title: Why can't I multi-declare a class
body: <p>I can do this </p>
  
  <pre><code>extern int i;
  extern int i;
  </code></pre>
  
  <p>But I can't do the same with a class</p>
  
  <pre><code>class A {
  ..
  }
  class A {
  ..
  }
  </code></pre>
  
  <p>While in both cases no memory is being allocated.</p>