MATLAB构造函数/无对象的接口类

Question

is there a way in MATLAB to construct some kind of an use-interface-class or something, that does not output an own object? I have something like this in mind:

object1_from_class_main = constructor_class_A()
object2_from_class_main = constructor_class_B()
object3_from_class_main = constructor_class_C()

with class_A / class_B / class_C inherit from class_main . This means there should exist a main_class that handles all user input, and inside of this class, all other subclasses are constructed/maintained.

I dont know if there is a big mistake in this, but would appreciate, if you have any suggestions.

Answer 1

By design, the constructor must return an object of the class that the constructor belongs to or the output should be unassigned . It cannot return an object of a different class. From the documentation .

The only output argument from a constructor is the object constructed. If you do not want to assign the output argument, you can clear the object variable in the constructor.

You could define a static method for classA , classB , etc. that returns an object of class Main

classdef ClassA < handle
    methods (Static)
        function mainobj = create_main()
            % Construct Main object and do whatever you need to here
            mainobj = Main();
        end
    end
end

class_of_main = ClassA.create_main();

Alternately, you could make your Main instance a property of your classes

classdef ClassA < handle

    properties
        mainobj
    end

    methods
        function self = ClassA()
            self.mainobj = Main()
        end
    end
end

A better question though is why you need to do this.

Update

Based on your clarification, you want basically a controller to keep track of all of the Furniture objects that you create. You can do this with a class which keeps track of Furniture objects

classdef FurnitureController < handle
    properties
        furnitures = furniture.empty()
    end

    methods
        function addFurniture(self, furniture)
            self.furnitures = [self.furnitures, furniture];
        end
    end
end

classdef Furniture < handle
end

classdef Chair < Furniture
end

classdef Desk < Furniture
end

controller = FurnitureController()
controller.addFurniture(Desk())
controller.addFurniture(Chair())