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: comment.m
    path of file: ./repos/adinstruments_sdk_matlab/+adi/@comment
    
    the code of the file until where you have to start completion: classdef (Hidden) comment < handle
    %
    %   Class:
    %   adi.comment
    %
    %   Holds a comment.
    %
    %   NOTE: Comments can be moved after they are placed. I think
    %   this means that the comments might not be ordered by ID.
    %
    %   Also comments can be deleted, which might cause gaps in the ID
    %   numbering as well.
    %
    %   See Also
    %   --------
    %   adi.file
    
    properties
        str  %The string content of the comment
        id   %The number associated with the comment, starts at ????
        tick_position %?????????
        %TODO: Add time since start of record and experiment ...
        channel %-1 indicates all channels
        record  %(#, not a pointer)
        tick_dt
        trigger_minus_rec_start %(in seconds)
    end
    
    properties (Dependent)
        time %Time in seconds since the start of the record.
    end
    
    properties (Dependent)
        absolute_time
    end
	properties (Hidden)
        %Populated by the record ...
       record_start_datetime 
    end
    
	methods
        function value = get.absolute_time(obj)
            seconds = obj.tick_positio
    
function exportToHDF5File(objs,fobj,save_path,conversion_options)
            group_name = '/comments';
            h5m.group.create(fobj,'comment_version');
            h5writeatt(save_path,'/comment_version','version',1);
            
            h5m.group.create(fobj,group_name);
            
            %TODO: Rewrite with h5m library
            %TODO: This needs to be fixed
            h5writeatt(save_path,group_name,'str',int16(char({objs.str})));
            
            h5writeatt(save_path,group_name,'id',[objs.id]);
            h5writeatt(save_path,group_name,'tick_position',[objs.tick_position]);
            h5writeatt(save_path,group_name,'channel',[objs.channel]);
            h5writeatt(save_path,group_name,'record',[objs.record]);
            h5writeatt(save_path,group_name,'tick_dt',[objs.tick_dt]);
        end
        function m = exportToMatFile(objs,m,conversion_options)
            
            m.comment_version = 1;
            m.comments = struct(...
                'str',              {objs.str},...
                'id',               {objs.id},...
                'tick_position',    {objs.tick_position},...
                'channel',          {objs.channel},...
                'record',           {objs.record},...
                'tick_dt',          {objs.tick_dt});
            
        end