title: 'std::pair' : use of class template requires template argument list
body: <p>I'm trying to create an unordered_map whose key would be a member of the Gdiplus::Color class and a float but i can't figure why i can't do this. This is my declaration</p>
  
  <pre><code>std::unordered_map&lt;std::pair(Gdiplus::Color, float), std::shared_ptr&lt;Gdiplus::Pen&gt;&gt; mymap;
  </code></pre>