title: In R, how can I see the signatures for which a generic method is implemented?
body: <p>Is there a function in R that finds all implemented signatures for a given generic function? </p>
  
  <p>I am looking for something like: </p>
  
  <pre><code>findSignatures("myFunction")
  </code></pre>
  
  <blockquote>
    <p>[1] "character"</p>
  </blockquote>