Saving with handle objects

Jason Climer

2019 5 17

0 个回答

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I'm trying to create some handle classes that are nested together in a struct - something like this:

classdef A < handle
    properties
        parent
        data
    end
    
    methods
        function obj = Data(parent,raw_data)
           obj.parent = parent;
           obj.raw_data = raw_data;
        end
    end
    
    methods (Abstract)
        out = get(obj)
    end
end

Instances of A are compiled in another handle class:

classdef B < handle
    properties
        data = struct;
        epoch = [0 inf];
    end
    
    methods
        function load_C(obj,field_name,varargin)
            obj.data.(field_name) = C(obj,varargin{:});% C is an instance of an A class
        end
    
        function out = get(obj,field_name)
            out = obj.data.(field_name).get();
        end
    end
end

When I try to save such objects, the struct data looses all of its fields! This is particularly wierd to me because in other classes I've made where the handle objects are not stored in a struct and are just properties of the class, they are saved.

3 个评论
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Jason Climer 2019-5-17

在 MATLAB Online 中打开

Here's the ugly workaround:

classdef B < Handle
    
properties
    data = struct;
    fields = {};
    data_obs = {};
end
    
methods
    function b = saveobj(obj)
            obj.fields = fields(obj.data);
            obj.data_obs = cellfun(@(x)obj.data.(x),obj.fields,'UniformOutput',false);
            b = obj;
    end
end
methods (Static)
    function b = loadobj(a)           
           for j=find(~ismember(a.fields,fields(a.data)))'
               a.data.(a.fields{j}) = a.data_obs{j};
           end
           b = a;
     end 
end

Steven Lord 2019-5-17

Can you show us the code you use to construct the object that you're trying to save as well as the actual save call you're executing? Having a complete end-to-end example will help us investigate what's happening.

In addition, one of the comments in your code is:

% C is an instance of an A class

Can you show us the definition of the C class or the C function?

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