title: How to use vector::push_back()` with a struct?
body: <p>How can I <code>push_back</code> a <code>struct</code> into a vector?</p>
  
  <pre><code>struct point {
      int x;
      int y;
  };
  
  std::vector&lt;point&gt; a;
  
  a.push_back( ??? );
  </code></pre>