title: Comment blocks of code in c++
body: <p>I'm having difficulty formulating this question, and therefore, I can't search for the answer in google.
  My question is whether a function exists which can auto-comment/auto-uncomment blocks of code. Or is there a way to automatically remove or ignore certain lines when the code is built?</p>
  
  <p>Maybe it can be done with directives? </p>