bp_get_the_thread_message_id()

	function bp_get_the_thread_message_id() {
		global $thread_template;

		$thread_message_id = isset( $thread_template->message->id )
			? (int) $thread_template->message->id
			: null;

		/**
		 * Filters the ID of the current message in the thread.
		 *
		 * @since BuddyPress 1.9.0
		 *
		 * @param int $thread_message_id ID of the current message in the thread.
		 */
		return apply_filters( 'bp_get_the_thread_message_id', $thread_message_id );
	}