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: plus.m
    path of file: ./repos/chebfun/@chebfun2v
    
    the code of the file until where you have to start completion: function F = plus( F, G ) 
% + PLUS of two CHEBFUN2V objects. 
%   F + G if F and G are CHEBFUN2V objects does componentwise addition. 
%
%   F + G if F is a double and G is a CHEBFUN2V does componentwise addition. 
% 
%   F + G if F is a CHEBFUN2V and G is a double does componentwise addition.
% 

    
function F = plus( F, G ) 
% + PLUS of two CHEBFUN2V objects. 
%   F + G if F and G are CHEBFUN2V objects does componentwise addition. 
%
%   F + G if F is a double and G is a CHEBFUN2V does componentwise addition. 
% 
%   F + G if F is a CHEBFUN2V and G is a double does componentwise addition.
% 
%   PLUS(F,G) is called for the syntax F + G. 

% Copyright 2017 by The University of Oxford and The Chebfun Developers.
% See http://www.chebfun.org/ for Chebfun information. 

% Empty check: 
if ( isempty( F ) || isempty( G ) ) 
    F = chebfun2v; 
    return
end