title: Customizing include-guard for Eclipse CDT
body: <p>I want an automatically generated include-guard by creating a new C++-class with Eclipse/CDT, but I don't find any way to change the <code>${include_guard_symbol}</code> attribute.</p>
  
  <p>My wish is an include-guard with a namespace prefix like following:</p>
  
  <pre><code>#ifndef NAMSPACE1_NAMESPACE2_HEADER_HPP
  </code></pre>
  
  <p>But if I use <code>#ifndef ${namespace_name}_${include_guard_symbol}</code> for this, it will produce:</p>
  
  <pre><code>namepace1::namespace2::_HEADER_HPP
  </code></pre>
  
  <p>How can I do this?</p>