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adjacent_difference [C++ Reference]
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<h2><a name="adjacent_difference" id="adjacent_difference">adjacent_difference</a></h2>
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<p>
Syntax:
</p>
<pre class="c code c++" style="font-family:monospace;"> <span class="co2">#include <numeric></span>
output_iterator adjacent_difference<span class="br0">(</span> input_iterator start<span class="sy0">,</span> input_iterator end<span class="sy0">,</span> output_iterator result <span class="br0">)</span><span class="sy0">;</span>
output_iterator adjacent_difference<span class="br0">(</span> input_iterator start<span class="sy0">,</span> input_iterator end<span class="sy0">,</span> output_iterator result<span class="sy0">,</span> BinaryFunction f <span class="br0">)</span><span class="sy0">;</span></pre>
<p>
The adjacent_difference() function calculates the differences between adjacent
elements in the range [start,end) and stores the result starting at result.
(Specifically, the element at start will be copied to result; and then the difference
between the element at start + i and start + (i-1) will be stored at result + i.)
</p>
<p>
If a binary function f is given, it is used instead of the - operator to
compute the differences.
adjacent_difference() runs in <a href="../../complexity.html" class="wikilink1" title="complexity">linear time</a>.
</p>
<p>
Following example displays the differences between adjacent elements in a vector.
</p>
<pre class="c code c++" style="font-family:monospace;"> <span class="co2">#include <algorithm></span>
<span class="co2">#include <iostream></span>
<span class="co2">#include <iterator></span>
<span class="co2">#include <numeric></span>
<span class="co2">#include <vector></span>
<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span>
<span class="br0">{</span>
std<span class="sy0">::</span><span class="me2">vector</span><span class="sy0"><</span>int<span class="sy0">></span> v<span class="sy0">;</span>
<span class="kw1">for</span> <span class="br0">(</span><span class="kw4">int</span> i <span class="sy0">=</span> <span class="nu0">3</span><span class="sy0">;</span> i <span class="sy0"><=</span> <span class="nu0">10</span><span class="sy0">;</span> <span class="sy0">++</span>i<span class="br0">)</span>
v.<span class="me1">push_back</span><span class="br0">(</span>i<span class="br0">)</span><span class="sy0">;</span>
<span class="co1">// display elements of v</span>
std<span class="sy0">::</span><span class="me2">copy</span><span class="br0">(</span>v.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span><span class="sy0">,</span> v.<span class="me1">end</span><span class="br0">(</span><span class="br0">)</span><span class="sy0">,</span> std<span class="sy0">::</span><span class="me2">ostream_iterator</span><span class="sy0"><</span>int<span class="sy0">></span><span class="br0">(</span>std<span class="sy0">::</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">" "</span><span class="br0">)</span><span class="br0">)</span><span class="sy0">;</span>
std<span class="sy0">::</span><a href="http://www.opengroup.org/onlinepubs/009695399/functions/cout.html"><span class="kw3">cout</span></a> <span class="sy0"><<</span> std<span class="sy0">::</span><span class="me2">endl</span><span class="sy0">;</span>
<span class="co1">// display all differences between elements</span>
std<span class="sy0">::</span><span class="me2">adjacent_difference</span><span class="br0">(</span>v.<span class="me1">begin</span><span class="br0">(</span><span class="br0">)</span><span class="sy0">,</span> v.<span class="me1">end</span><span class="br0">(</span><span class="br0">)</span><span class="sy0">,</span> std<span class="sy0">::</span><span class="me2">ostream_iterator</span><span class="sy0"><</span>int<span class="sy0">></span><span class="br0">(</span>std<span class="sy0">::</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">" "</span><span class="br0">)</span><span class="br0">)</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>
When run, this code displays the following output:
</p>
<pre class="c code c++" style="font-family:monospace;"> <span class="nu0">3</span> <span class="nu0">4</span> <span class="nu0">5</span> <span class="nu0">6</span> <span class="nu0">7</span> <span class="nu0">8</span> <span class="nu0">9</span> <span class="nu0">10</span>
<span class="nu0">3</span> <span class="nu0">1</span> <span class="nu0">1</span> <span class="nu0">1</span> <span class="nu0">1</span> <span class="nu0">1</span> <span class="nu0">1</span> <span class="nu0">1</span></pre>
<p>
Related Topics: <a href="../../stl/algorithm/accumulate.html" class="wikilink1" title="stl:algorithm:accumulate">accumulate</a>, <a href="../../stl/algorithm/count.html" class="wikilink1" title="stl:algorithm:count">count</a>, <a href="../../stl/algorithm/inner_product.html" class="wikilink1" title="stl:algorithm:inner_product">inner_product</a>, <a href="../../stl/algorithm/partial_sum.html" class="wikilink1" title="stl:algorithm:partial_sum">partial_sum</a>
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