title: C union type in Swift?
body: <p>How can I declare and use a C union type in Swift?</p>
  
  <p>I tried:</p>
  
  <pre><code>var value: union {
        var output: CLongLong
        var input: [CInt]
      }
  </code></pre>
  
  <p>but it does not work...</p>
  
  <p>UPDATED: I want to use union to split a <code>8 bytes number</code> to 2 x <code>4 bytes number</code>.</p>