title: What is meant with "const" at end of function declaration?
body: <p>I got a book, where there is written something like:</p>
  
  <pre><code>class Foo 
  {
  public:
      int Bar(int random_arg) const
      {
          // code
      }
  };
  </code></pre>
  
  <p>What does it mean?</p>