title: global vector C++
body: <p>Is it possible to have a vector as a global variable is C++?
  Like this:</p>
  
  <pre><code>class system {...};
  vector&lt;system&gt; systems;
  </code></pre>
  
  <p>when I try to compile this I get an error. The compiler I'm using is gcc and I'm compiling as C++.</p>