Question

I would like to define an interface with properties in an abstract class like this

classdef A
    properties (Abstract = true)
        Valid;
    end
end

with an implementation of this interface like this

classdef B < A
    properties (Dependent = true)
        Valid;
    end
    methods
        function v = get.Valid(obj)
            v = 1;
        end
    end
end

but when I try to make an instance of B I get the following error

>> c = B()
??? Error using ==> B
The property 'Valid' restriction defined in class 'B' must match the property definition in base class 'B'.

Can anyone tell me what I doing wrong?

Answer 1

Try setting the Dependent property attribute in the base class as well:

classdef A
    properties (Abstract = true, Dependent = true)
        Valid;
    end
end

According to the documentation:

Concrete subclasses must redefine abstract properties without the
Abstract attribute set to true

The way I understood this, subclass property attributes must match the base class (without the Abstract property)