title: gdb: show typeinfo of some data
body: <p>Basically, I want to get <code>typeid(*this).name()</code>, i.e. the real type of <code>this</code>.</p>
  
  <p>I want to get this in GDB (without modifying the source code). I tried <code>print typeid(*this)</code> but it says that <code>typeid</code> is unknown (because I didn't included it there in the source file).</p>