title: Data member 'queryCallback' cannot be a member template
body: <p>I'm having problems to compile the following member definition:</p>
  
  <pre><code>template&lt;typename... A&gt;
  std::tuple&lt;std::string, std::function&lt;void(A...)&gt; &gt; queryCallback;
  </code></pre>
  
  <p>Error is as stated in the title:</p>
  
  <pre><code>/databasedispatcher.h:14: error: data member 'queryCallback' cannot be a member template
  </code></pre>
  
  <p>I realize I can't use a template definition for a member that is not a method/function. Considering that, how can I use <code>&lt;A...&gt;</code> in this case?</p>
  
  <p>Thank you.</p>