How do I remove a dynamic property from a class?

I have a class "A" that has a property called "Sigs" of class "B". Class "B" inherits from "dynamicprops" and the constructor for "A" populates "Sigs" with a bunch of dynamic properties that are of class "C". I want to be able to delete those properties from "Sigs". How do I do that?

Answer 1

[MathWorks Support Team]

In order to remove a dynamic property, save the "meta.DynamicProperty" object that is returned by "addprop" and then use the "delete" function of that object.

https://www.mathworks.com/help/matlab/ref/dynamicprops.addprop.html#bu2k9r3-9

In order to save the "meta.DynamicProperty" objects, create a struct "sig_meta" that maps from the property name to the "meta.DynamicProperty" object. This was a property of the "A" class.

If you want to hide the "sig_meta" from the property list of your "A" class, use "Hidden=true". This allows you to still use the property, but it will not clutter your Command Window outputs.

https://www.mathworks.com/help/matlab/matlab_oop/property-attributes.html#brjjwcj-1

Finally, in order to delete the dynamic property, use "delete" on the field of the struct "sig_meta" in your "A" class. Then, call "rmfield" to keep the struct and the "B" class properties in sync.

https://www.mathworks.com/help/matlab/ref/rmfield.html

An example is attached.

To play with this example, execute

>> obj = A;
>> obj.Sigs
>> obj.sig_meta
>> delete(obj.sig_meta.prop10);
>> obj.Sigs
>> obj.sig_meta
>> obj.sig_meta = rmfield(obj.sig_meta,'prop10')
>> obj.sig_meta;