stdlibref/set-symmetric-difference.html - stdcxx - Git at Google

 <HTML>
 <HEAD>
 <TITLE>set_symmetric_difference()</TITLE>
 <LINK REL=StyleSheet HREF="../rw.css" TYPE="text/css" TITLE="Apache stdcxx Stylesheet"></HEAD>
 <BODY BGCOLOR=#FFFFFF>
 <A HREF="set-intersection.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="set-union.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>
 <H2>set_symmetric_difference()</H2>
 <P><B>Library:</B>&nbsp;&nbsp;<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>A basic set operation (algorithm) for constructing a sorted symmetric difference</P>
 <A NAME="sec3"><H3>Synopsis</H3></A>

 <PRE>#include &lt;algorithm&gt;

 namespace std {
   template &lt;class InputIterator1, class InputIterator2,
             class OutputIterator&gt;
   OutputIterator
   set_symmetric_difference(InputIterator1 start1,
                            InputIterator1 finish1,
                            InputIterator2 start2,
                            InputIterator2 finish2,
                            OutputIterator result);

   template &lt;class InputIterator1, class InputIterator2,
             class OutputIterator, class Compare&gt;
   OutputIterator
   set_symmetric_difference(InputIterator1 start1,
                            InputIterator1 finish1,
                            InputIterator2 start2,
                            InputIterator2 finish2,
                            OutputIterator result,
                            Compare comp);
 }
 </PRE>
 <A NAME="sec4"><H3>Description</H3></A>
 <P>The algorithm <SAMP>set_symmetric_difference()</SAMP> constructs a sorted symmetric difference of the elements from the two ranges. This means that the constructed range includes copies of the elements that are present in the range <SAMP>[start1, finish1)</SAMP> (but not present in the range <SAMP>[start2, finish2)</SAMP>) <I>and</I> copies of the elements that are present in the range <SAMP>[start2, finish2)</SAMP> (but not in the range <SAMP>[start1, finish1)</SAMP>). It returns the end of the constructed range. </P>
 <P>For example, suppose we have two sets:</P>
 <P><SAMP>1 2 3 4 5</SAMP></P>
 <P>and</P>
 <P><SAMP>3 4 5 6 7</SAMP></P>
 <P>The <SAMP>set_symmetric_difference()</SAMP> of these two sets is:</P>
 <P><SAMP>1 2 6 7</SAMP></P>
 <P>The result of <SAMP>set_symmetric_difference()</SAMP> is undefined if the result range overlaps with either of the original ranges. </P>
 <P><SAMP>set_symmetric_difference()</SAMP> assumes that the ranges are sorted using <SAMP>operator&lt;()</SAMP>, unless an alternative comparison function object (<SAMP>comp</SAMP>) is provided. </P>
 <P>Use the <SAMP>set_symmetric_difference()</SAMP> algorithm to obtain a result that includes elements that are present in the first set and not in the second.</P>
 <A NAME="sec5"><H3>Complexity</H3></A>
 <P>At most <SAMP>((finish1 - start1) + (finish2 - start2)) * 2 -1</SAMP> comparisons are performed.</P>
 <A NAME="sec6"><H3>Example</H3></A>

 <UL><PRE>//
 //  set_s_di.cpp
 //

 #include &lt;algorithm&gt;
 #include &lt;set&gt;
 #include &lt;iostream&gt;

 int main ()
 {
 #ifndef _RWSTD_NO_NAMESPACE
   using namespace std;
 #endif


   // Initialize some sets.

   int a1[] = {1,3,5,7,9,11};
   int a3[] = {3,5,7,8};
   set&lt;int, less&lt;int&gt;,allocator&lt;int&gt;  &gt; odd(a1+0, a1+6),
                                        result,
                                        smalll(a3+0, a3+4);

   // Create an insert_iterator for result.

   insert_iterator&lt;set&lt;int, less&lt;int&gt;,allocator&lt;int&gt; &gt; &gt;
                  res_ins(result, result.begin());

