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set_symmetric_difference [C++ Reference]
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<h2><a name="set_symmetric_difference" id="set_symmetric_difference">set_symmetric_difference</a></h2>
<div class="level2">
<p>
Syntax:
</p>
<pre class="c code c++" style="font-family:monospace;"> <span class="co2">#include <algorithm></span>
output_iterator set_symmetric_difference<span class="br0">(</span> input_iterator start1<span class="sy0">,</span> input_iterator end1<span class="sy0">,</span> input_iterator2 start2<span class="sy0">,</span> input_iterator2 end2<span class="sy0">,</span> output_iterator result <span class="br0">)</span><span class="sy0">;</span>
output_iterator set_symmetric_difference<span class="br0">(</span> input_iterator start1<span class="sy0">,</span> input_iterator end1<span class="sy0">,</span> input_iterator2 start2<span class="sy0">,</span> input_iterator2 end2<span class="sy0">,</span> output_iterator result<span class="sy0">,</span> StrictWeakOrdering cmp <span class="br0">)</span><span class="sy0">;</span></pre>
<p>
The set_symmetric_difference() algorithm computes the symmetric difference of
the two sets defined by [start1,end1) and [start2,end2) and stores the
difference starting at result.
</p>
<p>
Both of the sets, given as ranges, must be sorted in ascending order.
</p>
<p>
The return value of set_symmetric_difference() is an iterator to the end of the
result range.
</p>
<p>
If the strict weak ordering comparison function object cmp is not specified,
set_symmetric_difference() will use the < operator to compare elements.
</p>
<p>
Example
</p>
<pre class="c code c++" style="font-family:monospace;"><span class="co1">// set_symmetric_difference example</span>
<span class="co2">#include <iostream></span>
<span class="co2">#include <algorithm></span>
<span class="co2">#include <vector></span>
using namespace std<span class="sy0">;</span>
<span class="kw4">int</span> main <span class="br0">(</span><span class="br0">)</span> <span class="br0">{</span>
<span class="kw4">int</span> first<span class="br0">[</span><span class="br0">]</span> <span class="sy0">=</span> <span class="br0">{</span>5<span class="sy0">,</span>10<span class="sy0">,</span>15<span class="sy0">,</span>20<span class="sy0">,</span>25<span class="br0">}</span><span class="sy0">;</span>
<span class="kw4">int</span> second<span class="br0">[</span><span class="br0">]</span> <span class="sy0">=</span> <span class="br0">{</span>50<span class="sy0">,</span>40<span class="sy0">,</span>30<span class="sy0">,</span>20<span class="sy0">,</span>10<span class="br0">}</span><span class="sy0">;</span>
vector<span class="sy0"><</span>int<span class="sy0">></span> v<span class="br0">(</span>10<span class="br0">)</span><span class="sy0">;</span> <span class="co1">// 0 0 0 0 0 0 0 0 0 0</span>
vector<span class="sy0"><</span>int<span class="sy0">>::</span><span class="me2">iterator</span> it<span class="sy0">;</span>
sort <span class="br0">(</span>first<span class="sy0">,</span>first<span class="sy0">+</span>5<span class="br0">)</span><span class="sy0">;</span> <span class="co1">// 5 10 15 20 25</span>
sort <span class="br0">(</span>second<span class="sy0">,</span>second<span class="sy0">+</span>5<span class="br0">)</span><span class="sy0">;</span> <span class="co1">// 10 20 30 40 50</span>
it<span class="sy0">=</span>set_symmetric_difference <span class="br0">(</span>first<span class="sy0">,</span> first<span class="sy0">+</span>5<span class="sy0">,</span> second<span class="sy0">,</span> second<span class="sy0">+</span>5<span class="sy0">,</span> v.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span><span class="sy0">;</span>
<span class="co1">// 5 15 25 30 40 50 0 0 0 0</span>
<a href="http://www.opengroup.org/onlinepubs/009695399/functions/cout.html"><span class="kw3">cout</span></a> <span class="sy0"><<</span> <span class="st0">"symmetric difference has "</span> <span class="sy0"><<</span> <span class="kw4">int</span><span class="br0">(</span>it <span class="sy0">-</span> v.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span><span class="br0">)</span> <span class="sy0"><<</span> <span class="st0">" elements.<span class="es1">\n</span>"</span><span class="sy0">;</span>
<span class="kw1">return</span> <span class="nu0">0</span><span class="sy0">;</span>
<span class="br0">}</span></pre>
<p>
Output:
symmetric difference has 6 elements
</p>
<p>
Related Topics: <a href="../../stl/algorithm/includes.html" class="wikilink1" title="stl:algorithm:includes">includes</a>, <a href="../../stl/algorithm/set_difference.html" class="wikilink1" title="stl:algorithm:set_difference">set_difference</a>, <a href="../../stl/algorithm/set_intersection.html" class="wikilink1" title="stl:algorithm:set_intersection">set_intersection</a>, <a href="../../stl/algorithm/set_union.html" class="wikilink1" title="stl:algorithm:set_union">set_union</a>
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