title: Why can't I emplace ifstreams in a vector?
body: <p>The following example program doesn't compile for me on either
  clang 3.1 or gcc 4.8:</p>
  
  <pre><code>#include &lt;fstream&gt;
  #include &lt;vector&gt;
  
  using namespace std;
  
  int main()
  {
      vector&lt;ifstream&gt; bla;
      bla.emplace_back("filename");
      return 0;
  }
  </code></pre>
  
  <p>However, I thought emplace_back should </p>
  
  <blockquote>
    <p>"Insert a new element at the end of the vector, right after its
    current last element. This new element is constructed in place using
    args as the arguments for its construction."</p>
  </blockquote>
  
  <p>Does anyone know why this doesn't compile then? did I misunderstand or are the library implementations not yet complete?</p>