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/MatlabGDSPhotonicsToolbox/Functions/GDSII Library/Basic/@gds_structure
    
    the code of the file until where you have to start completion: function gelp = subsref(gstruct, ins);
%function gelp = subsref(gstruct, ins);
%
% subscript reference method for the gds_structure class
%
% gstruct :  a gds_structure object
% ins :      an array index reference structure

    
function gelp = subsref(gstruct, ins);
%function gelp = subsref(gstruct, ins);
%
% subscript reference method for the gds_structure class
%
% gstruct :  a gds_structure object
% ins :      an array index reference structure
% gelp :     a gds_element object or 
%            a cell array of the indexed gds_element objects
%            or a structure property when structure name
%            referencing is used

% Ulf Griesmann, NIST, June 2011

switch ins.type
 
 case '()'
    
    idx = ins.subs{:};
    if ischar(idx) && idx == ':'
       gelp = gstruct.el(1:end