Recursive data structure error in mex compiling of object-oriented program

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Chris Wolf
Chris Wolf on 4 Mar 2016
Edited: Dominik Müller on 10 Nov 2020
I am attempting to use Matlab Coder to build a mex function. The function itself is the front end for an object oriented program. I'm getting a compiling error and can reproduce it with a simple toy example.
The following example compiles and executes without errors. It consists of three files: the main function, an example parent class, and an example child class:
function str = main
M = ParentClass;
str = 'Done';
end
...
classdef ParentClass < handle
properties
Child;
end
methods
function self = ParentClass
self.Child = ChildClass;
end
end
end
...
classdef ChildClass < handle
properties
end
methods
function self = ChildClass
end
end
end
I'd like the child to keep a reference to its parent as a property, which is key for many design patterns. However, this causes a compiling error. I implement it by modifying the two classdefs as shown below. When the parent creates the child, the child stores the parent during the constructor.
classdef ParentClass < handle
properties
Child;
end
methods
function self = ParentClass
self.Child = ChildClass(self); % Line with the compiling error
end
end
end
...
classdef ChildClass < handle
properties
Parent
end
methods
function self = ChildClass(Parent)
self.Parent = Parent;
end
end
end
This produces the coder compiling error "This expression and its property 'Parent.Child' have the same class. Code generation does not support recursive data structures."
Is there a simple way around this language limitation? It works fine in the regular matlab environment, and this behavior is supported in other languages.
edit: Essentially, I'm looking for a way for the Child and Parent to have a reference to each other that is compatible with Matlab Coder.
Thanks in advance for the help
  1 Comment
Dominik Müller
Dominik Müller on 9 Nov 2020
Hi,
I know the question is already sth like 4 years old but is there an answer on this topic? I'm stuck to the same problem right now.

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Answers (1)

Darshan Ramakant Bhat
Darshan Ramakant Bhat on 10 Nov 2020
Unfortunately MATLAB Coder does not support recursive data structures yet. It is documented in the below page :
We have made an internal request to support this in one of the future releases.

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