title: va_list in C++ 64 Bits
body: <p>I work with VS2500 and now I want to compile my application under x64 bits but the compiler show me an error:</p>
  
  <pre><code>error C3861: '_INTSIZEOF': identifier was not found
  </code></pre>
  
  <p>What can I do to solve it?</p>