Change struct property values in a class

Olf
2014 10 28
2 个回答
回答已采纳
更新时间：2014 11 6
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1 个投票

Hi, I have a problem with using a struct as property of a value class. It seems I cannot change the values of fields (or add new fields).
The simplest example is as follows:
classdef testclass
properties
struct_prop=struct;
end
methods
function obj = change_struct_prop(obj, val)
obj.struct_prop.field1 = val;
end
end
end
Trying to change the struct_prop doesn't work:
>> a=testclass;
>> a.change_struct_prop(2);
>> a.struct_prop
ans =
field1: []
>>
Is there any way to manipulate a class property that is a struct (without having to define a separate class for it)? Defining the struct_prop fields in the initialisation function didn't help either.
Thanks a lot,
Olf

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 采纳的回答

per isakson
per isakson 2014-10-28
编辑：per isakson 2014-10-29

1 个投票

Replace
classdef testclass
by
classdef testclass < handle
and search the help for "Comparing Handle and Value Classes"
&nbsp
In response to the comment
If a value class, replace
>> a.change_struct_prop(2);
by
>> a = a.change_struct_prop(2);
and read the help on the comparison of value and handle classes

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Olf
Olf 2014-10-28
I tried handle classes before, however I want to create an array of my class which I iteratively define by copying the (n-1)th element to the (n)th element and apply changes to that. If the class is a handle class, all instances will be identical which is not desired. Any way to get around this?
per isakson
per isakson 2014-10-28
See addition to answer

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更多回答（1 个）

Olf
Olf 2014-11-6

1 个投票

I found a solution that seems to have solved the issue. Instead of inheriting from the handle class I let it inherit from matlab.mixin.Copyable This gives the features from the handle class and also comes with a copy method.
classdef testclass < matlab.mixin.Copyable ...

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