title: Does sizeof evaluate at compile-time or runtime?
body: <p>I am confused about the evaluation time of <code>sizeof</code> operator.<br>
  When does the sizeof operator get evaluated?    </p>
  
  <p>Does its evaluation time (compile-time or runtime) depend on the language (C? C++?)?</p>
  
  <p>Can we use <code>sizeof</code> in case of objects created at runtime in C++?</p>