function bbp_get_topic_class( $topic_id = 0, $classes = array() ) {
		$bbp       = bbpress();
		$topic_id  = bbp_get_topic_id( $topic_id );
		$forum_id  = bbp_get_topic_forum_id( $topic_id );
		$author_id = bbp_get_topic_author_id( $topic_id );
		$classes   = array_filter( (array) $classes );
		$count     = isset( $bbp->topic_query->current_post )
			? (int) $bbp->topic_query->current_post
			: 1;

		//  Stripes
		$even_odd = ( $count % 2 )
			? 'even'
			: 'odd';

		// Forum moderator replied to topic
		$forum_moderator = ( bbp_is_user_forum_moderator( $author_id, $forum_id ) === $author_id )
			? 'forum-mod'
			: '';

		// Is this topic a sticky?
		$sticky = bbp_is_topic_sticky( $topic_id, false )
			? 'sticky'
			: '';

		// Is this topic a super-sticky?
		$super_sticky = bbp_is_topic_super_sticky( $topic_id  )
			? 'super-sticky'
			: '';

		// Get topic classes
		$topic_classes = array(
			'loop-item-'        . $count,
			'user-id-'          . $author_id,
			'bbp-parent-forum-' . $forum_id,
			$even_odd,
			$forum_moderator,
			$sticky,
			$super_sticky
		);

		// Run the topic classes through the post-class filters, which also
		// handles the escaping of each individual class.
		$post_classes = get_post_class( array_merge( $classes, $topic_classes ), $topic_id );

		// Filter
		$new_classes  = apply_filters( 'bbp_get_topic_class', $post_classes, $topic_id, $classes );

		// Return
		return 'class="' . implode( ' ', $new_classes ) . '"';
	}