Hey everyone,
I'm trying to implement some property validation function for a class as follows
classdef test
properties
Str {mustBeString(Str)}
end
methods
function obj = test(str)
obj.Str = str;
end
end
end
function mustBeString(str)
if ~isstring(str) && ~ischar(str)
error('Parameter:wrongType',...
'Description must be string.');
end
end
But here's the problem. It doesn't matter which value or type Str has, because matlab seems to assign an empty value for this property even before the constructor is evaluated. In fact I checked in debugging mode and it seems that the validation function is called before the constructor.
I also tried to execute a modified example from the matlab documentation
classdef ImData
properties
Data {mustBeNumeric, mustBeInRange(Data,[0,255])}
end
methods
function obj = ImData(dat)
obj.Data = dat;
end
end
end
function mustBeInRange(a,b)
if any(a(:) < b(1)) || any(a(:) > b(2))
error(['Value assigned to Data property is not in range ',...
num2str(b(1)),'...',num2str(b(2))])
end
end
In this case everything worked fine.
Anyone who might have an idea, how to fix this issue?
Thank you very much.
