Use of pointers to structures

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Ricardo
Ricardo 2014-12-9
编辑： Matt J 2014-12-9
Dear all,
I would like to know if it is possible to use pointers to structures. The case I would like to use this time is like this:
% case_tal,case_cual are structs with data from different systems, I want to loop on them
for i_case = [case_tal,case_cual]
% i_case.file is an array of files that I want to loop within each case
for i_file = i_case.file
i_file.data = do_stuff_on_the_data;
end
end
I want to use pointers because I would like that when I do
i_file.data = do_stuff_on_the_data;
the struct really is modified and store the data, not lose it.
Is it possible?
Thanks in advance!

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回答（2 个）

Adam
Adam 2014-12-9
编辑：Adam 2014-12-9
Matlab does not have the concept of pointers.
You can use a class derived from handle to achieve this 'by reference' behaviour instead of a struct, but a struct in Matlab is just a simple object to hang data off and you have to reassign to the struct if you want to change the data.
You can just do:
i_file.data = do_stuff_on_the_data( i_file.data );
though. It's ugly as a programming construct, but it does the job when you can't pass things by reference (or pointer).
Document for reference on classes if you aren't aware of it:
http://www.mathworks.co.uk/help/pdf_doc/matlab/matlab_oop.pdf
Matt J
Matt J 2014-12-9
编辑：Matt J 2014-12-9
The simplest solution would be to simply return i_file as an output from whatever function is performing the code you show. However, to have the semantics you mention, you could create a handle class
classdef myclass<handle
properties
data
end
end
Now, when you create the variable as follows
i_file=myclass;
it will have the behavior you're looking for.

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