public function __construct( $query = null ) {

		// Store the raw query vars for later access.
		$this->query_vars_raw = $query;

		// Allow extending classes to register action/filter hooks.
		$this->setup_hooks();

		if ( ! empty( $this->query_vars_raw ) ) {
			$this->query_vars = wp_parse_args( $this->query_vars_raw, array(
				'type'                => 'newest',
				'per_page'            => 0,
				'page'                => 1,
				'user_id'             => 0,
				'search_terms'        => false,
				'search_wildcard'     => 'both',
				'include'             => false,
				'exclude'             => false,
				'user_ids'            => false,
				'member_type'         => '',
				'member_type__in'     => '',
				'member_type__not_in' => '',
				'meta_key'            => false,
				'meta_value'          => false,
				'xprofile_query'      => false,
				'populate_extras'     => true,
				'count_total'         => 'count_query'
			) );

			/**
			 * Fires before the construction of the BP_User_Query query.
			 *
			 * @since 1.7.0
			 *
			 * @param BP_User_Query $this Current instance of the BP_User_Query. Passed by reference.
			 */
			do_action_ref_array( 'bp_pre_user_query_construct', array( &$this ) );

			// Get user ids
			// If the user_ids param is present, we skip the query.
			if ( false !== $this->query_vars['user_ids'] ) {
				$this->user_ids = wp_parse_id_list( $this->query_vars['user_ids'] );
			} else {
				$this->prepare_user_ids_query();
				$this->do_user_ids_query();
			}
		}

		// Bail if no user IDs were found.
		if ( empty( $this->user_ids ) ) {
			return;
		}

		// Fetch additional data. First, using WP_User_Query.
		$this->do_wp_user_query();

		// Get BuddyPress specific user data.
		$this->populate_extras();
	}