title: Slicing std::array
body: <p>Is there an easy way to get a slice of an array in C++?</p>
  
  <p>I.e., I've got </p>
  
  <pre><code>array&lt;double, 10&gt; arr10;
  </code></pre>
  
  <p>and want to get array consisting of five first elements of <code>arr10</code>:</p>
  
  <pre><code>array&lt;double, 5&gt; arr5 = arr10.???
  </code></pre>
  
  <p>(other than populating it by iterating through first array)</p>