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: subsref.m
    path of file: ./repos/fieldtrip/external/gifti/@gifti
    
    the code of the file until where you have to start completion: function varargout = subsref(this,subs)
% Subscript referencing for GIfTI objects
%__________________________________________________________________________
% Copyright (C) 2008 Wellcome Trust Centre for Neuroimaging

% Guillaume Flandin
% $Id: subsref.m 6345 2015-02-20 12:25:50Z guillaume $


    
function varargout = subsref(this,subs)
% Subscript referencing for GIfTI objects
%__________________________________________________________________________
% Copyright (C) 2008 Wellcome Trust Centre for Neuroimaging

% Guillaume Flandin
% $Id: subsref.m 6345 2015-02-20 12:25:50Z guillaume $

if length(this) > 1 && ~strcmp(subs(1).type,'()')
    warning('Not implemented.');
    for i=1:numel(this)
        varargout{i} = subsref(this(i),subs);
    end