title: Most necessary #pragma-s?
body: <p><strong>Hi there, got a question.</strong></p>
  <p>Im learning C++ half-o-year, and trying to understand preprocessor directives, so, I've learnt about #pragma, and know what #pragma once does.</p>
  <p>I've seen many pro-C++ programmer's videos, where he is using more than this directive.</p>
  <p>So, question is: What #pragma-s are most useful, which is necessary to use in GUI applications and which is necessary ones in CLI applications?</p>
  <p>I've tried to search on the internet, but didn't found anything really useful.<br />
  <em>39 buried, 0 found...</em></p>
  <p>Thanks :)</p>