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: setval.m
    path of file: ./repos/bspm/thirdparty/spm12/matlabbatch/@cfg_item
    
    the code of the file until where you have to start completion: function item = setval(item, val, dflag)

% function item = setval(item, val, dflag)
% set item.val{1} to val. Validity checks are performed through subsasgn.
% If val == {}, set item.val to {}. 
% If dflag is true, and item.def is not empty, set the default setting for
% this item instead by calling feval(item.def{:}, val). If val == {}, use
% the string '<UNDEFINED>' as in a harvested tree. If dflag is true, but
% no item.def defined, set item.val{1} instead.
%
% This code is part of a batch job configuration system for MATLAB. See 
%      help matlabbatch
% for a general overview.
%_______________________________________________________________________
% Copyright (C) 2007 Freiburg Brain Imaging

% Volkmar Glauche
% $Id: setval.m 5678 2013-10-11 14:58:04Z volkmar $

rev = '$Rev: 5678 $'; %#ok

if iscell(val) && isempty(val)
    if dflag

    
function item = setval(item, val, dflag)

% function item = setval(item, val, dflag)
% set item.val{1} to val. Validity checks are performed through subsasgn.
% If val == {}, set item.val to {}. 
% If dflag is true, and item.def is not empty, set the default setting for
% this item instead by calling feval(item.def{:}, val). If val == {}, use
% the string '<UNDEFINED>' as in a harvested tree. If dflag is true, but
% no item.def defined, set item.val{1} instead.
%
% This code is part of a batch job configuration system for MATLAB. See 
%      help matlabbatch
% for a general overview.
%_______________________________________________________________________
% Copyright (C) 2007 Freiburg Brain Imaging

% Volkmar Glauche
% $Id: setval.m 5678 2013-10-11 14:58:04Z volkmar $

rev = '$Rev: 5678 $'; %#ok

if iscell(val) && isempty(val)
    if dflag
        if ~isempty(item.def)
            try
                feval(item.def, {'<UNDEFINED>'});
            catch
                cfg_message('matlabbatch:setval:defaults', ...
                            '%s: unable to set default value.', ...
                            subsasgn_checkstr(item, substruct('.','val')));
            end