How can we have an "assert" function in a "matlab.System" class so it executes during code generation?

We have a Simulink model that includes a MATLAB System block, that we would like to generate code for using Simulink Coder. In the "matlab.System" class file, we want to validate that a property, "Port Dimensions" is equal to a certain default value. If it isn't equal, we want the code generation to stop.
How can the "assert" function be included in the "matlab.System" class file, such that it is called during code generation?

Answer 1

[MathWorks Support Team]

The "assert" function can be called using the "validatePropertiesImpl" method of the "matlab.System" class.

This method gets called during the build process, so it can trigger the "assert" function during code generation. To implement it, include this method in the "matlab.System" script, under "methods":

function validatePropertiesImpl(obj)
     % Validate related or interdependent property values
     assert(isequal(obj.PortDimensions,obj.DefaultVal)); 
end

For more information on the "validatePropertiesImpl" method, please refer to this link:

https://uk.mathworks.com/help/releases/R2024a/matlab/ref/matlab.system.validatepropertiesimpl.html