title: How would one push back an empty vector of pairs to another vector?
body: <pre><code>  std::vector&lt;std::vector&lt; std::pair&lt;int, int&gt; &gt; &gt; offset_table;
    for (int i = 0; i &lt; (offset.Width()*offset.Width()); ++i)
    {
      offset_table.push_back(  std::vector&lt; std::pair&lt;int, int&gt; &gt;  );
    }
  </code></pre>
  
  <p>This is my code, but I am getting the errors:</p>
  
  <pre><code>main.cpp: In function ‘void Compress(const Image&lt;Color&gt;&amp;, Image&lt;bool&gt;&amp;, Image&lt;Color&gt;&amp;, Image&lt;Offset&gt;&amp;)’:
  main.cpp:48:66: error: expected primary-expression before ‘)’ token
  </code></pre>
  
  <p>I do not want any values in the pairs, I just would like to have a vector of empty vectors at the moment. How would I do this?</p>