title: How do I upgrade to C++17?
body: <p>I am using Atom as my IDE, my current <code>__cplusplus = 201402</code> which is C++14 and my compiler is <em>g++ (GCC) 9.2.0</em>.</p>
  <p>How do I upgrade to C++17 or C++20?</p>
  <p>Everything I've searched up involves using another IDE (Microsoft Visual Studio).</p>