Why objects are losing reference for each other?

Hello.

I'm wrinting a code in using O.O. paradigm and having some problems with references.

I have one classe "Person" that have to be conected with other people (objets of Person)

The problem is that when I navegate deep in the connections, some Person loose it's connection. When I access the object in the "first level" there is the connection. But accessing the same person in a second level, there is no connection anymore.

Here is the code:

classdef Pearson

properties

connections

end

properties(Access = private)

connIndex = 1;

end

methods

function obj = Pearson()

obj.connections = cell(3:1);

end

function obj = addConnection(obj, person)

obj.connections{obj.connIndex} = person;

obj.connIndex = obj.connIndex + 1;

end

end

end

close all; clear; clc;

people = cell(3:1);

%Creating 3 people

for p = 1:3

people{p} = Pearson();

end

%Creating connections between them

people{1} = people{1}.addConnection(people{2});

people{1} = people{1}.addConnection(people{3});

people{2} = people{2}.addConnection(people{1});

people{3} = people{3}.addConnection(people{1});

I'm doing something wrong?

Answer 1

[chrisw23]

try this

classdef Pearson < handle

...

function addConnection(obj, person)
    obj.connections{obj.connIndex} = person;
    obj.connIndex = obj.connIndex + 1;
end

Handle vs Value Class

[Hudson Romualdo]

Thanks @chrisw23.

It worked!