   // Demonstrate set_symmetric_difference.

   cout &lt;&lt; "The symmetric difference of:" &lt;&lt; endl &lt;&lt; "{";
   copy(smalll.begin(),smalll.end(),
        ostream_iterator&lt;int,char,char_traits&lt;char&gt; &gt;
                        (cout," "));
   cout &lt;&lt; "} with {";
   copy(odd.begin(),odd.end(),
        ostream_iterator&lt;int,char,char_traits&lt;char&gt; &gt;
                        (cout," "));
   cout &lt;&lt; "} =" &lt;&lt; endl &lt;&lt; "{";
   set_symmetric_difference(smalll.begin(), smalll.end(),
                            odd.begin(), odd.end(), res_ins);
   copy(result.begin(),result.end(),
        ostream_iterator&lt;int,char,char_traits&lt;char&gt; &gt;
                        (cout," "));
   cout &lt;&lt; "}" &lt;&lt; endl &lt;&lt; endl;

   return 0;
 }


 Program Output:
 </PRE></UL>
 <UL><PRE>The symmetric difference of:
 {3 5 7 8 } with {1 3 5 7 9 11 } =
 {1 8 9 11 }

 </PRE></UL>
 <A NAME="sec7"><H3>See Also</H3></A>
 <P><SAMP><A HREF="includes.html">includes()</A></SAMP>, <A HREF="iterators.html">Iterators</A>, <SAMP><A HREF="set-union.html">set_union()</A></SAMP>, <SAMP><A HREF="set-intersection.html">set_intersection()</A></SAMP>, <SAMP><A HREF="set-difference.html">set_difference()</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 25.3.5.5</I></P>

 <BR>
 <HR>
 <A HREF="set-intersection.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="set-union.html"><IMG SRC="images/bnext.gif" WIDTH=20 HEIGHT=21 ALT="Next file" BORDER=O></A>

 <!-- Google Analytics tracking code -->
 <script src="http://www.google-analytics.com/urchin.js" type="text/javascript">
 </script>
 <script type="text/javascript">
     _uacct = "UA-1775151-1";
     urchinTracker();
 </script>
 <!-- end of Google Analytics tracking code -->

 </BODY>
 </HTML>
	<HTML>
	<HEAD>
	<TITLE>set_symmetric_difference()</TITLE>
	<LINK REL=StyleSheet HREF="../rw.css" TYPE="text/css" TITLE="Apache stdcxx Stylesheet"></HEAD>
	<BODY BGCOLOR=#FFFFFF>
	<A HREF="set-intersection.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="set-union.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>
	<H2>set_symmetric_difference()</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>A basic set operation (algorithm) for constructing a sorted symmetric difference</P>
	<A NAME="sec3"><H3>Synopsis</H3></A>

	<PRE>#include <algorithm>

	namespace std {
	template <class InputIterator1, class InputIterator2,
	class OutputIterator>
	OutputIterator
	set_symmetric_difference(InputIterator1 start1,
	InputIterator1 finish1,
	InputIterator2 start2,
	InputIterator2 finish2,
	OutputIterator result);

