Source Reference:

• Component: bbPress :: bbp-forum

  File: /bbp-includes/bbp-forum-template.php :: Trac Source Line: 1517

   * @uses bbp_is_forum_private()
   * @uses current_user_can()
   *
   * @return string
   */
  function bbp_suppress_private_forum_meta( $retval, $forum_id ) {
  	if ( bbp_is_forum_private( $forum_id, false ) && !current_user_can( 'read_private_forums' ) )
  		$retval = '-';
  
  	return apply_filters( 'bbp_suppress_private_forum_meta', $retval );
  }
  
  /**
   * Replace forum author details for users that cannot view them.
   *
   * @since bbPress (r3162)
   *
   * @param string $retval
   * @param int $forum_id
   *