can setProperties work with save and load?

1 次查看（过去 30 天）

显示更早的评论

Edward B 2019-12-17

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/497113-can-setproperties-work-with-save-and-load

关闭： MATLAB Answer Bot 2021-8-20

在 MATLAB Online 中打开

Any class that is derived from < matlab.System has a problem with required and optional arguments

To illustrate, if you save the class VarArgClass below and run the line above it, it generates the message when loaded.

Apparently, when loading such objects after a save, MATLAB for soem reason creates a temporary instance of the object. However, MATAB apparently neglects to supply the required arguments to the constructor. So without the "try...catch" workaround below, you get an error on load.

Can this be fixed? Or is there a better workaround?

clear; obj = VarArgClass(1, 'propOptional', 2); save; load;
classdef VarArgClass < matlab.System
    
    properties
        propRequired
        propOptional
    end
    
    methods
        function self = VarArgClass(propRequired, varargin)
            setProperties(self, length(varargin), varargin{:});
            try
                self.propRequired = propRequired;  % required prop not supplied on load
            catch
                disp('This should only appear in a load');
            end
        end
        
    end
end