title: what does __declspec(dllimport) really mean?
body: <p>I saw the Qt source code like this:</p>
  
  <pre><code>class Q_CORE_EXPORT QBasicAtomicInt
  {
  public:
  ...
  };
  </code></pre>
  
  <p>Which <code>Q_CORE_EXPORT</code> macro defines like below:</p>
  
  <pre><code>define Q_DECL_IMPORT __declspec(dllimport)
  </code></pre>
  
  <p>So what does <code>__declspec(dllimport)</code> really mean?</p>