title: "error: no match for operator==" when checking the value of a string
body: <p>How can I check if string is equal to '♦'?</p>
  
  <p>Setting <strong>some_string</strong> to <strong>4</strong> and printing like this:</p>
  
  <pre><code>some_string = 4;
  cout &lt;&lt; some_string;
  </code></pre>
  
  <p>shows me this:</p>
  
  <pre><code>♦
  </code></pre>
  
  <p>But how can I test it? I tried this but it doesn't work:</p>
  
  <pre><code>if (some_string==4){
  
  }
  </code></pre>
  
  <p>Thanks!</p>