title: How to pass an array of vectors by reference?
body: <pre><code>#include &lt;vector&gt;
  using std::vector;
  
  int main(void)
  {
      vector&lt;int&gt; gr[10];
  
      function(gr);
  }
  </code></pre>
  
  <p>How should I define that function calling by reference rather than by value?</p>