You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: progress.m
    path of file: ./repos/MatlabProgressBar
    
    the code of the file until where you have to start completion: classdef progress < handle
    %PROGRESS Wrapper class to provide an iterator object for loop creation
    % -------------------------------------------------------------------------
    % This class prov
    
function delete(obj)
            % call the destructor of the ProgressBar() object
            if ~isempty(obj.ProgressBar)
                obj.ProgressBar.release();
            end
        end
        
        function [varargout] = subsref(obj, S)
            % This method implements the subsref method and only calls the update()
            % method of ProgressBar. The actual input 'S' is passed to the default
            % subsref method of the class of obj.IterationList.
            
            obj.ProgressBar.step([], [], []);
            varargout = {subsref(obj.IterationList, S)};
        end