passing handle objects by value

2021 7 13
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Hi
I have a class inheriting from the "handle" class, which means (correct me if I'm wrong) it will have reference semantics. I use an instance of the class in a simulation loop and I'd like to save a sanpshot of the object in every iteration. Is there a way to dereference the handle object and pass it by value to store it in a cell array?
Thanks for your replies in advance

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Yongjian Feng
Yongjian Feng 2021-7-13

0 个投票

You don't need to.
classdef aclass < handle
properties
a
end
end
l={}
a = aclass();
a.a = 10;
l{end+1} = a;
a = aclass();
a.a = 20;
l{end+1} = a;
l{1}
l{2}

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mahdi Babayi semiromi
编辑：mahdi Babayi semiromi 2021-7-13
Thank you very much for your reply
This is different from the application that I have in mind. my case is like the following:
classdef aClass < handle
properties
a
end
end
aClassInstance = aClass;
l = {};
for i = 1:2
aClassInstance.a = i;
% here I want to save the variable aClassInstance by value, so that I
% have it in its current state. If I just assign it to a cell array,
% like:
l{end+1} = aClassInstance;
% then l{end+1} will only hold a pointer to the variable aClassInstance
% and when I exit the loop, I'll only have access to the latest state
% of the variable
end
Yongjian Feng
Yongjian Feng 2021-7-13
Can you just move the initialization line inside the for loop?
classdef aClass < handle
properties
a
end
end
l = {};
for i = 1:2
aClassInstance = aClass;
aClassInstance.a = i;
% here I want to save the variable aClassInstance by value, so that I
% have it in its current state. If I just assign it to a cell array,
% like:
l{end+1} = aClassInstance;
% then l{end+1} will only hold a pointer to the variable aClassInstance
% and when I exit the loop, I'll only have access to the latest state
% of the variable
end

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