	template <class InputIterator1, class InputIterator2,
	class OutputIterator, class Compare>
	OutputIterator
	set_symmetric_difference(InputIterator1 start1,
	InputIterator1 finish1,
	InputIterator2 start2,
	InputIterator2 finish2,
	OutputIterator result,
	Compare comp);
	}
	</PRE>
	<A NAME="sec4"><H3>Description</H3></A>
	<P>The algorithm <SAMP>set_symmetric_difference()</SAMP> constructs a sorted symmetric difference of the elements from the two ranges. This means that the constructed range includes copies of the elements that are present in the range <SAMP>[start1, finish1)</SAMP> (but not present in the range <SAMP>[start2, finish2)</SAMP>) <I>and</I> copies of the elements that are present in the range <SAMP>[start2, finish2)</SAMP> (but not in the range <SAMP>[start1, finish1)</SAMP>). It returns the end of the constructed range. </P>
	<P>For example, suppose we have two sets:</P>
	<P><SAMP>1 2 3 4 5</SAMP></P>
	<P>and</P>
	<P><SAMP>3 4 5 6 7</SAMP></P>
	<P>The <SAMP>set_symmetric_difference()</SAMP> of these two sets is:</P>
	<P><SAMP>1 2 6 7</SAMP></P>
	<P>The result of <SAMP>set_symmetric_difference()</SAMP> is undefined if the result range overlaps with either of the original ranges. </P>
	<P><SAMP>set_symmetric_difference()</SAMP> assumes that the ranges are sorted using <SAMP>operator<()</SAMP>, unless an alternative comparison function object (<SAMP>comp</SAMP>) is provided. </P>
	<P>Use the <SAMP>set_symmetric_difference()</SAMP> algorithm to obtain a result that includes elements that are present in the first set and not in the second.</P>
	<A NAME="sec5"><H3>Complexity</H3></A>
	<P>At most <SAMP>((finish1 - start1) + (finish2 - start2)) * 2 -1</SAMP> comparisons are performed.</P>
	<A NAME="sec6"><H3>Example</H3></A>

	<UL><PRE>//
	// set_s_di.cpp
	//

	#include <algorithm>
	#include <set>
	#include <iostream>

	int main ()
	{
	#ifndef _RWSTD_NO_NAMESPACE
	using namespace std;
	#endif


	// Initialize some sets.

	int a1[] = {1,3,5,7,9,11};
	int a3[] = {3,5,7,8};
	set<int, less<int>,allocator<int> > odd(a1+0, a1+6),
	result,
	smalll(a3+0, a3+4);

	// Create an insert_iterator for result.

	insert_iterator<set<int, less<int>,allocator<int> > >
	res_ins(result, result.begin());

	// Demonstrate set_symmetric_difference.

	cout << "The symmetric difference of:" << endl << "{";
	copy(smalll.begin(),smalll.end(),
	ostream_iterator<int,char,char_traits<char> >
	(cout," "));
	cout << "} with {";
	copy(odd.begin(),odd.end(),
	ostream_iterator<int,char,char_traits<char> >
	(cout," "));
	cout << "} =" << endl << "{";
	set_symmetric_difference(smalll.begin(), smalll.end(),
	odd.begin(), odd.end(), res_ins);
	copy(result.begin(),result.end(),
	ostream_iterator<int,char,char_traits<char> >
	(cout," "));
	cout << "}" << endl << endl;

	return 0;
	}


	Program Output:
	</PRE></UL>
	<UL><PRE>The symmetric difference of:
	{3 5 7 8 } with {1 3 5 7 9 11 } =
	{1 8 9 11 }

	</PRE></UL>
	<A NAME="sec7"><H3>See Also</H3></A>
	<P><SAMP><A HREF="includes.html">includes()</A></SAMP>, <A HREF="iterators.html">Iterators</A>, <SAMP><A HREF="set-union.html">set_union()</A></SAMP>, <SAMP><A HREF="set-intersection.html">set_intersection()</A></SAMP>, <SAMP><A HREF="set-difference.html">set_difference()</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 25.3.5.5</I></P>

	<BR>
	<HR>
	<A HREF="set-intersection.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="set-union.html"><IMG SRC="images/bnext.gif" WIDTH=20 HEIGHT=21 ALT="Next file" BORDER=O></A>

	<!-- Google Analytics tracking code -->
	<script src="http://www.google-analytics.com/urchin.js" type="text/javascript">
	</script>
	<script type="text/javascript">
	_uacct = "UA-1775151-1";
	urchinTracker();
	</script>
	<!-- end of Google Analytics tracking code -->

	</BODY>
	</HTML>