function bbp_set_current_user_default_role() {

	/** Sanity ****************************************************************/

	// Bail if deactivating bbPress
	if ( bbp_is_deactivation() ) {
		return;
	}

	// Catch all, to prevent premature user initialization
	if ( ! did_action( 'set_current_user' ) ) {
		return;
	}

	// Bail if not logged in or already a member of this site
	if ( ! is_user_logged_in() ) {
		return;
	}

	// Get the current user ID
	$user_id = bbp_get_current_user_id();

	// Bail if user already has a forums role
	if ( bbp_get_user_role( $user_id ) ) {
		return;
	}

	// Bail if user is marked as spam or is deleted
	if ( bbp_is_user_inactive( $user_id ) ) {
		return;
	}

	/** Ready *****************************************************************/

	// Load up bbPress once
	$bbp         = bbpress();

	// Get whether or not to add a role to the user account
	$add_to_site = bbp_allow_global_access();

	// Get the current user's WordPress role. Set to empty string if none found.
	$user_role   = bbp_get_user_blog_role( $user_id );

	// Get the role map
	$role_map    = bbp_get_user_role_map();

	/** Forum Role ************************************************************/

	// Use a mapped role or default role
	$new_role = empty( $user_role ) || ! isset( $role_map[ $user_role ] )
		? bbp_get_default_role()
		: $role_map[ $user_role ];

	/** Add or Map ************************************************************/

	// Add the user to the site
	if ( true === $add_to_site ) {
		bbp_set_user_role( $user_id, $new_role );

	// Don't add the user, but still give them the correct caps dynamically
	} else {
		$bbp->current_user->caps[ $new_role ] = true;
		$bbp->current_user->get_role_caps();
	}
}