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shift [C++ Reference]
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<h2><a name="shift" id="shift">shift</a></h2>
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<p>
Syntax:
</p>
<pre class="c code c++" style="font-family:monospace;"> <span class="co2">#include <valarray></span>
valarray shift<span class="br0">(</span> size_t num <span class="br0">)</span> <span class="kw4">const</span><span class="sy0">;</span></pre>
<p>
The shift() function creates a new valarray, shifted left by num elements.
</p>
<p>
This function does not affect the previous contents of the valarray.
</p>
<p>
The following code will shift the elements left by 2 places:
</p>
<pre class="c code c++" style="font-family:monospace;"> <span class="co2">#include <valarray></span>
<span class="co2">#include <iostream></span>
std<span class="sy0">::</span><span class="me2">valarray</span><span class="sy0"><</span>int<span class="sy0">></span> v1 <span class="sy0">=</span> <span class="br0">{</span>1<span class="sy0">,</span>2<span class="sy0">,</span>3<span class="sy0">,</span>4<span class="sy0">,</span>5<span class="br0">}</span><span class="sy0">;</span>
<span class="kw1">for</span> <span class="br0">(</span>size_t i<span class="sy0">=</span><span class="nu0">0</span><span class="sy0">;</span> i<span class="sy0"><</span>v1.<span class="me1">size</span><span class="br0">(</span><span class="br0">)</span><span class="sy0">;</span> <span class="sy0">++</span>i<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> v1<span class="br0">[</span>i<span class="br0">]</span><span class="sy0">;</span>
std<span class="sy0">::</span><span class="me2">valarray</span><span class="sy0"><</span>int<span class="sy0">></span> v2 <span class="sy0">=</span> v1.<span class="me1">shift</span><span class="br0">(</span>2<span class="br0">)</span><span class="sy0">;</span>
<span class="kw1">for</span> <span class="br0">(</span>size_t i<span class="sy0">=</span><span class="nu0">0</span><span class="sy0">;</span> i<span class="sy0"><</span>v2.<span class="me1">size</span><span class="br0">(</span><span class="br0">)</span><span class="sy0">;</span> <span class="sy0">++</span>i<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> v2<span class="br0">[</span>i<span class="br0">]</span><span class="sy0">;</span>
<p>
Will produce this output:
</p>
<pre class="c code c++" style="font-family:monospace;"> <span class="nu0">12345</span>
<span class="nu0">345</span></pre>
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