Hide the BuddyPress admin bar from logged-out visitors

// BuddyPress shows the toolbar to everyone; WordPress does not. Priority 100
// so this runs after BuddyPress has had its say.
add_filter('show_admin_bar', 'shop_bar_for_members_only', 100);

function shop_bar_for_members_only($show) {
    return is_user_logged_in() ? $show : false;
}