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: setStore.m
    path of file: ./repos/lrslibrary/libs/manopt/manopt/privatetools
    
    the code of the file until where you have to start completion: function storedb = setStore(problem, x, storedb, store)
% Updates the store struct. pertaining to a point in the storedb database.
%
% function storedb = setStore(problem, x, storedb, store)
%
% Updates the storedb database of structures such that the structure
% corresponding to the point x will be replaced by store. If there was no
% record for the point x, it is created and set to store. The updated
% storedb database is returned. The lastset__ field of the store structure
% keeps track of which stores were updated latest.

% This file is part of Manopt: www.manopt.org.
% Original author: Nicolas Boumal, Dec. 30, 2012.
% Contributors: 
% Change log: 

    
function storedb = setStore(problem, x, storedb, store)
% Updates the store struct. pertaining to a point in the storedb database.
%
% function storedb = setStore(problem, x, storedb, store)
%
% Updates the storedb database of structures such that the structure
% corresponding to the point x will be replaced by store. If there was no
% record for the point x, it is created and set to store. The updated
% storedb database is returned. The lastset__ field of the store structure
% keeps track of which stores were updated latest.

% This file is part of Manopt: www.manopt.org.
% Original author: Nicolas Boumal, Dec. 30, 2012.
% Contributors: 
% Change log: 
%   Dec. 6, 2013, NB:
%       Now using a persistent uint32 counter instead of cputime to track
%       the most recently modified stores.

    % This persistent counter is used to keep track of the order in which
    % store structures are updated. This is used by purgeStoredb to erase
    % the least recently useful store structures first when garbage
    % collecting.
    persistent counter;
    if isempty(counter)
        counter = uint32(0);
    end